Machining Bearing Holder

[TexasRotorHead]

Hello All,

Right now I am designing a steel structure out of 4130 steel. I have designed in some bearing holders to be welded in, but have had a difficult time finding a supplier for the material.

The bearing holder is a flanged design with an OD of 6 inches and bearing surface of 4.156 inches (it is a strange bearing).

So right now I have only found extruded pipe which basically costs me the whole section for the 3 inches I need ($250+).

I have also found 4140 round discs, but my concern is the 4+ inch hole is alot of machining and the different alloy may be difficult to weld.

Some ideas on how to make this part that can be welded to 4130 steel would be greatly appreciated.

I have included a preliminary drawing. I am new to engineering drawings, so please be nice.

Thanks

 

[MikeHalloran]

You could have rings flame-cut from 1-1/4" plate.
Send your drawing to several steel suppliers and ask for suggestions and quotes, for blanks and/or finished parts.





Mike Halloran
Pembroke Pines, FL, USA

 

[MikeHalloran]

p.s. The drawing lacks radii, chamfers, and tolerances, but is otherwise not bad.


Mike Halloran
Pembroke Pines, FL, USA

 

[BradfordJim]

If you only have to make a few, just bite the bullet and machine them. With a CNC it is not a big deal. However the 4-40 threaded holes are a pia. If anything the tapping will be a problem with potential breakage of taps. Use a bigger thread if possible, 10-32 would make it much easier.

Just my 2 cents worth.

Jim

 

[williedawg]

agree about the 4-40 holes.
Even 1/4-20 holes throuch 1 1/8" material, especially 4130, can be a PIA.

If size is a concern, could these be 10-32's and relief drilled from the non-working side?

The flange holes wouldn't be a big deal for a 10-32, however.

You'll need to tighten tolerances for the bearing bore, and perhaps the fit diameter of the OD of this adapter.
Check your bearing fits reference book(s) for intended purpose, dimensions, and callouts.

 

[unclesyd]

Aside from the recommendation to flame cut you might want to price water jet cutting.

Another approach would be to contact someone like Liberty Forge and see what they have laying around. Since you don't need a pedigree they may have something on the yard. I have been quite successful in getting one offs in this fashion.

Liberty produces several shapes approaching your requirements.

http://www.libertyforgeinc.com/