These midweek episodes are awesome keep them coming Adam!!

Hi Adam! What I think the supplier does, that nut is is supplied undersized, so you can take a dust cut across the screw because you have worn Center sections and therefore fitting the screw to the nut that's what I would have done. Also check the screw across wires top bottom and middle and you can determine how much wear you have in the pressure angle.

There used to be a seller on ebay that sold the crossfeed nuts that had a partial saw cut through one end with a set screw installed. This allowed you to tighten the set screw which spread the last thread or two apart allowing you to tighten the backlash. I bought one for mine and it worked very nice.

Might not have been the case with this nut. Every time I've replaced a lead screw nut with a new one from the mfg, I was never able to screw it through the nut by hand. I had to grease the lead screw and run the lead screw through nut with a drill. Always tight and smooth after the first two runs throughs.

@nicholassmerk

13 күн бұрын

I think you are correct. They cut it undersized for a reason. I have a feeling the seller was supposed to state it was undersized (they probably didn't know).

I've just been through the identical exercise with my Hercus (South Bend ) lathe. Had the same problem with the replacement nut. Thanks Adam, I enjoy your posts.

Very common new lathe owner concern- minimal cross slide backlash like that is virtually meaningless. I think lathe owner at one point or another has wanted to replace their cross screw/ nut. I've made several for smaller lathes but I usually tell people not to agonize over it now. Best not to sell something to someone that they don't need. Good video regardless! Nice to see that the tap worked out

Adam, when I do a positioning nut, I run the tap in half way from both sides, leaving a semi-uncut middle to minimize end-play.

The problem with cheap tap suppliers is that you can't choose your H limit. That's probably an H3 or H4 tap which means it is probably 3 or 4 thou over nominal. Using it on a worn thread means you'll have a lot of back lash. You needed an H0 tap to be right on nominal size. A hack to get around it, is to not go all the way through, but leave the last couple of threads still in the taper portion of the tap. Keep goong back and forth checking it till the lead screw will go through but it is nice and snug.

You said it was a left hand thread, you showed it was a left hand thread, and yet my brain still yelled 'Yer doin it backwards' when you started threading in that tap.

@davidcat1455

16 күн бұрын

😃👍Same here

Adam, I ordered a tap from that same company. I needed a 12-16 acme to make a shaper spindle nut. It worked out fine for $16.

You measured the original nut with far less thread engagement.

I've had luck on small nuts like this, cutting a slot in the center of the nut, then squishing the slot closed slightly. Not a perfect fix, but a free/easy one.

I've staked mine in my 1933 south bend 9 inch just to get by until I can built a new one.

great job Adam

Thank you Adam for this new video. My metal lathe, and my milling machine too, are old machines, they are around 80 years old. I was given the lathe as a gift, but I had to completely restore it. In particular, I redid the controls and the two control screws with left-hand thread. I managed to remove play from the small carriage control using two lapped nuts one on top of the other. I didn't want to use a screw or spring system. The assembly works very well and is very smooth along the entire length of the screw. I changed everything because the mechanism was too worn to repair. I couldn't reuse the bronze nut which was too old and too worn. Thank you again for this brilliant work and good advice. Christophe

Two comments: 1. It looks like someone did some peening on the old nut with a center punch to try and shrink the threads. 2. I would consider making a jam nut to fit against the original nut perhaps with a bellevue spring washer between them. That would load the nut to one side of the threads and take out the slop except for loads that exceeded the spring strength.

Hi, I purchased a couple of Chinese Acme taps, the first one was cutting very large and causing excessive slop between the nut and rod, I finally bought a used one made in USA. that one was very a nice fit. After that experience I would test the tap first on something that doesn't matter. Rich

I notice that the nut was tipping up and down when you were checking for backlash, which won't be possible when it's installed. Backlash might be better than the measurements would "indicate" 😁

@lerkzor

16 күн бұрын

Agreed. I was surprised that Adam didn't clamp the nut in the vice, thread the screw through to midpoint, and measure the lash at the tip of the screw. That being said, Adam has at least 5 hours more time as a machinist than I do, so I'm gonna assume that his method was good enough for the task at hand :)

@BeenThrDunThat

16 күн бұрын

He wasn't trying to get a super precise measurement. Just something to do a simple comparison of before and after.

@zorbakaput8537

16 күн бұрын

Correct the armchair guys always know a better way!

@ellieprice363

16 күн бұрын

I think he wanted to test the backlash in the nut. Checking in the middle of the screw would have shown the combined backlash. .015 is not that bad for a lathe. A new nut wasn’t necessary.

@melgross

15 күн бұрын

@@ellieprice363true. But there’s nothing wrong with trying to get backlash out as much as possible.

looks like prior owner tried to make it fit tighter by using punch. Brass pc. has a # of punch indentations. You could have machined the spline with new threads 2-3 thousands Then a super tight connection.

Excellent work,Adam.Thank you.

I have a vintage Southbend lathe and it has the same amount of play in the feeds.

Ow please can we have the old intro tune back?

I did the same thing for my small lathe. Amazon tap worked brilliantly in brass. Steel? I wouldn't chance it, but you can't argue with 2 day shipping and results.

🎉🎉If you had another nut, you could remove just a little material on the tap. and the lead screw will be less loose, I guess😉

Thanks for sharing

Worn tap would work better and only use halve of the taper too, and back out otherwise cuts too much meat. Then use fine lapping paste, too fit

@abom79 do you think someone tried to "tighten" the original nut with those punch marks?

@user-ev1bi3jh2f

16 күн бұрын

I’d wondered the same thing.

@JimWhitaker

16 күн бұрын

Or was that a way of "fitting" the nut to the lead screw during manufacture?

If you need to tighten up the threads could you dress down the tap thread to reduce the width would you not cut as deep to take up some of the wear?

My original cross slide lead screw nut is cast iron ( 9" Logan model 400) I thought that was weird. I wound up brazing the internal threads and ran the tap through that. Not perfect, a little tight at first, but worlds better than it was. I'd like to make one out of brass. I have plenty of brass stock, just not confident enough in my abilities. Only have the small lathe and a 1/2 hp drill press.

Nice work. I did the same thing, bought a tap and made a new nut from scratch. My old nut was nearly worn through. My Atlas lathe which is very similar to the south bend has two nuts securing the cross feed handle. If those nuts aren’t adjusted correctly it gives the feeling of having more backlash than there actually is. I hope the owner takes his time and adjusts those nuts carefully. (Same thing on the compound slide)

I’d like a good mix of both . Production runs and one offs . But hey it’s his business venture not mine .

@manifold1476

16 күн бұрын

"off" WHAT?

I get my taps from Kodiak cutting tools coated they are sharp and good.

Very nice❤

Some of the old SB lathes have a bronze tip set screw or screws that you can turn to take up the backlash.

the person with the lathe will have a Vernier not sure how much measuring they must do lol 3/8 v 7/16th lol

Olá amigo Adam muito bom trabalho!!!

Since I'm not a machinist but, been around such machines and living, working on a farm, if the nut is worn, so is the shaft, either replace with new or make new one's yourself. I'm sure my comment doesn't mean diddly but, it's common sense.

@utidjian

16 күн бұрын

The shaft (or lead screw) is, in this case, made of steel. Often lead screws are also hardened and ground to final size and finish. The nut is, in this case, made of brass or bronze which is far far softer than steel. It is much smaller and MUCH simpler to make a new nut than a new lead screw. The nut is what one might call a "wear part"... in the same way you replace your brake pads with new ones but not always your brake rotors (not the best analogy but the only one I could think of.) It is the same thing for the longitudinal lead screw on a lathe. Damned expensive to buy a new one every time you replace the half-nuts for threading.

@Ham68229

16 күн бұрын

@@utidjian I fully understand that however, what we don't know is, how old is the southbend, what kind of abuse has it had in it's life, what's the condition of said machine, even hardened steel will wear. Just only speaking from experience on the farm. :)

@ellieprice363

16 күн бұрын

@@Ham68229Lathe and milling machine screws are tough but not hardened. Moore jig borers and grinders and a few other high precision machines would have hardened and ground screws.

@Ham68229

15 күн бұрын

@@ellieprice363 Not disagreeing, only stating my experience and I know everyone's experience is different. :)

@ADBBuild

15 күн бұрын

He said at the beginning of the video he measured the screw and it wasn't worn.

I bought a 1/2-10 acme tap on eBay to make my atlas lathe lead screw nuts. Description said it was a lead screw tap. $17.00 and for a Chinese tap it worked great with zero backlash.

Adam I would suggest trying the tap in a virgin hole the right size and then measure the back lash. Also the other variable is the male thread. Using the thread gage how much slack is in the gage and male thread when measured by feel. I have also used the Acme taps from Amazon and had good results making my own nuts for my Clausing cross slide and Clausing half nut.

I just went through a VERY similar exercise, except my issue was a tailstock feed screw bushing that was boogered internally. Ordered a 5/8-10 LH Acme tap from everyone's favorite online purveyor of... well, everything, and ran it through the nut. Sure enough it cleaned things up (I used Anchor Lube, as well), but as was Adam's experience, the fit to the threads on the feed screw wasn't what one would call precise/tight. Fortunately, this was one nut of two, in a backlash-elimination type setup and I was able to get things adjusted such that the endplay was minimized. Thankfully, radial play/misalignment is controlled by a separate bearing (which was also replaced), so the whole shebang feels like buttah now.

Very nice work sir. Not easy to make a lead-screw on nut.

My Logan 400 is 7/16x10 tpi I actually bought a tap off Amazon as well mine was I think Nitride coated though. Worked great for me

well... have to to wonder why that old brass has dents at "top". i would say thats for adjusting the screw ?

@jameslong3351

16 күн бұрын

They were trying to tighten up the threads by compressing the metal. When it's worn the best temp fix is to slot the nut an hammer it closed a little, just temporarily.

this guy must have stock in Anchorlube

@superdavett2

16 күн бұрын

I think he must have stock in a lot of sponsors. At this point the whole channel is highly commercialized.

@jerrydemas2020

16 күн бұрын

@@superdavett2 But it is free to watch!

@tates11

16 күн бұрын

@@jerrydemas2020 Lots of people pay the youtube subscription. Put the Anchorlube in the hole instead of on the tap. It always stays at the front of the tool where it is needed so lots of holes can be prepared without having to coat the tap every time.

@charlesgibson4184

16 күн бұрын

Is anchor lube a bad product?

@WaDahDahDang

15 күн бұрын

@@charlesgibson4184 Not a bad product - if it was he wouldn't use it. Just sponsored so he gives it more camera time. Blondie Hacks also uses it (I believe not sponsored), so for me, that tells me it is good.

In my experience the Chinese taps cut pretty well as long as they are high speed steel. I believe it is because HSS has to be ground which leaves a nice sharp cutting edge vs high carbon steel taps which are probably machined some other way. I'm sure a USA made tap will last a lot longer but for us home gamers who will probably only use an odd size like this once the Chinese one is usually going to be fine

Hi I'm also trying to tap a 7/16ths with a 3/8ths thanks for the info

@tates11

14 күн бұрын

🤣

Chasing perfection on old machines is always a case of hope over expectation. How many parts does one change?

Why was the new aftermarket nut undersize to begin with? I would have then machined the thread on the shaft again, just enough so that the new nut fit nice and snug. This way there will be no play along the entire length of travel. It'll be like new!! The pitch stays the same. Yes they are not to spec anymore, but the next time they wear this bad, its time to get or make a new shaft and nut anyway. I think this is why the nut was actually undersize???🤔🤔🤔

I rather suspect if the thread was that bad to begin with there is no telling if the actual hole was the right diameter and so running a tap through, no matter how good it is would not fix a sloppy hole. I would remake the leadscrew and use the tap to do the thread and I'll bet its works just fine. I'm a home a home machinist and I buy quite a lot of tooling from China and for the amount I use it its brilliant, there is no way I could have the tooling selection I have at professional prices. When I find a good supplier of say gear cutters I tend to stick with them for other sizes same goes for milling cutters, I have never bought taps from China but would if I needed something like an acme

People put to much worry in the lead screw for the cross slide for the lathe. 99% of the time when your turning the pressure is pushing back. now leadscrews on mills backlash is something to worry about.

That old one was peened a bunch to try to get it to tighten up, I see

Nice job, Adam.

makes me wonder if the internal threads there were cut with a 3/8-10 acme to begin with... considering it was cutting nearly from the start.

you can always get a tap that is certified and of hi quality to ensure exact fit and perfect geometry.

I’m wondering weather the new t-nut was 3/8”and not 7/16”. Also before I’d condemn the cheap tap for cutting oversize I’d check the resized t-nut with a go-no go gauge.

They make tighter cutting taps.

I think theres too much slop, ether id or OD was made oversize. I was able to replace a cast iron nut in my nuttell lathe with ally bronze in the same lathe. All was made in same lathe except for alittle vice work for the radius with file. I made a male thread gauge first to my calc's of standard thread LH Acme form. Squared off bronze block in lathe, yes a pain but had no access to mill or another lathe. Bored hole and cut thread to form a good/slightly tight fit, then turned stub and tapped hole thru it. Worked out well, been in use for 6 yrrs now.

Would have been way cheaper for him to just get the correct tap and do it himself lol

Backlash on lathe cross feeds is pretty unimportant. So easy to compensate for. Most do it without having to even think about it.

@fearlyenrage

16 күн бұрын

😂 It is annoying so it has to been fixed. Maybe you should fix yours to.

@swedishpsychopath8795

16 күн бұрын

@@fearlyenrage Clearly he has some loose nuts, but as long as he is happy we'll accept him as he is.

@donsfromnz6515

16 күн бұрын

try relling that to a carbide parting tip while cutting something gummy!

@johnfriend240

16 күн бұрын

@@donsfromnz6515 That's a South Bend 9 inch cross feed nut, pretty sure he's not parting with carbide inserts, gummy or not...

My x,y table has a 1/4-20 leadscrew. Right hand.

Nice video, just too many variables that cant be answered without making mult parts to find out the 'why'. I noticed his stock nut was 'measled' (my term) in hopes of tightening things. Did he do that or the prev owner? The lack of backlash adjustment saddens me.... bc I have a 13 and it probably will/does suffer the same issue of design. Some slice thru the nut and add the adj bolt. But on a SB? Demz nuts aint big enough for Ken's scale Winnebago. A custom SB nut might be the solution. Why doesnt that get made instead of the generic nos looking nut?

Would've been cool to see you try tapping a blank piece of stock for reference, oh well.

One other option would have been to use the 3/8" tap he bought like a boring bar in the lathe to widen out the threads. You could have also optimized the thread depth for minimal backlash while doing this.

@utidjian

16 күн бұрын

Why do that when he can get the correct tap for $27?

@duaneohall

16 күн бұрын

@@utidjian $27 plus wait for Amazon. Any time I can save time and money and get the job done correctly, why would I not go that route?

@utidjian

16 күн бұрын

@@duaneohall Sure... I could see trying what you suggest if I was in the middle of the Indian Ocean on an aircraft carrier and for some reason I had to get the crossfeed screw nut that was in spares working... but that isn't my situation. Nor, I would guess, is it Aboms (Jacks) situation either. I value my time far more than $27 times however long it would take janking around with the wrong sized tool. With the right tool it takes less time to cut the thread correctly than it takes to compose this reply. Anyhow plenty of ways to skin a cat or win our own battles. We are fortunate to each have the choices on how we want to do it.

@rufustoad1

15 күн бұрын

Agree. Not sure why Abom did this but a great video would have been to do what you suggested. I might have learned something.

@Brian55126

14 күн бұрын

Not

Adam, I have that same lead screw on my South Bend. I cannot find a source for a 7/16-10 LH ACME rod to replace mine which is severely worn. Top of thread is sharp enough to cut. Can you help me?

@mikewilliams5873

16 күн бұрын

Could you upsize to 1/2-10 LH ACME and tap out the nut to match?

@DonMason-cv6og

13 күн бұрын

Have done that on at least four leads crew repairs. Worked just fine. Found and used half ten precision ground acme. Lh stock. More readily available than the 7 sixteenth ​@@mikewilliams5873

I whinced when he put the tap all the way through without checking the fit as he went. It's now almost scrap.

@tmmtmm

16 күн бұрын

If you back it out, it'll cut even more off and become looser. This is a one and done deal.

@bertblankenstein3738

16 күн бұрын

It originally wasn't working, so things could only improve.

@tates11

16 күн бұрын

@@tmmtmm There are many variables to make your statement universally true, too many to list here. One in particular is worth mentioning and that is a skilled operator will have been taught to avoid this and have the feel to prevent backcutting. The point I was making is that if the tap is inserted at increasing depths all of which are before the parallel finishing teeth engage. When the tap is reversed to back out, the tapered teeth are in a larger threaded hole so they can't cut what they are not touching. Repeat cautiously and gradually from each side of the hole until the male thread goes in. In this case the subject was a leadscrew with a worn center section and virgin threads on the ends. If the nut is opened out to suit the unworn threads on the ends it will always be even sloppier in the middle. In this video he managed to get it sloppy on the full size threads on the end, he never showed the increased play in the center of the leadscrew! I suspect the nut thread was deliberately made to a slightly tighter spec for a closer engagement on the worn area of the leadscrew. My first operation would have been to see if the nut could be forced over the virgin threads and onto the worn area to see how it fitted in the working area. If it was too tight to thread over the full size thread on the end I would consider relieving the end of the leadscrew thread to help, as this portion is not used.

@leybraith3561

16 күн бұрын

@@tates11 ...Agree. I was rather surprised he didn't begin to tap, back it out and check screw fit, when eventually it begins to fit, tap in the other direction doing the same. Likely to have ended up with a far superior fit.... Not conventional, just being practical...

@tates11

16 күн бұрын

@@leybraith3561 A bit gung ho.

I stopped at 6:07 ... How i would tap this is from each end 1/4 of the way in .... then just half way in from each end ..... etc .. until it had nive zero backlash and is not to tight .... In my opinion THAT is why Acme Taps are made this way ... so you can adjust the fit by making a custom cross feed nut, not a general use standard size nut. OK I continue watching :)

@specialks1953

16 күн бұрын

I think the lead screw is worn causing the slop also. I think in the end, the few tight threads in the middle would snug the backlash. It would be temporary but if he does not use it much, that may get him far down the road with tighter tolerances. If tolerances are that important to him he can buy more Nuts to do the same with.

@cdrive5757

16 күн бұрын

Isn't that contrary to the "Never back out an Acme Tap" rule? Wakodahatchee Chris

Could you put the nut in a hydraulic press to compress the pitch?

@LuggageStardate

16 күн бұрын

Soon as he stuck it in a vise I was thinking I would crush it.

@SeeSaw72

16 күн бұрын

@@LuggageStardate Use a hydraulic hose crimping machine with the appropriate die, it might help. Just a thought.

Adam I bet the lead screw was threaded with the step one tap which cuts most of the Acme thread and you used the finishing or full thread depth tap to clean it up. I ran into this some years back. Best wishes Eric

Which tap holder are you using?

@kindablue1959

16 күн бұрын

Hes says at 7:35

@tates11

16 күн бұрын

Lol

have you considered trying a "Chicago Fit"? it looks like the old one had a bunch of them...

@user-ev1bi3jh2f

16 күн бұрын

I thought the same.

@donsfromnz6515

16 күн бұрын

even applying a measured force on the old nut in the press would have been better than cutting the new nut to fit the non worn part of the screw

That was boring AF... BUT you somehow made this exciting 🙂

@stephenk79-rc1il

16 күн бұрын

He is very talented at that.

I use it diluted with water.

I have seen quality improving steeply on chinese cutting tools in the last years. I cannot point obvious difference between name brands (OSG, Dormer, Magafor) in the last two years. Things are very different from 10+ years ago, when they were really poor.

@nils1953

16 күн бұрын

It's still very hit or miss I feel. Sometimes you get actual razor sharp carbide tools and other times, it says carbide but turns out to be softer than lead. But all in all I'd agree, that they've been producing very decent tools, taps and endmills, especially for the home/hobbyist shop. I've only had bad luck with inserts for the lathe or mill though.

@RobertBrown-lf8yq

13 күн бұрын

@@nils1953 I’ve found that cutting tools, collets, Toolholders from India to be superior quality than most of the Chinese stuff. Robert

@nils1953

13 күн бұрын

@@RobertBrown-lf8yq that's very interesting! Where do you buy tools from India? I don't think I've ever used any tools made from there.

@RobertBrown-lf8yq

13 күн бұрын

@@nils1953 I got onto it via Google. Got some 5C collets from them. Bloody first class….. not one burr 😱 So ordered some square and hex collets. Delivery was about six-seven weeks ( probably a special order ??). Ditto for some BT30 ER32 toolholders. I’ll see if I can find their details again and post here.

hey Adam whats the difference in right hand taps an left handed isw it the cutting edge

@michaelleskoske7723

16 күн бұрын

The difference is also in the direction of the threading. Regular thread "right tighty, lefty loosey". Left hand thread is just the opposite.

Long live the Monarch Leath

I think the only way to get the slop out, or get it down to 0.001 would be to replace the acme lead screw with a ball screw.

@car9167

16 күн бұрын

There are disadvantages with ball screws on this configuration. Left hand ball screws tend to be more expensive. The nut size will be much bigger. The max thrusting force is smaller since ball contact surface is much smaller. The smaller the thread pitch the smaller the balls. 10TPI si about 2.5mm thread pitch. It's hard to have a ball screw with this small thread pitch.

@car9167

16 күн бұрын

A better solution which I implemented on my lathe (although metric thread) is a split nut. Actually two nuts. One is fixed to the top slide and one is floating. One face of the floating nut is milled at 2 degree angle in relation with the nut axis. The fixed nut has 4 dowel pins in the corners which goes into the floating nut to keep it aligned. Between the two nuts it's a wedge which is adjusted with a set screw from above top slide. The bottom of the wedge is pushed up with a leaf spring mounted on the fixed nut. You adjust the backlash from above - no need to dissasemble anything - by adjusting the set screw. It will push the wedge down against the leaf spring and spread apart the two nuts creating pressure on the opposite thread flanks. I have 0 backlash on my lathe for the reason I put a 1 micron glass scale and DRO

You could always make a new lead screw too for a long time viewer. Just saying. It's hard to find these old parts.

@TheMoody876

16 күн бұрын

Got that right I need it for my old atlas 10in lathe

@ronnydowdy7432

16 күн бұрын

@@TheMoody876 Made Adam will have time to work on it. Never hurts to ask.

@TheMoody876

16 күн бұрын

@ronnydowdy7432 to me it would be more cost effective to sell the atlas and buy something larger and more accurate

@ronnydowdy7432

15 күн бұрын

@@TheMoody876 okay. Then you should do that if you can.

You can see someone peened the original nut to "improve" the thread fit, sort of like you might peen a shaft to make a bearing fit tighter. You can bet that nuts been worn out a long time.

I think if he's rebuilding it , he would have also replaced the main threaded screw for the machine also to ensure it was right. He could of gotten a nice one built by you.

Is it an advantage or disadvantage to run a tap through both directions ??

@firesurfer

17 күн бұрын

It really shouldn't matter, but it depends on the size of the object and whether you were able to completely pass the full threads. You risk reaming the threads a tad by repeated passes.

Its only backlash

I think it's safe to say that a new screw would have had less play as well. 0.015" wouldn't have bothered me. Not my call though.

Can i send you my Southbend leadscrew and you rebuild mine for me lol

@ConcertLD

17 күн бұрын

My Southbend lathe has some cool history it was originally built and sold to the Keebler cookie company

I am a furniture maker and a novice machinist. I have been watching your channel for a long time and I learn a lot about tight tolerances from you. I do know that leadscrews need some backlash, so what is acceptable backlash and would a better known brand of tap cut the thread with less backlash or would cutting the threads on a lathe be the only way to manage the backlash?

@joansparky4439

13 күн бұрын

backlash is inherent to threads, otherwise they bind and can't be 'threaded'.. to get backlash out of this mechanism it requires a 2nd nut that is being put under adjustable tension / pressure axially to get backlash minimized to near zero and to be able to readjust once things have worn and get sloppy again.. the cheap version of this is to cut perpendicular into the nut without parting it off and using that as the 2nd nut (needs a way to bend it slightly then, usually with a set screw pushing into the cut).

Was that a left handed thread really?

This video shows why. I like this channel. Adam _correctly_ measured the diameter, doing it as though there was nothing to it. Assume the lathe owner is ordinarily competent, and his mismeasure demonstrates that it takes _high_ skill to get that diameter correct.

@Spectrum184

17 күн бұрын

Measuring an OD with calipers is trivial. Any machinist should be able to do it drunk and blindfolded while in their sleep.

Nobody is buying lathe ,” first thing changing all the nuts and screws” Experimented machinist , “if it didn’t strip, it’s perfectly fine”

Do you think a more expensive tap would have been a better fit

@tristansimonin1376

16 күн бұрын

When you tap something who already has a thread it will be bigger than the first time you tap it, if he made a new nut and tap it with this tap I'm pretty sure there will be much less play

Leadscrew? Isn't that the crossfeed screw?

@RobertBrown-lf8yq

13 күн бұрын

Still a leadscrew. Robert

😀😁😊

New intro music....🤔

Won't clamping it like that risk distort the inside of the nut - surely it would be safer to clamp on the pin?

@boothbytcd6011

16 күн бұрын

He isn't using a hydraulic press. It's just hand tight.

@Da5idc

16 күн бұрын

@@boothbytcd6011 how difficult would it be to clamp it on the pin?

Too bad you didn't measure the backlash at the center of the axle. There the wear is usually maximum. And if that were the case, I would first clean up the lead screw threading by removing a few microns. The nut may then fit without having to use the tap. I still think the backlash is much too high, especially because you only measured it at the unused end of the lead screw.

@reinoaalto9941

17 күн бұрын

yup theres always worn part somewhere depending of use case...

I am thinking along the same lines as @joeromanak8797. I bet the drill size may have been oversized, ?? ( Cool video though. )

@Bob_Adkins

17 күн бұрын

Undersized, right?

@cameronjohnston5748

17 күн бұрын

I don't think the drill has anything to do with it on those type of threads, a square thread is designed to take the force on the face of the thread not on the outside or inside diameters. On angled threads a totally different matter.

@Ben.last.name.

16 күн бұрын

Acme threads are a tapered threadfrom (14.5* per side, 29* inclusive) ​@cameronjohnston5748

The new tapped hole might have been M12

There was nothing gained at all. Lead screws and nuts should be fairly tight when fresh and allow them to wear in. A better approach would be a quality sized tap or manual threading. Measuring the backlash should have been done with the nut static and pushing on the lead screw.

@Drottninggatan2017

16 күн бұрын

Yes, maybe the new nut was high quality and made in such a way to be a tight fit, and now it is ruined?

That nut was made to be tight. n You machine the leadscrew to match the nut. Machining the leadscrew will make the whole screw the size of the worn area. The nut will then work with zero backlash the whole length of the screw!!

@tates11

10 күн бұрын

That makes perfect sense. New to me, but obvious when you think about it. Great comment.

Old music please.

@Kalumbatsch

16 күн бұрын

Or some steel guitar while we're at it. High speed steel guitar!

3turns forward 1 turn back

Not your best video; buy a tap, run it through a pre-made part, see what happens... Maybe you should have engineered a split nut to replace the stock nut.