A Different Way to Repair a Worn Lead Screw

Nice fix. I think I would have ordered an appropriately longer acme screw and turned new ends on it.

Kyle, I like what you are showing. My understanding of using telescoping gages shown to me by an old timer (my grandfather) is to insert the gage at a slight angle, tighten the anvil just enough to hold it , and slowly rock the gage til you feel it clear the diameter. This is much more accurate.

Totally legit repair. There were some cool things to lean here despite the fact you could have turned it down from a larger screw. Anything you do on that gorgeous Colchester is worth my time.

Totally legit fix. There are always more ways than one to skin the cat. It’s as accurate and strong as new or a turned down acme screw as others preferred. Suspect there were features on the screw you didn’t want to have to perfectly recreate - so this gave you the accuracy you wanted without having to do so. Only suggestion: no reason at all not to have heated the female before press fit. Simple torch woulda sufficed. That would have bought some insurance against galling when pressing. Your method worked fine in the end - but just a little torch work might have bought you some safety margin. Thanks for posting.

Once you've reached the maximum travel of the carriage, you can measure the remaining length using a caliper.

Made in a day, labour, $100 hr +, =$800, + part cost, that $300 is looking pretty sweet now.😉 However, GREAT REPAIR and an EXCELLENT teaching video on a repair, well done and thank you.

Nice work! As you said, there are many ways to make that repair. But, I'm wondering about wearing gloves around revolving spindles?

you would be surprised by how many medium size machine shops rely on a tape measure for measuring long parts like that to hold a .030 tolerance.

This would be a good application to use a tapered pin rather than split pin. Having a few common size tapered reamers is a good investment.

so it took you a hole day what do you charge for a days work ? in my place of work a day is 800+

Very interesting. Thank you. Wearing gloves on a lathe is surely a no-no. Scratch pass = spring pass? If consistency of thread wear is the important thing, surely the cheapest and quickest repair is to recut the thread and then use the split nut to take up the slack?

29:25 Gloves with the lathe on, near a thread with a HUGE open burr on the end, just insane. AND wrapping the emery cloth all the way around the work, hoo baby. You live pretty dangerously!

Excellent repair man..nice job.

I did much the same thing as an apprentice 40 years ago for our Cincinnati mill. Here in new Zealand it wasnt so easy to get an acme threaded rod or my boss was to tight to buy it so I had to cut the new lead screw thread myself in the old Colchester master (If I remember correctly) I chose this way to repair as one end had a spline and I had no means to replicate it. Nice job

As your ends are already press fit, I would stick to a quarter inch hole for my spring pin. Good videography and no music (noise). I like it! Subscribed.

Looks like you did a very good job it looks like it turned out very good so keep up the good work and I will keep watching god bless

Beautiful machine man

I think you did great man .. I watched Abom79 repair a lead screw and he went about it different but yours is just as nice and just as strong .. Just subbed up to your channel ..👍👍

Great Job.👍👍👍

I enjoyed the repair too. I am a word nerd as well as a machine repair technician. I insisted that my repair staff use correct terminology. So I cringed every time you called the screw a shaft and when you called the split nut a bushing. Your bearing splitter arbor press setup was a clever idea. I think that I would have flipped the splitter so that press load would be against a square shoulder.