Knocked out another small one!
I've been working on a straight edge for my old Whitney bench shear for a while. I made a bar, drilled and tapped the shear and picked up some shoulder bolts. Unfortunately between inaccuracies from the hole drilling, when the bar was bolted on it was well out of square.
It was maybe 3/16" out of square over 6 inches. I didn't feel like grinding it so I used the milling attachment on the lathe. I just worked to a scribed line, no indication at all.
As far as milling set ups go this is probably in the "Do not do" section of the machinist handbook. Because i had such limited cross slide travel I had to let over half the part float out in space with no support. It actually went very well though. I took very light cuts.
This is what I was aiming for. Straight edge guide for the shear.
The bar has a tiny bit of play when bolted on. Even though I used shoulder bolts and reamed the holes to 0.375". After it snugged it onto the shear I started making test cuts in some 16ga scrap, making micro adjustments with a dead blow hammer.
It came in pretty darned close to perfect!
Youtuber This Old Tony made a similar modification to a bench shear where he milled the shear body down and made a nice perfectly flat table to hold the stock you're cutting. I like the idea but I don't have the equipment to make that cut. In my case the shear body tapers downward slightly to the left as you stand in front of it. It'd be nice if it were flat though.