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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by AdeV on Today at 09:12:42 PM »OK last resort - what does the drawing say ? Well the only drawing that I have is from the Patent Application so may not be 'as built' but here it is:
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Now to me that is clear as mud. I can see the large bolts screwing into the outer half of the front curvic coupling allowing for a bit of rotational adjustment (as I have previously done). But the ten smaller bolts from the way that I'm reading the drawing don't seem to do anything.
I've retreated for more head scratching.
As best I can tell, and I'm not much cop at interpreting those kind of drawings either...
The smaller bolts look exactly like the pattern that typically holds a car flywheel to the crankshaft. My best guess would be that if you undo and remove them all, you then screw bolts into the two holes top & bottom & use them to push the whole front piece off. Or maybe just the middle comes out, since the drawing shows all the bolts flush with the same surface, but neither physical unit matches that (the centre bolts being further in). Best guess, the big outer bolts are holding the coupling together (with,as you say, enough play to make minor radial adjustments), the inner bolts are what's holding it together. Probably gravity isn't strong enough to overcome the sticktion between the two parts, hence the push-it-out bolt holes in the centre portion.
Should be easy enough to test the theory - loosen the inner bolts, screw a bolt into one of the things you suggested might be for a slide hammer, and see if a) it bottoms out and b) if so, that it does indeed dislodge the coupling.
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what is this thing made of, solid uranium to judge by it's weight.
looks like you got your work cut out there Andrew..........Carry on!... 