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Type: Posts; User: sfriedberg

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  1. Replies
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    It has been more than 15 years, probably more...

    It has been more than 15 years, probably more than 20 years, since I last looked at datasheets for Ethernet isolation/coupling transformers. This was back when an Enet transceiver was a chip, rather...
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    412

    Actually, the cap-screw heads are for machine...

    Actually, the cap-screw heads are for machine screws which tighten split cotter clamps tangentially to the bushings, not set screws which bear directly and radially on the bushings.

    If you are not...
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    There are quite a few places which will cast...

    There are quite a few places which will cast urethane tires on metal parts. Also bumpers, recoil pads, contact surfaces, etc. For 100 parts, you might even learn how to do it in-house. Make sure...
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    I think Just a Sparky is on to something. The...

    I think Just a Sparky is on to something. The tool angles don't look at all good for rotating cutters (e.g., D-bits), and seem equally inappropriate (based on the photos) for grooving/boring bar...
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    149

    Please do. My old-style blue 10HP PP has a...

    Please do. My old-style blue 10HP PP has a decade of service on it, and I should probably be prepared to make the replacement.
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    When you are buying in boxcar quantities, and...

    When you are buying in boxcar quantities, and have both the cash and the willingness to set up and operate a more-or-less independent subsidiary company to act as your mini-foundry and extruder.
    ...
  7. Dunno. Van Norman used both on their milling...

    Dunno. Van Norman used both on their milling machines, post World War One. Generally the larger machines used the square ways, so you might conclude some benefit to production in larger sizes. ...
  8. Thanks, awander. Always something to learn.

    Thanks, awander. Always something to learn.
  9. I don't know where you can buy a set of brass...

    I don't know where you can buy a set of brass jaws. I was always told that brass was a pretty slippery material for vise or chuck jaws. Is there a special application for brass-jawed chucks?
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    Some dentists (not dental labs) now have handheld...

    Some dentists (not dental labs) now have handheld 3D scanner wands and minature 5D milling machines, together with special suites of the necessary software, to make inlays and crowns from unfused...
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    It's going to depend on the powder you choose,...

    It's going to depend on the powder you choose, but most of them are polyester and pigment. Since kids aren't dying from chewing on polyester fleece onesies, the bulk of the resin isn't a significant...
  12. There are a couple of possibilities, and we can...

    There are a couple of possibilities, and we can be more specific after you add some photos.

    If the long-nose collets have shallow recesses about 0.5" ID and tapering noses, they were probably used...
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    :eek::angry::(

    :eek::angry::(
  14. Mounting this on a drill would be silly if the...

    Mounting this on a drill would be silly if the threaded end is intended to open/close the jaws. If this is what we think it is, the body is what's mounted to the spindle, and the threaded end is...
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    OK, that's a valid point. You are correct that...

    OK, that's a valid point. You are correct that it won't air quench from a tempering temperature. And Rc40 is good enough to machine well.
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    Denis, I'm pretty confident this will not work on...

    Denis, I'm pretty confident this will not work on A2. Just letting a red-hot spot cool down naturually will air quench A2, and it will end up back at RC60+. O1 (or W1) behaves very differently from...
  17. If you push and pull on the threaded end, do the...

    If you push and pull on the threaded end, do the three things that look like chuck master jaws move out from and in to the center? The amount of motion would be small, like roughly 0.020". If so,...
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    There's no practical way to draw just the end of...

    There's no practical way to draw just the end of such a small A2 part to a significantly softer temper than the rest. I had a friend just go through that exercise with a knife blank. You can heat a...
  19. Romak, you are getting hung up on a non-issue. ...

    Romak, you are getting hung up on a non-issue. In a certain day and age, most part feeding was done by human hands. And if this is a model/demonstrator of a mechanism rather than a complete...
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    This was quick and very dirty. Sorry for not...

    This was quick and very dirty. Sorry for not having any proper projection in the last photo.

    Both of these factory stops are for the right side. I don't have (and intend to make) one for the...
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    A MT-to-MT sleeve isn't going to slip. You'd...

    A MT-to-MT sleeve isn't going to slip. You'd have to tear the tang off either the tool shank or the sleeve.
    If they are like mine, yes. You unscrew the shank from the internal ring gear/drive cup...
  22. Dope, try reducing your spindle RPM...

    Dope, try reducing your spindle RPM significantly. Those chips are dark blue and you might put less stress on things if you slow it down. If that helps improve the finish, try compensating for the...
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    I have only used the older Procunier heads and...

    I have only used the older Procunier heads and have been pleasantly surprised at how well the internal friction clutch cone holds up. I do not frequently use a head to tap larger than 3/8" and very...
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    Do you need to control just speed, or both speed...

    Do you need to control just speed, or both speed and phase? I.e., if one motor slips a little, is it sufficient to get it up to the target speed or does it also need to make back the angular slip?
  25. Could be a patent model rather than a salesman's...

    Could be a patent model rather than a salesman's sample.
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