Help Identifying part

[T^2]

Originally Posted by DampRobot

Generally, the CD community is a lot more helpful if we know your goal. Is this to build a swerve drive in the offseason?

Originally Posted by bs7280

The team that I am on is looking to build a swerve drive module in the off season as a proof of concept/learning experience.

Apparently so.

[bs7280]

If we can not find a specific part like this, anything else that will allow us to attach the wheel module to the frame while allowing the gear for rotation being attached (obviously) would be just as helpful

Edit: clarification

So I was able to design a swerve drive module like above, where one gear is attatched to the shaft, which will power the wheel. The other gear would be attatched to the frame of the module, allowing for rotation. The tricky part was attatching the whole module to the frame without messing up the rotational gear

[MichaelBick]

You might want to start looking at CADs of swerves. 973 ran a mechanically solid swerve and posted their CAD. Basically you want a large ball bearing for radial loads, a thrust bearing, and some kind of gear/pulley/sprocket for rotation

[bs7280]

Im having trouble finding it? do you know where it would be?

[nerdherdmember]

According to the product page on 221 systems, they are using an oilite bronze bushing. Although a specific McMaster-Carr part number was not listed, something that fits the dimensions of your designs can surely be found on McMaster-Carr. I wish you the best of luck in your swerve project. Don't be afraid to post here for more help if you need it, and be sure to post the final results to show what you've done at the end of the offseason! My team isn't quite ready for swerve at the moment, and I always get a little bit jealous watching non-tank drive robots glide around the field effortlessly, although our WCD wasn't too shabby this year.

[bs7280]

I found another picture that had an interesting looking mounting solution:



What are the black things near the top of the frame of the module that look like they rotate?

What is the larger "Case" or shaft around the smaller shaft that powers the wheel?

[nerdherdmember]

Originally Posted by bs7280

I found another picture that had an interesting looking mounting solution:

What are the black things near the top of the frame of the module that look like they rotate?

What is the larger "Case" or shaft around the smaller shaft that powers the wheel?

Those appear to be lazy susans.

[EricH]

Originally Posted by bs7280

I found another picture that had an interesting looking mounting solution:



What are the black things near the top of the frame of the module that look like they rotate?

Those are what some folks would call a lazy susan. I've also seen them called turntables. In essence, it's a very large-diameter ball bearing. Similar to what you circled earlier, only much flatter.

What is the larger "Case" or shaft around the smaller shaft that powers the wheel?

Most folks would call that a sleeve, and it's a second shaft that rotates the wheel.

BTW, there are more types of swerve modules than coaxial, if you wanted to try to locate some pictures. 3928 did some last year where the motor was inside the wheel; I think 16 has done some where the motor is in the module.

[runneals]

Originally Posted by EricH

BTW, there are more types of swerve modules than coaxial, if you wanted to try to locate some pictures. 3928 did some last year where the motor was inside the wheel; I think 16 has done some where the motor is in the module.

You can find details about ours here.

[bs7280]

Here is another photo of another teams swerve drive with a nice mount found here

similar to the team 221 product, but would love to know where this came from, as it is way better of a solution than what we would have probably done.

[CENTURION]

Originally Posted by bs7280

I found another picture that had an interesting looking mounting solution:



What are the black things near the top of the frame of the module that look like they rotate?

What is the larger "Case" or shaft around the smaller shaft that powers the wheel?

As others have said, those are lazy susans. I would be hesitant to use them in a swerve drive. If you put any significant side load on them (Which can happen very easily on the field), I've seen the bottom and top halves of them pull apart and warp, which ruins them very quickly.

[bs7280]

Originally Posted by CENTURION

As others have said, those are lazy susans. I would be hesitant to use them in a swerve drive. If you put any significant side load on them (Which can happen very easily on the field), I've seen the bottom and top halves of them pull apart and warp, which ruins them very quickly.

After doing some research and designing, we probably will not use lazy susans for the reason you said. We do however have a possible solution for the piece pictured above.

Although it will definitely not be as eloquent as Neutrio's swerve drive.

[CENTURION]

Originally Posted by bs7280

After doing some research and designing, we probably will not use lazy susans for the reason you said. We do however have a possible solution for the piece pictured above.

Although it will definitely not be as eloquent as Neutrio's swerve drive.

Well to be fair, very few swerve units will be as elegant as Neutrino's

Yeah, we had a lazy susan on our minibot deployer in 2011, after slamming it into the pole fifty or sixty times, it was totally shot.

Can I ask what your solution was?

[JChang]

The 221 Revolution 2 Swerve module uses thrust needle roller bearings, they can be found here. That is the silver ring on your first picture.

[ehfeinberg]

Originally Posted by JChang

The 221 Revolution 2 Swerve module uses thrust needle roller bearings, they can be found here. That is the silver ring on your first picture.

No they don't... The 221 Revolution 2 Swerve Modules just have a bronze bushing to separate the steering from the drive shaft.