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Type: Posts; User: lumberjack_jeff

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  1. Re: CNC cutter near Bellingham WA, anyone?

    I've looked at that site. I've considered building one for myself, but the cost of two cameras is a hurdle. I suggest mdf or marine ply rather than plywood.

    Yes, I'd be happy to cut out the parts...
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    Did you download...

    Did you download the 8.04 live cd? If so, write the iso file to a cd and boot from it.
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    This thread on the Mechmate site is a good...

    This thread on the Mechmate site is a good discussion of vcarving halftone images.

    MechMate CNC Router Forum
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    Outstanding. Thanks! So the formula for...

    Outstanding. Thanks!

    So the formula for finding the legs of a triangle when an angle and the area are known is;

    sqrt(2a/tanƟ) = b

    (Restating for the benefit of future googlers)
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    Trig formula for area

    What is the formula for solving for sides of a right triangle when the area and an angle are known?

    area = 10.5
    angle Ɵ = 15°

    area = 1/2 b*h.
    tan Ɵ=h/b

    therefore;
    b = h/tan 15°
  6. Where can I see photos of the nymph? Don't tease...

    Where can I see photos of the nymph? Don't tease us!

    The idea of a UHMW boat is really cool, but I doubt they'd let me in to the WB show with one. :D
  7. We're in SW Washington, interested in helping you...

    We're in SW Washington, interested in helping you out if you can't find someone closer.

    Cool and intriguing project. How expensive is the HMW-PE?

    This is the ticket for a drift boat.

    Welcome...
  8. Fitting encoders to a drafting machine

    Has anyone made a drafting machine like this one
    http://images1.americanlisted.com/nlarge/vemco_612_track_drafting_machine_150_claremore_9028622.jpg
    ...into a digitizer by attaching encoders to the...
  9. The shape of that part suggests significant...

    The shape of that part suggests significant allowable tolerance from the precise shape drawn. Attached are settings which consolidated line segments in the imported drawing quite a bit.

    But be...
  10. In my experience, Sheetcam does a good job of...

    In my experience, Sheetcam does a good job of turning line segments into arcs.

    Attached is a screenshot of my settings.

    Could you post a small dxf which demonstrates the problem?
  11. what do you use for cam software?

    what do you use for cam software?
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    The noise on the video sounds almost like I...

    The noise on the video sounds almost like I envision the sound of ballscrew bearings taking up for one missing ball on reversal. Not a "thunk" so much as a bunch of "clacks" a few microseconds apart....
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    No. Absolutely not too old. The job of the...

    No. Absolutely not too old.

    The job of the manager is different than everyone else's job. The manager's job is to build a business, not to build widgets.

    I don't think you need to be an expert...
  14. Be aware that a gantry spanning a cutting width...

    Be aware that a gantry spanning a cutting width of 60" will need to be significantly longer to accommodate the width of the Z apparatus.

    I would strongly suggest reviewing the mechmate site before...
  15. The corner speed (speed at which torque drops...

    The corner speed (speed at which torque drops off) is about 180 rpm for that setup.

    The corner speed formula is as follows: .191*V/I*A
    V=voltage (36)
    I=Inductance in Henries (.0272)
    A=amps per...
  16. Now I can! Just installed them, they work...

    Now I can!

    Just installed them, they work great. 500ipm is more than twice as fast as my previous setup, and the only apparent backlash comes from insufficient belt tension.

    :banana:
  17. Native english speakers like me often take...

    Native english speakers like me often take liberties with the language. I phrased the original poorly. Yes, what I meant is a rack and pinion machine with the stepper driving the pinion via a timing...
  18. I bought KL34H280 45 4A. $89. I can't give any...

    I bought KL34H280 45 4A. $89. I can't give any performance review yet, but I anticipate rapids of about 500ipm. I have a question about how well they'll work with my 57v power supply.

    I also don't...
  19. A shop bot (presumably at least 4' wide) able to...

    A shop bot (presumably at least 4' wide) able to mill aluminum, is going to be equipped with a heavy, robust gantry. The gantry on my MechMate weighs at least 200#. To accelerate that kind of mass,...
  20. Those motors are too small. You need at least...

    Those motors are too small. You need at least Nema 34.

    Selecting motors
  21. Highly recommend a thorough read of the MechMate...

    Highly recommend a thorough read of the MechMate website. You could simply build a mech mate gantry and drop it in place.
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    I built Mech Mate #31. It can be done without...

    I built Mech Mate #31.

    It can be done without breaking the bank.

    http://www.mechmate.com/forums/showthread.php?t=1789
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    The command line is the reason I'm fast with...

    The command line is the reason I'm fast with General Cadd.

    Strictly 2d though.
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    Thanks, this answered a big question I had about...

    Thanks, this answered a big question I had about how to control multiple spindles - e.g. multiple Z apparatus.
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    If the spindles are only 6" apart (c-c), 12"...

    If the spindles are only 6" apart (c-c), 12" additional travel is required to position each spindle within the working envelope compared to the use of a single spindle.

    Thus, a 60 x 120 machine...
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    Thanks, I assumed the 1x8 bar was steel. (.29# /...

    Thanks, I assumed the 1x8 bar was steel. (.29# / cu. in)

    If I were to build a (60x120 ?) machine with two spindles, the spindles would be aligned on the x-axis. Building extra-long x causes fewer...
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    Sheetcam's free trial will allow you to output...

    Sheetcam's free trial will allow you to output 150 lines of code.

    For small stuff, it's often enough.

    For me it was worth the $200 - it works really well and the developer does a good job of...
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    This is a huge machine. With an 80" wide gantry,...

    This is a huge machine. With an 80" wide gantry, I'd suggest boxing it somehow, or use a c-channel instead of plate. It also might allow you to reduce the 200#+ weight.

    Once you've guaranteed that...
  29. For many of the tools in my shop, it wouldn't be...

    For many of the tools in my shop, it wouldn't be problematic to shorten the cord from the tool end - remove the cord from the tool, shorten, then reattach. No need for a new plug.
  30. If you've determined that rack and pinion drives...

    If you've determined that rack and pinion drives and a tube steel gantry is the optimum solution, I don't understand why you want a "mechmate-like" design and not just build a mechmate.

    A mechmate...
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