Is 1144 Stressproof a good bearing surface for a needle bearing (or pin bearing)

[woodchucker]

I need to make a sleeve to adapt my Clausing 8520 to a normal Bridgeport X power feed. The bearing that came with it doesn't fit on the shaft, and rather than make a sleeve for it to fit on, I will just make a new bearing sleeve. The one they provided is not hardened as a file cuts it easily. Is 1144 Stressproof a good material to use? I can put a ground finish on it if necessary, but I suspect it might not be necessary. Can it be used as is, or do I need to heat treat it?

 

[jbobb1]

Typical needle bearing inner race sleeves are hardened, but with just a slow cranking motion, you might get by without heat treat. Maybe use 4140 HT instead of Stressproof.

 

[Provincial]

They sell hardened inner races for needle bearings. Have you checked to see if one will fit?

 

[woodchucker]

the unit came with a race. I am trying to avoid, a shaft, a sleeve, then a sleeve w/race.
I figure if I just do a shaft, and sleeve with a race, I am better off. Since this has to have key slots to the shaft, and then key slots to the gear (not the race) I am better off making the adaptor myself. Eliminating one fitment.

 

[rabler]

Generally you want a hardened face for bearings, as the bearings themselves are hardened and will quickly chew up anything not hardened. I'd use the hardened sleeve that came with the bearing and loctite it into an adapter. Or, just make the whole thing out of bronze.

 

[woodchucker]

Randal, why Bronze? Is bronze that hard? I know it makes good friction bearings, that and sintered bronze / oilite.
My metallurgy knowledge is limited. I know enough to make mistakes..

 

[MrWhoopee]

Use one of the hardened inner races intended for needle roller bearings or flame harden and grind the shaft if possible.

SKF

www.skf.com

edit: I now see that you said there was an inner race provided. Use it.

 

[woodchucker]

Use one of the hardened inner races intended for needle roller bearings or flame harden and grind the shaft if possible.

SKF

www.skf.com

edit: I now see that you said there was an inner race provided. Use it.

 

[woodchucker]

I didn't think the race was hardened. I hit the end of the race with a file and it cut in. So I thought they didn't harden it. I don't know how they hardened the race face, and not the rest of the sleeve. But they did. So the race is hardened, while the edges are not.

 

[MrWhoopee]

I didn't think the race was hardened. I hit the end of the race with a file and it cut in. So I thought they didn't harden it. I don't know how they hardened the race face, and not the rest of the sleeve. But they did. So the race is hardened, while the edges are not.

Those inner races are in the Rc 62-64 range (iirc) and not that thick. If they were through hardened there would likely be the danger of breakage during installation. Possibly nitride hardened on the OD, but that's just a guess.