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From: "Jim Wilkins" <muratlanne@gmail.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: Making a Screwless Vise
Date: Tue, 27 May 2025 18:57:03 -0400
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"Bob La Londe"  wrote in message news:1014rbu$2n8jb$1@dont-email.me...

I am sure of some of you (particularly old school employed machinists)
made one during your apprenticeship. ...

--------------------------------

I did, part of a milling attachment for my AA lathe before I found better. 
Shoulder screws in shear as dowel pins attached the fixed and movable jaws 
to the flat vise bed. Setscrews passing through the movable jaw clamped the 
work. Drilling, tapping and counterboring the vise bed was pretty easy on 
the school's Bridgeport. The back of the vise bed is the dovetail for the 
vertical slide. It was rigid enough for the intended use with aluminum and 
plastic, as the AA lathe can't cut much steel.

The AA is still useful, I cut off the 1/4" HSS threading bit for the jack 
adapter ID in the 4-jaw with a Dremel and cutoff wheel on the carriage. The 
SB has hardened ways, so no grinding on it.

For the carbide grinder project I cleared some space by moving out a 3 phase 
1/2HP 220V pedestal grinder that was part of an auction mixed lot I bought 
for the scaffolding, for $10. The megger I acquired later showed its 
insulation safe to 500V, worth checking with discarded motors. The 
connection that made it run as a test was AC from a 0-280V Variac on two 
leads with a 12uF motor run cap to the third. At around 120V and 4A it spun 
slowly and gradually accelerated until suddenly taking off to normal speed, 
where the current fell almost to zero. That's not a proper static converter 
but it was enough to test the motor and bearings.