Had a bad thing happen yesterday - my 3-jaw, which normally is good to
within 0.01 mm TIR, suddenly went awol to 0.05 mm+. Which is why I
didn't check my email, too busy.
Investigation showed that the problem was in the concentricity with
which the 55mm spindle register - the register itself is okay, within
0.002 mm, and the 4-jaw and ER32 chucks still fit tightly - meets the
chuck, and somehow the hole in the chuck had become too big. No idea how
Took 2 mm off the back of the chuck, which reduced the TIR to 0.028mm,
but that's still not good enough. Need a putter-on-er?
Managed to shuffle the chuck enough to accurately drill and ream a 12-
spoke drive sprocke, to replace the 19- spoke socket which came with my
minilathe, giving 54% more low speed torque which I need - plan also to
replace the 300W motor with a 620 W motor too, to give more than 3 times
the low-speed torque - but still left the chuck problem unsolved. Though
I do have an idea, but can't do it till next month..
Oh, and today I watched the repairmen eventually replace my kitchen
window, and finally sorted out the last issues about licensing my
LOX/paraffin rocket motor - so it was quite a good day overall :)
<still not sober>
-- Peter Fairbrother
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