Umm oh man, I've never done it, and I'm seriously rusty with C, but yes, I mentioned to hack the original CD driver to move the head.
After doing this, replace the head with some small pulleys, maybe from an inkjet printer. Sometimes you can get brass ones. This mechanism in sync with the rotation of the drum would create a CNC winder. I just know it's possible, but I couldn't pull off the C code side without some pain and loads of time. Consider feeding each rotation of the drum via optical sensor or hall effect to step the head as needed. Now I suppose what's better/easier than hacking the driver is driving the head via Arduino PWM. I think to keep the original assembly in tact would be an easier approach before deconstructing it. The mechanism I have has a metal frame, so it appears quite stable. I have one or two of these mechanisms around if you can't find one in the output buffer.
On 18 Jun 15, at 20:31, timothyhobbs@seznam.cz timothyhobbs@seznam.cz wrote:
How hard is it to control those motors? Are you simply pulling the stepper motor out of the cd drive and then using a normal stepper driver, or are you somehow re-using the cd drive's origional stepper driver as well?
---------- Původní zpráva ---------- Od: Mario Lombardo mario@alienscience.com Komu: Brmlab: Hackerspace Prague (main discussion) brmlab@brmlab.cz Datum: 18. 6. 2015 18:39:05 Předmět: Re: [Brmlab] Chido, Mrkva a dalsi tesla/radio-lidi: coil winder
Hi Tim.
Sounds like fun. I was looking at the pan for a CD/DVD player. It moves the laser head in place, and it's powered by a stepper motor. I think you've probably seen it multiple times. If your coil demands don't exceed the length of that shaft, I find it to be a worthy candidate for a CNC winder. The sides can be printed at the lab, so I imagine the tolerances would be sufficient, and the driver, easy to hack.
Each rotation of the coiling motor would correspond to a step(s) of the stepper unit, placing the wire to be wound correctly and then with either optics or a hall effect switch, send it back.
I would imagine something like this would already be online though, but I haven't looked yet. hmm
Oh, yes I know this wouldn't suffice for a tesla coil to impress the Teslak people :) In that case, I would use some parts from an inkjet plotter. Somehow, I remember we had one parked just outside the lab like a year ago or more? Regardless, they get retired from time to time.
If you can't get that precise for a large-scale motion control, I'd hack it with a shallow steel/aluminum I-beam and a belt.
We just had that copy machine cannibalized. It was tasty! Some very nice and powerful stepper motors in there. I took one for a lock. I've fallen in love with copy machines now--loaded with electromechanical parts!
On 17 Jun 15, at 20:52, timothyhobbs@seznam.cz timothyhobbs@seznam.cz wrote:
Hey,
I am looking at buying or building a coil winder and putting it in brmlab. It would be for normal round coils and not for toroids or anything fancy like that. I am going to use it for developing my braille prototypes, so I will be getting one of the ones for the thin wire sizes. I haven't decided if it will be a hand winder or a CNC winder. Do you tesla people/radio people have any requests for specific features/parameters?
Tim
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