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Type: Posts; User: David_M

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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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    "How did they do that back before the days of CNC...

    "How did they do that back before the days of CNC dressers?"
    "A dresser built something like a miniature Excello thread miller?"

    I can't say with certainty. I know Mr. Goldstein would know, but...
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    Marcus, Actually the form created by dressing...

    Marcus,

    Actually the form created by dressing is the same form as on a hob (rack profile). And the gears are created using a generative process just like hobbing. It's a really neat way to quickly...
  11. Hey, Zahnrad. With a few different length...

    Hey, Zahnrad.

    With a few different length socket cap screws and a couple of jaw designs...

    For inside clamping, the screws could push out if the jaws were counter bored from the inside (there...
  12. These are probably 2 to 4 times too large (10...

    These are probably 2 to 4 times too large (10 pounds). Also are in India.

    Welcome to Bonet Chuck
  13. Please look EG

    I made a different version of the software for change gears to hob helical gears. This one is 32 bit instead of 64 bit and it is compiled to work on computers as for back as windows xp in deference...
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    Bal-tec...

    Bal-tec

    Stainless Steel 1/2". Less than $19.51 for 4 or more.
  15. That's a yellow dial to signify it's metric.

    That's a yellow dial to signify it's metric.
  16. Here is an old post about bending 8020: Can...

    Here is an old post about bending 8020:

    Can you radius bend 8020 Aluminum Extrusion?

    I did see this after posting:

    Find Curved | Aluminum Extrusions products and many other industrial...
  17. Exactly right. I should have used "generated"....

    Exactly right. I should have used "generated". Thanks, Dan!

    --david
  18. Very nicely explained! I have new respect for...

    Very nicely explained! I have new respect for profile shifting when done correctly. Before, I thought of it as a kludge.
  19. Follow-up questions on gear teeth profile shifting

    Sequence 01 on Vimeo


    Does the pitch diameter remain the same between a profile-shifted and a non-profile-shifted gear?

    The video has two gears: one is a 52-tooth gear "cut" on a 56-tooth-gear...
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    Emanuel, on further thought, I'm wrong. Now I can...

    Emanuel, on further thought, I'm wrong. Now I can visualize how it works or at least I think I can.:):confused::o


    Gear meshing


    Involute gears have the invaluable ability of providing...
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    Or... you could keep the 1.25 mod and add a small...

    Or... you could keep the 1.25 mod and add a small amount of helix to the teeth to get the 66.625 center distance. With profile shifting, the gear's constant velocity is lost, though probably won't be...
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    Very nice, Jacobolus. --david

    Very nice, Jacobolus.

    --david
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    A granite block/slab would make an ideal...

    A granite block/slab would make an ideal foundation for a lathe.

    It would need to be thick enough to twist the bed straight and not crack over time. If it would make the lathe too high, cut a hole...
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    Ask Norm ...

    Ask Norm



    https://www.youtube.com/watch?v=fnX-EPaAIdU
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    Just adding to his selection, not trying to...

    Just adding to his selection, not trying to one-up Vascomax. I love the maraging steels (for the reason you mentioned).

    I, also, saw Hy Tuff in those charts. Was it Henry's or Summers Brother's...
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