I did some sanity checks previously to convince(?) myself I'd be able to fit the yoke in the lathe on the faceplate without hitting the bed. It was obviously goiug to be pretty tight and sure enough it was....
Used my generic camp set to pin the thing down, then used my Baty 10um DTI and a soft mallet to tap it into place. It was within 50um or so, although the bore was pretty rough and there's a big keyway to content with.
It's almost impossible to set stuff like this up on the lathe. You need to get it pretty close on the bench and then finally tap it into position on the lathe with the DTI and a mallet:
Looks pretty close to central, peering down the bore at the hole in the faceplate:
Looks workable:
Nicely set up now. Clears the bed and the saddle but what about the tool? I don't have anything that long.
Only one way to do this - MIG welding a shitty boring bar to a piece of BMS:
Setting the tool to centre height
What could possibly go wrong?
Let's start to cut some metal:
This is the double ballnut. It actually measures pretty much bang on 40mm dia.
Bit of an overhang but should work
Stand back!
Under way:
Checking the bore:
Face off the rough cast end of the X axis. This will allow me a choice of which side to fit the flange to. Might be useful later.
This end is done:
Now turn it round and set up the Y axis bore:
I got it set up without too much dicking about. Spaced from the faceplate with some hex nuts. The yellow flange is actually a mm or so clear of the faceplate, so the bore is held perpendicular to the faceplate by the machined end face.
Not a lot of clearance to the cross slide or saddle:
Not a lot of room at the back and bottom of the tool - but enough
Finished dimension, 110um oversize:
Acid test, now that it's come off the faceplate. Y axis bore:
X axis bore:
Next task - swap the ballnut round so the flange is at the other ("front") side of the yoke. That could go horribly wrong too!
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