One of the mine maths teachers said: "Straight line is just an arc of a circle that has infinity radius"

@car9167

4 жыл бұрын

Most likely there is nothing like a straight line in the whole universe with all the gravity and action at a distance. It is only a concept in our mind

@RFC-3514

3 жыл бұрын

@@car9167 - You might argue that real space isn't perfectly Euclidean (though in most contexts it's close enough that it's impossible to measure the difference), but any line that follows the same curvature as space is technically a straight line. The ones in my mind are all crooked to begin with, though, because I don't like to set myself up for disappointment.

@ravener96

3 жыл бұрын

And as we see here christian is struggeling with abstract concepts. Cute

@JoAkh

Жыл бұрын

This is interesting to think about it. A straight line is what we see or imagine but even if we look at a precision ruler for example it's not actually straight. There will always be a micro difference. And this is for everything around us.

Awesome series, thank you for putting this foundational stuff out there. I may have already mentioned it but I would be really interested to hear more about putting a new lap to use and how to keep it flat.

Thanks for doing that Q&A, The only question I still have in my mind is: You have them flat how could you make them parallel? That's just mostly me thinking out loud, I realize they don't need to be parallel. After watching so much of your channel, ROBRENZ's channel and David Richards' channel I've rediscovered my love for this sort of work I've decided once I retire from what I do now I'm going to go back to the machine trades, at least as a hobby. Every day is a learning opportunity.

@sjwsbetaskiller6218

7 жыл бұрын

Making them parallel is a very next (higher) level. I doubt you will see it on KZread.

As usual a superb, articulate explanation of technique as well as the physical bases for it. I also agree that the classical score is the perfect accompaniment for such fine work!

..The desire to excel in craftsmanship should be uppermost in your thoughts. So, while you are building your model coach, think only of making it the finest piece of work you have ever produced. The praise of your friends and recognition by the Guild will take care of themselves if you have done your work like a real craftsman. If you adopt this attitude toward your work, you will be surprised how much easier it will seem and how much more pleasure it will bring you. Think of the fun it will be to make each little part of your model a masterpiece in itself, and then to fit each into its proper place and watch the solid, handsome coach gradually take form. The surest way to get the greatest rewards from your work is to keep the ideal of fine craftsmanship always before you. This is not my quote. It was given to the student competitors in 1932 for the Fisher prize sponsored by Fisher Body. I see this in your work and the work of your community on You Tube, Abomb 79, Keith Rucker, Keith Fenner, mrpete222, Clickspring, and many more on a list that is to long to list. I just wanted to say Thank You.

Nice work Tom, looking forward to seeing some parts lapped. ATB, Robin

Tom, thank you very much for your three video series. I am going to follow this technique to make two (even though I only need one :) really flat plates!

Thoroughly enjoying this series, very much appreciate your explanations of process. "The Magic òf Averaging!", that's going to stick in my mind. All the best Mat

Great series, thanks for taking the time, I'm learning!

Thank you for the great explanation on why you did what you did and remembering some of us don't have a surface grinder ;) .The commentary is the most important part of your videos. Thanks for the follow up.

This is a great series, Tom. Really enjoying it and I totally get the "journey" part of it. Putting in the time and elbow grease is what separates the Joe's from the Pro's.

@sjwsbetaskiller6218

7 жыл бұрын

Mediocre chumps/hacks will never "get it" (they complain this series is too long).

Very Cool ~ Was noticing the refraction on the plates before the Schooling on lighting

That's pretty awesome Tom! Very informative.

Tool for filing, Mozart for lapping: truly, Tom is a man of eclectic tastes. (This whole series is making me want to order three Pyrex blanks…)

@michaelgriott3922

7 жыл бұрын

Josh Myer Yes, the man who calls himself "The Ox" is in fact an intellectual machinist!

@FrBobLaceySD

7 жыл бұрын

Josh Myer Thomas Aquinas, a man of incredible theological genius, was called "the dumb ox"! Fitting.

@calinguga

4 жыл бұрын

@@FrBobLaceySD no such thing as a theological genius

@thegeneralstrike6747

4 жыл бұрын

Being eclectic myself I can feel silver and long ago stashed portholes urging we work together and bring the vast distances surrounding us a bit closer and possibly more importantly closer to those who have little idea just what can be accomplished with a few old scrapyard finds and some handed down knowledge.

@nicklimuti5186

Жыл бұрын

​@Călin Guga Theologists don't necessarily need to be religious, religion is their area of study. Having a deep understanding of religion doesn't mean you believe in it, nor does religious belief mean you are unintelligent. Most of the most important scientific and mathematical discoveries in history have been made by religious people. Just the observations of a non-religious guy of average intelligence.

Great series, and thanks for doing it. I'm going to try to make some plates as well, and my goal is to lap some Gage blocks that I have that were sent (big QC error, but it ended okay) incompletely lapped. Fun project, I thought. Side note, I'm liking that Lennox disk-- the kerf is wider than you'd think, but it's easy and nice to use (with an angle grinder, at least). Slower than the usual abrasive wheel, but the unchanging diameter is great, and the removal of the ever-present disk grab and explosion hazard makes it a winner in my book. Buddy of mine had an artery cut in his wrist and nearly bled out because of a shattered abrasive disk, and ever since I've been insanely paranoid.

Just wonderful. Thanks Tom.

Tom, thank you so much! You are a great teacher.

keep up the great work Tom! love your vids , very helpful could you please upload more often ;)

That’s beautiful. Thank you, Tom.

nice work. i like how you talk about how to get somewhere and why rather than just the fastest way to point b from a. keep up the good work.

Great video series👍 I learned alot, Master Jedi Tom.

Thanks for sharing Tom. A quick Google found this:- According to Title 18, U. S. C. section 331, it is illegal to "fraudulently alter, deface, mutilate, impair, diminish, falsify, scale, or lighten any of the coins coined at the mints of the United States, or any foreign coins which are by law made current or are in actual use or circulation as money within the United . BUT it says nothing about altering coins for personal, experimentation or artistic use. I think "fraudulently" is the operative word here. regards from the UK

@AlexanderGee

5 жыл бұрын

No deface is the operative word. The coins are literally being defaced. Still no one really cares

@stickyfox

28 күн бұрын

@@AlexanderGee Not at all... this would make souvenir pennies illegal, and that's the example that's typically used to refute this argument. The treasury has issued very explicitly worded statements including this example to explain that fraud, not altering currency, is the crime. Additionally, laws were added in 2007 (31 CFR 82) to prevent melting down nickels and pennies specifically for the purpose of recovering their metal value. It's always been legal to use US currency to make jewelry or sculpture or scientific instruments. *It's our money* anyway.

Loving the journey Tom.

Good stuff Tom. You hinted at more discussion on the light source, I look forward to that. I'm thinking that it would be fairly straightforward to make one using LEDs as a light source.

Hey Tom. is coming along nicely. Just want to say that you doing it this way is so us hobby guys that don't have or access to a surface grinder, can have a awesome lapping plate. Thanks Tom for showing this process. I think would use Pink Floyd instead of that classical music. Just me. God Bless Ya Dave

Thanks, I study tool and die making and your videos always deliver great insight.

Brilliant Tutorials for Lapping these discs. Watched all 4 videos just now consecutively . Looking forward to seeing the result. Flatness , squareness and roundness are the 3 vital components of accuracy and producing these laps is very interesting . Oh the classical Piano at the end is bordering on ostentatious :-D :-D . Great stuff.

I love the music playing in the back, it was very nice and peaceful watching you while listening to that.

@ramosel

7 жыл бұрын

I too like the classical stuff but prefer the days he plays TOOL!!!

@1jtolvey

7 жыл бұрын

CLASSICAL = THE BEST " WHITE NOISE " KNOWN TO MAN ! LOVE IT .

@bigun447

7 жыл бұрын

Ditto on the music. That is what is always playing in my place. Keeps the mice at bay.

@KnolltopFarms

7 жыл бұрын

Another great one to have as background music while working on something you need to think about is Hawaiian music. This was told to me by an old Master Carpenter named "Woody", best I ever worked for! He said "You don't really listen to it, you just hear it, since you can't understand the words". He would never let us listen to Rock because we made mistakes when "Rockin' Out" and singing along. He was right.

@EverettWilson

7 жыл бұрын

Knolltop Farms I love almost any music in a language I don't understand for exactly that reason. Instead of listening to the meaning of the singing, it's reduced to an instrument.

I have no idea why I'm watching this.. but it's so interesting! I cant stop OR change the video!! Thank you for all your hard work! I had to subscribe!

So in he end the flatter the better even if you have to walk a few kilometers to get there. I think this is very interesting being a machinist ,keep up the info videos !!

Good stuff. Thanks Tom

Very informative. Nicely explained. Thanks.

Those blades do great. I got one and used the heck out of it and it's still going.

@vincentgizdich2842

3 жыл бұрын

What kind of material have you used em for? Used it on what tool?

Your doing a great job thank you

Hey Tom, Just when you were talking about the rigidity of the cast iron plates, I couldn't help but think about the layer of loctite/adhesive between the pennies and the aluminum backing plates. Isn't there a risk that under pressure/temperature changes/time there might be movement of the pennies relative to each other? Probably minimal, but that could be significant at the 150nm scale.

@kundeleczek1

2 жыл бұрын

Pennies aren't contacting with plates only by loctite but also by themselves.

Good stuff... Thanks for sharing ;)

Cool series!

What a wonderful demo surface. ..not a lot of loading between lapping components and an angular reference for accuracy in progress👍🏻

Thanks man. I love this stuff.

I'm so happy, today I went to a yard sale and bought for $15 a big Jacobs chuck with a 1 1/2 - 8 thread on back that fits on my craftsman lathe.

Thanks for clarifying the "theory" behind the 3-plate method of surface accuracy . I always found it quite strange in spite of the empirical evidence .

I really enjoyed the 4 series of these...one of the other reasons diamond powder and paste charge cast iron is that CI is porous, and hence thats why its so good for dry lapping, the charge gets in there good.....but as you note not to used in facing or conditioning a plate.....for a finished CI lapp, they are easy to charge with Diamond powers, a carrier and a roller bearing..you could even divide a block up four sections and charge with different grits...

When spinning the top plate the music synced up and it was soothing.

Great job Tom, I'm really digging this series of videos! I know it doesn't fit in with the self-proving 3 piece process, but I remember reading about a "ring lap" used to flatten a concave lapping plate. One of Guy Lautard's books maybe...?

@evildrome

5 жыл бұрын

That's what that is! About 10 years ago I went to an auction of a company who had a dozen or so large lapping machines and I picked up a ring off one of the machines which was about 10" across, maybe 1 1/2" tall and 1/4 thick. I thought it was one of the parts they made but I now realise it was a conditioning ring.

@humanistwriting5477

Жыл бұрын

I owned some for my lapping machine! Run up to three rings slightly smaller then the radius of a powered lap. They will level the wear from lapping. Up to two can be ran as you lap in a lapping machine. Other desogns include huge rings that run through the center of the lap, and other methods include over lapping lapping plates. There is a noticeable danger of creating a conical lap.

People tend to forget that Diamond is Carbon. Iron/Steel that Ferrous material absorbs Carbon and absorbs diamond. I used to facet sapphire and used diamond laps. The laps were AL. For heat and not to mess with the iron. We were told not to grind with the laps any steel or iron. We used wood sticks and hard wax. Our laps lasted. We used grit when grinding other stone between two cups at an angle to make 'balls'. I did one in obsidian glass. Use lots of coolant when using diamond and steel.

"The magic of averaging." I'm gonna remember that one forever because it's true.

And I thought chasing .0001" was fussy work then Tom takes it to the next level! I suspect Tom has a new angle for the 4 jaw contest at the bash, the new criteria is whoever dials the fastest to within 20 millionths wins. You have to use your own indicator. :-)

Come on man, I want you drive us straight into downtown nerdville. We can handle it

Hello Tom, an alternative to the white vinegar in the copper cleaner would be citric acid. It works just as well, has no smell and can be bought (and stored) in solid granules. I get mine from the Asian supermarket.

Been waiting on this video Tom, enjoyed it. and my wife thinks the penny idea would make a good decoration. go figure.

This is so similar to grinding telescope mirrors. I did the same thing as the copper penny thing, but used stainless steel washers, backed with dental cement.

Thanks so much for this and all your great videos, super informative and fun to watch. I’m desperately trying to come up with a system for lapping plane irons and chisel backs, anything based around sandpaper rounds (dubs) off the edges so when you go to a stone it doesn’t abrade at the edges where I need it. I’ve seen in the world of lapidary they use a rotating lapping plate with an abrasive slurry, like hand lapping under power seems like? So here’s my question: if I glue a bunch of pre-82 pennies to the platen from an old disc grinder and face them off, then use some kind of arbor to spin it, would you expect that to make a decent initial lapping machine? From there I can go to oil stones or diamond plates or something flat. Thanks in advance for your consideration, I really like your videos.

"Nanometers are dinky, ok?" - Tom Now thats a tshirt

Great music for getting into the lapping zone. I might try something like that for scraping. Currently using as quiet as possible. Repetitive work is only tedious if you let it be...

Great project! We may disagree on some technique, but _ipse dixit_ - the results will speak for themselves. If you get them flat all over to a quarter wave, it will be as good as what the method I have recommended usually aims for. And fast forward through the interesting part where you trot out the numbers? Not likely!

Your statements on convex or concave stirred my thinker a bit. Surely thats a function of the diameter of the lapping plates as well as the distribution of the polishing compound. If these are safe assumptions, perhaps the binary of "convex or concave" could be controlled a bit more by designing the physical polishing movement to increase the 24 mile radius to something closer to 100 :D It also makes me think of the movements of orbital sanders, something like a dewalt, which have surprisingly complex movements about their axis. Brilliant video!

Random thought that entered my head: "Mommy, when I grow up, I want to be an optical metrologist." It actually sounds like it could be a pretty fascinating field of work...

Thank you Tom for sharing this with us. You probably could also use this method to flaten your oilstones. Just take three of the same grit and hardness, put some oil in between and do the three plate method. You will hopefully end up with precision oilstones without the need of grinding them with a diamond wheel on a surface grinder. I don't know if this works... Just thougt about it recently. Greetings from Germany

@oxtoolco

7 жыл бұрын

Hi Johannes, You are quite right. The hard part with oilstones is actually measuring them. You can use an indicator but you have to be pretty careful not to wear the tip out. Thanks for the comment. Cheers, Tom

Great videos - What would be a good range of micro paste grades to purchase to start with? For example, I see that I can buy increments from say 0.25 micron to 40 micron, but do I need them all or could I skip a few and still have a good range?

If you're going to clip them anyway, is there any reason not to do optimal packing in a hexagonal pattern?

@johnm840

3 жыл бұрын

I was thinking about that as well, probably not needed but would look better with symmetry. Have to do some Cad work to see. Be a nice Math problem to maximize surface area. Smaller Radius parts would lead to that. something to mull on.

If your platen was 172mm(6.79in.) diameter you could perfectly fit 62 pennies in it; or 156mm would fit 50 pennies.

@intjonmiller

7 жыл бұрын

darklordofapathy THANK YOU!!!

I really like this video.

and I'm eagerly waiting for the nerdgasm to commence!!!!!

hmm i think if You started gluing pennies/washers from inside it would give nice honeycomb pattern but with more overhang but it was not the problem since it was trimmed on lathe anyway

Hannibal Lecter music in the background. Lol. Awesome. Thanks for sharing

the idea of rotating the bottom plate too is that you otherwise have strokes in the same directions on that all the time. you are correct that you rotate the plates relatively to each other, but here comes the thing of the post in the middle of the room, you mentioned in an earlier video. if you walk around that post, you "rotate" the bottom plate relatively to your back and forth motion. if you then rotate the top plate in your hand, you have what the commenter mentioned: a rotation of the plates relatively to each other and relatively to your main motion direction.

Is this like making lenses, where the top one always winds up being the concave one and the bottom the convex?

Hi Tom, many years ago I made an 8 inch reflecting telescope. Grinding the mirror was almost the exact same process you are following. The difference was of course I was aiming for a circular then parabolic finish. In the final stages of polishing the two blanks would often stick together and it was a hell of a job to get them apart. Do you get the same issue with the flats? For info, making the mirror took about 60 hours of grinding/polishing. Accuracy was about 3 millionths of an inch, a fairly ordinary figure.

@jpmorgan187

5 жыл бұрын

Do you have any more info on the reflection telescope and how you made it?

Another note, you have to watch the Starrett centerfinder 45 degree heads, they are not equal lenght on the ends, and have a hand radiused end, and if you get out onto the end past the ground flat, they are no longer a true center.

"Nano-meters are dinky, mkay."

Thanks Tom

Truly excellent playlist!! I have really enjoyed and taken some of this process for use in my own endeavors. This process is proof positive that despite the supposed technological advances made, historically humanity has possessed not only greater protean knowledge but, also the greater overall ability to use the knowledge with some level of skill. The case I would make for today is that the technology is possibly less useful, less efficient rendering it wasted despite or perhaps because of the exceptionalism indoctrinated into the nehscient by the ignorant or narrow of minds. Could it be that it is the experience of setting ones own parameters to achieve a goal in essence a sort of earned freedom through wisdom? A freedom few know today the ability to draw upon experience, form a process and achieve a goal therefore legitimizing ones authority in that broader craft? I have personally experienced some of the most meaningful achievements by using a method rather then an set of instructions. To say another way the master is presented internally or externally with a goal. If one is truly an authority within a craft it is not the method that will legitimize that authority. It is mastery to use any number of methods to achieve the goal. When I choose to achieve those goals by my hand rather then going for a power tool or setting up a machine I find more that the product of my hand was more efficient effective and overall more satisfying. I would chalk any challenge to working with ones own hand having to do with modernity inability to suffer and in turn reap the benefit of growth for that suffering.

I tried drinking everytime you said "ok". Thas was fiftan minutes ago and now I'm drunk

@stevengabriel8406

5 жыл бұрын

I did a double shot for "mmm kay" as well, and am on my way to the hospital for alcohol poisoning now...

Hi Tom, Great discussion about going into the micro fine finishes, abrasives and flatness, I'm picking up good info with this... Cheers, Pierre

@sjwsbetaskiller6218

7 жыл бұрын

That shows, how uneducated "KZreadrs" are, in general. Yet, with incomplete set of knowledge/skills they are "on the mission" to "teach" others, like they are "authority" or something. This is epidemic in the internet. The best machinists/tool/die/mold-makers don't have the time to fuck around and make videos.

@intjonmiller

7 жыл бұрын

SJWs & Betas Killer The horror that people share and teach while learning. What is the world coming to?

@pierresgarage2687

7 жыл бұрын

If we had to wait for only 100% educated people to share their precious knowledge even schools wouldn't exist, a good discussion initiated by serious people will often light up a good idea and progress into a path forward to better ideas and products... ;) ( Another reflection, do 100% educated people really exist...??? )

Thank you for saving me the time to write a pedantic comment. Wait. I just spent the same time writing this. Can't win. :)

Your description of the radius of the curve involved in tiny differences equating to 38km gave me a thought! Maybe you should demonstrate to the Flat Earth crowd that something that is scientifically "Flat" actually isn't, so when you translate that UP to the size of the Earth "perceived" flat just DEFINITELY isn't. Ergo even if they think the Earth isn't a globe, it is NOT flat! 🤔🙄🤣🤣

Every week that goes by without seeing another episode makes me a little sadder inside. Hope all is well and I can get my fix soon. (And, of course, I realize there are much more significant things than my viewing habits.)

Comes a point, the size of the specimen's molecules and molecular vibration become the limiting factors, not to mention temperature variations in the surface. See? My parents said I was why there could be no nice things, but *science* is why we can't have perfect things.

It's easy to tell which penny is which. Drop it on a hard surface. The fully copper ones have a nice ring, where the zinc-cored pennies sound dead. Also the copper ones weigh around 5g, where the zinc ones are only about 3.5g. For cleaning pennies. Ospho does a SUPER job.

Hello oxtoolco, Could you please explain how you charged the copper surface? Did you mean where you apply a certain grit into the pours of the copper and burnish the surface, then only using that type of grit for that particular plate?

OOOOHHH!!! I've been looking into trying out that type of cutoff wheel from Lenox. Looking forward to how well they work. What's your thoughts on it?

@vincentgizdich2842

3 жыл бұрын

Do they work?

I was really hoping for a part five.

Can almost imagine the distance required pushing back and forth to lap these triplet plates "flat" is about 100 miles too. That radius idea is fascinating. Nothing can ever be PERFECT, but yowza, prety damn flat is right.

You mentioned that there was different methods of charging the laps, may I ask what those are? Thanks for posting these videos!

Thanks for filming this. I'm not a machinist, but this video series was fascinating. The abrasives part was particularly interesting. You mentioned that the abrasive you chose breaks down as opposed to diamonds -- if the abrasive becomes finer and finer, why doesn't it leave a mirror polish now that the surfaces are so flat? Does it just scratch and break down too fast? To get to the polish for the light test, you used a different abrasive.

when you have a surface plate all you need is those 3M lapping sheets and you can go all the way to 0.1 micron. Or start on glass and use it for the finish

Just a thought: I used to use diamond wheels to cut obsidian when I was a kid. Would obsidian/glass work for lapping ?

Hi Tom, really love that serie, really enjoy that you stop in Nerdtown and get more details about that light. When we measure with a round optical flat for round part that are around .00005 to .00002 it seem that we trap air between the lens and the part, we see a reading but when you press down it suck the lens on and than we got another reading... is it a concavity phenomenon of round surface since the perimeter will seal?

@oxtoolco

7 жыл бұрын

Hi Simon, You are correct that there is air between the flat and the part. Getting it to settle properly with no trapped particles is part of the challenge. You need to push on it a little to determine what edge is touching the part. Pushing too hard distorts the flat and gives false readings. Thanks for the comment. Cheers, Tom

Very interesting Tom! One question: when using the lapping plates they get used, right? So, we have to make them flat again. How often do we need to relap them? After every lapping of a workpiece? Thank you, Serge

I would like to know what that high shear lathe tool is that you used on facing the copper. I've searched around and can't find out what it is. Also, that lower plate becomes the upper plate at one point in the sequence. So it does rotate, just at a later date.

@robbiejames1540

2 жыл бұрын

I belive that's a CCGT AK10 polished alu insert

@Gkuljian

2 жыл бұрын

@@robbiejames1540 It is! And I've been loving them for the last couple of years. And thanks for the reply!

@robbiejames1540

2 жыл бұрын

@@Gkuljian Yay! I've just gotten my first lathe and I've been having trouble with stringing with aluminium using these inserts - any tips?

@Gkuljian

2 жыл бұрын

@@robbiejames1540 I am not a seasoned machinist. I'm a design engineer who only machines when needed. Speeds, feeds, material, cutter. Wish I had more to offer. Best of luck to you!

@robbiejames1540

2 жыл бұрын

@@Gkuljian Ah, thanks, don't worry.

Hi, Tom. Old clip, but... At 20:20 you mentioned that embeded diamond can be removed from lap. How? I'm strugling to remove diamond from copper lap and can't find way to do it. If it's important, it is fairly coarse, 60 micron grit.

I'm curious about what advantages there are in putting copper on these aluminum plates as opposed to just making aluminum lapping plates, in the same way you made the cast iron one ? Also, I have a 20 inch round granite slab, I'd like to lap flat but all I have at the moment is 6 inch , 1 inch thick aluminum disks. The granite would be very hard to remove to ride on top of anything. Can I make some aluminum lap , at 6 inches and use those to lap the granite flat ? Can you share where you got the diamond emulsion on Ebay ? I can't find it.

I've been playing around with various ways of lapping small (~3cm) tungsten discs. Fiber lapping film on float glass after using a dmt diamond plate seems to work but it's terribly slow. Any tips on a better way for doing low volume (half a dozen or so a year) lapping and polishing hard materials?

@Molb0rg

7 жыл бұрын

stick them to a disk, like he did with to the pennies and make them all in one pass, spend a day making them and use them for a year. So basically make more in one pass.

isnt the glue under the pennys keep hardening and changing volume slowly over time?

Please, can you tell me just how those lapping plates can be used further. It is for producing (checking) flat machining surfaces? Can I use them to check ways of my DIY lathe (ways about 40")?

we would like go purchase new lathe machines for our school we have the the old colchester triumph 2500 vs (1250 mm) from the 90's and they still running excellently, but the new ones I've heard are not made in the UK but in Taiwan/China. can you help us with any recommendations equivalent to the good old colchester

can you lap parts flat enough to wring them together like Joe or gauge blocks? can't find anything on KZread that explains this. I think that would make a great video when your done with the laps. please and thank you.

I just have a comment a question and a tip if that is ok. First, you should know by now that no matter what you do in your videos there will be at least a dozen "experts" who know better and will tell you that you are doing it wrong even though you have explained fully why you are doing it. My question is, I thought that heat broke down the strength of super glue so would it not mean that the copper will fall off when being used or does it take a lot more heat than what is being created? Now finally my tip, The best thing I've found for removing the "patina" from copper coins is cheap cola. In my experience the cheaper the better, once I realized what that stuff did to copper I immediately banned it from my house! A great video Tom thank you very much for sharing your obvious skills and experience.

@siggyincr7447

7 жыл бұрын

Not to claim that soft drinks are good for you, but your stomach acid is far more corrosive than any soda.

Hey Tom, totally digging this lapping series -- but metrology really gets me going. Do you have any tips on where to find optical flats? They seem to be in that common $100 no matter you look range that a lot of measuring tools live in.

@highpwr

7 жыл бұрын

surplusshed(DOT)com

center feature is due to variations in surface speed / tool pressure over the radius?

@sjwsbetaskiller6218

7 жыл бұрын

This is a part of the problem. Another is overall lathe alignment (spindle to ways, ways to carriage) and leveling and general machine stiffness.

@oxtoolco

7 жыл бұрын

Surface cutting speed when facing drops to near zero unless you have a constant surface speed machine. Cutting action changes as you approach the center so you get some effects and artifacts. Thanks for the comment. Cheers, Tom