Re: [CAD_CAM_EDM_DRO] Re: Re: Re: Electronic Lead Screw & Power Cross Feed | Poor Man''s CNC ?

Chris,

The step pulses out are compared to the encoder pulses in, The they are compared within a macro 5 times per second in Mach3. The macro will enact a "feedhold" if the following error is exceeded.

Thanks,
Ron Rogers
Closed loop interfaces for Mach CNC software that monitor machine
position
Alerts and halts machine on position errors, Servo and stepper systems
Provides additional outputs and inputs.
PCI Parallel port cards
DB-25 Cables
Micronor MPG's
Heatsinks for drives
Special Combo pricing
www.rogersmachine.net


Chris Brick <cbrick@...> wrote:
Ron,

> Don't have an explanation of how it can do this in regard
> to speed but, it does it. When first started using encoder counts to
> monitor position, the concern was timing constraints. Now they aren't
> given much attention after three machines have exceeded the 22.5k
> mark without any issues.

Any chance you can give an explanation of how the encoder board injects
position into mach3? Is the encoder position updated in mach three
during every cycle or is your board calculating some position
information and doing a comparison to mach's position information?

I've got a project coming up that could really use some position
feedback. I'll be using mach3, geckos, and servos.

Thanks,

Chris


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