RE: [CAD_CAM_EDM_DRO] Re: Big servo motors drive recommendations

Baldor drives are quite good, expensive new. We use them on big surf board
shapers with analogue PC drive cards.



A pixie card should drive them OK, and the SEM motors sound as though they
are the same as mine or thereabouts, they seem to go on forever with very
low brush wear.

The spares guys advertise the motors for £1000 a piece second hand, I don’t
know whether they sell many, I did think I could sell mine and put brushless
on for that money.



If you have a spare SEM motor kicking around, I would be interested in it is
the price was good. £1000 is obviously ridiculous.



Dr. Mark Vaughan Ph'D. B.Eng. M0VAU

Managing Director

Vaughan Industries Ltd, reg in UK no 2561068

Water Care Technology Ltd, reg in UK no 4129351

Addr Unit3, Sydney House, Blackwater, Truro, Cornwall, TR4 8HH, UK.
Phone/Fax 44 1872 561288

RSGB DRM111(Cornwall)

_____

From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of John Stevenson
Sent: 28 May 2007 12:24
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: Big servo motors drive recommendations



Forgive me for mentioning this as I'm no electronics expert.

Over the past 4 years I have scrapped out 5 large laser cutting
machines with 5'x 10' beds.
Most of these were on SEM servo's 140 volt 56 amp peak and were
controlled by Baldor servo cards.
I still have the Baldor book somewhere. Now the brief on these
machines was some spares were kept but the rest went under the hammer
- literally as they didn't want the machines going onto the S/H market.

Some motors were saved, some sold and the drive cards sold. The cards
made absolute peanuts on Ebay and Niel Ginley at Pennine Automation
was paying £20 a card.
From memory as I don't have any cards here but there may still be some
in a cupboard at the laser co. these were very simple with no chips on
board.

Is it possible to either buy cheaply or make some board to this spec
and drive them via a step and direction board.
They were easy to tune, three pots in fact most boards had cheap
multimeters left connected up so they could be tweaked when needed.

John S.





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