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Type: Posts; User: jimbo

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  1. Replies
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    1,215

    I thought linear motors are essentially stepper...

    I thought linear motors are essentially stepper motors unrolled. The picstep guy, (Garfield?), has driven a linear motor with his picstep. Not sure if he had specialized firmware. ...
  2. Thread: ..

    by jimbo
    Replies
    17
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    2,140

    foam27, Thanks for the pictures. You did a good...

    foam27, Thanks for the pictures. You did a good job on that frame. Its funny, I have many of the same pieces. I am still in the parts acquisition and design stage. But I do have (4) 76" IKO LWHD...
  3. Thread: ..

    by jimbo
    Replies
    17
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    2,140

    foam27, I'd like to hear more about your machine...

    foam27, I'd like to hear more about your machine if you have the time. I am building something very similar. I have the same ballscrews and a 48"x60" work area. It will be a moving table design.
  4. Replies
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    2,082

    BoB C., Sounds like you are well on your way. I...

    BoB C., Sounds like you are well on your way. I would certainly be up for a meeting. I just moved in March and am now looking to start my router build up next month as well. Turns out my neighbor...
  5. Replies
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    2,082

    Hello all, I was wondering if there was any...

    Hello all, I was wondering if there was any progress on your routers. Jim.
  6. Replies
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    4,368

    sorry, thats what I meant. I was curious about...

    sorry, thats what I meant. I was curious about any synch issues with the slaved motors, either physical or software.
  7. Replies
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    4,368

    very nice bloy2004, did you have any difficulties...

    very nice bloy2004, did you have any difficulties with the dual ballscrews? You did a nice job.
  8. Thread: Free Software

    by jimbo
    Replies
    37
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    6,386

    another cad program ProgeCad LT,...

    another cad program ProgeCad LT, http://www.progecad.com/
  9. Thread: Easy EMC/EMC2

    by jimbo
    Replies
    15
    Views
    3,518

    unterhause, yes, fully aware of the bdi but they...

    unterhause, yes, fully aware of the bdi but they are usually a bit lacking with just the basics or out of date software. I have tried a couple of them, never liked the default software they...
  10. Replies
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    1,643

    style 3 is probably easiest to implement as...

    style 3 is probably easiest to implement as mentioned. but I am thinking of using a rail on top of the gantry away from z, then the second rail on the front of the gantry near the bottom. This puts...
  11. Thread: Easy EMC/EMC2

    by jimbo
    Replies
    15
    Views
    3,518

    sweet, I will try this also. thanks for hte link.

    sweet, I will try this also. thanks for hte link.
  12. Thread: DIY Linear Rails

    by jimbo
    Replies
    77
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    8,917

    abomb, I guess you are referring to me. I got...

    abomb, I guess you are referring to me. I got the rails at a local surplus store. Bought the rails one day, then the blocks 1 week later which were found in a different part of the store, that is...
  13. Thread: DIY Linear Rails

    by jimbo
    Replies
    77
    Views
    8,917

    Another link I have seen posted here before is...

    Another link I have seen posted here before is http://www.lmwatts.com/straightedge.html
  14. Thread: DIY Linear Rails

    by jimbo
    Replies
    77
    Views
    8,917

    Look at...

    Look at http://cnczone.com/forums/showthread.php?t=11024, it is the only diy router that I know using the metalized epoxy for joints and rails. He has a pretty good write up on his site.
  15. Replies
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    Wow, that's starting to look pretty sharp! Don't...

    Wow, that's starting to look pretty sharp! Don't know how I missed your last update. keep the updates coming.
  16. Thread: DIY Linear Rails

    by jimbo
    Replies
    77
    Views
    8,917

    Jerry, I did a little research. Found this site,...

    Jerry, I did a little research. Found this site, http://www.qtcgears.com/ and this guide in their library documents, http://www.qtcgears.com/Q410/QTC/Q410P392.htm. I don't understand the...
  17. Thread: DIY Linear Rails

    by jimbo
    Replies
    77
    Views
    8,917

    Jerry,I believe you have to order them with that...

    Jerry,I believe you have to order them with that option. The ends will be custom ground and matched from the factory. I think it would be difficult to do yourself.

    Part of the reason the linear...
  18. Thread: DIY Linear Rails

    by jimbo
    Replies
    77
    Views
    8,917

    Jerry, Makes sense. I didn't realize that gear...

    Jerry, Makes sense. I didn't realize that gear rack could be as good as 0.003 over its length. This is better than most rolled ballscrews, which are around 0.004 per foot. I have some gear rack,...
  19. Thread: DIY Linear Rails

    by jimbo
    Replies
    77
    Views
    8,917

    No the rails were bought at a local store. I...

    No the rails were bought at a local store. I found the rails in one part of the store and the blocks in another section hidden in a box. They had been there a while so I got a good discount. Hey,...
  20. Thread: DIY Linear Rails

    by jimbo
    Replies
    77
    Views
    8,917

    Unfortunately, just baby steps right now. I have...

    Unfortunately, just baby steps right now. I have a small plywood router that is almost up and running, just need to get z hooked up. It is only going to live long enough to make parts for better...
  21. yes, it has been used by a couple members here. ...

    yes, it has been used by a couple members here. Search for 8020 bearing on this site and you will find many threads...Can't comment on how well they work.
    ...
  22. Thread: DIY Linear Rails

    by jimbo
    Replies
    77
    Views
    8,917

    very cool, I can't imagine the effort it would...

    very cool, I can't imagine the effort it would take to build a plane. I am interested in a machine like this for doing car molds and maybe boats too. Definitely keep us posted...
  23. Thread: DIY Linear Rails

    by jimbo
    Replies
    77
    Views
    8,917

    Hello Jerry, those prices were from...

    Hello Jerry, those prices were from http://www.automation4less.com and http://www.technico.com/ respectively. I have never ordered from either of them, just stating the prices they have. If you do...
  24. Thread: DIY Linear Rails

    by jimbo
    Replies
    77
    Views
    8,917

    hello, just interested in this thread. Can i ask...

    hello, just interested in this thread. Can i ask why the gantry needs to be 1200 lbs? this is quite a bit of mass to sling around. Also foam would have basically zero resistance. Have you...
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    very cool. reminds me of this older site I saw...

    very cool. reminds me of this older site I saw which is very similar, http://freeandeasy.sourceforge.net/rotproto.php.
  26. Replies
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    very nice. one of the cleanest I've seen. ...

    very nice. one of the cleanest I've seen. please post your results when you get it running.
  27. nice find. You could use the timing belt to...

    nice find. You could use the timing belt to drive the axis, but I would only recommend for light materials such as foam and wood, not metal. If there are no setscrews on the pulleys then they are...
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    nc cams, yes, I agree backlash still needs to be...

    nc cams,
    yes, I agree backlash still needs to be accounted for even after the ballscrew has been mapped. The backlash I was referring to was using the two ballscrews side be side during a mapping...
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    nc cams, thanks for the info. I figured it was...

    nc cams,
    thanks for the info. I figured it was something as simple as that. What about using a higher class ballscrew to map it, ie have a stage with a servo. move (via computer) the stage a...
  30. Replies
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    Nc Cams, How does one map the lead error of the...

    Nc Cams,
    How does one map the lead error of the ballscrew? Is there an alternative to a laser inferometer? How can large distances be mapped without accumulating errors in the measurment?
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