06-14-2021, 07:10 PM
A forum member made me a brass bushing to take up some of the slop between the vise screw and the movable jaw. It worked for a while but eventually worked itself loose and fell inside the casting. He made it to my drawing but I gave him bad dimensions. I wanted a press fit into the hole but my dimension on the drawing wasn't quite correct.
I found a bronze flanged bushing in my box of miscellaneous stuff and got lucky. The ID was .75" which is close enough to 19mm to work. The OD was .875" and needed to be turned down to .821" to fit the hole in the movable jaw. I made a mandrel planning on making the bushing a snug press fit on it so I could machine it using light cuts. I shouldn't have taken that last bit off of the OD of the mandrel.
So I went with plan B and drilled and tapped the mandrel 1/4-20 and countersunk the hole for a flat head screw. Then I cut a slit down the middle to basically make an expanding mandrel. Worked well and I got the bushing OD turned down to withing .0005" of my target. I then had to face off about .035" from the flange in order for the castle nut to line up with the hole for the cotter pin without the vise screw being too hard to turn, it needs some slack.
Ed
I found a bronze flanged bushing in my box of miscellaneous stuff and got lucky. The ID was .75" which is close enough to 19mm to work. The OD was .875" and needed to be turned down to .821" to fit the hole in the movable jaw. I made a mandrel planning on making the bushing a snug press fit on it so I could machine it using light cuts. I shouldn't have taken that last bit off of the OD of the mandrel.
So I went with plan B and drilled and tapped the mandrel 1/4-20 and countersunk the hole for a flat head screw. Then I cut a slit down the middle to basically make an expanding mandrel. Worked well and I got the bushing OD turned down to withing .0005" of my target. I then had to face off about .035" from the flange in order for the castle nut to line up with the hole for the cotter pin without the vise screw being too hard to turn, it needs some slack.
Ed