[TheForge] Air hammer return stroke

Sat Feb 1 01:34:00 2003

On a self contained hammer should only top out during idle and air should
stop the rising cylinder starting the next hammer blow. You need either an
air cushion at the top of the cylinder or some spring just to keep the
cylinder from banging during idle.

Darrell

----- Original Message -----
From: "Steve Smith" <[email protected]>
To: "theforge" <[email protected]>
Sent: Friday, January 31, 2003 6:08 PM
Subject: [TheForge] Air hammer return stroke

> So I'm still working on a self contained air hammer, although my
> question applies to other hammers as well.
>
> When the ram is on the return, headed upward, it reaches a hard stop so
> that the air cylinder doesn't bung itself up. I'm trying to figure how
> to cushion the hard stop.
>
> A spring seems like a good idea. Unfortunately, there is quite a bit of
> energy to absorb. If I did it right, I could do it with a stack of
> Belleville spring discs. This would run about $50 buying them from MSC.
> I sized them based on stopping the hammer in less than 1" travel (which
> makes for a lot of spring washers). The rod on the cylinder that the
> discs would go around is 1 1/8" diameter. A large coil spring would also
> work, but I don't have a source for one.
>
> Any other suggestions out there?
>
> Thanks,
> Steve Smith
>
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