Re: [CAD_CAM_EDM_DRO] Re: supertech

Lester Caine wrote:

> 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.

I put some small servo motors on a Taig and got 120 IPM (3000
mm/min). That was a direct-drive connection to the stock
leadscrews.

I had some old-style NEMA size 34 stepper motors on the 150-Lb
minimill, direct-drive to the stock leadscrews and got 90 IPM (
2250 mm/min) using Gecko 201A drives and a 50 V power supply.
This was with my Universal Stepper Controller as the source of
the step pulses, and EMC1 as the CNC program.

Jon