General encoder questions

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19 Jun 2021 12:03 #212394 by Goulven
Hi,

I have a poor quality little CNC. Due to friction (plastic nut) on the X and Y axes I lose steps.

I am wondering about adding encoders on the X and Y axes (I have a small budget :( ).

If LinuxCNC can correct the postitioning with encoders, what type of encoders to choose (Linear, Rotary)?

For rotary encoders, which technology, optical, magnetic?

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19 Jun 2021 13:47 #212402 by BigJohnT
Replied by BigJohnT on topic General encoder questions
Here is one persons experience adding encoder to stepper axis.
wiki.linuxcnc.org/cgi-bin/wiki.pl?Steppers_With_Encoders

I would try to remove the friction on the nut first.

Slowing down maximum velocity can help because stepper loose torque as the speed increases. Like wise reducing acceleration can help.

Increasing voltage for the drive will give you more torque at high speeds.

A lot depends on how you plan on reading the encoder pulses... beware it's not a simple path with steppers.

JT

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19 Jun 2021 17:01 #212424 by Goulven
Replied by Goulven on topic General encoder questions
Thanks BigJohnT, so I will try to remove these plastic nuts. They are only used to fix the carriage, there is a copper nut to transmit the movement.

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