- Thread starter Brad93
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Brad93
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For anyone with a Mk1 Beaver Mill wondering what size the belts are.
The toothed belt that drives back gear is a Gates PowerGrip 3 490DS 210L100
The v belt that runs between spindle step pulley and motor step pulley is Gates A890V. I believe the common denomination size is A34 13x875
The toothed belt that drives back gear is a Gates PowerGrip 3 490DS 210L100
The v belt that runs between spindle step pulley and motor step pulley is Gates A890V. I believe the common denomination size is A34 13x875
Brad93
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- 19,416
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- Essex, United Kingdom
Hopefully this helps someone on the far flung internet.
The spindle pulley bearings are a pair of RHP Angular Contacts with brass cages.
LJT1.5/8"
I paid £78 each plus VAT each from Essex bearings. Again new old stock RHP.
The backgear (high/low) gear is also on a set of RHP angular contacts. LJT1.3/8
I paid £60 odd quid plus vat each from Essex bearings. Again, new old stock RHP.
Along with the backgear there is a countershaft, that runs on a pair of 6205 metric bearings.
This shaft is an absolute pig to remove. You need a slide hammer to get it out.
Thinking about it now. You could do away with the back gear by using a VFD. It would require thought and machining but it could prove a reliable and quiet method while retaining the step pulleys.
With all the new bearings the pulley and backgear themselves are very quiet. But the mechanism for moving the back gear up and down is constantly running in a groove on the backgear and that creates noise.
The mill is now all back together and I've got a few small issues to fix, missing ball knobs, two drilled handle shafts to replace and the sensitivity of the downfeed knock off to adjust.
Also I still haven't got round to making something work for the splined shafts that raise the knee and tilt the head.
I'm leaning towards modifying the tilt shafts to hex's so that a simple spanner will suffice.
The spindle pulley bearings are a pair of RHP Angular Contacts with brass cages.
LJT1.5/8"
I paid £78 each plus VAT each from Essex bearings. Again new old stock RHP.
The backgear (high/low) gear is also on a set of RHP angular contacts. LJT1.3/8
I paid £60 odd quid plus vat each from Essex bearings. Again, new old stock RHP.
Along with the backgear there is a countershaft, that runs on a pair of 6205 metric bearings.
This shaft is an absolute pig to remove. You need a slide hammer to get it out.
Thinking about it now. You could do away with the back gear by using a VFD. It would require thought and machining but it could prove a reliable and quiet method while retaining the step pulleys.
With all the new bearings the pulley and backgear themselves are very quiet. But the mechanism for moving the back gear up and down is constantly running in a groove on the backgear and that creates noise.
The mill is now all back together and I've got a few small issues to fix, missing ball knobs, two drilled handle shafts to replace and the sensitivity of the downfeed knock off to adjust.
Also I still haven't got round to making something work for the splined shafts that raise the knee and tilt the head.
I'm leaning towards modifying the tilt shafts to hex's so that a simple spanner will suffice.
