ironsmith Posted August 18, 2013 Share Posted August 18, 2013 hey guys, I am building what i am calling a pnuematic treadle hammer, the plan is to use a 5 port 2 way foot operated valve with a 2.5 inch bore 10 inch throw hydraulic cylinder i have. my question is, how much weight can i use for the hammer head and still have it retract using 130 psi 60 gallon air compressor? I am planing on puting a flow control valve on the return side to compensate the speed of the retract. if you think the hydraulic cylinder is too inefficient can you recomend a pnuematic one ( I would like a 12 inch throw anyway) thanks for your help! Quote Link to comment Share on other sites More sharing options...
macbruce Posted August 18, 2013 Share Posted August 18, 2013 I would think a 2'' x 12'' would be better using up to 90 lbs for the ram without it getting sluggish, there's them that know better than me though........... B) Quote Link to comment Share on other sites More sharing options...
Backwoods Blacksmith Posted August 18, 2013 Share Posted August 18, 2013 I made the mistake of going with a 2 1/2 in cylinder. Uses way too much air. 70 to 80 lb tup with 80 to 90 psi. is recommended for a 2 in cylinder and your air will last longer. Quote Link to comment Share on other sites More sharing options...
lupiphile Posted August 18, 2013 Share Posted August 18, 2013 Hello, You might want to post the hp, or cfm ratings for your compressor so as to get more specific information. I have an early version of a phoenix hammer, replete with a 2.5" -12" stroke air cylinder, and if just used for single blows at about 115 psi, your average 5 hp compressor would do just fine. Oh I forgot to mention, it has a 180lb tup weight with my normal flat dies. Hope this helps some. Take care, Matt Quote Link to comment Share on other sites More sharing options...
ironsmith Posted August 18, 2013 Author Share Posted August 18, 2013 Thanks, for the replies! I have the typical 60 gal compressor sold at lowe's. i'll check the cfm today. but you guys pretty much pointed me in the right direction. now to try to embezzle the money from my wife for a cylinder. :) i just don't think the hydraulic cylinder will do what i want. thanks! Quote Link to comment Share on other sites More sharing options...
WRH51 Posted August 19, 2013 Share Posted August 19, 2013 Is the cylinder going to be pushing the ram up or pulling the ram up? You can calculate the lifting force of the cylinder from the area of the piston. If the cylinder is pulling the ram up, you subtract the area of the rod from the piston. What size rod? Is 2.5" the actual piston diameter and not the overall cylinder diameter? Quote Link to comment Share on other sites More sharing options...
ironsmith Posted September 21, 2013 Author Share Posted September 21, 2013 Bought a 2.5 inch cylinder with 24 inch throw for the air hammer, at 100 psi i can get 400lbs of pull! so i am good there, thanks for the suggestions and replies! Quote Link to comment Share on other sites More sharing options...
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