Hbjj
Cast Iron
- Joined
- Mar 18, 2013
- Location
- Washington st
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In the absence of any help, I'd stick a butane camp stove underneath, heat it up to 100* or so then adjust until the bearings were snug but not tight, if you know what I mean. That ought to get you in the ballpark ?I've sent inquiries to timken and the OEM wont answer the phone
It's been a few years, but .001-.003 preload would be my guess on a new bearing.
Agreed. You don't want the shafts to be wobbling around at all, with all the bolts torqued tight. It should feel free turning when the bolts are only snugged up, and should get a bit of drag when you do tighten the bolts up. If it were to require a wrench to turn the shafts, then I'd say it is too tight. Your thinnest shim is likely only .001", so when you get that close, you'll have to decide if you like the feel with it in or out. No shaft shake and a bit of drag is the ideal.
It's been a few years, but .001-.003 preload would be my guess on a new bearing.
Maybe find a manufacturer still out there making a similar unit, and follow there idea of the preload if you get no firm answer.I dont think the OEM exists any more
Still waiting on timken...
I dont expect a hard number on the preload/end play
I'm looking more for what other experanced people have used on similar stuff
is this a speed reducer or increaser or? Parallel shaft? The 90 RPM is input or output?
Horizontal mount gear box. Oil lubricated splash bath with sump. Operating temperature 120F to 140F Input rotation is 90 RPM Assembly temperature 72F to 80F All shims and mating surfaces are clean
Thank you. So many suggestions without mentioning the fact that this all changes as the box heats up.Get the gearbox up to operating temp and check the end play again. Use that operating temp end play as your relevant number.
We used to fit large diameter ( 20" dia ) " Timken " bearings into the facing slides of the " Kearns-Richards " SF-125 Hor bores. Believe it or not they had an interference of 0.020". They were well lubricated with oil and the max speed was about 200 rpm.
Regards Tyrone.
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