Re: [CAD_CAM_EDM_DRO] Deskncrt with step motor encoder feedback

And although Carken likes to sell the DeskNCRT with another
one of thier programs, Carl says they will sell it individually for
$90.

Steve

----------
From: Dan Mauch <dmauch@...>
To: CAD_CAM_EDM_DRO@egroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Deskncrt with step motor encoder feedback
Date: Friday, June 16, 2000 10:34 AM

I have finally tried the new deskncrt with the Camtronics Inc (that's me)
Dro board and wow! It works like a poor man's servo system.
I'm impressed!
It turned out that setting up the stepper motor encoder feedback was
fairly easy. Simply plug the DRO PCB into the PC. Connect the DRO board to
the stepper motor encoder .
Configure the software for encoder feedback.
I have to admit that I needed a bit of help from Carl at Deskam to
configure
the Min_output/Max_output. But within a few minutes after sending a email
to
Carl, I got the info I needed.
I ran a file called seahorse.tap three times. and with a pair of pliers
cause the motor to stall several times. When It finished the file the motor
was back at the original location.! I tried it three times with identical
results.
Be aware that this is not a panacea. The motor ended up at the start
location . As I cause the motor to stall the speed increased to recover so
I
am not sure what the part would have looked like on a real machine. If the
motor could not recover then I would get a following error message and the
motors would stop until reset. But it looks really promising.
Deskncrt look like a diamond in the rough. It really looks like it has
great
potential. The encoder feedback combined with the 150+ lines of look ahead
together wilt all the G codes that it runs makes this a slick program.
If you have tried it d/l a demo copy from www.deskam.com and check out his
other programs while your at it. For those interested in the dro board my
web site is www.seanet.com/~dmauch
Are there others that have tried the encoder feedback with deskncrt or EMC?
Dan

-----Original Message-----
From: Mariss Freimanis <geckohall@...>
To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
Date: Friday, June 16, 2000 9:23 AM
Subject: [CAD_CAM_EDM_DRO] Just an idea

>Has anyone used a battery in conjuntion with a servomotor power
>supply?
>
>Reason for the question:
>
>Brush DC servomotors have peak torque values that are up to 10 times
>their rated continuous torque, thus peak current draw can be up to 10
>times the continuous draw. This peak current event can last from 10
>millisec to 1 second and the duty cycle must be under 10% to stay
>within the motor's dissipation rating.
>
>Unfortunately the power supply has to be sized to this peak power,
>when on average a supply 1/10 the size would do.
>
>My idea would be to use a small NiCad or NiH battery connected to the
>power supply output bus via a diode. During a high current pulse the
>power supply voltage would sag, the diode would forward bias and pick
>up the load for the duration. A quick-charge IC would handle the
>charge restoration to the NiCad between the pulses.
>
>Even little AA .5 AH NiCad cells would do; a 25 Amp, 1 second load
>would discharge only .007 AH (25Amp / 3600 sec). The internal
>resistance of a Nicad cell is on the order of .02 ohms, so they are
>quite capable of supplying this level of current.
>
>It seems a 100 watt supply / battery combo could replace a 1kW
>supply. Has this been done before?
>
>Mariss
>
>
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