Author Topic: A boring table for a Craftsman 12" lathe  (Read 26081 times)

Offline vtsteam

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Re: A boring table for a Craftsman 12" lathe
« Reply #75 on: September 11, 2013, 09:30:17 PM »
Thank you gentlemen!  :beer: The table itself was easy, by comparison!


This threading exercise has got me thinking about it still.

Here's one idea I'm wondering about:

Now I used the cutting method where the topslide is set over to the half angle. Ostensibly that reduces the wedging action of the cutter for our smaller lathes, and allows them to cut on the leading edge of the cutter and the tip (in an acme thread).

I was using a turned cutter profile. It has no relief under that forward edge. And the interior groove it is cutting presumably bears hard against that lack of relief, since the angle of the thread goes aft and under the cutter. Relief here would need to be pretty steep to even just parallel the thread edge.

The topslide was set over 14-1/2 degrees towards the headstock -- because you gradually withdraw the topslide to cut the thread.

Now what would happen if I had angled the topslide the same amount but in the opposite direction? Wouldn't that cut easier, because the trailing edge presents the opposite situation -- automatic relief in relation to the square cutter edge? Can you cut on the back side of a threading tool vs the front?

questions, questions........

I love it when a Plan B comes together!
Steve
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Offline vtsteam

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Re: A boring table for a Craftsman 12" lathe
« Reply #76 on: September 11, 2013, 09:35:20 PM »
(I built a lathe sharpening fixture for a disk sander at this point -- which went on for quite a few posts -- that has been moved to a separate thread here: http://madmodder.net/index.php/topic,9051.0.html . I'll finish up the boring table project here.)
« Last Edit: September 16, 2013, 10:27:34 PM by vtsteam »
I love it when a Plan B comes together!
Steve
www.sredmond.com

Offline vtsteam

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Re: A boring table for a Craftsman 12" lathe
« Reply #77 on: January 07, 2018, 10:55:13 PM »
Restored the photos in this thread which had broken links due to Photobucket.
I love it when a Plan B comes together!
Steve
www.sredmond.com