| Gallery, Projects and General > How do I?? |
| Fix for Gib twist on mini lathe. |
| (1/3) > >> |
| ian_in_the_midlands:
My new mini lathe suffers badly from the gibs twisting. I see from other posts, this is not uncommon. The compound slide it the worst. As the gib twists it raises the slide and fouls the leadscrew. I have replace the adjusters with cone points, with little effect. I have been recommended to drill and tap the cross slide for more adjusters. am reluctant to do this first as the holes would have to be very close to the edge of the metal, and I have a very wobbly pillar drill. Has anyone done this? Does it fix the twist problem. Can someone supply more details of the fix: position of new holes, pictures of drilling, angle of holes etc? My first attempt to fix the problems will be to make better fitting jibs. I have no milling machine, so they will have to be filed by hand. I have some brass and key steel I could use. Brass would be easier to file, and kinder on breaking in my new files, but I have read that using a softer material for gibs can cause them to pick up abrasives and turn into a lap that wears the lathe. Is this an issue? Would people recommend I use brass or steel? Can I also confirm my understanding of how a gib should work: - The gib should be a good fit in the hole, unlike the gibs supplied. - The slide should ride on face F. - There should be full contact on face A. - The gib can contact at B, but fit is not critical. - There should be clearance at C and E. - The gap at D should be as small as possible. Thanks. |
| Pete.:
Can I also confirm my understanding of how a gib should work: - The gib should be a good fit in the hole, unlike the gibs supplied. - Yes - The slide should ride on face F. - Yes - There should be full contact on face A. - Yes - The gib can contact at B, but fit is not critical. You need a small clearance. - There should be clearance at C and E. No, the gib should ride on C, clearance at E - The gap at D should be as small as possible. Ideally, yes |
| John Rudd:
FWIW, I changed the gib strips on my Sieg lathe for brass ones.....Not had a problem thus far.. |
| Brass_Machine:
Hi Ian, Save your time and buy the brass gibs from one of the suppliers. I plan to order a set soon myself. I figure $29usd will be worth it for my time. In the US get them HERE. In the UK you can get them HERE at the bottom of the page. Eric |
| John Swift:
Hi Ian fitting the brass gibbs from Arc made it possible to part off without the parting tool diving under the workpeice the originals were under size and looked like they had been hacked out of a piece of slag these pictures are not great but should give you an idea of how close a fit the new gibbs are John |
| Navigation |
| Message Index |
| Next page |