RE: [CAD_CAM_EDM_DRO] Re: Video of my resonance

Hi Dave,

Just one thing about your process below. If indeed the resonance is like
the twin engine beat (or two almost in tune instruments), then just
loosening and retightening might not do it. What I'm thinking is that if,
at their rest position the first step energizes different windings, they
motors could still be out of sync although now not by micro-steps so perhaps
it's not an issue?

But, depending on how his hardware is configured, does one motor turn
clockwise and one counter clockwise? What I'd try for, is to ensure that
each motor energizes the same winding from that 'rest' position you describe
below and that the motor moves in the correct direction when those windings
are energized.

Again, perhaps that's not needed. Might well just be a micro-step out of
sequence issue. Normally the beating of the two out of sync propellers
comes from one engine running at a slightly different speed. Just like an
analogue mixer in radio, what we here is the sum and the difference of the
two frequencies.

One way to find out, if it's mechanically possible is for him to disconnect
and decouple one of the two motors. Since the gantry is on a track and not
running a double worm, one motor might be able to move the works at the slow
resonant speed.

Just more ideas. Perhaps I'm way off too.

John Dammeyer

> As for the out of sync, that would be simple to handle.
>
> I think you could just power off everything (lock the table to keep it
> in posistion.
>
> Loosen the motor pulleys so the motors can move easily.
>
> Then tighten the pulleys again.
>
> That should have the motors cog into a natural posistion.
>
> If the tightening of the pulley moves something, then it may go out of
> sync.
>
> I could be wrong, so comments are welcomed.
>
> Dave