Page 1 of 2 12 LastLast
Results 1 to 10 of 12

Thread: My first beam switch

  1. #1
    Join Date
    Mar 2006
    Location
    Massachusetts
    Posts
    194

    Default My first beam switch



    Simple stepper motor. I made a controller using 1 PIC16F628 and a ULN2803 Darlington Array. And some really bad code. I did manage to fit two steppers on one PIC.

    I have come to the realization this weekend that in this hobby you have to learn a lot more than just how to work with lasers. I've had to teach myself how to work with metal. I've never even done any serious wood working.

  2. #2
    Join Date
    Jan 2006
    Location
    Charleston, SC
    Posts
    2,147,488,500

    Default

    Cool...

    That looks just like the steppers you see on E-bay all the time - the ones advertized as "laser galvos" for like $25... Is that where you got it?

    Adam

  3. #3
    Join Date
    Mar 2006
    Location
    Massachusetts
    Posts
    194

    Default

    haha No! Those over priced crap! Nope I got them from an electronic surplus site. I got 10 of them for like $7.50

  4. #4
    Join Date
    Jan 2006
    Location
    Charleston, SC
    Posts
    2,147,488,500

    Default

    So with the controller, I'm guessing you've got about - what, $5 invested in each *pair* of steppers? (Less?)

    You send a TTL (+5V) signal to the controller and it flips the stepper... Assuming you put a lightweight mirror on the end, you've got your beam table actuator. Cool... How fast can you switch them? (Spring return? Or does the controller "step" the motor back when you loose the TTL signal?)

    I might be interested in this idea if I get one of my larger Argon's working... I'd like to build an old-school beam table, and this might be the way to do it. (Sure beats a shitload of GM20's)

    Adam

  5. #5
    Join Date
    Jan 2007
    Location
    Florida
    Posts
    4,382

    Default

    Are you building scanners with mirrors or a beam blocking on-off flag switch?

  6. #6
    Join Date
    Mar 2006
    Location
    Massachusetts
    Posts
    194

    Default

    Buffo:
    Yeah TTL from 4 to about 12V. When on step 4 and Hold when off step back 4 and Hold. This is where I got my idea http://www.laservisuals.com/optact.htm

    And yeah these guys are on my Argon for a simple old-school beam table. At ab out $7 for 2 steppers and controller it's cheap. They do about 10 to 15 switches per second. They are pretty strong. I want to make 2 more and I'll have a video up.

    steve-o:
    No Way Man! Just On-Off or bounce mirrors and maybe even put a filter to single out wavelengths.

  7. #7
    Join Date
    Jan 2006
    Location
    Charleston, SC
    Posts
    2,147,488,500

    Thumbs up

    Very cool!

    Keep us informed of your progress on this, please. I'd really like to do something just like this - assuming I can get one of these big argons going. I especially like the price!

    Adam

  8. #8
    Join Date
    Mar 2006
    Location
    Massachusetts
    Posts
    194

    Default

    Here is the Schematic. Don't laugh! This is actually my first shot at drawing one.

    http://www.djdevnull.com/upload/bs.jpg

  9. #9
    Join Date
    Jan 2006
    Location
    Charleston, SC
    Posts
    2,147,488,500

    Default

    That looks easy enough to assemble. Programming the PIC is another problem, but I'm nowhere near that stage yet.

    What would you charge for a set of 20 of these things (10 boards, 20 steppers) already programmed and soldered? Just curious... (There might be more interest in this idea here.)

    Adam

  10. #10
    Join Date
    Mar 2006
    Location
    Massachusetts
    Posts
    194

    Default

    There is a reason why there $75 ya know.. Parts are nothing. Labor is expensive. I would sell you some PICs preprogramed but it takes me like an 2 hrs to solder all that plus crimp ends. The minimum I'd charge is like $25 and hr at that rate just buy some.

    But yes it's a simple circuit. I'd even program the chips for you. But if we can get some more ppl I can get printed circuits made. Then I could solder one up in about 15-30 min. So anybody else in?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •