Opitcal Encoders
 

I'm having trouble finding optical encoders for a swerve drive. The best i could find is McMaster's encoders which are pretty pricey. Anyone know where I could find some good encoders?

Re: Opitcal Encoders
 

AndyMark has some cheapy encoders (http://store.andymark.biz/am-0174.html). They're kind-of annoying because you're suppose to superglue them to the drive shaft, but they work.

Newark has a ton of less specialized encoders. They run $5-10. Just go to their site and search "encoder" then click on absolute/mechanical. www.newark.com

Jameco also has half of a dozen choices from $3-20. Try the same search at: http://www.jameco.com.

I also tried digi-key, but they seem to only sell the components if you wanted to build your own.

Re: Opitcal Encoders
 

Thanks a lot. Yea I saw the Andy mark one but wondered how it was suppose to be mounted to the shaft.

Re: Opitcal Encoders
 

You're welcome! I think you'll find your best fit at Newark, they seem to have the most thorough selection.

I'm glad to see you're using encoders for the swerve drive. Lots less to worry about than potentiomers. The only thing is you might want to search for an absolute encoder so the robot can figure out the orientation of the wheels. Usually that means that it's a triple encoder instead of a double; the third disk will have one notch in it to mark each revolution. That notch always occurs at the same angle so you can use that to initalize your wheels to a certain angle every time your robot turns on.

Re: Opitcal Encoders
 

You might want to consider these at US Digital.

http://usdigital.com/products/encode...tary/shaft/s4/

If you go with these, I think there is a connector assembly that you might want to purchase as well.

Or, try these. The price is right, not ball bearing but if you are using them at wheel speed, they'll last as long as needed.

http://www.bgmicro.com/index.asp?Pag...D&ProdID=12916

Here's the link to a CD discussion.

http://www.chiefdelphi.com/forums/sh...cheap+encoders

Good luck.

Re: Opitcal Encoders
 

Forgot the last link.

http://www.chiefdelphi.com/forums/sh...cheap+encoders

Re: Opitcal Encoders
 

More info on absolute encoders in this thread.

--Ryan

Re: Opitcal Encoders
 

We are very happy with the US Digital S4 encoders (so far). Due to a poor design (initially), we bent the shafts of two of them. They continued to function fine (although with some more friction). Compared to other encoders that we've used that have stopped working if we looked at them wrong, we're very happy. They are very compact and fit in places where other encoders wouldn't have.

I do strongly recommend getting a cable assembly, CA-MIC4-SH-NC.

Re: Opitcal Encoders
 

The US Digital encoders sold by AndyMark clamp onto a .25" shaft quite well without the need for glue.

Re: Opitcal Encoders
 

We have started using this really affordable encoder ($5).
http://www.bgmicro.com/index.asp?Pag...D&ProdID=12916
After testing with the cRio, this Oak/Grigsby Encoder performs at the level of the Grayhill 61R

We mounted the encoder on the CIM with latex tubing connecting the drive shaft.

http://picasaweb.google.com/LamarRob...45261834041890

For more pictures of the mounting scheme, check out our photo gallery,
http://2009.discobots.org/node/34