Re: [CAD_CAM_EDM_DRO] Re: supertech

Paul Kelly wrote:

> OK, so how does the new guy spot a lemon?
>
> My sugguestion is to look at the DC supply voltage. If its much less than
> 24V then you're probably not looking at a good chopper drive.
> Isolation is another good indicator of a quality product. Although you can
> stuff it up with cheap(slow) opto-couplers.
>
> I do think the term "performance" is used non specifically. Defining the
> problem is really the crux of the issue.

I think it would be nice to start recording what performance people are seeing
from the various drivers. I am getting reports of 400 to 450mm/min on the Taig
table using Xylotex drivers at 28V-bipolar while I am getting a good 600mm/min
with the Taig/MicroProto controller running 60V-unipolar. The Taig/MicroProto
closed loop controller will give 1500mm/min with the same stepper motor
driver. I have yet to get the Chinese drivers hooked up to test them, but I
have had the L297/298 pair running at 24V and giving 300mm/min driving one
pair of the unipolar wired taig motors.

This obviously all depends on the 'load', motor, power supply and driving
software, but I'm sure we can start to put together some realistic figures for
the various options of driver, and perhaps pull out combinations that simply
don't go, and onces that work well?

--
Lester Caine - G8HFL
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