Re: Heatsinking the G210's ??

Thanks Doug,

I guess I paid extra for a lot of options (which is good because I
haven't settled on software yet). 10 ipm would be terribly slow.
When this is all done, I'll probably make a page with all the in's
and outs of my particular machine (I wish everyone would do this).

Anyway, goo it and bolt it... err... ya but how to bolt it? If your
drives are like my drives (and I bet they are), then there is no way
to bolt from the top. The only way I could see would be to measure
the spacing between the original machine screws and pull them out and
bolt it from the back. That could be a real PITA since I'd have to
drill between cooling fins with concave "valleys". At this point I am
considering this a design flaw. Perhaps Gecko would create an option
of having that wafer with tabs you could bolt through.
I suspect I will get an answer that will prove that I'm totally
missing the obvious.

Sean

--- In CAD_CAM_EDM_DRO@y..., Doug Fortune <pentam@c...> wrote:
> "audiomaker2000" wrote:
>
> > Anyway, aside from now being TOTALLY lost on the multiplier
> > issue on the G210's vs the G201s (thanks all ;-) ), I am
> > preparing to mount the drives.
> >
> > I am planning to use the giant aluminum heatsink that is
> > original to the Bridgeport Boss (about 1' X 3.5'..yes, feet).
>
> At a worst case heat dissipation of around 13 Watts/driver
> (I think), that might be considered overkill. Just slap some
> compound goo on the bottom (too much is worse than none at all)
> and bolt it to something metal.
>
> > (BTW, I got the G210's because Master5 is on my list of
> > software I wish to try and I got the impression that 8xxx
> > steps per second via the motherboard timer might require this
> > "multiplier")
>
>
> Here is my attempt at explaining it:
>
> The G201 is straight forward, say you have
> a 200 step/revolution stepper. Since the
> G201 is a 10 microstep driver, it takes
> 200*10 = 2000 steps (from the computer)
> to cause 200 full steps to the motor.
>
> Therefore, 2000 steps from the computer
> program and the motor revolves once. Conversely
> the resolution is 1 step = 1/2000 revolution.
>
> Now imagine that you have the motor direct
> driving a 10 TPI screw.
>
> If you are using (for example, Master5) which
> currently has a maximum limit of 8000 steps/sec
> (actually 8192 exactly), then you can only
> turn the screw 4 times/second (8000 steps/sec
> divided by 2000 steps/revolution).
>
> And turning a 10 TPI screw 4 times a second
> only gets you 0.4" /second == 24 inches/minute.
>
> -------------------------
>
> If that is too slow, get a G210 step multiplier
> which (in *10 mode) generates 10 pulses to the
> driver, for every step out the parallel port.
>
> So now your machine goes 240 inches/minute,
> but unfortunately the resolution is 1/10th
> (ie more coarse) than what it was before.
>
> Or you can set the drive to *5 mode which will
> give you 120 inches/minute, with a resolution of
> 1/5 of what it was with the G201.
>
> Or you can also go to *2 mode giving 48 inches/minute.
>
> Or you can go to *1 mode, which gives the same as
> the G201.
>
> -----------------------
>
> However, I have a question for Mariss: using *10 mode,
> is the fault limit 13 'Times Ten' counts (ie 127/10)
> or is it still +/- 127 counts. In other words, if
> the motor shaft was fixed immovably in *10 mode, would
> the drive fault at 13 steps, or fault at 127 steps?
>
> regards
> Doug Fortune
> http://www.cncKITS.com
>
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