12,000 RPM Bearing, shielded or sealed

Bill D · May 8, 2022

Bearing is a R12ff 3/4 bore, 1+5/8 OD. Lightly loaded wood working shaper guide bearing. Will rubber seals hold up to that rpm? Lots of sawdust so I would prefer sealed. It will not run more then 20-30 minutes at a time. Most of the time it will be free spinning with no relative motion between the races. The existing one is an old shielded bearing. Dust got in and it is gritty sounding.
Bill D

Joe Gwinn · May 8, 2022

Bill D said:
Bearing is a R12ff 3/4 bore, 1+5/8 OD. Lightly loaded wood working shaper guide bearing. Will rubber seals hold up to that rpm?

That bearing number seems to come with stainless steel shields, but no rubber seal (which would likely catch fire at that speed). There are bearing makes that guarantee up to 19,000 rpm, so 12,000 rpm is achievable. I'd talk to someone at your local bearing supply house. On Amazon, it's hard to say what will in fact arrive.

dalmatiangirl61 · May 8, 2022

Joe Gwinn said:
On Amazon, it's hard to say what will in fact arrive.

Not really, unless it states made in USA, it will be made in china.

Gordon Heaton · May 8, 2022

I'd go shielded. Its funny, you'd think grinder bearings would all be sealed, but every quality bench grinder I've had used shielded bearings. Worked fine, and lasted.

Joe Gwinn · May 8, 2022

Gordon Heaton said:
I'd go shielded. Its funny, you'd think grinder bearings would all be sealed, but every quality bench grinder I've had used shielded bearings. Worked fine, and lasted.

Same here. I did try sealed bearings on an old Rockwell bench grinder I bought used and was repairing. Didn't work - the bearing quickly overheated, and the old long coast was gone. Moving the stone wheel by hand, the resistance was plain. Replaced with shielded bearings, which work just fine. Fortunately, the lesson wasn't all that expensive.

wood2steel · May 8, 2022

Shielded definitely with be the way to go. Be sure to identify the brand before you buy online. Best to deal directly with established bearing company. NTN, NACHI, etc

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12,000 RPM Bearing, shielded or sealed

Bill D

Diamond

Joe Gwinn

Stainless

dalmatiangirl61

Diamond

Gordon Heaton

Titanium

Joe Gwinn

Stainless

wood2steel

Cast Iron

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