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- Sep 28, 2013
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- 4,306
Hi all,
I need to put 2 new bushings in the spindle pulley of my Atlas 618. Problem is the bore of the olite bushings I have is 20.10mm and I'm shooting for an ID of 20.00-20.02mm, as the spindle where the bushings will run is 19.99mm chuck end and 19.97mm at the gears end. I bored the temporary pulley to 20.02mm which was a nice sliding fit with a smidgeon of play (by tilting the pulley, no radial play I could feel), which gives me a good number to shoot for on the bushings.
OD of the bushing is 24.00mm and the OD of the pulley where the pushing will be pressed in is ~35mm. Current ID of the pulley is 35.36mm give or take.
The previous bushings aren't any help as one was a very light press fit (if that, I think it spun a bit) and the other was glued in, which may have been the cause for the off-centricity of the pulley.
Anyway. Q is - what do I need to bore the ID of the pulley to in order to squeeze the bushing ID down from 20.10mm to 20.00-20.02mm? I can try shrink fitting (have access to dry ice) or press fitting on my press, although I don't want to risk cracking the pulley. I'd rather avoid any post operations if possible, as I've heard that olite is hard to cut cleanly and still retain it's bearing ability. Plus it'd be another opportunity to screw up the concentricity of the bore and pulley face.
thanks!
I need to put 2 new bushings in the spindle pulley of my Atlas 618. Problem is the bore of the olite bushings I have is 20.10mm and I'm shooting for an ID of 20.00-20.02mm, as the spindle where the bushings will run is 19.99mm chuck end and 19.97mm at the gears end. I bored the temporary pulley to 20.02mm which was a nice sliding fit with a smidgeon of play (by tilting the pulley, no radial play I could feel), which gives me a good number to shoot for on the bushings.
OD of the bushing is 24.00mm and the OD of the pulley where the pushing will be pressed in is ~35mm. Current ID of the pulley is 35.36mm give or take.
The previous bushings aren't any help as one was a very light press fit (if that, I think it spun a bit) and the other was glued in, which may have been the cause for the off-centricity of the pulley.
Anyway. Q is - what do I need to bore the ID of the pulley to in order to squeeze the bushing ID down from 20.10mm to 20.00-20.02mm? I can try shrink fitting (have access to dry ice) or press fitting on my press, although I don't want to risk cracking the pulley. I'd rather avoid any post operations if possible, as I've heard that olite is hard to cut cleanly and still retain it's bearing ability. Plus it'd be another opportunity to screw up the concentricity of the bore and pulley face.
thanks!