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Old 10-20-2007, 02:11 AM #1
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Default Floppy drive stepper motor scanning system

Parts:

2x 5.25" Floppy drives - the kind with the nice stepper motors
1x Parallax BASIC Stamp II Microcontroller
1x Laser
2x Mirrors
1x Old AT computer PSU

Using a pinout from the internet you can convert old floppy drives into stepper motor controllers - once converted they have 2 logic inputs, one for direction and one for stepping. I glued two small mirrors to the motors and Attached the motor driving boards to my microcontroller. Then with enough imagination and programming probably any number of designs and effects could be created for this system.

There are several major drawbacks to a system like this compared to real galvos. Stepper motors have a set "resolution" of sorts since they are only able to make a certain number of steps per revolution compared to galvos which move proportionally to the amplitude of an analog input signal. The second drawback is scanning speed. As you can see from the following pics when the scanning speed is increased the image begins to distort as the motors are unable to keep up with the scanning.

But heck, it's more fun than just a spirograph since you can do text and beamshows

Ok, onto the pictures
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Floppy drive stepper motor scanning system-sta71697.jpg  


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Old 10-20-2007, 02:11 AM #2
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Default Re: Floppy drive stepper motor scanning system

setup
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Floppy drive stepper motor scanning system-sta71698.jpg  
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Old 10-20-2007, 02:12 AM #3
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Default Re: Floppy drive stepper motor scanning system

running
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Old 10-20-2007, 02:12 AM #4
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Default Re: Floppy drive stepper motor scanning system

max microcontroller operating speed
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Floppy drive stepper motor scanning system-sta71695.jpg  
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Coherent Innova 90 argon ion water cooled ??W (got plasma, alignment in progress)
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(9:03:50 PM) Picasso: the best guys i saw ever at burning man was two dudes dressed as all green army men shooting pants at naked guys
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Old 10-20-2007, 02:24 AM #5
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Default Re: Floppy drive stepper motor scanning system

Dude - THAT is awesome ! Where did you come up with the idea ? Post some source code, and "stamp" programming instructions ?
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Old 10-20-2007, 03:22 AM #6
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Default Re: Floppy drive stepper motor scanning system

Quote:
Originally Posted by SenKat
Dude - THAT is awesome ! Where did you come up with the idea ? Post some source code, and "stamp" programming instructions ?
the idea came from when i had taken apart a drive a while ago for use with my microcontroller for little automation type things, but then i thought of getting another for an XY scanner - unfortunately this was all programmed step for step so the entire program code would be thrown out for a new design - i hate programming so i wasn't able to make an actual easy interface for it.
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Coherent Innova 90 argon ion water cooled ??W (got plasma, alignment in progress)
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Old 10-20-2007, 04:38 AM #7
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Default Re: Floppy drive stepper motor scanning system

I remember when you showed this to us on IRC. I don't think I could do something like this on my own from scratch any time soon.
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Old 10-20-2007, 06:40 AM #8
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Default Re: Floppy drive stepper motor scanning system

that is really good for steppers man! my rgy uses steppers, and with it down really slow, i can write out "welcome", but it does the individual letters, so you can't read it, but when you speed it wright up, it gets a wobbly and unstable. almost like it looses quality with speed?
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Old 10-20-2007, 09:05 AM #9
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Default Re: Floppy drive stepper motor scanning system

Dam thats a cool idea, its like a 2K scanner ;D a mini scanner
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Old 10-20-2007, 09:30 AM #10
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Default Re: Floppy drive stepper motor scanning system

a 2K very unstable scanner! ;D ;D
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Old 10-20-2007, 09:33 AM #11
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Default Re: Floppy drive stepper motor scanning system

Well not bed considering it's made of scrap ;D a dodgy 2k scanner
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Old 10-20-2007, 10:32 AM #12
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Default Re: Floppy drive stepper motor scanning system

Hmm, im trying to make boomdogs x/y scanner and thought of using floppy drive motors but that has put me off them a little now. Looks cool making the text but I would rather have it smoother.

Nether the less, have fun with it!
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Old 10-20-2007, 11:02 AM #13
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Default Re: Floppy drive stepper motor scanning system

Could anybody please tell me what the "K" stands for? Or at least give me a search term for google?
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Old 10-20-2007, 11:12 AM #14
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Default Re: Floppy drive stepper motor scanning system

K is for thousands. So a 10K scan speed can do 10,000 positions per second. The higher the speed you can do more complex and smoother animations.

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Old 10-20-2007, 11:15 AM #15
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Default Re: Floppy drive stepper motor scanning system

It represents the speed of a scanner, the higher the the kpps the better the image or scan. The "k" represents thousand, eg. 30K is actually 30 000. pps got no clue, most probably pixel per square or something like that.
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Old 10-20-2007, 11:16 AM #16
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Default Re: Floppy drive stepper motor scanning system

Oh right makes sense now ;D
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