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Type: Posts; User: David_M

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    And is is possible to have nitrided maraging...

    And is is possible to have nitrided maraging steel without affecting the age harding of the maraging steel:

    https://iopscience.iop.org/article/10.1088/1742-6596/100/6/062013/pdf

    This combines...
  2. That is Rockwell E hardness. You are thinking in...

    That is Rockwell E hardness. You are thinking in terms of the Rockwell C scale.
  3. It would be interesting to hear if thin blades...

    It would be interesting to hear if thin blades coated with BAM or diamond-like carbon could overcome that 'gripping'.

    Material slicker than Teflon discovered by accident | New Scientist

    BAM and...
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    PM Sent...

    PM Sent...
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    Thanks Dan. I'll PM you, shortly. Best...

    Thanks Dan. I'll PM you, shortly.

    Best regards,

    david
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    Even if I allowed + or - 1 on the last digit? ;)...

    Even if I allowed + or - 1 on the last digit? ;)



    Whoever wants to do it can ignore the excessiveness and make it using their normal shop practices. I'm easy to please and I pay in american.
    ...
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    transverse pitch diameter. oops. I updated...

    transverse pitch diameter. oops.

    I updated those photos after John pointed out my mistake in nomenclature.
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    Could I get two gears cut by a forum member?

    I would like to purchase two helical gears from a forum member. These need to be hobbed on a gear hobber that uses manual change gears.

    Below shows the specifications. I am interested in having...
  9. Thread: Testing

    by David_M
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    https://pbase.com/d_a_v_i_d/image/129430118.jpg

    https://pbase.com/d_a_v_i_d/image/129430118.jpg
  10. I have the same with 56,000 miles. It has been...

    I have the same with 56,000 miles. It has been trouble free.
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    Finegrain is right. Look up *Higbee thread...

    Finegrain is right.

    Look up *Higbee thread start* on here and look at this: YouTube

    These videos show how to get started at least. Pick the ones that say Higbee or blunt start threads. This...
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    You can change one digit for the bearing:...

    You can change one digit for the bearing: 63032RSJ instead of 62032RSJ. That is a heavier series bearing with the same bore. It has a 47mm od vs 40mm and is 2mm wider.
  13. High-strength magnesium-lithium alloy weighs half...

    High-strength magnesium-lithium alloy weighs half as much as aluminum
    January 01, 2016
    Source: ASM International
    The University of New South Wales and Monash University, Australia, announce that...
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    What about the side-pipe market? 262352 ...

    What about the side-pipe market?



    262352

    https://pbase.com/d_a_v_i_d/image/169581066
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    Let this girl show how to do it: YouTube...

    Let this girl show how to do it: YouTube Watch at: 2:30-2:35.
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    262129I'm just kidding.

    262129I'm just kidding.
  17. I've added a 'print' function. It will print to...

    I've added a 'print' function. It will print to your printer or print to an editable .pdf file.

    Shown below is a sample of the printout:

    HELICAL GEAR WITH DIFFERENTIAL LOCKED-OUT OR NOT PRESENT...
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    Moonlight, you have lived an interesting life. ...

    Moonlight, you have lived an interesting life.

    Here is a tribute to Mr. Herd (a standout in engineering and physics at Oxford U.) :

    Remembering March co-founder Robin Herd - 1939-2019
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    This is only a thought: A hammer drill plus this...

    This is only a thought: A hammer drill plus this stuff:

    ECOBUST 11 lb. Concrete Cutting and Rock Breaking Non-Combustive Demolition Agent Type 3 (41F - 59F)-EB311 - The Home Depot
    ...
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    I agree with Marcus, it is much appreciated! ...

    I agree with Marcus, it is much appreciated!

    Best regards,

    David
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    This is "cutting" a 12t, 20dp, 20pa with a...

    This is "cutting" a 12t, 20dp, 20pa with a flat-sided cutter:

    Sequence 01_1 on Vimeo
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    Stupid me. That rack is a pretty large diameter....

    Stupid me. That rack is a pretty large diameter. :D


    11_tooth.png photo - David photos at pbase.com
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    Yes, the involute base circle mathematically. ...

    Yes, the involute base circle mathematically.

    You are really making me think when you mentioned undercutting by the hobb. I guess that larger diameter hobbs undercut less?
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    I mentioned using a wire and a fourth axis (this...

    I mentioned using a wire and a fourth axis (this applies to a straight sided end mill too) :

    This has the timing setup to cut a gear space that is the same width as the "wire" (drawn as 0.01")...
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    I decided to delete what I wrote until I have...

    I decided to delete what I wrote until I have more time to think about it...
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