[TheForge] Air Hammer Guides

Sun Apr 28 10:14:01 2002

 I think 12" would be enough, I cant recall all my dimensions but mines
about 60% in 40% out at the bottom of stroke. Mine does move a little if Im
hitting in a way to put side loading on the dies, but its no problem at all.
There were some photos of my setup on the old photo site but thats gone now.
 Ralph I put a slot in my guide and have a 2" ramp sticking through the
slot, my roller switches are on a slider I cobbled together from an old
printer, they have a spring tensioner to keep them where I put them. One
problem here is the switching time for a double pilot valve can be too
short, "stalling" the hammer by not giving enough of a pulse to switch the
valve when you are going full speed with the 2 rollers close together. Ive
nearly eliminated this by having minimum tubing from the rollers to the
valve and using small tubing which helps keep the signal quick. Also pay
attention to how you attach the ramp to the ram if you do it the same way I
did, Ive had a few problems with this breaking welds and loosening loctited
bolts.

----- Original Message -----
From: "John Newman" <[email protected]>
To: "the forge" <[email protected]>
Sent: Sunday, April 28, 2002 2:34 PM
Subject: [TheForge] Air Hammer Guides

> I have finally started welding up my air hammer frame.  I just thought I
> would get opinions on dimensions of my guides before welding that tube
> to the rest of the frame.  Ralph Sproul and Shannell's  UHMW guides
> seemed like a good idea so that is what I am building.  I have a 6"x1/4"
> square tube that I have drilled and tapped to hold 18" of 1/2" UHMW.  I
> am putting a 20"x 4.5" square tube inside.  The distance from the top of
> the bottom die to the bottom of the guide tube will be 10", with a 2"
> thick die this will leave 12" of bearing are at full extension, is this
> enough? is the extension too much?  I am using a 12" cylinder to start
> with, because I have one, but I am going to make sure it can be easily
> changed  to a longer stroke.
> I'm putting a hydraulic press on the back side of the hammer (another
> idea taken from Ralph) I am thinking of using the same sort of guides
> for the press.  Will they work? or are they even neccesary, would two
> nesting tubes be enough?
>
> John Newman
>
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