Series on reconditioning a Schaublin 70 lathe

[Mcgyver]

You guys have seen this project before, but I'm trying to stitch it together as a series of videos detailing the steps to recondition it

Part I, the bed

 

[mjautek]

looking forward to the chapters to follow! I'm always so impressed by the quality of your work and I'm very grateful that you share your knowledge...

 

[Mcgyver]

Part II

 

[Susquatch]

Wow Mike. You must love doing that kind of thing...... Absolutely amazing work!

 

[Mcgyver]

Thanks John ..... this lathe almost cured me of it .... wait until you see the self flagellation with a barbed wire cat o' nine, err, the double taper headstock bearing. I'll get a block of cast iron and whittle a new HS before I do that again

 

[PeterT]

@Mcgyver I watched part-II, excellent work!
Was the original tailstock quill hard chromed or was that your decision to make it long lasting & obviously compensate for the increased bore from lapping? Maybe I missed but about how much was lapped off?

 

[Mcgyver]

Thanks Peter, it was not originally hard chromed but was hard irrc. The plating is done just as a way to build up so you can grind it down to fit .... that will wear well is a fringe benefit .... .but if not clean and oiled the bore will wear so you're not out of the woods. Lapping is only done on the bore, quill is ground. I think I ground off 5-8 thou before plating... I noted in video you need to end up with a thick layer of chrome in the end, a thou or so won't work as it will likely flake off.

 

[PeterT]

My other question was how much you figured you lapped out of the tailstock bore. Reason is I found it to be excruciatingly slow process on my radial CI liners. Like 2 thou is a lot

 

[Mcgyver]

I don't know or at least can't remember .... but it wasn't important as it's not lapping to a particular size, its lapping as much is as needed for a straight, round bore.