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  1. Joe, this is a reproduced operator's manual for...

    Joe, this is a reproduced operator's manual for 6-xx and 16-xx Barber-Colman gear hobbing machines.



    Z, I was just copying an example solution that happened to use that little critter. I wish...
  2. This is an attempt with the code that I have so...

    This is an attempt with the code that I have so far:

    https://pbase.com/d_a_v_i_d/image/170302433.jpg
    R 0.03801652892561983471074380165289

    V 0.85036356678147722923842326827401

    L...
  3. It turns out to be a rounding error. When taken...

    It turns out to be a rounding error. When taken to the extreme with lots of digits it looks like this:

    https://pbase.com/d_a_v_i_d/image/170300466.jpg

    a lot closer to the sample (but still not...
  4. Here are the pages: SUBTRACTIVE LEAD METHODS ...

    Here are the pages:

    SUBTRACTIVE LEAD METHODS

    method for hobbing spur gears

    https://pbase.com/d_a_v_i_d/image/170300279.jpg

    https://pbase.com/d_a_v_i_d/image/170300280.jpg
  5. Question about calculating change gears for prime tooth gears?

    This is the book sample:
    https://pbase.com/d_a_v_i_d/image/170299509.jpg

    This is what I am getting:
    https://pbase.com/d_a_v_i_d/image/170299510.jpg

    Does the book sample look wrong to you or...
  6. Replies
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    775

    Calculating CFM...

    Calculating CFM

    You probably would be better off to ask Ingersoll Rand.
  7. Is that a shadow? Cell phone held upside down so...

    Is that a shadow? Cell phone held upside down so that the flash is lower than the lens?
  8. Diamond like carbon (DLC) coating on the carbide...

    Diamond like carbon (DLC) coating on the carbide bending block? It's supposed to be slicker than Teflon. It's dry, so no cleanup. I'm not sure about its service life though.
  9. Replies
    14
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    1,117

    OT- Questions for Rat Builder 427

    Please ignore this if you think it will derail your thread.

    With your age, location and the handle you use:

    Did you ever meet LeeRoy Yarbrough? Peter Gregg? What about Conney the parts guy at...
  10. I don't know enough about them to know whether...

    I don't know enough about them to know whether this suggestion sucks or not, but rotary stages look interesting. There looks like some good deals to be had with careful shopping for used units....
  11. Replies
    36
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    2,767

    I would think about a gps tracking device that...

    I would think about a gps tracking device that recharges each time the welder gets plugged in. Hide it so that it is not obvious with the cover removed.

    It might be fun to have tracking software...
  12. Replies
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    2,137

    If he is trying to smooth out panning/tilting,...

    If he is trying to smooth out panning/tilting, have him get these: Stainless Steel Wheels for Alpha Wheels – CineMilled

    If the customer is looking for a cheap set of spares, have him buy a set of...
  13. Think about 2" x 4" x .12" rectangular,...

    Think about 2" x 4" x .12" rectangular, stainless-steel bars. 20' long supported not at the ends, but moved in to give a good balance between sag and yield avoidance. The image shown below would (I...
  14. This is a goofy thought: Rotate the part until...

    This is a goofy thought: Rotate the part until the hole is level side to side in a press (19.812 degrees). And with a hardened bar 1.260" diameter, press until it creates the fit you need. 1.260...
  15. Replies
    6
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    380

    The scroll is fitted too loosely in the chuck...

    The scroll is fitted too loosely in the chuck body. Tightening each of the three sockets pushes the scroll off center in a different direction. You will always have to use the same socket that was...
  16. Replies
    10
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    1,684

    Nice to hear from you, Mr. Addy. You...

    Nice to hear from you, Mr. Addy.

    You mentioning your experiences in the shipyard brings back great memories of mine at Savannah Machine and Foundry a smaller shipyard located in Georgia. The...
  17. https://www.practicalmachinist.com/vb/transformers...

    https://www.practicalmachinist.com/vb/transformers-phase-converters-and-vfd/
  18. 16d nails?

    16d nails?
  19. Replies
    8
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    978

    I just checked my link and it is not working for...

    I just checked my link and it is not working for me. It seems that MSC doesn't like how this website adds on affiliate information:

    ...
  20. Replies
    8
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    978

    Morse taper solid socket or Morse taper socket. ...

    Morse taper solid socket or Morse taper socket.

    https://www.mscdirect.com/browse/tn/Tool-Holding/Morse-Taper-Sleeves-Sockets/Morse-Taper-Sockets?navid=12108514#navid=12108514+4287945684
  21. Replies
    11
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    1,165

    If you have a clamp-on amp meter see if it is...

    If you have a clamp-on amp meter see if it is drawing too many amps in the trouble zone. It is probably a valve problem that is keeping the high pressure cylinder from doing its part of the work.
  22. Replies
    20
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    2,862

    Just to show that the C constant is exactly the...

    Just to show that the C constant is exactly the same for the Index and the Feed. Here goes:

    https://pbase.com/d_a_v_i_d/image/169808723.jpg


    The C constant is 10.7011494252873563218390804597...
  23. Replies
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    2,862

    Here's one where the C constant is 9.9453125 ...

    Here's one where the C constant is 9.9453125

    In fractional form it is: 9 9453125/10000000

    30 * 9.9453125 / (41 * 9.9453125) - 1 =

    30 * 99453125 / (41 * 99453125) - 10000000 =

    2983593750...
  24. Replies
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    2,862

    I know some people who cut helical gears (not...

    I know some people who cut helical gears (not talking about anyone on here) will scoff at the notion of having a C constant in any form other than a whole number.

    I want to prove that that concept...
  25. https://pbase.com/d_a_v_i_d/image/169777433.jpg ...

    https://pbase.com/d_a_v_i_d/image/169777433.jpg

    Dummy scaled smaller with a lower pre-load. Balanced mathematically.
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