Another piece for the lab tech's positioner. I ran a tap through the nuts and a hone through the bore. Whenever you weld a nut on, the weld causes the threads to tighten up. Chasing the threads with a tap takes care of that. Likewise, welding the nuts and the plates will cause some distortion on the pipe, the hone took care of that.
After cleaning up the piece for the positioner yesterday, I started making two more brackets for mounting the quick-change under the jitney. I got about halfway through the piece with the hole saw and then the arbor for the drill chuck broke. As you can see from the photo, the broken end is down in the chuck about 1/4" - deep enough I didn't want to risk screwing up the threads welding something on to the stub stuck down in there. I drilled a hole in it with a left-hand bit as the first step, hoping it would catch and back the stub out. Tried an Eazy-Out next. No luck there either. I finally put it back on the mill and very carefully opened up the hole with a milling cutter until there was just a paper-thin wall on the stub left in the hole and then ran a tap down in there and cleaned up the threads. So the chuck is OK, but I need to make another arbor. Not much to that, just another minor setback on the project list.
Happy Easter!
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