Re: [CAD_CAM_EDM_DRO] emc input scale reboots

Tim,
Thanks! I reduced speed to 0.16 before satisfied ( able to run 120%
overrride ).
Works fine now, still a bit sluggish, and next step will be a faster
machine.
Thanks again.
TomP

----- Original Message -----
From: Tim Goldstein <timg@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, August 08, 2003 9:47 AM
Subject: RE: [CAD_CAM_EDM_DRO] emc input scale reboots


> > -----Original Message-----
> > I'm running EMC Linux 2.4.18rtai on a 166Mhz bix ( cuz my new
> > box was faster but couldn't run this kernel, and the new UniSTuttgart
> > bundle didnt include Steppermod or source :-( )
> > Anyways, I got it up and moving my ShopTask with 650 ozinch
> > steppers from Tim. I went to et the scaling factors, and laid
> > a dial vernier on the X way, Zeroed the machine and moved in
> > 0.1" on the dial
> > vernier. Then I got the reading from the DRO, it was 2", so I went
> > back and checked, make the machine move 1 step using testppt,
> > ok, it's true I got "half tenth' steps, 1 step is 0.00005".
> > No big deal, just a number, so enter Input_Scale as 20000,
> > right? it takes 20,000 steps to make 1 inch? well the machine
> > rebooted just before the TK_EMC screen appeared. Many times.
> > I changed the number to 10,000 and got a very sluggish, but
> > working system that gives me 1/2 scale output. What to do?
> >
> > BTW: thanks to the EMC guys for making such a nice package. I
> > see a lot of rants, and then I whine, but they did a great job!
> >
> > regards, TomP
>
> Try reducing the MAX_VELOCITY in each individual axis section and in the
> TRAJ section to 1/2 to 1/3 of whatever you have. Then you should be able
> to increase the steps per unit to the 20,000 you need. Not sure if this
> is correct technically, but EMC with freqmod.o seems to load the
> processor based upon the product of steps per unit x max velocity. If
> you get it too high it croaks. So, by dropping your max velocity you can
> crank up the steps per unit. Not sure what you have there, but 60ipm is
> plenty on a Shoptask so a setting of 1 in the individual axis max
> velocity and something like 1.5 in the traj will work just fine. Now it
> may still be too much for a 166 in which case you need to reduce the max
> velocity to a usable value for that system. I would suggest you consider
> a faster computer.
>
> Tim
> [Denver, CO]
> Sherline & Taig products at Deep Discount
> Mach1 & DeskCNC with credit card ordering
> www.KTMarketing.com/Sherline
> e-mail me at Timg @ KTMarketing.com for items not yet listed
>
>
>
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