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Author Topic: encoder resolution with stock powertron servos  (Read 1726 times)

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encoder resolution with stock powertron servos
« on: December 01, 2014, 01:33:50 PM »
I have the stock Bridgeport dc servos on my machine.

The stock encoders were 250 ppr

my new ones have are adjustable up to 2000 ppr.

Is there a setting that works best with the older Bridgeport dc servos?

Is  there a setting that works best for Mach 3

Thanks, john
Re: encoder resolution with stock powertron servos
« Reply #1 on: December 01, 2014, 06:11:18 PM »
More resolution is usually better right up to the point that you can't generate enough steps to drive them as fast as you want to.
What servo drive are you going to use?

Mike
We never have the time or money to do it right the first time, but we somehow manage to do it twice and then spend the money to get it right.
Re: encoder resolution with stock powertron servos
« Reply #2 on: December 02, 2014, 02:00:55 PM »
Im using the cncdrives  DG4S-16035 with a 82 v power supply.

The reason I ask is my PID tuning is off a little and I cant get it right on the money.

So I'm thinking the brushed motors are having trouble making those last small moves.

For instanced I ask it to go 1000 pulses it goes 1012 pulse.

I don't know just thinking out loud.

Thanks john

Re: encoder resolution with stock powertron servos
« Reply #3 on: December 02, 2014, 04:35:19 PM »
If you have a deadband setting and it is more than zero then that could account for that. You may have to add some "I" to your PID tuning.

Mike
We never have the time or money to do it right the first time, but we somehow manage to do it twice and then spend the money to get it right.

Offline BR549

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Re: encoder resolution with stock powertron servos
« Reply #4 on: December 02, 2014, 07:47:02 PM »
A 500 count encoder is MORE than plenty for a Bridgeport.

Just a thought, (;-) TP