I've watched two videos that show shooters inserting the "match" into the serpentine. In both the serpentines are split with a thumbscrew to tighten up the two halves on the match/cord and the shooters appear to turn the thumbscrews counter-clockwise to tighten, meaning the screw would be threaded LH. Is there a reason the screw(s) would be LH threads? I think the screw is a nice touch and would like to include one in my lock.
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LH threads?I'v
- Thread starter tom in nc
- Start date
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Ahhhh, a typical machinist's dilemma with threads ... what am I trying to do and in which way do I want the force or movable piece to move?
I'd agree - purely for ergonomics - that it makes the most sense to turn the jaw screw clockwise to tighten and opposite to loosen.
That said, it really depends on which of the 2 halves is threaded, and then whether it be of a RH or LH thread. When you think about a typical machinists or bench vice, turning the handle clockwise tightens the vice, moving the movable (front) jaw against the fixed (back) jaw. This is down by a LH thread, fixed or captured (pin locks into a groove on the threaded shaft) at the far end.
A simple method for serpentine jaw screws is to use a typical RH threaded thumb screw and have the tapped hole on the jaw closest to the barrel (RH'd arm, says the lefty ... ). Turning the jaw screw clockwise pulls the outside jaw in towards the other jaw, bringing them together. All this means is that the threaded end will stick further and further out the inside jaw as one tightens the jaws.
Pictorially it looks/works like this:
I'd agree - purely for ergonomics - that it makes the most sense to turn the jaw screw clockwise to tighten and opposite to loosen.
That said, it really depends on which of the 2 halves is threaded, and then whether it be of a RH or LH thread. When you think about a typical machinists or bench vice, turning the handle clockwise tightens the vice, moving the movable (front) jaw against the fixed (back) jaw. This is down by a LH thread, fixed or captured (pin locks into a groove on the threaded shaft) at the far end.
A simple method for serpentine jaw screws is to use a typical RH threaded thumb screw and have the tapped hole on the jaw closest to the barrel (RH'd arm, says the lefty ... ). Turning the jaw screw clockwise pulls the outside jaw in towards the other jaw, bringing them together. All this means is that the threaded end will stick further and further out the inside jaw as one tightens the jaws.
Pictorially it looks/works like this:
Aha! So if both " jaws" of the serpentine are threaded,in order for a single screw to bring them together, or apart, one would have to have RH threads, and the other LH threads, with both threads on the screw. Like a turnbuckle. I hadn't thought of that. Duh. Here's my sign.
