Alt-BEAM Archive

Message #11066



To: beam@sgiblab.sgi.com
From: Richard Piotter richfile@rconnect.com
Date: Mon, 28 Feb 2000 20:53:31 -0600
Subject: [alt-beam] Re: mini walker


Would one of those major henry coils put more kick wound as it is, or if
it were wound into a more compact form?

The major henry coils are like the following:
_____
|| / \
|| / ,-. \
|| | | | |
|| \ `-' /
|| \_____/


The robot I'm woking on needs the kick those major henry coils put out,
but the space is limiting. It'd be much easier to have a could shaped
like the following:

______ ___
| | / \
| | | O |
|______| \___/

Is there anything special to winding coils? would the major henry coil
have as much kick as it curently does if it were rewound like the lower picture?

I appreciate any advice. I need that kick, but space is limited. I'm
using Radio Shack Part # 64-1895 Rare Earth Magnets. I need the coil to
be able to pull and repel the magnet across about 1/4 inch horizontal
movement. The coil works, but it simply is too large (diameter wise) for
my project. 3/8 inch is the maximum diameter that will work without the
core being off center from the magnets.

Have any advice?

Thanks!



Dave Hrynkiw wrote:
>
> At 10:29 PM 2/27/00 , Richard Piotter wrote:
> >Your "major henry" coils... Can they be unwound and then rewound on a
> >new core without damaging the enamel coating?
>
> ...I think so. I regularly "pull" off wire from the coils to make longer
> leads. But the re-winding portion is a nasty bit'o'business. Not fun to
> spool it up and try to re-glue the windings. What you have in mind?
>
> >How fast do those things
> >usualy trigger in a Solar Engine like a Magbot?
>
> Same time delay as any other SE - depends on the voltage trigger, cap size,
> and sunlight. But in regards to discharging, they're just as quick as a
> motor. After all, they're what - 13 ohms?
>
> >What size solar panel
> >would you recomend to drive a Bicore and and SE that is time triggered
> >off the Bicore?
>
> ...to drive a bicore and a SE? I'd probably want to stick with the 5V
> cells, being the 3733 & 3766, as the '240s all run better on higher voltages.
>
> Regards,
> Dave
> ---------------------------------------------------------------
> "Um, no - that's H,R,Y,N,K,I,W. No, not K,I,U,U, K,I,_W_. Yes,
> that's right. Yes, I know it looks like "HOCKYRINK." Yup, only
> 2 vowels. Pronounciation? _SMITH_".
> http://www.solarbotics.com

--


Richard Piotter The Richfiles Robotics & TI web page:
richfile@rconnect.com http://richfiles.calc.org

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11067 Tue, 29 Feb 2000 15:16:04 +1100 (EST) [alt-beam] Re: Diskette Drives beam@sgiblab.sgi.com Ben Hitchcock Oops, forgot that I put some 1k resistors in series with the outputs of
the 74HC14. No wonder the torque wasn't special!

Maybe you could try a 74xx240 or something similar.

Ben

> Hi,
>
> > Stepper motors draw a fair amount of amps, depending on the voltage and size of
> > the motor. This makes it very difficult to power with an SE. Also most steppers
> > only move around 7.5 degrees/pulse. So you need somekind of driver. So far the
> > simplest driver I've found still needs a min. of 2 ICs, a driver and a 555
> > timer.
> > Plus the motors aren't much cheaper than the geared motors that are out there
> > on the market for ready sale. By the time you add the driver and timer to
> > generate the pulses it is more expensive. Complete driver boards, in kit form,
> > run around $30.00 Canadian for a good one, no motor. And a driver can only run
> > one motor at a time. If you have the coin to spend...
> >
> > Does anyone else know of a stepper motor driver that is simpler? Or cheaper?
>
> I've used a microcore to drive a disk drive stepper motor directly. The
> torque was abysmal, but it did spin reasonably well. Mine had six leads-
> two sets of three. Just keep swapping 'em around until it spins around.
> Also, pinch some tape onto the motor shaft to see what the shaft is doing.
> Otherwise it just goes 'tick tick tick' and you can't see whether it's
> spinning or just oscillating back and forth.
>
> Chip: one 74HC14
> Components: six 0.22 uF caps, and six 1Meg resistors. And a 3V supply.
>
> If you really desperately want to get it going then try it otherwise don't
> bother. Most DC motors far outperform this setup.
>
> Ben
>


--
Nothing is foolproof to a sufficiently talented fool.



11068 Mon, 28 Feb 2000 23:05:55 -0600 [alt-beam] Re: Re:Diskette Drives alt-beam@egroups.com Ben A Micklin Cool. Is it hard to build?

~ben~


On Mon, 28 Feb 2000 21:18:39 EST Blumojo13@aol.com writes:
> http://www.ohmslaw.com/robot.htm
> This is a site for a floppy drive robot. I'm building one now.
> blumojo13
>
>
------------------------------------------------------------------------
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> http://click.egroups.com/1/2042/5/_/5594/_/951790948/
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