June 5, 201213 yr I have been building a kinyon type powered hammer and think i got it almost all done but when i turn hit the foot pedal and it starts goin it will quickly go up too high and lock out at max height. if i resist the exhaust on the top piston i can get it to not do this but then it runs slow. just with this info can anyone help? it seems like it goes past the point of the switch to fast and it doesnt switch it over to bring the hammer down. (this isnt a direct drive hammer,it has the leaf spring that is used to lift the hammer,could the flex in the leaf spring be causing the switch to quick switch and skip the downward cycle) I can provide more info tomarrow after more testing.
June 5, 201213 yr I have a kinyon, but it's a bit different than yours. (Old style with the cylinder attached directly to the head. Mine has stuck in the up position once or twice, and what causes it on mine is that the roller valve that reverses the flow of air through the main valve, does not get compressed enough to switch the flow. On my hammer, I just have to loosen the screws that hold the roller valve in place, and scoot it over a bit. I'm not sure if your style even uses a roller valve, but if it does, make sure it is being compressed all the way.
June 5, 201213 yr Are your valves on the ram, or the cylinder connection? If they are on the ram, and you have a spring, then the ram and cylinder do not share a direct position/velocity relationship because of the spring. Pictures may help people who are experienced with these hammers help more. Phil
June 5, 201213 yr I had a very similar problem with mine. I found that I was not getting enough oil to the shuttle valve and it was hanging up in the open position. I also had to put at restricter on the rod end exaust. This did slow it down. The eneritia on the up stroke would over travel the limit switch and bottom out. Then you have to ballance out the up and down stroke to hit hard and not over travel. I took the shuttle valve apart and greased the o rings ensureing lubrication. Do not use grease on the UMHW as it will slow down the action. If you must use lube, use a real light oil, spareinly. How much clearence is there in the shaft and UMHW? This cannot be too tight. The shaft carrier should slide easily with little resistence. I have no restriction at the main exaust port only at the cylinder. If you want to discuss this more? [email protected]
June 5, 201213 yr Author ok thanks for the responses i am gonna try some stuff today and if it works i will say what happened but if its still not working at max ability then i will post pics and a list of what i have.
June 6, 201213 yr Author ok i figured out my problem,i have too much slop in the spring so as the hammer starts traveling up it wil reverse down but with no resistance it reverses again back upwards and since the hammer is still moving up then it goes beyond the sensor range and cant switch again to go down. I am gonna modify the spring attachment to just like a leaf spring is attached to a car,solid on one side and then on a pivot for forward and backward movement. wow so simple and i didnt figure it out.
June 6, 201213 yr Congrats! LOL That's the way most problems are! The answer seems so obvious once you figure it out! I see you are pretty new to the forum though. The rules around here say that if you mention any type of tool you have to post pictures of it! We are picture addicts around here. :DWELCOME TO IFI! :D
June 7, 201213 yr Author Ok i have removed almost all the slop and it still stutter at the switching point. i am thinking it might be because i have a magnetic switch which works too fast,thinkin about buying a new valve and a mechanical switch.http://www.facebook....=timelineSingle
June 8, 201213 yr Well, from what I see... A limit switch should be a limit switch... I mean that even if there's a bit of over-travel on the up stroke the switch should remain switched until the movement is reversed and the tup back in its given stroke range... Not sure if I'm clear... I assume your magnetic switch is on the cylinder actuated by a magnetic piston ? If so, yes, you should try mechanical switching, in a way that would keep being switched even in case of upward over travel...
June 8, 201213 yr Author yeah i ordered a new 1/2" valve and a mechanical switch today so I will be ordering another 14inch stroke piston to make a basic kinyon type hammer for sale since i have all the parts but the piston itself.
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