Re: Stepster

I know, but jogging 1mm or one unit is not enough, in metric you
must have 100 instead of 1 for the highest jog distance.
Ernst

Charles Gallo wrote:

> From: Charles Gallo <Charlie@...>
>
> Ernst,
> It's one "Unit". When you enter the change per step in Setport, it's
> based on those units. Lets say, for instance, you stepper motor moves the
> table .001 inch per step, so you enter .001. When you tell the table to
> move 1.oo, it pulses the motor 1000 times. If you entered .0254 for the
> offset, and you enter 1, it'll pulse the motor 39 times and move the table
> just below 1mm (and there will be an error of .37 pulses = .0094mm). It's
> all based on UNITS. If you spec all your distances in mm, it's mm, all
> inches, it's inches. All furlongs, it's furlongs. No problem
>
> The big question is, is 4 places to the right of the decimal point (radix
> mark) enough. The big problem is, the more places I end up going to the
> right, the smaller the max travel of the table is, and the slower the
> software is.
>
> Kevin wrote the software using floating point math. The problem with this
> is you get rounding errors, and it's SLOW. If I limit everything to .0001
> units (OK, so we might have a problem with wire EDM and surface grinders,
> but I can re write for that later), I can speed up the program. I could,
> without TOO much problem go to .00001, BUT it would require all current
> users to redo their config files (which stores everyting in .0001 units -
> aka, if you tell it that one step is .001 inches, it stores it as 10, but
> it CAN do 10.2)
>
> Charlie
>
> At 01:47 PM 10/13/99 +0200, you wrote:
> >From: Ernst Aardal <ernst@...>
> >
> >I hope you also will think about us metric people ower here.
> >In the jog menu you are using 1 inch if I am using 1 as jog distance
> >that is 1mm or 0.03937 inch??
> >Ernst
> >
> >Charles Gallo wrote:
> >
> >> From: Charles Gallo <Charlie@...>
> >>
> >> Hi Folks,
> >> After taking most of the summer off, I've been working again
> (and in fact
> >> Dave has an Alpha test version right now)
> >>
> >> One question for you. Right now, things like the step sizes and backlash
> >> numbers that you enter in setport can be ANY number of decimal places. In
> >> other words, if you really want to spec something to .000001 of an inch,
> >> you can. I think it would be reasonable to limit the resolution on these
> >> to 1/10,000 of an inch.
> >>
> >> Any objections? Anyone have any good reason not to do this?
> >>
> >> Charlie
> >>
> >> PGP Key Avalible upon request
> >> RKBA!
> >>
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> >> bill,
> >> List Manager
> >
> >>Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
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> >
> >
> PGP Key Avalible upon request
> RKBA!
>
> > Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the discussion of shop built systems in the above catagories.
> To Unsubscribe, read archives, change to or from digest.
> Go to: http://www.onelist.com/isregistered.cgi
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> bill,
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