> Date: Sun, 13 Mar 2016 13:53:07 -0700
> From: [email protected]
> To: [email protected]
> Subject: Re: [Emc-developers] tandem PID steppers - 1 or 2 PIDs
>
> On Sun, 13 Mar 2016, Chris Morley wrote:
>
> > Date: Sun, 13 Mar 2016 20:30:17 +0000
> > From: Chris Morley <[email protected]>
> > Reply-To: EMC developers <[email protected]>
> > To: EMC DEV <[email protected]>
> > Subject: [Emc-developers] tandem PID steppers - 1 or 2 PIDs
> >
> > Looking to fix up tandem steppers in pncconf.
> > This is using Mesa stepgens.
> >
> > Would it work fine to use one PID loop to control
> > the two stepgens?
> >
> > basically ignore the second stepgens fb.
> >
> > Thanks
> > Chris M
>
>
> I dont think so, there is nothing to keep one stepgens position from slowly
> drifting away from the others during acceleration due to slight differences
> in
> position read and in velocity write times. These offsets would be small and
> should cancel out but I dont get the warm fuzzys that long term position
> drift
> is impossible with this approach.
>
> Also this would prevent the (useful) addition of position offsets between
> stepgens (like the Gantry comp does)
>
>
Ok Thanks Peter. will will program it with two separate PIDs
Chris M
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