28-01-2008 22:07

Ben Piecuch

Re: pic: 254/968 Bearings

I think the bearings on that table alone cost more than our robot. Wow, can't wait to see what the rest of this drivetrain (and robot) looks like!

Bengineer

28-01-2008 22:13

RyanN

Re: pic: 254/968 Bearings

That's about 120lbs worth of bearings, isn't it?

28-01-2008 22:15

Branden Ghena

Re: pic: 254/968 Bearings

All you need now is a robot controler, a battery, and some bumpers!

28-01-2008 22:32

Travis Covington

Re: pic: 254/968 Bearings

Quote:

Originally Posted by Ben Piecuch I think the bearings on that table alone cost more than our robot. Wow, can't wait to see what the rest of this drivetrain (and robot) looks like! Bengineer

28-01-2008 22:34

Brandon Holley

Re: pic: 254/968 Bearings

Wow travis those are some good prices on bearings...


I was about to post a "cha-ching" but if you got those for 100 bucks more power to you. Hook me up with that company

28-01-2008 22:54

chris31

Re: pic: 254/968 Bearings

Quote:

Originally Posted by Travis Covington We actually have a local source (WJB Group) that gets precision imports for very cheap. A typical double sealed R8 costs less than 50 cents from them. All of the bearings in the picture above cost ~ $100.

29-01-2008 00:32

=Martin=Taylor=

Re: pic: 254/968 Bearings

Compare that to $80 for 8 bearings at Osh .... Dang i'm envious

29-01-2008 07:50

Qbranch

Re: pic: 254/968 Bearings

So if it cost you 47 cents (you said a little less than fifty why not 47? ) and you spent about a hundred dollars, you'd have about 213 bearings.

They look like 3/8" bearing bore, 7/8" through bore, 1" flange bearings to me by the proportions on the picture, and they look like they're made by General Bearing (GBC). According to GBC, the weight of each of those bearings is 0.035lb.

So... really the weight of all those bearings isn't horrible.. 7.455lb. However, that's just bearings! Wow!

Well, i'm kind of guessing most of your axles are going to have two bearings on them (a few might have 3~4) so assuming you have 2.5bearings average per axle, you've got about 85 spinning axles on your robot. I had no idea crab drive had so many... can't wait for pictures!

-q

p.s. anything with 85 axles that covers less area than a sheet of plywood should be on How it's Made.

29-01-2008 08:03

Billfred

Re: pic: 254/968 Bearings

Quote:

Originally Posted by Qbranch So if it cost you 47 cents (you said a little less than fifty why not 47? ) and you spent about a hundred dollars, you'd have about 213 bearings. They look like 3/8" bearing bore, 7/8" through bore, 1" flange bearings to me by the proportions on the picture, and they look like they're made by General Bearing (GBC). According to GBC, the weight of each of those bearings is 0.035lb. So... really the weight of all those bearings isn't horrible.. 7.455lb. However, that's just bearings! Wow! Well, i'm kind of guessing most of your axles are going to have two bearings on them (a few might have 3~4) so assuming you have 2.5bearings average per axle, you've got about 85 spinning axles on your robot. I had no idea crab drive had so many... can't wait for pictures! -q p.s. anything with 85 axles that covers less area than a sheet of plywood should be on How it's Made.

29-01-2008 12:59

SgtMillhouse648

Re: pic: 254/968 Bearings

Not sure how you guys are doing your crab, but I'm pretty sure we're down to 3-4 bearings per module this year if I'm thinking right. Anyhoo, can't wait to see it finished!
Malhon

29-01-2008 13:50

Cory

Re: pic: 254/968 Bearings

Quote:

Originally Posted by Qbranch So if it cost you 47 cents (you said a little less than fifty why not 47? ) and you spent about a hundred dollars, you'd have about 213 bearings. They look like 3/8" bearing bore, 7/8" through bore, 1" flange bearings to me by the proportions on the picture, and they look like they're made by General Bearing (GBC). According to GBC, the weight of each of those bearings is 0.035lb. So... really the weight of all those bearings isn't horrible.. 7.455lb. However, that's just bearings! Wow! Well, i'm kind of guessing most of your axles are going to have two bearings on them (a few might have 3~4) so assuming you have 2.5bearings average per axle, you've got about 85 spinning axles on your robot. I had no idea crab drive had so many... can't wait for pictures! -q p.s. anything with 85 axles that covers less area than a sheet of plywood should be on How it's Made.

10-02-2008 23:21

RyanN

Re: pic: 254/968 Bearings

I know this is sort of irrelevant, but the other day I counted all the bearings we had on our robot, and it was about 40.

10-02-2008 23:24

s_forbes

Re: pic: 254/968 Bearings

There must be something wrong with our bot, we only have 16 ball bearings (12 of which are in the wheels...)

10-02-2008 23:49

Dan Petrovic

Re: pic: 254/968 Bearings

We only have 6 bearings on our robot this year. Four for the drive (that's right) and two for the arm.

Bronze bushings accomplish what we need for most joints for less money and less weight.