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  1. Replies
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    769

    I've often thought about just what you did but...

    I've often thought about just what you did but never got around to it. The voltage drop across a silicon diode junction is approx .7 V but the drop across a diode in a circuit tends to be more like...
  2. Thread: ASTM A36 Steel

    by ss_user
    Replies
    23
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    65,797

    In a broad sense A36 chem spec is about .1%...

    In a broad sense A36 chem spec is about .1% higher in C and .3% higher in Mn than 1018. The range of permissible analysis is rather large for both steels. As for the chemistry of Chinese A36, etc...
  3. Replies
    27
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    25,423

    The really good cnc hobbyist runs linuxcnc;...

    The really good cnc hobbyist runs linuxcnc; somewhat more geekie. Which is why is is not predominate in the commercial world. There are a few commercial shops running linuxcnc plus a well known CAD...
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    17
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    2,223

    Mineral colors are available for tinting...

    Mineral colors are available for tinting concrete. It gets troweled into the top surface of the pour. I suspect the example I saw was plain iron oxide; color similar to the classic barn paint.
  5. Replies
    195
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    20,840

    For tall grass a roughing cut with a hedge...

    For tall grass a roughing cut with a hedge trimmer attached to the front of the mower makes serious doc a trivial issue. Rough full width and then do the finish pass with minimum overlap.
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    21
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    1,958

    My approach may be really dumb but when one gets...

    My approach may be really dumb but when one gets desperate... rough the slots with edm then clean up with slitting saw. Not very efficient but you've put a lot of time and money into this. I hope...
  7. Replies
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    28,019

    To the OP and really all of us. Please proofread...

    To the OP and really all of us. Please proofread your post. Being an old curmudgeon the first thing I did was check the driil size.
    27/64 is ALREADY ~.7mm oversize. Even 25/64 would have been...
  8. About us - Bernardo...

    About us - Bernardo
  9. Replies
    32
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    2,854

    Walking thru Boeing Surplus back when it was a...

    Walking thru Boeing Surplus back when it was a storefront there was a CMM base for sale. Maybe 4' x 4' x 1' but sitting on a pedestal of another piece of pink granite of similar size. Had some kind...
  10. Replies
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    1,638

    So 1.5 x 10 mm holes by the K. Ouch! Several...

    So 1.5 x 10 mm holes by the K. Ouch! Several things come to mind but then I'm still not thru my first cup of coffee.
    a. since chip evacuation seems to be the real problem not cooling(?) try high...
  11. I think 5axis has the right idea. Since Z is...

    I think 5axis has the right idea. Since Z is likely to be your stiffest axis. Plunge cut adjusting DOC and feed rate to max mrr.
    As a aside someplace on the web is a video of a vmc plunge cutting Ti...
  12. Replies
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    If the base material is plastic then full depth...

    If the base material is plastic then full depth thread might make sense. If the material is soft enough to form tap go that way but not deeper than a good safety factor. Maybe the maker of the dwg is...
  13. It is indeed frustrating waiting for data to...

    It is indeed frustrating waiting for data to transfer. On the 19.2 vs 9.6... Only if you are getting a lot of errors and having to retransmit will 9600 be faster. From the standpoint of simplicity...
  14. Reading about the PP problems makes me grateful I...

    Reading about the PP problems makes me grateful I went with a rotary. I did a 5 HP home built rotary but finally upgraded to a 30 HP commercial. Inrush currents are nasty. Unit is fused with 125 A...
  15. Poll: Being an old grump I'm not sold on wireless....

    Being an old grump I'm not sold on wireless. Mildly subject to interference, poor security. The security issue is going to be fixed soon with new version of the security protocol. I'm a great...
  16. Replies
    43
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    2,453

    Bridge mount the beastie. Pedestal under the...

    Bridge mount the beastie. Pedestal under the headstock and another pedestal, maybe 4" pipe under the tailstock. Of course both pedestals affixed to the floor. Expansion bolts, epoxy, what ever makes...
  17. Replies
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    14,692

    Google is your friend. Search for...

    Google is your friend. Search for Ziegler–Nichols. I basically use only the P part of it but that gets one started.
    My machine is very touchy about D and I get almost no benefit out of I. I have...
  18. Replies
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    1,944

    I don't know anything about your control but the...

    I don't know anything about your control but the G41 looks too simple.
    I'm used to something like

    G41G1XnnnYnnnnToolNumberFeedRate
    ....
    ....
    G40

    First try the code without cutter comp (...
  19. Replies
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    1,730

    Just to be different: how about automotive glass...

    Just to be different: how about automotive glass for the inside layer and polycarbonate for the outside. That should get you less fogging and good impact resistance. Indeed as with everything else...
  20. Pac-Nor has a barrel weight calculator on their...

    Pac-Nor has a barrel weight calculator on their site.
  21. Replies
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    IIRC ATF is a rather good penetrating oil. Google...

    IIRC ATF is a rather good penetrating oil. Google is your friend. It may have been a mixture of ATF and acetone. ;-)
    Maybe try a left hand drill bit.
    I desperation take it to a shop that does EDM...
  22. Try assra.com in the archives... half a doz or...

    Try assra.com in the archives... half a doz or so drawings of older guns; win single shot, etc.
    A lot of them were done for working with a set of castings so they are missing information useful...
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    You might try Mach and linuxcnc. Both are stepper...

    You might try Mach and linuxcnc. Both are stepper capable but linuxcnc also will drive servos. HTH
  24. OK, since I don't know your machine config I'm...

    OK, since I don't know your machine config I'm going to make some guesses. Homing usually works on a switch which gives you approximate position. Indicates you are within 1/2 pitch of the ballscrew...
  25. Replies
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    If you have the technical skills and time: which...

    If you have the technical skills and time: which make it more of a hobby than a $$ producing machine buy something with good iron and a dead control. Especially with used machinery: if you can't fix...
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