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| Trials and tribulations with a 7x12 lathe |
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| andyf:
If anyone needs the dimensions of the 7x minilathe spindle, Little Machine Shop's drawing is reproduced at http://www.toolsandmods.com/mini-lathe-parts-drawings.html Andy |
| loply:
I believe the original spacers on my spindle were also too small - my replacement bearings were thicker than the originals, yet, I had to make thicker spacers to make them fit with no free play on the gear? Had me confused for ages, I think it's assembled with the upper gear just loose with a spacer to prevent it moving "too much" but it can move back and forth by a bit. It's quite a tight push fit though. May explain why they break so easily. |
| modeldozer:
Thanks guys for the encorragement and link. Bussy with the assembly, but ran into yet another snag :bang: for some reason once the laysaft is installed the bearings end up so tight it hardly turns. Lunchtime here so the ivestigation will start later. Anyone knows where one can find standard press fit data? Abraham |
| dsquire:
modeldozer I believe that information is in the Machinist Handbook. :D Cheers :beer: Don |
| modeldozer:
Hi all, Don, thanks for the reply . Managed to find the bearing fit data on the SKF website. The lay shaft was 0.01mm oversize causing the bearing inners to expand too much and bind. Used my pillar drill and some W&D to carefully reduce the diameter. With the spindle assembled and preloaded I temporarily installed the feed tumbler assembly and main drive to check the length for the rear spacer. Turns out the alignment are good with the current length. All assembled. The headgear was then fitted to the bed and the alignment with the bed ways checked. It has a slight taper both vertical and horizontal (0.04mm over 200mm). At the moment I am busy adjusting this. Abraham |
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