Kmg clone bearing problem

JTknives

JTknives

Joined
Jun 11, 2006
Messages
8,651
well i made a mistake with my 4 bolt flange bearing for my stainless steel kmg clone. the bearing is rated for like 1200 rpm and I'm running way over that and i think i have damaged them. so my question is can i get carbon steel replacement bearings that will fit into my stainless flange. thanks
 
Hey Jarod, Check the housing and see if it is a UC-204 series?

Are you using a 3/4" driveshaft? (UC-204-12)

If so, I've got a set of spherical inserts that you can have.

bearing006.jpg


These are new....samples given to me by a bearing salesman. There are 2 sets of these that have been running at the ABS school for about 6 or 7 years now and they run the snot out of those machines, spinning the driveshaft at about 3500 rpm all day long.

Here's a crazy tip.....if you don't grease them, they will run forever.

If you shoot a few squirts in the zerks...they'll run hot and cause nothing but troubles.

Lemme know.
 
rfrink said:
Hey Jarod, Check the housing and see if it is a UC-204 series?

Are you using a 3/4" driveshaft? (UC-204-12)

If so, I've got a set of spherical inserts that you can have.

bearing006.jpg


These are new....samples given to me by a bearing salesman. There are 2 sets of these that have been running at the ABS school for about 6 or 7 years now and they run the snot out of those machines, spinning the driveshaft at about 3500 rpm all day long.

Here's a crazy tip.....if you don't grease them, they will run forever.

If you shoot a few squirts in the zerks...they'll run hot and cause nothing but troubles.

Lemme know.
Click to expand...

WOW ya thats what i need, the model number on my flange is SSUCF204-12 and it is a 3/4" shaft. man i was bummed when i started to hear a bump bump as the grinder was running. so how much do i need to send you. now my grinder runs at up to 9000 SFPM using a 5" contact wheel which i think is around 6,878 rpm, will those handle it? I don't often run that high but when i do i would like to know if thy can handle the rpm. thanks a bunch man.
 
Well, 6800 rpm seems fast to me...but I think it really boils down to the heat generated in the bearing....and the heat is caused by the lubricant. Thick heavy grease will really get hot! Especially if it is packed full.

I would run them slower for a while...allowing excess grease to discharge for a few weeks...then increase the speeds while watching the temps.

For example, our CNC machining center has some big honking class 7 bearings in the spindle that are about 7 or 8 inches in diameter. The lube spec is for something like 1.5 grams of Kluber isoflex sumpin or another. When I talked to the tech guys about how much is 1.5 grams...they said it is a drop about the size of a bb.

For that size bearing, a bb is basically "no grease". This is when they told me that high speed bearings will last longer if they run completely dry compared to being over greased.

This spindle runs at 10,000 rpm and stays as cool as a cucumber.

Anyway...these are free....they were free to me as samples ...so they are free to you. I just need your address again and I'll be glad to shoot them out in the morning.

BTW... a "bump" noise in the drive shaft area sounds more like a loose set screw in a wheel, pulley or bearing(s). Bad bearings will growl rather than bump.
 
You got 'em...I'll send them out today.

It's about 5 business days in transit to Provo...so you should see them in about mid-week next week.

-Rob
 
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