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Post by madpatty on Dec 12, 2019 13:25:24 GMT -5
Hi All. I am looking to buy some Ceramic Hybrid Bearings for a gas turbine project. Especially similar to this one- SKF 7003 ACE/HCP4A Do you guys know where this can be bought? Also How do you guys go about making your own Full Complement Bearings. Which particular bearings you buy and then convert them to full complement? Thanks.
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Post by racket on Dec 12, 2019 16:33:35 GMT -5
Hi Patty Those precision bearings are EXPENSIVE :-( If you're not aready a Member of the GTBA www.gtba.co.uk/ , you should be, as they have a huge amount of info on bearings modifications . When I was making mine I used standard deep groove bearings and purchased the SiN balls , both were 5/16" dia . It was just a case of dismantling the standard bearing , fitting the inner raceway onto a mandril in the lathe and grinding off most of the shoulder on one side , I left just enough so that the full compliment of balls when fitted into the outer raceway and heated moderately would slip over the remaining bit of shoulder on the inner raceway that had been fitted to a heavy heatsink backing and placed in the freezer for half an hour , I made up various jigs to hold things for easier assembly. With that little bit of shoulder in place it meant the bearing didn't fall apart during engine assembly unlike when all the shoulder is removed. Cheers John
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CMDR_Boom
Member
Joined: September 2019
Posts: 23
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Post by CMDR_Boom on Dec 13, 2019 9:16:38 GMT -5
If money is no object, Amazon has them for $657 US. I came across a pile of SKF bearings for something I was looking for but ended up getting Timken's due to budget.
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BFTO
Veteran Member
Joined: February 2016
Posts: 128
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Post by BFTO on Dec 13, 2019 12:00:59 GMT -5
If you want I can look directly from SKF, I buy aaalot of bearings directly from SKF in my work. But then it is freight/tax from Sweden to where you are located.
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monty
Senior Member
Currently being spanked by mother nature.......
Joined: September 2018
Posts: 399
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Post by monty on Dec 25, 2019 0:38:34 GMT -5
Boca bearings is another place. There is also a German bearing supplier that specializes in small turbines called GRW....more expensive though.
Monty
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Post by madpatty on Dec 25, 2019 17:49:03 GMT -5
If you want I can look directly from SKF, I buy aaalot of bearings directly from SKF in my work. But then it is freight/tax from Sweden to where you are located. Ok. I will let you know if I won’t be able to find anything locally easily. Thanks
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Post by madpatty on Dec 25, 2019 17:52:07 GMT -5
Boca bearings is another place. There is also a German bearing supplier that specializes in small turbines called GRW....more expensive though.
Monty
I actually contacted Ortech Ceramics already. Do you have any prior experience with them? I asked them max. Rpm on their full complement hybrid bearing and they quoted 20k rpm which is quite low when compared to a skf, so was a bit skeptical in trying them. Thanks
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Post by madpatty on Dec 25, 2019 17:53:44 GMT -5
If money is no object, Amazon has them for $657 US. I came across a pile of SKF bearings for something I was looking for but ended up getting Timken's due to budget. That is too expensive. I will rather buy an angular contact and convert it to full complement myself, if it is doable.
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Post by racket on Dec 25, 2019 18:51:10 GMT -5
Hi Patty
Its doable :-)
Cheers John
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monty
Senior Member
Currently being spanked by mother nature.......
Joined: September 2018
Posts: 399
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Post by monty on Dec 25, 2019 21:13:02 GMT -5
Boca bearings is another place. There is also a German bearing supplier that specializes in small turbines called GRW....more expensive though.
Monty
I actually contacted Ortech Ceramics already. Do you have any prior experience with them? I asked them max. Rpm on their full complement hybrid bearing and they quoted 20k rpm which is quite low when compared to a skf, so was a bit skeptical in trying them. Thanks No direct experience yet. I was planning to buy from them. Most of the the "grey market" folks are not going to give you a guarantee on speed. Usually the cage is the limit. The last full compliment angular contacts I bought were from GRW. They were 10mm bearings and I think they were about $300.
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Post by madpatty on Dec 25, 2019 23:10:18 GMT -5
Hi Patty Its doable :-) Cheers John Hi Racket, Does it need any machining for an angular contact bearing to convert it to full complement? Or is it just heating the outer race and cooling the inner race? I remember you mentioned that machining is required to convert a deep groove to full complement. Thanks
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Post by racket on Dec 26, 2019 0:45:25 GMT -5
Hi Patty
I'm not sure , never used angular contact bearings just normal inexpensive deep groove ball bearings , you might need to purchase one and experiment .
Cheers John
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