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Type: Posts; User: Joe Gwinn

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  1. Driving a 1/8" drill 2.3" deep will cause chip...

    Driving a 1/8" drill 2.3" deep will cause chip packing for sure:

    "Softer materials are best drilled with a deep hole parabolic (narrow lands, wide flutes for extra chip space) design. These drills...
  2. Actually, it is not castor oil that's poisonous. ...

    Actually, it is not castor oil that's poisonous. It's sold in the drugstore as a laxative for babies.

    CVS Health Castor Oil (with Photos, Prices & Reviews) - CVS Pharmacy
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    This appears to be stainless steel rubbing on...

    This appears to be stainless steel rubbing on stainless steel - sure to gall. There needs to be some bronze in there, so SS does not ride on SS.
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    Rabbit-skin and fish-skin glues

    It just came to me. The traditional solution is rabbit-skin glue:

    Rabbit-skin glue - Wikipedia

    Also, there is fish-skin glue, which isn't as strong but is easier to release:

    High Tack Fish...
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    That's it exactly.

    That's it exactly.
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    I do this a lot, using a Dorian holder that...

    I do this a lot, using a Dorian holder that allows the insert blade to be installed upside down, and the lathe running in reverse. It works very well, but does require flood cooling - brush-on just...
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    And not exactly perpendicular to the spindle...

    And not exactly perpendicular to the spindle axis. This matters a lot with a solid steel cutoff blade like the original Aloris BXA7. The newer units may come with a carbide insert into a narrower...
  8. It's connected and/or configured incorrectly, but...

    It's connected and/or configured incorrectly, but we cannot tell anything more from the description given. You will need to read the user's manual for the VFD.
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    The reason to mention this kind of bolt was to...

    The reason to mention this kind of bolt was to show the limiting case in practice. It's pretty heroic. We did have the snap-off tang variety, but as you say the correlation to clamping force is...
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    Typically, the two half-bars would be bolted...

    Typically, the two half-bars would be bolted together in some optimum manner, so the two half-bars would not be independent, they would be sharing load. The key question is how well that works in...
  11. Yes. But especially young mice can lick the...

    Yes. But especially young mice can lick the peanut butter off the trigger without setting the trap off. I find it useful to adjust the trigger sensitivity by bending the "flag" that catches the...
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    No, stiffness varies as the cube, not the square,...

    No, stiffness varies as the cube, not the square, of the cross-section width in the relevant dimension. Look at Roark's formulas for stress and strain for the actual formulas. There must be a...
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    Well, I'll probably hit the books this weekend. ...

    Well, I'll probably hit the books this weekend. My instinct is that it's difficult to get that kind of stiffness out of ordinary bolts, no matter what. In the old days, they used hot rivets, which...
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    Hmm. How does one achieve that 80%? Especially...

    Hmm. How does one achieve that 80%? Especially in twisting.
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    It's straight out of Roark, formulas for stress...

    It's straight out of Roark, formulas for stress and strain. PDFs are available on the web. Basically, the stiffness of a beam is proportional to the cube of the dimension being bent: (1/2)^3= 1/8....
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    There are, but what they do is to shine an...

    There are, but what they do is to shine an infrared light into one end al see how much makes it to the far end.

    What do you mean by "function"? What does this fiber optic cable do?
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    Is that bar a solid square cross-section, or is...

    Is that bar a solid square cross-section, or is it two rectangles bolted together? It looks like two rectangles.

    The reason to ask is that two rectangles bolted together have 1/8 the bending...
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    I looked the MSDS up. It's basically lanolin in...

    I looked the MSDS up. It's basically lanolin in kerosene, or maybe something slightly lighter. Lanolin is the traditional rust inhibitor used in marine applications of multi-stranded galvanized...
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    On laptops and desktops, a common variant is...

    On laptops and desktops, a common variant is where one is trapped by a webpage, which demands that you click something. As one might surmise, it's a really bad idea to click that, or anything else...
  20. Thread: UNS threads

    by Joe Gwinn
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    Yeah. But they were called lantern toolposts...

    Yeah. But they were called lantern toolposts back in the day, because they resembled a kind of kerosene lantern widely used in the day, on horse-drawn carriages I think. This is before the rocker...
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    For parting off, one can use a squeeze bottle...

    For parting off, one can use a squeeze bottle that can squirt oil into the depths. But this occupies a hand that may be needed elsewhere.

    But I use soluble oil (WS-5050) flood/drip coolant a lot,...
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    Run the used oil through a regular oil filter...

    Run the used oil through a regular oil filter intended for a large truck.
  23. Thread: UNS threads

    by Joe Gwinn
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    Thanks. I have been having that problem to. I...

    Thanks. I have been having that problem to. I have found some partial European standards, and I have to believe that there are US ones as well. But don't have a document name or number.

    Hmm. ...
  24. Thread: UNS threads

    by Joe Gwinn
    Replies
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    2,143

    Lantern-post dimensions sought

    Limy, does that 1937 issue contain anything on the dimensions of lantern-style tool posts? I'm interested in the radii of the various dished washers and rockers that rest on those washers.

    I...
  25. For the proper dimensions for an O-ring groove,...

    For the proper dimensions for an O-ring groove, it's best to consult the Parker O-Ring Handbook. This is the Bible.

    https://www.parker.com/Literature/O-Ring%20Division%20Literature/ORD%205700.pdf
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