Heatsinking the G210's ??

"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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