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colin



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PostSubject: bearing suppliers   Sun Nov 29, 2009 5:32 pm

First of all, a question. What bearings have you guys used before in drumbots, and what max loads were they rated for?

secondly, if you search for bearings most websites are for the manufacturers and distributors or for skate bearings, not retail sites. So, I thought I'd share a few retail sites that would be good for battlebots:

http://bearingsdirect.com/
http://vxb.com/
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Cody
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PostSubject: Re: bearing suppliers   Sun Nov 29, 2009 10:19 pm

mcmaster.com
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colin



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PostSubject: Re: bearing suppliers   Sun Nov 29, 2009 10:28 pm

well, that goes without saying, haha

grainger.com too.
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jeeves_m_d
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PostSubject: Re: bearing suppliers   Sun Nov 29, 2009 11:04 pm

I personally use bronze bushings in drum/beater bots because they takes up less space, they are cheaper and easy to replace, in most cases they are stronger because you dont have to worry about crushing the little balls, the only Con i have seen is there is a little more friction but its hardly noticable. Mcmaster has these cheap.

But If you really want to use bearing. Banebots sells the bearings used in there gearboxes but these would only work for a 15 pounder or smaller. Otherwise go with mcmaster
http://banebots.com/c/MOTOR-ACC the bearings are about halfway down the page

But what weight class are you planning on using these bearings in?
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Cody
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PostSubject: Re: bearing suppliers   Sun Nov 29, 2009 11:12 pm

http://forums.delphiforums.com/THERFL/messages/?msg=6229.1
Some good info, alot from RJW and his experience
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colin



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PostSubject: Re: bearing suppliers   Sun Nov 29, 2009 11:27 pm

thanks for the link.

I'm designing a 120 pounder. I'm not going to use bushings, because that would reduce the top speed and startup time more than I'm willing to allow.

I already picked out a bearing, I just wanted to compare it to what some other drums have used in the past.
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Dan Curhan
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PostSubject: Re: bearing suppliers   Mon Nov 30, 2009 10:19 pm

McMaster's bearing catalog is kind of misleading. Their English bearings SUCK, but they have a decent selection of metric bearings. If you want to shell out some $$, the bearings that we used in Copperhead (which were AMAZING... really really amazing) are these:

25mm spherical roller bearings

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colin



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PostSubject: Re: bearing suppliers   Mon Nov 30, 2009 11:04 pm

Dan Curhan wrote:
McMaster's bearing catalog is kind of misleading. Their English bearings SUCK, but they have a decent selection of metric bearings. If you want to shell out some $$, the bearings that we used in Copperhead (which were AMAZING... really really amazing) are these:

25mm spherical roller bearings

Thanks Dan. Nice choice. Unfortunately I have a... unusual application, so I had to pick these:

http://bearingsdirect.com/store/index.php?l=product_detail&p=298

I would have liked to use a roller bearing, but there's not much available in a size like that.

From what I've seen, it looks like the problem isn't with McMaster, standard bearings in general have horrible selection - metric is the way to go.
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rjw
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PostSubject: Re: bearing suppliers   Mon Nov 30, 2009 11:28 pm

Those bearings are very LIGHT duty...I hope that you know what you're doing

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colin



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PostSubject: Re: bearing suppliers   Tue Dec 01, 2009 12:02 am

rjw wrote:
Those bearings are very LIGHT duty...I hope that you know what you're doing

yeah, I'm a bit worried. They aren't that light duty because they're so big (~3" ID, 5" OD), and they have a dynamic radial load capacity of 6480 lbs, which isn't much less than the ones Dan used for copperhead.

I'm mostly concerned about what an axial load or torque out of axis would do to them, since they aren't meant for that. I'm thinking about either doubling them up, or using a thrust bearing too.
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rjw
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PostSubject: Re: bearing suppliers   Tue Dec 01, 2009 12:09 am

by light duty, I mean that they are a light duty series bearing. 6000 and 6900 series bearings are light duty, while 6200 series are normal and 6300 series are heavy...or something like that.

Copperhead used spherical rather than ball bearings, which is a different animal. Needles will support the most load...pretty much, except for a bushing which depending on the bushing material can support the most..especaiily if speeds are not too high.

Any drawings of your bot, drum or whatever???

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Dan Curhan
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PostSubject: Re: bearing suppliers   Tue Dec 01, 2009 12:15 am

the only thing with needle bearings is that they cannot handle any misalignment whatsoever... the spherical rollers we used could handle like a 2 degree misalignment i think

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colin



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PostSubject: Re: bearing suppliers   Tue Dec 01, 2009 1:09 am

rjw wrote:
by light duty, I mean that they are a light duty series bearing. 6000 and 6900 series bearings are light duty, while 6200 series are normal and 6300 series are heavy...or something like that.

Copperhead used spherical rather than ball bearings, which is a different animal. Needles will support the most load...pretty much, except for a bushing which depending on the bushing material can support the most..especaiily if speeds are not too high.

Any drawings of your bot, drum or whatever???

yeah, they are a light duty series - but not actually "light duty", due to the fact that they're so large compared to other bearings used in drumbots. If you look at the "normal" duty bearing 6205 (same dimensions as copperhead's), the bearing I spec'd out has over twice the max load rating.

http://bearingsdirect.com/6200s.htm
http://bearingsdirect.com/6900s.htm

I don't have a drawing to post yet, but it's basically a drum with those bearings rotating on two separate S7 "pins", which are bolted to a 7075 frame.
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Jeff L
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PostSubject: Re: bearing suppliers   Tue Jan 19, 2010 5:12 pm

What does everyone think of these?

http://www.grainger.com/Grainger/items/4YWJ6

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colin



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PostSubject: Re: bearing suppliers   Tue Jan 19, 2010 5:21 pm

Jeff L wrote:
What does everyone think of these?

http://www.grainger.com/Grainger/items/4YWJ6

looks good. you have to have tight tolerances though, since they won't tolerate much misalignment.
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rjw
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PostSubject: Re: bearing suppliers   Tue Jan 19, 2010 6:51 pm

Jeff L wrote:
What does everyone think of these?

http://www.grainger.com/Grainger/items/4YWJ6

they require inner races or a shaft hardened to between 58-62 Rc...that may be a little brittle, depending on shaft material..you can use a softer shaft, but it will wear possibly quickly

they are normally a fairly loose fit..except for the precision class used in high end machine tools.

no provisions for end play or seals... so deal with that

Also, if the span between them is big......then you may end up with a lot of shaft bending at only 25mm diameter...if this is for your bot of bots, with drum of drums..

btw: I'm sure you can get them a fair bit cheaper from a bearings supplier rather than from graingers....if you really want them

jmo

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Cody
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PostSubject: Re: bearing suppliers   Tue Jan 19, 2010 9:02 pm

rjw wrote:
with drum of drums..

jmo

glad im not the only one
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Jeff L
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PostSubject: Re: bearing suppliers   Tue Jan 19, 2010 10:15 pm

Found the same model of bearing Dan posted (that Copperhead uses) for dirt cheap compared to McMaster ($35-$40). Google: "22205 spherical roller bearings."

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rjw
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PostSubject: Re: bearing suppliers   Tue Jan 19, 2010 10:16 pm

Cody Harris wrote:
rjw wrote:
with drum of drums..

jmo

glad im not the only one

You are the only one...the only one with more posts than me... cheers affraid Laughing

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Dan Curhan
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PostSubject: Re: bearing suppliers   Wed Jan 20, 2010 2:10 pm

$30-$40? really?
Is it a wholesale place or can you just buy one pair of bearings?

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SenaiERI
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PostSubject: Re: bearing suppliers   Wed Jan 20, 2010 9:32 pm

colin wrote:


I would have liked to use a roller bearing, but there's not much available in a size like that.


Do you mean tapered roller bearings? These can handle a great load and will self correct any misalignment you might get during battle, although I would hope you wouldn't get any in a drum bot.

If you worried about size, MSC sells these in all sizes and I have a few sites that sell some really tiny ones.
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