Re: Hey Tim!

> From: "Tim Goldstein" <timg@...>
> The page you are remembering was to calculate the CYCLE_TIME value for EMC
> based upon the steps/in and the MAX_VELOCITY. I have removed it from the
> links on my site as Fred now has EMC figuring this value for you behind the
> scenes.

Thanks! I was beginning to think I was hallucinating!

> The value you get from the new calculator page is really steps/unit. If you
> put in the lead screw value you want as lead screw turns per desired unit

of

> travel the page will spit out the INPUT_SCALE value you need which is just
> the steps/unit. Meaning, if you put in the turns per inch of table travel
> you will get back the steps required to do that. If you put in the turns

per

> millimeter you get back steps per millimeter and yes, decimal numbers will
> work just fine as you discovered.

Attention Ian Wright: The above paragraph may apply to you with respect to
working with metric coordinates, although I don't know what to say about G20
and G21. I'll have more metric related info when I talk with Fred, hopefully
tomorrow.

> I have notice that the larger stepper motors seem to have certain
> frequencies at which they are sensitive to acceleration rates and if you
> keep them at these frequencies they are susceptible to loosing steps. It
> seem the faster the acceleration you can get away with the better.

That's why I'm eager to get this machine all put together to see what kind of
performance will be practical to achieve. The stock stepper driver circuitry
delivers 75inches/minute, but the accel/decel ramps are observably long.

> Sorry to hear about the transformer. Better it smoked now then when you

were

> cutting something important.

Hey, it's only money (gulp)! This machine is a build-it-to-sell-it project,
so I want to make all the mistakes by myself and not in front of the client
(whoever that turns out to be). I'm planning on putting quite a few hours on
it once it's up and running, mainly with wax & plastic to minimize the mess,
to prove its reliability.

Thanks Again,

Matt