I thought I knew how to center drill, and then I saw this. Learning something new everyday!

Thanks for your time Tom. I'm a newbie and appreciate a pro doing back to basic videos like these!

EVERYONE WATCHING MR T: FYI Be sure to sit through the commercials. Much as I am tempeted to "skip the ad" you skip Mr T's chance to pick up a small amout for sharing his tremendous expertise!!! Mr T: Really liked the tip about the extended center drilling. You earned "One ATTABOY" Thanks!

@Zios0000

5 жыл бұрын

hey man how is that machine called?

Wow, great video. What a helpful point, I never thought about leaving the stub shaft out of the chuck to get the true center. Thank you for sharing the idea.

I never realized extending the part before center drilling would make a difference but you're right! Makes sense ....

@TomsTechniques

7 жыл бұрын

Just one of those things I realized through all the years of turning parts. Tom

Thanks for the Vid Tom. Useful as always. I built my drawbar for my mill and due to spindle size I had to leave the piece hanging far out of the chuck when I center drilled. I was told by numerous people this was wrong, but in fact what you showed indicates I got lucky and actually did it right.

@TomsTechniques

10 жыл бұрын

Steve, The method in the video only applies if you plan to turn down the stock, the idea being to not introduce any stresses in the part before it is machined. If you are just adding a feature such as a thread to the end of an existing shaft then the shaft should be center drilled close to the chuck to maintain concentricity. There is an exception to every rule. :) Tom

Thanks Tom, thanks for even highlighting the effects of centering when the work piece is more inside the chuck

Thanks Tom, as always to the point and informative. Keep the videos coming they are great for my new obsession.

@TomsTechniques

8 жыл бұрын

+whitecaps775 Obsessions are good if they involve machining!

Tom, Thanks for taking the time to show the "basics" Much appreciated by a" wanna be machinist"

@TomsTechniques

10 жыл бұрын

You are welcome Ed.

Thanks for all your great videos. You have great tips and knowledge.

@TomsTechniques

10 жыл бұрын

Thanks for watching!

A good short video on the types of center drills and center drilling operation on the lathe. The instructor explains some valuable key points. Lathes and milling machines are used in many areas of manufacturing as essential basic tools, including woodworking, ceramic parts manufacturing, metal and metal alloys shaping and manufacturing, plastics and elastomers machining.....etc. Therefore, anyone interested in manufacturing technologies for fun, hobby, as an entrepreneur or for their career should definitely familiarize himself/herself with lathe and milling machine basics and probably also with other non-conventional techniques such as laser machining, plasma machining, waterjet.....etc. Even if you are not a machinist, but a consumer of machined parts, I strongly recommend learning the basics of machining operations and CNC and manual equipment, so that when you prepare blueprints or want a product to be designed and want to place orders for parts, you know better what is possible and what is not possible. Also, the equipment a machine shop uses is an important contributor to quality, lead time and price. Knowing something about your supplier's equipment inventory can give you an idea about whether that particular supplier is a good fit for your specific parts or not, provided you understand something about available equipment. You can visit our KZread channel by clicking our logo on the left for additional videos on various manufacturing techniques, good instructional and educative subscriptions and to see videos we liked. Thank you Tom for posting this instructive video on center drills and center drilling.

I learned a trick years ago about a shaft that has been center drilled close to the chuck and then for some reason, you have to pull the part way out and the center hole is wobbling, you place the outer end in a steady rest and take a small lathe bit and go inside the center drill hole and "peel the center" to true it up. Another thing I do when center drilling is to slightly tighten the tail stock ram as I am advancing the center drill towards the part so it doesn't want to "orbit" or dance around the true center of the work. On a new lathe this is not a problem, but with old well used tail stocks , they can get fairly loose. It's a good idea to put a little drag on the ram. By the way sir, very good video.

@TomsTechniques

5 жыл бұрын

Thanks for watching

Thanks Tom, Great video series your putting out there, your web site is excellent! Thank you again for sharing your wealth of knowledge, and experience! Ray C.

@TomsTechniques

10 жыл бұрын

Thanks Ray!

Hi Tom, the curved edge centre drill is for supporting the work while taper turning using the offset tail stock technique, or so the manufacturers claimed way back when. The Slocombe (centre) drill that cuts a recessed centre is for making a protected centre, so that an item can still be re-centred even after some use where it might have been subject to damage. Both of these uses are a bit rare these days, but useful to know about all the same. I do applaud your efforts to pass on your knowledge and skills.

@TomsTechniques

10 жыл бұрын

Thanks Chris, did I forget to mention that? I'll go back and add a note to the video. Tom

I learned a little about the various kinds of center drills. Also that you think it's OK to use a center drill for spotting drill hole locations, although for that purpose it is best to drill only far enough for the tapered hole to be larger than the web of the drill. On HSM there was a discussion where some insist on using only spotting drills. It depends on the angle of the drill tip vs that of the center drill (60 deg). Might make a good video. I also learned to grind the tip of my center punch more like 90 degrees. As for drilling the center on a long piece held in the chuck, perhaps that is valid for a precision 6 jaw chuck or collet that grips perfectly, but for a 3-jaw chuck I would try to center the end before tightening the jaws, as the runout may just be due to jaw alignment. Thanks for the very clear and detailed video.

Nice tip about center drilling and the use of the tailstock center. Thanks

@TomsTechniques

7 жыл бұрын

Thanks for watching

Thanks for that tip on the part in or extended out. It explains a few of my botch jobs.

@TomsTechniques

7 жыл бұрын

Thanks for watching, David.

Great video. Just some thoughts and experiences I have on center drilling and facing shafts and then moving them out of the chuck to allow machining along the shaft. What you say is correct about the part running out but if you only grip the material by a short section of the end, in the extremities of the chuck jaws it will allow the center drilled end to be moved on center and run true. This will also improve the rigidity of the set up because the supported length of material is shorter. This is caused by the chuck jaws on any chuck not being parallel and gripping on the inside end of the jaw [bell mouth]. To eliminate this problem on jobs with the material protruding into the lathe spindle use aluminium packers under the chuck jaws to shorten the grip length of the jaw.

Heh something worthwhile to watch tonight after such a hectic day. Now I know which center bits to order thanks. Everyone else is passed out from eating too much I was too and decided to spend some time on the net and was alerted to this how cool.

@TomsTechniques

10 жыл бұрын

Hope you've recovered from your eating frenzy and I'm glad you enjoyed the video. Tom

Thanks Tom. As usual a good explanation to go with the video. I'm thinking on the extended wobbling stock the counter drill will act as a boring bar and the finished hole will be larger than the pilot drill. However the center of it will be centered just a larger dia. And the tapered end stock will still fit and hold it true for cutting. Naturally you will have to remove more stock from the OD to clean it up, to have a perfectly cylindrical part. These little things such as bent stock are the ones that bite you and spoil the finished product, good fix for that

@TomsTechniques

10 жыл бұрын

If the part is wobbling, the center drill will be just be slightly off center (on the center of rotation), not larger. The only time it would tend to act as a boring bar would be if you tried to correct the center drill location by extending the stock and re-drilling it. Thanks for watching. Tom

Love your videos. Thank you so much.

@TomsTechniques

9 жыл бұрын

Thanks for watching!

Another great vid! Thanks......

Great tips, no BS, thank you

@TomsTechniques

7 жыл бұрын

Thanks for watching, Mike

Learned something new. Thanks

Great advice, especially with bent part.

sweet, im eventualy looking to simple line bore equipment. i think i might need to learn a lot about tooling . Thank you

Learned something here ! Thanks.

@TomsTechniques

8 жыл бұрын

+S Vp That's good to hear. Thanks for watching!

My name is Erin I just learned how to do this on my dad's lathe on Sunday I'm super excited about learning more about lathes and maching

@TomsTechniques

6 жыл бұрын

Machining is fascinating stuff. It's goof to hear you are enjoying it. Be safe! Tom

Thanks for your valuable expertise

That was a really helpful video, thanks

@TomsTechniques

9 жыл бұрын

Thanks for watching.

Your the best!

Thanks for the clarification. I don't see them listed in my catalogs.

Thank You, very helpful 😇🙏

thats an awesome piece of info lost on many tradesman and mechanical engineers, good advice i have trouble getting apprentice to understand these things, its good to see you hint at the importance of setting things up en situ, a video on machining between centres would be an awesome one or using fixed and travelling steadys awesome video thanks for uploading

@TomsTechniques

10 жыл бұрын

I do plan on doing a video on turning between centers as well as on on the use of steady rests. There is no shortage of material to cover. Thanks for watching. Tom

That's a good point. To centre out from the chuck if turning out that far. Thanks. I most likely would have made the mistake over and over without it dawning on me to do just what you said.

@TomsTechniques

9 жыл бұрын

Thanks Tom. I'm sure I've made plenty of parts that had some taper on them because of this before the light came on. Thanks for watching. Tom

I'm having some what of an issue with the last part (supporting with a chuck and center). Wouldn't it be better to straighten the work piece so it won't rotate "off center" like that? Drilling center in both ends of the work piece when held as close into the chuck as possible, to me, seems like the best way to achieve a truly unified center... I mean, if you extend the work piece like you say and only then drill the center, the drilled center isn't really on center... I really appreciate it, Tom. You're awesome and I learn a lot from you! :)

@TomsTechniques

10 жыл бұрын

The best way to ensure that a part is concentric with the centers is to center drill each end as in the video and turn it betwteen centers. Center drilling with the stock extended from the chuck only applies if the part is to be finished and parted off while held in the chuck. I probably could have made that clearer in the video. Straightening the part might be appropriate if there wasn't enough stock to clean up the run-out. Tom

Great video, !!

@TomsTechniques

10 жыл бұрын

Glad you enjoyed it.

Ill have to remember that about center drilling w part stuck out, def learned something there. Now my question is (sorry if its dumb but im all self taught) is i notice when you face you go from center going out. Is this just a preference or is this something i should start doing now. Thank you

Thanks for the share, I am smarter now.

Brilliant!

@TomsTechniques

10 жыл бұрын

Thanks

That last piece of knowledge explained SOOO much on how and why with many of my parts . Thanking you 🙏🏻 kind sir .

Happy Thanksgiving Tom!

@TomsTechniques

10 жыл бұрын

Thanks David, and to you. Tom

Tom, If you're just putting a center in a part and not using a live center (ie.. going to drill afterwards) - is it acceptable to just use a spotting drill ? I have been using the 120 degree spotting drills (for my 118 degree drills) and it just seems faster and less chance of breaking of the little pips of the center drills. I use these spot drills in the mill as well for the same reason. When installing a live center, I use the center drills. What's your advice?

@TomsTechniques

10 жыл бұрын

Glenn, Center drills work fine for spotting. That's what I was talking about using the long center drills on the mill. You don't have to worry about breaking the pilot off because you just spot with the point. Tom

The wobble and stresses when extending the stock after center drilling comes from tightening the chuck around a significant length of stock and then forcing the center into the hole that now has runout. I usually avoid that by only using the very tip of the chuck jaws. I only tighten the chuck very loosely until the center is in place, and after tightening the chuck I retract the center to check that there is no movement when the center goes in and out. This way, the chuck acts almost like a center - it's not able to bend the stock significantly, only rotate it. My lathe is old and worn, and my 3-jaw chuck has a lot of runout so I almost exclusively use the independent 4-jaw and indicate everything.

@chrisn3794

7 жыл бұрын

You need to true your chuck up with a tool post grinder

Thanks Tom, regards, Matthew

Much thanks Tom,i have a project on this in College :)

@TomsTechniques

7 жыл бұрын

Thanks for watching

Thank you! I have been having difficulty maintaining true center when milling a tight-tolerance part on a mill. I see now why the problem exists, the center drill is not going deep enough.

Ok. I've watched this video a couple of times and I would like to ask a question. It occurs to me that out of round or wild run out pieces still offer a turning center somewhere on the face. If the extended end is wobbling a lot, run out of lets say 8mm (0.315") as a poor casting might (or even a bent piece of round stock) would there not still be a perfectly quiet place on the face - the center - into which the center drill would enter just as it would on a piece running true? Thus the boring bar effect mention by H H would not occur. Is this correct? Great videos. Great!

@TomsTechniques

10 жыл бұрын

Jim, You are correct. The center drill will fall wherever the center of rotation happens to be. Like I mentioned to HH, the only time the drill would try to bore is if you tried to re-drill a hole that was drilled in another set-up and is no longer on the center of rotation. Tom

Happy Thanksgiving Tom. I look forward to your videos, and your site is very well laid out. Question about center drills/drilling; if you are using something other than a 118 degree bit (say a 135 degree split point), will it work as well? I have not seen a center drill other than the 60 degree angle. rd2012

@TomsTechniques

10 жыл бұрын

Thanks Ross. Center drills only come in 60º angles and don't have split points, they rely on the stiffness of the drill to stay on center. If you want to drill a hole that is absolutely on location, it needs to be spotted with a center drill first, even if the drill has a split point. Tom

Can you center drill both ends with the part close in if planning to use a lathe dog and driving plate?

@TomsTechniques

7 жыл бұрын

Absolutely. I only extend a piece of stock to be center drilled if the extended end is to be supported by a center. Tom

Tom when you center drill do you use the power feed option or do you turn it by hand?

@easyboy1950

6 жыл бұрын

No Erin.

Thank you

Nice demonstration 👌

@TomsTechniques

6 жыл бұрын

Thanks

Thanks bro

thanks for uploading this i'm a machining student and this is very good study for me

@TomsTechniques

9 жыл бұрын

It's always good to see these operations in action when you are trying to learn them.

@helmsplitter0233

9 жыл бұрын

Toms Techniques that it is. now if only somebody could make a good CNC simulator so i can work on the programming half of the course haha

Hi Tom great video, just one question when facing that close to the chuck, wont the faced surface be perpendicular to the un machined OD,( the bend or run out) instead of the true turned surface? is it best to face close to the chuck, drill centre with part extended, turn the OD true then face again with the part close to the chuck, to get it pretty perpendicular? thanks again for the great videos

@TomsTechniques

10 жыл бұрын

If you want or need absolute perpendicularity, then finish face to length after the part is turned, In many cases you would want to do that anyway to remove the centers.

I was doing it wrong thanks for setting me straight

@TomsTechniques

10 жыл бұрын

NP

Understood; and a well explained video. As always, thanks’ for taking the time to make this video! And I support this site. ~M~ Newbie PS: this may be my “tagline” until I have a question?

@TomsTechniques

10 жыл бұрын

Thanks Mike. Surely I haven't explained it all that well. There must be a question in there somewhere! ;) Just so you know, I consider ALL questions worthwhile and do my best to answer them. Tom

If the tailstock is somewhat misaligned with the headstock, does the center-drill still do its job? Thanks.

@TomsTechniques

7 жыл бұрын

Yes, to a point. If the tailstock is offset, the center drill will act as a boring bar, generating a hole on center, but slightly larger. It's best to keep the tailstock centered though. Tom

The best way would be to use a steady rest and Dti :) and then dial it in ??Or buy straight stock..So many correct things to do before getting to the start of center drilling making sure your stock you need is accurate, this can easily be ruled out by placing the stock between 2 centers and running a DTI across it length if its a massive run out send it back to your supplier..

What kind of lathe is that? And is that a 6-jaw chuck? How do you like that? Are they independent? Man I wish there was more opportunity for machining in engineering. I miss working on machines....

What would happen if you center drilled near the chuck, then pulled the stock out as you did to run on a center, BUT, first seated the end on the center with a loose chuck, holding it there, THEN tightened the chuck?

@TomsTechniques

5 жыл бұрын

If the stock is irregular, it will distort when clamped regardless of whether the end is held or not. The best option with irregular stock, such as hot rolled, is to turn it between centers and not use the chuck to hold it.

hi guys, i understand exactly what's the point to extend the bar and center drill when extended but nobody says how much could we extend it safely? if for example i have to center drill a shaft of 20cm obviously i can't center drill it fully extended..... in this case what is the best option to avoid the center wobbling? will be correct to center drill near the chuck and then limit the chuck jaws clamping surface trying to align the stock with rubber mallet? thanks for your opinions!!!!

@TomsTechniques

3 жыл бұрын

The amount of shaft extending from the chuck depends on its diameter and is pretty much self limiting. Too much extension, or too long a part between centers will cause chatter. You can still machine long, slender shafts, but that may require a steady or follower rest to be successful.

Hello Tom, Thanks for your demonstration with long material. So if I understand well your recommendation is to do drilling when part is extended from chuck. But what about deep holes (e.g. 10 centimeters) wouldn't be out of centre as close we will be to chuck? Thanks Zdenek

@TomsTechniques

3 жыл бұрын

Only if you plan on turning a part with one end supported the chuck. If you plan to turn the part between centers, centerdrill each end with the part chucked close.

@zdenekzouzazaza2100

3 жыл бұрын

@@TomsTechniques Ok, thanks

Any ideas how to avoid runout with stock that's too short to reach a center? I was trying to true up some 5 inch bar on a Myford and the carriage was fouling on the tailstock - couldn't get the cutter all the way to the end.

@TomsTechniques

10 жыл бұрын

Turning between centers has its limitations. As you have found, it doesn't work well on short parts. One option is to turn from one end as far as possible and then switch the part end for end to do the other end, although that may leave a mark where the cuts overlap. A better option is to just start with longer stock chucked and supported with a center on one end. Then you can turn as much as you need and part it off. Tom

@JMUDoc

10 жыл бұрын

Toms Techniques I ended up trying the former way: leave an inch poking out at a time and size it before sliding some more out. I was going for a sliding fit into some tubes, so the "steps" between the cuts didn't matter too much - a scotch pad got everything level to the touch:). Besides, the material was quite "gooey", and didn't seem to WANT to hold an edge!

@chrisn3794

7 жыл бұрын

Lol 3 years later but you can make a long cap to press over the end of the part and center drill the end of the camp

Are the RPM's the same for a center drill as the twist drill of equal size and material?

@TomsTechniques

8 жыл бұрын

+W.Co.VIDS Yes, the same as for a drill the diameter of the finished center size. Tom

@SDCustoms

8 жыл бұрын

Toms Techniques Thanks, Tom!

What do you consider when selecting a center drill size, particularly with small diameter parts?

@TomsTechniques

7 жыл бұрын

I've never really thought about it. It really doesn't take much of a center to support a part for turning, so I generally err on the small side. If it chatters, just use a larger one. Tom

@bardicdad

7 жыл бұрын

Toms Techniques thanks

@USMC_BABE38

6 жыл бұрын

I'm learning how to do this with my dad I made my first piece yesterday it came out pretty good

I would like to see a followup video of how you can center drill a part that is extended from the chuck like you show in this video. I'm new to machining and dont see how that could be done with the part moving arround as much as it was.

@TomsTechniques

8 жыл бұрын

+Larry Collier Center drills, because they are so rigid, don't walk around like ordinary twist drills. The center hole the drill produces will be on the part's center of rotation. The wobbling you see in the video was due to the part not being straight when it was centered while being held close in the chuck. If I had center drilled it while extended, it would have run true. Watch the video again and I think you see what was going on. Tom

@bandaid1957

8 жыл бұрын

+Toms Techniques if the part is moving in an arc wont that 1/8" center hole become the size of the "wobble". I would think center drilling both ends close in the chuck and turning between centers would be better. ?

@TomsTechniques

8 жыл бұрын

+Larry Collier No. It doesn't matter how much the part is wobbling. The center drill will always be on the center of rotation. The best way to see is to try it. Chuck a part so it is noticeably wobbling and center drill it. You'll find that the center hole will be stationary as the part continues to wobble. It just won't be centered on the end of the part. Turning between centers is not better, it's just a different technique. Sometimes turning between centers is not possible. Other times it's more appropriate to chuck a part and support one end. Every part is different. Tom

How do you get your lathe to brake so quickly?

@TomsTechniques

5 жыл бұрын

The Hardinge lathes have an electric brake on the drive. It saves a lot of time waiting for the spindle to spool down. Tom

what rpm should the lathe machine be while centre drilling

@TomsTechniques

5 жыл бұрын

Treat the center drill as you would any other cutting tool and figure the rpm accordingly. My video "Cutting Speed and RPM on the Mill and Lathe" Tells how, but basically you use the formula 4 x cutting speed / diameter. Center drills are so small that it is difficult to use too high an rpm, but too low an rpm will break the pilot off of them, especially in steel. Tom

Hi Tom, Your videos are very helpful for me as I have recently purchased a lathe and need some guidance. One question, in your video you bring a decent length of stock out of the chuck and show how much movement it has when the lathe is turned on. You then say you should drill the centre with the stock sticking out of the chuck. How can you centre drill the part when it is moving around so much? It seems like you would get a hole in a random spot and a snapped centre drill. Thanks.

@TomsTechniques

8 жыл бұрын

+Sam Jennison First off, the only time I recommend center a part like that is if you intend to hold one end in the chuck and the other with a center. If the part is to be turned between centers, it is not necessary to extend the part when drilling the center hole. Now the reasoning. You should never assume that raw stock (before machining) is either round or straight. So if you intend to chuck one end and support the other, you should center the stock with it chucked in the position that you will be machining it. That will allow it to take its natural position and not be stressed after machining. If you center the end of a bent piece of stock close to the chuck, when you extend the stock out of the chuck, that center hole will no longer be centered. If you force it back on center with a center in the tailstock and machine it, the part will flex back to its original position when released, resulting in a nicely machined part that is crooked. A bent piece of round stock chucked on one end will wobble, as shown in the video. If you center drill it in that state, the center will form on its axis of rotation, not necessarily its geometric center. Then you can machine it in a stress free state. Mind you that most stock is pretty straight when you get it, but if you do come across a crooked piece, this method will straighten it out. Clear as mud? Tom

@samjennison

8 жыл бұрын

+Toms Techniques Thanks for the reply Tom. That's what I plan on doing (holding one end in the chuck and the other with a centre) I understand that things usually aren't perfectly round or straight but if you stick it out of the chuck by say 10" and its wobbling around a lot, how can you centre drill it when it's moving around so much? Maybe I'll need to try it and see what happens but it just sounds like a bad idea to me

@TomsTechniques

8 жыл бұрын

+Sam Jennison There are limits on everything. Just use a bit of common sense. Tom

How do you know if the drill bit is in the middle of the part being turned?

@TomsTechniques

9 ай бұрын

As long as you keep the tailstock dialed in for turning, that's more than adequate for center drilling. Besides, center drills are rigid enough that even if it is off a bit, it will still put a center hole on the center of the part.

What about facing? Before center drilling, should we face part extended out of chuck for the same reason we can't drill it in chuck

@TomsTechniques

2 жыл бұрын

Facing an extended shart would be difficult due to a lack of rigidity, although I can't imagine where that would be necessary. If the end had to be dead true, you could always clean it up once the center was in place.

@AS-ug2vq

2 жыл бұрын

@@TomsTechniques thank you, one more question I've as a newbie. If we can't put stock through bore of chuck (20mm bore), 25mm stock dia. 15" stock length

I'm just curious why he faces off the stock from the center outward? I've never seen it done that way. Anybody know?

@TomsTechniques

4 жыл бұрын

I know. :) For light cuts, feeding out will normally generate a better surface finish. Heavier cuts require infeed.

You didn't cover the center drills without a pilot. They have a very short twist (flute) and the rest of the length (4-6") being solid round stock and a taper from the full diameter at the leading cutting edge. I have heard them touted as better than the ones you are showing and that I use but really don't know why they claim that. I see them as valuable for a longer reach but the broader cutting flutes would seem less accurate if anything?

@TomsTechniques

8 жыл бұрын

+Douglas Thompson You are referring to spotting drills. They are used to spot a part before drilling so the drill stays on center. They are not intended for use with a center because they have no pilot and debris can get between the center point and the bottom of the spot, preventing the center from running true. Tom

Watching after seven years after uploaded

how do lathes drill perfectly centered holes? What is the physics behind how it finds center? ........ I guess what it finds is center of rotation more than center of the part -right? but why does it naturally find this spot

@TomsTechniques

Жыл бұрын

A drill will not naturally find the center of rotation. To get holes on center, they need to first be center drilled, and then drilled to size.

@dizzolve

Жыл бұрын

@@TomsTechniques doesn't a center drill sort of find center even If the tailstock is off a few thou

You said "60 degrees" . WHAT PART is 60 degrees? Out on the very tip? The shoulder? If the number of degrees makes a difference in your results?

@Zkkr429

7 жыл бұрын

John Ohara the shoulder is 60 degrees. This is designed to fit most live centres that you put in your tailstock, which are usually 60 degrees. If you use a different angle you will only have a point engagement with your live centre, this is not desirable and your part is likely to run out. If you are only using it as a pilot for a jobber drill you can use different angles. I will use a 90 deg spot drill so I can centre and chamfer a hole in one op.

I've been having some problems with my wood lathe boring small diameter holes. Thanks for sharing your knowledge. Simon

@TomsTechniques

7 жыл бұрын

Thanks for watching

Wow, I didn't have a clue about the last part

@TomsTechniques

10 жыл бұрын

That type of run out on a part can leave you scratching your head, but most times it comes from how you hold the part to machine it. Tom

How do you align the centre ?

@TomsTechniques

4 жыл бұрын

The center should not require alignment unless the tailstock has been offset to turn a taper. If that is the case, it can be indicated using an indicator held in the spindle of the lathe.

@bigbothoee8617

4 жыл бұрын

@@TomsTechniques I have a Drummond round the tail section seems to rotate around just trying to figure out the easiest way to centre it thanks for help

The last tip was epic...I had been told this before but without explanation, I thought they were full of shit...now that I have an explanation to go with it, it is I that was full of it.

Hai i want lot how to increase face in depth of cut high how to grending tool

@TomsTechniques

2 жыл бұрын

Sorry I don't know what you are asking.

what is the different between center drilling and drilling??

@TomsTechniques

3 жыл бұрын

The tool used. Center drilling refers to a short, stubby center drill used to start a twist drill at an exact location, or create a cone shaped hole for a center on the lathe. Drilling refers to a twist drill used to create a hole of a specific diameter, to a specific depth.

@zakymr9808

3 жыл бұрын

@@TomsTechniques thank you

Mr.Gay said you dug that center drill in there way to quick for his liking

@TomsTechniques

8 жыл бұрын

+Steven Church Relax Mr. Gay. I can't remember when the last time was that I broke one and I don't ever remember breaking one in aluminum.

Try pulling the part against the center before closing the chuck.

@TomsTechniques

10 жыл бұрын

Why???

@bglenn3325

10 жыл бұрын

Tom's Techniques If you don/t have your shaft in alinement when you tighten the chuck jaws, the part CAN clamp crocked. By pulling the centered part against the tail stock, it will hold the part straight while clamping it. I have more problems with aluminum than any other materials. I have very good luck holding the projected center drilled hole against the center while tightening. That is very nice equipment you are working with! Glenn

when drilling, make sure to break the chip by letting go of the wheel on the tailstock (moving the drill outta the cut a bit). these long spiral type chips are dangerous, but you probably know that :). Have a nice day

@TomsTechniques

4 жыл бұрын

That's a good tip, when actually drilling holes. ;)

Tell me Tom.. why do some people like yourself face off a part starting in the center and working your way outward…??

@TomsTechniques

2 жыл бұрын

Because it produces a much better surface finish. Feeding in is better for removing material.

💤

@TomsTechniques

2 жыл бұрын

Maybe boring for you, but necessary for new machinists who lack this sort of basic knowledge. I'm sure there was a point in your life where you had no idea what a center drill was.

I covet your 6-jaw chuck.

@TomsTechniques

10 жыл бұрын

It is nice and concentric and very easy on parts. It would be tough to go back to a three jaw after all these years.

The thing you said at the end about drilling the part extended for the center is very wrong and is going to get some kids hurt. You must be a wood worker. Unsubscribed.

@Knaks

7 жыл бұрын

There is nothing wrong about it, you just simply don't understand.

@Clete88

7 жыл бұрын

He said nothing wrong. What he was describing is that if you over drill the center, you lose the taper contact pattern of the 60 degree intent. That 60 degrees is in effect a taper contact, which is lost if you over-drill.

@marycolville2755

7 жыл бұрын

Hi Tom, I'm not taking anything away from your efforts, and respect to you for uploading these videos(I couldnt have the patience) But I'm afraid ROLFhacks is correct. I see most of viewers here are novices or starting turning. But extending the workpiece out from the chuck to centre drill (depending on speed, diameter and distance from chuck) could cause the bar to whip causing damage. Don't ask me how I know lol. What you have in the video is ok though. A learner might take it as read for all sizes. Safest way is machine truing band on OD with bar in chuck. Set up in chuck gripping with as small a grip as possible, with truing band in fixed steady. Drill out for centre. The small grip allows bar to move without flexing when setting up steady.

@Clete88

7 жыл бұрын

Again, Tom did not give bad information. Read my post above, or watch the video again. He explains the logic just fine.

@marycolville2755

7 жыл бұрын

Clete Read ROFLhacks post again, he's not talking about the distance the centre drill is being drill in. It's how much the bar has been taken out of the chuck.