The Craftmans Shop > New from Old
The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
awemawson:
Big O ring still not arrived so I decided to modify the drawing for the spanner that I made for the axial powered tooling to incorporate an opening at the 'other' end to fit the locking flats on the 90 degree holder.
After an initial oddity in Autocad where an unwanted circle wasn't displayed, yet was in SheetCAM, solved by "Eagle Eyes" David Judd who spotted a minute dot in the drawing that for some reason, like a collapsing black hole, the circle was compressed into - the spanner is made.
Actually it took more fettling than it should have - my drawing obviously wasn't spot on
awemawson:
At long last the rather odd sized O ring arrived - (well actually a bag of ten of them !). I strongly suspect that the original would have been fine, but whilst things are apart it's best to do a proper job I reckon.
So, swiftly the capping was re-assembled and the unit re-installed. It's running a 'soak test' as I type.
As far as the turret goes all that remains now is to be brave enough to replace all the tin work - superstitious I know but I reckon that the chance of the turret giving me more problems will probably increase tenfold when the covers are back on !
awemawson:
This morning I re-installed the tin work on the turret. Went reasonably well considering the contortions needed for screw access :thumbup:
So all back together and I did a trial test of the powered tooling, which revealed a nasty rubbing noise that hadn't been there before the panels went back :bang:
Rubbing noise associated with the rotation of the powered tooling - drive shaft or drive belt fouling :scratch:
So the smallest of the covers that covers the powered tooling shaft and drive, which fortunately can come off without disturbing the other ones, had to be removed. This revealed that the end of the hub of the toothed belt pulley on the shaft was rubbing on the vertical face of the cover. I'm not really surprised at this, as this panel had obviously suffered badly in a crash under the previous owner, and I'd had to rather guess what shape it needed to be !
Need to decide on a work-around, but not now, it's time for lunch :ddb:
awemawson:
Fortunately, by elongating the 6 mm mounting holes slightly, and biasing the cover towards the tail stock as I tightened the screws, I was able to get just sufficient clearance for the pulley hub not to rub. It is mighty close though.
If my sheet metal work skills were better I'd be tempted to make a completely new cover about 10 mm longer to give adequate clearance, as this one is pretty bashed about and wouldn't win any beauty contests ! But it is a very awkward shape to fabricate with lots of odd angles.
I've heard from the lost wax caster - apparently both drive dogs have come out OK, so that's good news but I've yet to see them.
vintageandclassicrepairs:
Hi Andrew,
What about cutting out the damaged section and welding in a new piece?
John
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