ciladog Posted March 16, 2010 Share Posted March 16, 2010 I recently completed building and new forging hammer. It’s in the style of the Bull but with many modifications in the controls that allow for on the fly changing of the length of stroke, intensity of the strike, position of the stroke, and it will even run without touching the treadle at any given stroke. But this post is about increased controllability for all pneumatic hammers (not self contained). I have a pressure gauge on the supply line just before the hammer and I noticed that each time the tup changed direction; there was a pressure spike of about 10-15% PSI. This happens because at the very instant that the tup changes direction (when the spool in the control valve changes position), the pneumatic cylinder becomes a pump while the inertia of the present tup direction is overcome. The intensity of the spike varies since air can be compressed and it is unpredictable. I installed a directional air control valve (inline spring type control valve) just ahead of the spool valve as an experiment and although the effect was subtle it was noticeable. The control became more exact. I got the valve from McMaster-Carr for under $14.00. You may want to see if adding a check valve adds to your hammer’s control. Place it as close to the spool valve as possible. I know you’ve seen a pic of the paperclip before on the Phoenix hammer website but I just had to try it so I post if for your amusement. I also posted a pic of my hammer, it's control box, and one of the original Bull control box. Thank you Tom Troszak for designing the Bull. It is the best hammer pound for pound. Quote Link to comment Share on other sites More sharing options...
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