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Old 10-30-2009, 10:06 AM #17
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Default Re: Building a scanner.

Keep in mind, those pics Mario took are most likely long exposures, you would be able to see them scanning that in real life.


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Old 10-30-2009, 10:09 AM #18
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Default Re: Building a scanner.

Thats cool. i just want to know the motors he used. i am not looking for high grade that will be much later. this is me getting my feet wet.
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Old 10-30-2009, 12:02 PM #19
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Default Re: Building a scanner.

LOADING..... god!
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Old 10-30-2009, 06:45 PM #20
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Default Re: Building a scanner.

I used motors and drive circuits from old floppy drives, I'm sure you could get better performance if the motors were driven harder. I had to program each step manually in PBASIC to the microcontroller, there was no interface or anything.

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Old 10-30-2009, 07:53 PM #21
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Default Re: Building a scanner.

Wow i got lots of old floppy drives heck i will try those first as that make this free then.
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Old 10-30-2009, 08:48 PM #22
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Default Re: Building a scanner.

they came from 5.25" drives, you have to make sure the motor is the right kind since newer drives have really cheap motors that won't work once you take them out of the little holder
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Old 10-30-2009, 08:56 PM #23
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Default Re: Building a scanner.

hmm. i got only newer drives the oldest i got is from a windows 95 cpu.
So as far as motors for this do i want a 1.8 or a 2.7 deg of step? I take it that i want to get the smaller motor around the size of 1 x 1.
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Old 10-30-2009, 10:02 PM #24
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Default Re: Building a scanner.

You want to get a motor with the smallest steps possible, this will give you more usable resolution for the output images. Also, see the red grid I made in the pics? That's about the only lines I could create. Although it can also do slanted lines by sending step pulses to both motors at the same time. But they can't just go anywhere like galvos.
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Old 10-30-2009, 10:20 PM #25
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Default Re: Building a scanner.

Thanks so much for the help. i look forward to posting my results of this build.
i must say i would never recommend doing this unless you already have all the stuff.
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Old 11-17-2009, 08:10 AM #26
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Default Re: Building a scanner.

Step Motor is not very good for Animation Laser.

It suit for beam laser light Show.
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Old 12-14-2009, 02:10 PM #27
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Default Re: Building a scanner.

After some searching i have found out some info on using steppers that make me wonder about how would i go about using them.
1. get the largest step possible.
2. the most steps per second.
3. put constant current on one of the coils to act as an electronic spring.
4. Use a varying ac audio amp to power the other coils.
when using the amp make sure the power is set just high enough not to break away from the holding coil.

I have found a motor with a 7.5 deg of step thus i could get around 14 deg of motion easily. (don't want to break away from holding coil so leave the .5 as a buffer.)
It might seem that using a cnc controller is over kill but i could use a cpu 5.1 surround sound card. but what controller to use.

What mods would i have to do to the card to get it to output enough power to turn the motor?
Any software use sound?
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Old 12-14-2009, 11:39 PM #28
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Default Re: Building a scanner.

If you're going that route, you'll need an external amplifier like a stereo or dedicated audio amp. No current software (except some really old one I think for macintosh computers) use this type of output system. Even then all you're going to be able to draw is some scribbles or lissajous figures.

Commerical stepper units actually step the motors with a stepper motor driver, and a controller to send the step/direction signals. You can make basic shapes and some text this way. Otherwise you really should be looking into some commercial scanners.
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Old 12-15-2009, 12:28 AM #29
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Default Re: Building a scanner.

Quote:
Originally Posted by kiyoukan View Post
After some searching i have found out some info on using steppers that make me wonder about how would i go about using them.
1. get the largest step possible.
2. the most steps per second.
3. put constant current on one of the coils to act as an electronic spring.
4. Use a varying ac audio amp to power the other coils.
when using the amp make sure the power is set just high enough not to break away from the holding coil.

I have found a motor with a 7.5 deg of step thus i could get around 14 deg of motion easily. (don't want to break away from holding coil so leave the .5 as a buffer.)
It might seem that using a cnc controller is over kill but i could use a cpu 5.1 surround sound card. but what controller to use.

What mods would i have to do to the card to get it to output enough power to turn the motor?
Any software use sound?

My first scanner was built as you describe using steppers. But, I used a microcontroller instead of a sound card. It was a fun project but pretty worthless for anything but very very very basic shapes (ie a square or a line)
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Old 12-15-2009, 12:18 PM #30
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Default Re: Building a scanner.

So it still seems using my micro controller from my cnc machine will be the best way to drive them. Now i just need to find the motor with the most steps per second.
How many steps or equivalent does a sp20 go?
if i could get a step per second of 1000 that would be over kill for a beam show but maybe just enough to write letters?
i know i am not going to get any where near the results of a sp20 but i just would like a benchmark.
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Old 12-15-2009, 03:39 PM #31
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Default Re: Building a scanner.

Quote:
Originally Posted by kiyoukan View Post
So it still seems using my micro controller from my cnc machine will be the best way to drive them. Now i just need to find the motor with the most steps per second.
How many steps or equivalent does a sp20 go?
if i could get a step per second of 1000 that would be over kill for a beam show but maybe just enough to write letters?
i know i am not going to get any where near the results of a sp20 but i just would like a benchmark.
You also want to get the one with the most steps per revolution. This will increase your resolution for drawing images.
There is no "step equivalent" for the SP20, they are completely analog.
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Old 12-16-2009, 01:16 AM #32
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Default Re: Building a scanner.

I used stepper motors with large steps and only varied between one step. It was easy to make it work that way.
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