Recommended encoder?

[cnc2k]

my freind told me about this site, so far everything is good alots good informations and photos.

I'm looking for some encoder for servo motor.

[cnc2k]

also is there any good servo controller other than gecko

[ynneb]

I dont know about brands of encoders, but I made the mistake of getting single ended encoders and not differential encoders. You cant run very long lenths of control cable for single ended ones.

Another brand of driver is Rutex. These have a much higher amperage handling capacity. I guess it depends on the amperage of your servos that will determine what you need.
Have a look here for other types http://www.cnczone.com/forums/forumd...?s=&forumid=30

I plan to make up a comparisom chart in the future.

[Al_The_Man]

A fairly cheap encoder (especially if you buy 10!) is Renco, they have through-shaft type that can be fitted direct on to the motor as long as it has a rear shaft and this eliminates a coupler.
And like ynneb (benny) says, use a differential if possible for long cable lengths.
Al

[ezland00]

edit

[cnc2k]

Originally posted by Al_The_Man A fairly cheap encoder (especially if you buy 10!) is Renco, they have through-shaft type that can be fitted direct on to the motor as long as it has a rear shaft and this eliminates a coupler. And like ynneb (benny) says, use a differential if possible for long cable lengths. Al

How much is it? Can you send me a link?

[Al_The_Man]

About $70 ea for qty 5 last time I bought some www.renco.com , they come in many shaft sizes.
Al

[IvanTochev]

hi, look at www.usdigital.com for encoders, the E2 is ~ $40,- and really good. (it´s TTL, not differntial)

[Sanghera]

Kind of a Newbie Question, but, what is an encoder, what does it do. Does it tell the computer where the motor is?
Thanks.

[trubleshtr]

yup, feedback, otherwise it's like driving your car with your eyes closed. Encoders are not needed but are a good feature to have if you need better positioning of your axis, most wood working cnc's don't have them because they don't need to have as much precision......

[balsaman]

They are needed if you are using servos. A servo knows nothing about where it is, the encoder sends the position back to the driver. An encoder is NOT needed on steppers. Steppers can be accuratly positioned by the drive without any feedback.

Eric

[ynneb]

Steppers can be accuratly positioned by the drive without any feedback.

Unless the stepper loses a few steps due to too much load on it. Then the stepper is blind and the computer does not know that it missed a step.

A servo encoder will always report back to the computer where the servo is, regardless of the load.


Encoders can have many thousands of lines. I have heard of them having up to 20,000 lines. You can imagine the accuracy they can give.