Re: Linux vs. DOS

Sorry I haven't gotten back to you today, I've caught a bad cold and feel
like hell. I'm glad you got hold of Fred. I called him today too and he
briefed me on the discussion you had regarding your problems.

> From: "Tim Goldstein" <timg@...>
> I called Fred today and he istructed me that for the steppers the
> OUTPUT_SCALE parameter is not used. His explaination is that it relates

to

> the feedback from a servo and from what I think I understood a "-" value
> here would reverse the direction of error compensation from input off the
> encoders.
>
> To change the direction the motor moves Fred told me to put the "-" in

the

> INPUT_SCALE entry as this controls the direction the motors move from
> controller input.

Did this work?

> > Reduce the DEFAULT_VELOCITY, DEFAULT_ACCELERATION, MAX_VELOCITY and
> > MAX_ACCELERATION parameters. Velocity is in inches per second and I

think

> > acceleration is in/sec/sec. I would think a velocity of 1 and an
> > acceleration of .1 would be a starting point for you (this is a guess).
>
> Feedback from Fred seems to indicate that right now the DEFAULT_VELOCITY

is

> hard coded in Xemc and this parameter is ignored. He said he would

compile

> an updated version that will read this parameter and put it on the FTP
> server.
> The MAX_ACCELERATION parameter is not used at all as gcode has no

commands

> to override the default acceleration, but Fred's suggestion was to set it
> the same as the DEFAULT_ACCELERATION.
> The MAX_VELOCITY figure should be what you get if you do a "G0" rapid

move,

> but in my playing so far I am not sure if this value is being

interpreted.

> Fred was going to take a look into it.

I've always set DEFAULT_ACCELERATION = MAX_ACCELERATION and
DEFAULT_VELOCITY = MAX_VELOCITY in the servo machines I've done and I was
able to control both parameters (accel & vel). The stepper code may take a
little fixing up, but I'm confident that Fred will be able to get you going
in a couple days.

Matt

P.S. What do you think your max feed rate will be?