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| Trials and tribulations with a 7x12 lathe |
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| loply:
I've got the same problem with my saddle! Will be interested to know how you get on fixing it. My gib strip on the side of the 'vee' is not as tight as the opposite one, because I was led to believe it was less critical, but I believe this may be causing the rotation. I note that if I push the saddle down above the vee that the rotation seems to become impossible. Are you saying that even with really tight gibs you can still rotate it though? |
| modeldozer:
Yes, even so tight it can not move it has 0.01mm rotation, this is why I think the V in the saddle might need a remachine. |
| andyf:
You may find some help on sorting out the Vee both here http://www.toolsandmods.com/saddle.html and on the link it gives to Marty Nissen's work. Andy |
| loply:
Provided the angle of the V is precisely 90, I can't see how it should end up rotating? Because it's a V it clearly can't be oversized or undersized, and I can't imagine the sides of the V not being parallel? I agree that lapping it is probably the solution but would be interested to know exactly what the problem is. |
| modeldozer:
Hi again to all, Andy and Loply, The saddle have been lapped is as Jose at toolandmods decribes. Conclutions at this tine is at the end of this post. A bit more progress. Made a “shim” for the rack from some 1mm sheet. Filed a recess for the pinion in the front gib. Shortened a grub screw to fit under the pinion. Made a new full chip guard for the apron gears. Also made a thrust washer to prevent the gear eating into the guard. All fitted. The saddle was then adjusted for a slightly dragging fit and play checked with a DI. Up/down with oil on the ways 0.0000 but then found the rotational play mentioned before. Today only had little time in the shed and the saddle contact with the ways was rechecked with mechanics blue, both sides on the “V” have full contact over the complete with of the saddle, so I am thinking the play is just inherent (Not ridgit enough) of the design. Will continue on for the moment and see how this affects turning. All for now Abraham |
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