At 09:45 PM 5/6/2008, you wrote:
>Mark Wendt (Contractor) wrote:
> > I've in the process of building a two axis machine - using the X and
> > Z axis, and I have a three axis stepper/driver combo already set up
> > and basically ready to go. I was wondering if there is some way to
> > configure EMC so that I could slave the Y axis to the X axis. and use
> > two steppers, one on each side of the gantry.
>There are much better ways to do this. Depending on the motion
>hardware you have, this slaving can be done in the HAL layer,
>and once it is set up right, you never need to know there are
>two motors moving in unison again.
>
>The tricky bit is to figure out how to get the two sides of the
>gantry synchronized so the machine is "square" and not
>distorted. The large gantry mills have bearings in the gantry
>towers so that when the gantry sides are out of sync a little it
>doesn't stress or break the machine's structure. Homing the
>axis brings both sides to preset alignment with individual
>sensors. I'm sure there are ways to do this easily in HAL with
>a couple AND gates that shuts off steps to the motor that
>reaches home first, then waits until the second motor gets there
>before completing the home sequence.
>
>This gantry scheme is called a "tandem axis".
>
>Jon
Jon,
Thanks for the info. I was doing a little reading on the
wiki and in the user doc over the weekend, and missed seeing anything
on that. Is there any documentation that I may have glossed over?
Mark
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