RE: [CAD_CAM_EDM_DRO] stepper driver help

Most importantly, what screws are you using. They, more than anything
determine the required characteristics of the drive and motor.
PK

-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of hannu
Sent: Thursday, 27 September 2007 4:37 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] stepper driver help

Gecko 201? About 100 $ see www.geckodrive.com
8 amps, very good.

There are no restriction on using 2a bipolar chopper drives w. nema23
motors.
The amps you can drive determine your torque.
The volts determine your maximum speed & acceleration.

What drives have you found ?
There are very many drivers on the market, what is your main concern/goal ?
Cost ? Reliability ? Support ?
A kit you solder ?
It may help if you let us know what motors You have found.
Of real interest, the most useful thing about them, is to know
their speed/torque curve, nominal volts and inductance.

Ideally, you want motors that have maximum torque and speed in rpm.
If possible, you should use motors that go to 1000-2000 rpm.
A motor that will spin at 2000 rpm will be very much better.
The difference may well be five-fold or more.

Your sensitivity or not, price-wise, is also a point to consider.
Is this for a lathe, minimill, or something else ?

Best, h.

> My conversion project is going pretty slow right now- I am searching
> around on the net reading everything I can, to learn about what I am
> doing. Educated types might even call what I am doing reasearch...
> not sure if it is though as it is pretty fun so far :>
>
> Anyway, I had a lot of really good advice when I first posted- I
> hope I did not offend any of you with repeditive questions!
>
> I have also been hunting high and low for a bipolar stepper driver
> circuit that will go more than 2A, but they seem to be rare devils!
>
> I have found two 2A bipolar drivers and I keep wondering what the
> restrictions will be if i use them with Nema23 size motors. I know
> this is a difficult question to answer, but can anyone give me a bit
> of insight here?
>
> Thanks,
> Stefan
>
>

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