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Re: CMyles, how's you PC? (+) Posted by CMyles [Email]  (#1126) [Profile/Gallery]
(more from CMyles) on Thu, 26 Oct 2006 12:54:46
In Reply to: CMyles, how's you PC? (+), Siegfried, Thu, 26 Oct 2006 10:45:17 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Siegried,
Yep, a new motherboard and CPU did the trick. As I've stated the goal with the input assembly is to have zero preload and zero axial freeplay. Given the fine tolerences with which bearings are made these days these results will generally occur if one simply re-uses the spacer and shims which were in the assembly. A process for setting up an input assembly "from scratch" would be; Press the new OUTER races fully into the housing then hold the INNER bearings in place without the shaft or shims. Measure across the outer-most bearing faces of the assembly then disassemble and measure the width of the INNER bearing race (just the race, not the rollers or cage). The first measurement (overall dimension) minus twice the inner race width provides the gap between the two inner races (call that the "derived dimension"), which ultimately will be filled with a spacer and shims. NEXT, assemble the entire assembly using a spacer and shim pack which is about 1.0 mm thicker than the "derived dimension". Using the appropriate mandrels squeeze the assembly in a press or large vice so as to remove any gap between the INNER bearings,spacer and shims. While so squeezed measure the axial free motion of the aluminum housing with a dial indicator gauge, in tenths of a millimeter. You would expect that measurement to be 1.0 mm since that is what you added to the "derived dimension" but it will probably be slightly different. This measurement of the axial free motion is the amount to reduce the shim pack by, thus removing that axial free motion precisely. Once re-assembled with the final shim pack, while in the press (or vice), you should be able to spin the housing freely yet feel no axial play. That is a subjective assessment of course but it's quite good enough for our purposes. You should err on the side of having a tiny pre-load rather than any axial free motion. Also, a few drops of light oil on the bearings is advisable during these procedures and watch out for shims sticking to the bearings and thus getting misplaced during disassembly.
Sorry but I'm not very good at discussing these things on the phone. Continue on this BB and I'll be glad to help where I can. Cheers.
posted by 206.123.221...
, Thu, 26 Oct 2006 12:54:46 <-- Viewing This Message, Thu, 26 Oct 2006 13:04:49
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