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Watchmakers Lathe Bow Type Turning Arbours

luiazazrambo
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nickelsilver Distinguished Member

nickelsilver

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These are used when turning hollow parts between centers. Something like an hour wheel, you slide it onto an arbor that fits well, hook your bow around the pulley, put it between centers and now you can work on it. They are the brothers to drive dogs, which clamp onto the diameter of a part for dead center turning. Very old drive dogs are actually small pulleys too, for direct bow drive, but most you see are turned by a finger from a pulley on the turns which is either driven by bow, a hand wheel, or a motor.

 

In the pic you can see a set of drive dogs that are fixed by a screw, a couple of the old drive pulleys, and a set of "fish" that are sprung open with the tool, the part inserted, then released to clamp- along with a set of arbors.

drive dogs.jpg

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      Steel has some funny properties, or at least counterintuitive. The modulus of elasticity is effectively (not exactly, but close enough) the same for steel that is annealed and hardened. What changes is the point of plastic deformation* . If the movement of your spring doesn't pass that, it should work fine. It looks a little thick, I would thin it a bit maybe from the main body out about halfway, maybe 10-20% thinner (not in thickness, along its form). But if it works it works!   *So- if you have two bars of the same steel, one annealed, one at 600 Vickers (general hardness watch arbors might be), clamp them to a table so the same length is hanging out, and put a weight on the ends, they will bend the same amount. But if you continue to add weight, then remove it, at a point the annealed bar won't return to its original straightness. That's the point of plastic deformation. But up to that point, as springs, they are the same. However- their wear characteristics will be very very different. And getting the hardened bar past its point of plastic deformation takes a lot more effort.
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