480volt

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About 480volt

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    San Francisco Bay Area

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  1. larger tubular rivets?

    The challenge with brass rivets is trying to make a nice shop formed head. Copper can be domed pretty easily, but brass doesn’t move around nearly as easy.
  2. Leather burnisher, blueprints anyone?

    It’s very bad ju-ju to try and regulate the speed of an AC induction motor by varying the voltage, regardless of the means. The speed of the motor is determine by the number of poles and the frequency of the source, hence the need to regulate speed by changing the frequency. You lower the voltage, the motor will still try to run at it’s rated speed and it will begin to draw more current. Torque will drop off as well. AC motors not rated for variable speed (inverter duty) will also not cool themselves properly if run at less than design speed. I’m not saying that there aren’t AC motors with enough margin designed into the windings that they can tolerate what is essentially a continuous overload situation, but I am surprised that someone identifying as an electrical engineer would suggest it. And good luck trying to explain it to your insurance adjuster. Some home shop machinist types have adapted DC motors and controllers from treadmills, these motors are designed to operate under load at a wide range of speeds and can sometimes be had for the effort of hauling it away.
  3. Hand skiving help

    Bruce Johnson has a Rose, a Gomph, a couple Osborne Newarks and an unmarked on his site, currently. Always been happy dealing with him
  4. This site works well because members generally do not bring politics into the discussion. The OP was simply about cost impacts on sewing machines due to the ongoing tariff situation in the US. If people want to talk politics or state opinion as facts, than they should start another thread.
  5. Big red sharpening jig

    You should ask him, not all of his inventory is on the site.
  6. Big red sharpening jig

    Bruce Johnson had one listed for sale on his site for months, you should check with him.
  7. First Stitching Irons Advice

    I own a set of the Osborne irons and find that the teeth are a bit too wide and the angle not accute enough (not parallel enough to the stitch line). The geometry of the teeth on Blanchard irons is much better. I can’t speak to Wuta, Crimson, or KS Blade, as I try to keep my purchasing to old line companies that I hope will stay in business. I imagine VB will eventually succumb to the downwards pressure from the Korean and Chinese competitors much like Dixon did.
  8. World war II and later canteen snaps

    Search lift-the-dot snaps. Looks like there are many suppliers for these.
  9. Something to Sing(er) about! :)

    Threaded rod bends easy and is cheap. It’s like grade nothing on the SAE chart, but will be plenty strong for what you are doing.
  10. The planets are in alignment

    How about a little Loctite red on the bearing when you assemble it to encourage it to stay put?
  11. 29k58 or 71 - which one to buy?

    In my neck of the woods (SF Bay Area) those would be extremely reasonable prices. I wouldn’t haggle, I’d buy both and keep whichever one performed better.
  12. Fortuna leather splitting machine

    Discussions about power requirements are speculation without seeing the rating plate on the machine or on the motor.
  13. Screws for Blanchard Paris Gauge

    The threads on the screw in the photo don’t look damaged, are you replacing it for cosmetic reasons? If you want an exact replacement, you may have to get one from a donor tool. If you just want a functional replacement, than what baroness said, the hardware store is your friend. If it is 1/4” diameter, it may be 1/4-20, which is common as dirt, or 1/4-28, which is not. Blanchard may also have made proprietary thread forms like Singer frequently did. The comical point implies that this is a set screw. If so, you should replace it with a set screw with a similar point to avoid damage to the surface it bears against. Set screws are also typically hardened. If it is just a cosmetic issue, could you just dress the heads with a file?
  14. One Maul to Rule Them All

    Everything I have ever made has at least one flaw in it, none of them deliberate...