[JasonCampbell]

Hi, please recommend cheap incremental encoders with index channel. Least expensive US digital's ones with index ch. were about $40. Are there cheaper ones out there? Thanks..

[DSL PWR]

Unless you find one on ebay, I doubt you will get one for less than us digital.

[epineh]

I got these through DigiKey...

http://www.digikey.com/scripts/DkSea...me=102-1308-ND

I really like how you can select whatever CPR you want, well from 48-2048 CPR, and they fit 9 different shaft sizes.

I am still to turn them on a servo but they cetainly look good.

Cheers.

Russell.

[DSL PWR]

I got these through DigiKey...

http://www.digikey.com/scripts/DkSea...me=102-1308-ND

I really like how you can select whatever CPR you want, well from 48-2048 CPR, and they fit 9 different shaft sizes.

I am still to turn them on a servo but they cetainly look good.

Cheers.

Russell.

I don't thing those have an index pulse.

[epineh]

They do according to the datasheet.

[JasonCampbell]

wow Thanks Epineh! That's one nice price for an index ch. encoder. Spec looks super too. Have you tried it yet?

[epineh]

Not yet, but soon, hopefully a couple of weeks...

Russell.

[lerman]

See http://www.cui.com/amt/ASIC.pdf

The accuracy at the highest resolution (2048 cycles per revolution) is only +- 15 arc minutes. That's +- 1/1440 of a revolution.

Ken

[epineh]

Yeah, just found that out myself, so does this mean that they are useless for CNC work ?

Russell.

[Larken]

Those cheap Digikey encoders are not that good. They seem to be affected by the motors magnetic field. I know someone that had problems with servo jitter and drifting and when he used those encoders. He changed to a US digital and it fixed the problem.
Spend the extra $10 and get a US digital.

[epineh]

To be honest I would have gone US Digital to start with but to get 3 encoders into Australia was going to cost about $120.00 US for the postage alone... *ouch

Cheers.

Russell.

[lerman]

I ship small stuff to Australia all the time. The cheapest way is by US Postal. A flat rate expedited envelope is about $25. It should easily hold three encoders.

Ken

[epineh]

Yup that is about what Digikey charged me, unfortunately US Digital won't use USPS, the cheapest postage rate I could get them to send was $115.00 US and claimed the package would weigh 4lbs... that is a lot of packaging.

I could get somebody to forward them on from the US (I did get a few offers for this) but for hobby quantities, it just isn't worth the pain.

Russell.