Gallery, Projects and General > Project Logs
Oh Blimey I bought a CNC Lathe !!!!
awemawson:
So popping it in the chuck having slackened and hand tightened the tool holder bolts it took all of ten minutes to tap the tool mounting block round on it's circular Tee slot to zero out the error, and re-torque the bolts.
I am amazed how accurately you can tap things with a plastic mallet to shift them a few microns. The indicator in this picture shows zero, where full scale either way is 3 microns, which indeed is where I got it at the four quadrant points, but that's a bit deceptive, as the ball screw backlash and indeed just leaning on things moves it a few microns.
Just need to re-pack it with grease and put it back together. The replacement O ring arrived yesterday (3 mm cord by 164 mm id), available on ebay for less than £3 delivered !
awemawson:
So now that the 'tool mounting hole' centre line lies on the axis of the lathe I can tweak the machine parameters to accurately set tool offsets. The value of X in this picture (which I'm putting here so I can refer back in the future :) ) is the absolute position of the X axis to get on centre
Before all the tweaking the value was 137.832, but that difference of 0.152 mm is not all 'X' and not all 'height' as the tool mount has been rotated to zero the error
Pete.:
Neat tool Andrew. With it reading so fine, do you leave any allowance for flex in the holder when turning the probe from 12 to 6 o'clock?
awemawson:
Pete the holder is very stout - obviously there must be flex but frankly plus or minus 10 microns would be absolutely no issue in this situation.
Pete W.:
Hi there, Andrew,
I think I might be able to match that fuse holder if you need to replace it. It might take some digging to find it, though! :scratch: :scratch: :scratch:
If your fuse holder is broken send me a PM with a close-up photo. I do know I've got a few of the type with the 5/8" fine thread fixing nut (I used one of those nuts to load the quill bearings on my Tauco bench drill!) :nrocks: :nrocks: :nrocks:
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