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Posted by Pete C. on April 12, 2008, 10:31 am
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Karl Townsend wrote:
>
> "The Kid" took a 2500 part job for my CHNC. We're one short on tooling spots
> in the turret.
>
> So, I'm designing a custom bar puller finger thing that will bolt on the
> cutoff tool holder. (You always pull right after cutoff - saves an index)
>
> The metal needs to spring so it slides on the bar and holds it. Not too
> rigid or it will just push the bar in the tight collet. Not too flexible or
> it won't hold after you release the collet.
>
> I realize this is mostly a design issue with how thick and long the fingers
> should be. We'll learn here by trial and error.
>
> What would be a good material choice?
>
> Karl
Don't design it to rely on springy material for the fingers. Use non
springy material for the fingers and use a normal compression spring in
a threaded hole backed by a nylon insert setscrew so you can adjust the
tension as needed, and change springs as needed.
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> "The Kid" took a 2500 part job for my CHNC. We're one short on tooling spots
> in the turret.
>
> So, I'm designing a custom bar puller finger thing that will bolt on the
> cutoff tool holder. (You always pull right after cutoff - saves an index)
>
> The metal needs to spring so it slides on the bar and holds it. Not too
> rigid or it will just push the bar in the tight collet. Not too flexible or
> it won't hold after you release the collet.
>
> I realize this is mostly a design issue with how thick and long the fingers
> should be. We'll learn here by trial and error.
>
> What would be a good material choice?
>
> Karl