RE: [CAD_CAM_EDM_DRO] OOPS! Need bigger stepper motors

If I remember correctly Hans' boards are based on the L297 - L298 chopper
chip set. If so, you really do not want 12 V or higher motors, but low
voltage motors around 2 - 4 V that have a bipolar current rating of 2 amps
or less. I don't have the time to get into why you want lower voltage
motors, but just trust me on this. There is quite a bit in the message
archives on this and Mariss' Geckodrive site had a good white paper.

I would look at the Camtronics site for motors. Dan has some nice NEMA 34
units that would work well for you. I agree that you need bigger than 100
in/oz. I would second the recommendation of 300+ in/oz. I was using 550
in/oz units on my Shoptask, but they require more current than your board
can deliver.

Tim
[Denver, CO]

>
> Alan was gracious enough to suggest bigger stepper motors than 100
> oz/in. I still need a source for something along the line of 300
> oz/in, 12 or higher VDC (40 volts max). Anyone got any ideas? Alan
> the URL to Hans' home page is: http://hans-w.com/. I have run the
> system using small stepper motors and DANCAM and I am very happy with
> the performance, especially considering the total cost has
> been around
> $100.oo for everything needed to run 4 axis CNC. Except the motors
> and machine mods, of course. Hans' boards use L297 and L298 chipsets
> and the boards are capable of 4+ amps per motor and almost 45 VDC per
> motor. Overall I am very happy with Hnas' boards and would suggest
> them to anyone just getting involved in CNC. Just need a source of
> useful motors. Anyone have any experience with running steppers at
> voltages higher than their ratings?
>
>
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