Re: [CAD_CAM_EDM_DRO] Re: Stepper motor from Sherline?

For the 2A drivers I restricted the max supply to 18VDC s only because I use
a 7805 for +5. With 18VDC input the 7805 gets warm with 24VDCV it gets very
hot. I have run the 2A drivers up to 38VDC. But I used a separate 5vdc
supply for the logic. You could also use a large but inefficient dropping
resistor in series with the 7805 input and use 24VDC.
Dan
-----Original Message-----
From: Randy Gordon-Gilmore <zephyrus@...>
To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
Date: Wednesday, November 01, 2000 2:01 PM
Subject: [CAD_CAM_EDM_DRO] Re: Stepper motor from Sherline?

>Mike, Tim and Alan,
>
>Thank you for your encouraging replies. I will order 3 of the motors later
>this week. Did I convert the 9.7kg-cm holding torque wrong, Alan, or is
>there some derating?
>
>I do have one Eastern Air Devices LA23DGK-2 motor rated at 4.8V, 2.00A,
>210oz-in holding torque when connected bipolar, which I could use for the Z
>axis. But with my spring counterbalance, I might not bother. Is there
>such a thing as using *too* powerful a motor?
>
>It looks like Dan Mauch's chopper driver would work for these, except for
>the 18V limitation... Dan, if you're reading this, what would I need to do
>to use 24V with your driver? Would it be a heat dissipation issue or are
>there other component limits?
>
>Best regards,
>
>Randy
>
>Randy Gordon-Gilmore ,----.___________ ______________ _________________
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>
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