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Lathe build project

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PK:
Thinking...thinking... That's actually a really clever way to do it.
99% of my thread turning is either 1.25mm/1mm/0.75mm pitch and I always leave the half nuts locked and run backwards.... I could just have three reference screws. It's a lot simpler than a gearbox...

Thanks for the post!

awemawson:
Yes Denis Chaddock described a follower for grinding threads on the shanks of end mills on the Quorn T&C grinder

Fergus OMore:
Steve

Fascinating stuff- thank you.

I'm desperately trying to get my aged head around a new U2 Asiatic clone of a Deckel tool and cutter grinder to counter senile dementia.

Kind regards

Norman

Again- thanks Andy. The grey matter isn't as addled as I imagined

N

NormanV:
I've had a boring afternoon. :D
I have been given a tailstock ram for a Myford lathe (thank you so much Kayzed1) that is slightly larger than the one that I was making. Which meant that I had to bore out my tailstock casting to fit. As I am rotating the lathe by hand it took a long time, especially where the split cotter is situated. That took a bit of effort to turn the mandrel as the cotter is steel and the tailstock is aluminium.
Anyway, it is done and I didn't go oversize as I had feared. All I need to do now is to hone the hole to make it a perfect fit.
Here is my boring set up, I've shown it before but this is from the other end and shows my temporary tailstock. I used the saddle to push the tailstock along. Steve, (VTsteam) will recognise the method as it is how Dave Gingery showed to do it to build his lathe.

vtsteam:
You're welcome PK. I can't tell you how many times I've looked at that photograph -- copied off the internet 15 years ago -- I don't remember where. It took a long time to figure out what was what. I'm still tempted to add it to my old Gingery lathe.  :coffee:

But for now, working on the new lathe.  :dremel:

And Norman(s) here's one more possible method for thread cutting without change gears... uh I guess you'd call it the pantograph method:



Slightly more information here:

http://www.jacquesmaurel.com/machining

I found a copy of the referenced Model Engineer (4270, April 2006) on ebay and sent for it. But it will apparently be two weeks or more getting here from UK shores. I'd appreciate it if someone could send me a copy of the article before that. -- though I had worked out and tested an electronic change gear system for my new lathe, I think I would prefer the mechanical simplification of something like this. Plus I think it's really cool.  :dremel:

Norman (Fergus) sounds like a good use of time to me! :beer:

Norman (lathe builder) Yes indeedy, that boring method is familiar -- bored my Gingery headstock and tailstock that way, and will do it again on the new lathe. With the weird reversal that I already have a tailstock bore and will use that to bore the headstock. Either way, they come out the same Z and Y axis position on the ways, parallel and concentric, which is the point!  :ddb:

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