Supporting > Tooling & Machines

Chuck backstop for Sherline, per GH Thomas design

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gerritv:
I am making a lot of small nuts and need to set them one by one in the 3 jaw, precisely located. A back stop was needed so I adapted GH Thomas' design from Model Engineers Workshop Manual.

No drawings, it was 'made to fit' in both the materials at hand and the lathe itself.
The tips are replaceable, depending on the thread size of the nut. Another adapter will get made if I need to back stop larger parts.

the only modification to the Sherline was to grind away the first (inner) tooth on the jaws of the 3 jaw chuck. This particular one already had some damage to the jaws so didn't risk much in doing so.

Works a treat, esp. in conjunction with the Lever Cross Slide.

gerrit

AVTUR:
Lever cross slide? I guess it is obvious but I know nothing about the Sherline lathe.

I doubt if one could be fitted to a Cowells.

AVTUR

Dave Otto:
I'm confused, are we looking at two different stops or do these two assemblies work together? It appears that the upper one has a taper on it, does that match the spindle taper?
I don't have the book. :)

Thanks
Dave

gerritv:
This thread shows the lever cross slide on a Sherline lathe. No reason why the design can't be adapted to a Cowells.
https://www.modelenginemaker.com/index.php/topic,12088.0.html

Gerrit

gerritv:

--- Quote from: Dave Otto on December 02, 2024, 08:24:37 PM ---I'm confused, are we looking at two different stops or do these two assemblies work together? It appears that the upper one has a taper on it, does that match the spindle taper?
I don't have the book. :)

Thanks
Dave

--- End quote ---

The taper portion fits into the spindle and is locked in place. (MT1 taper), the threaded rod slides into that, using the 2 nuts on the end you can set the depth. The RH tip insert is, in my case, for M3 threads in a hex nut blank.The step on that insert lets you set the nut square, tighten the chuck, withdraw the threaded rod to inside of taper and then machine the end of the nut as well as tap it.

gerrit

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