Help With Hydraulic brake

by Stan Martin
(Elsmere, Ky)

I developed a clamp system using an Ambush bushing. Ambush makes a split bushing that, when hydraulic pressure is applied, clamps around a shaft acting as a brake. I put these on a shaft and am trying to use a air over hydraulic cylinder to do the clamping. In the past I used a air over hydraulic pump connected directly to the clamp and it worked great. Most of the applications for this clamp system do not have hydraulics available so I thought I could simply run and airline to a air over hydraulic cylinder, run the hydraulic to the clamp from the opposite end of the cylinder and it would work the same. I'm not using any control valves just line in and line out.

125 psi In
I'm getting no movement from the cylinder and no oil pressure coming out the hydraulic end.

What am I doing wrong?

Thanks,

Stan Martin
MMS
859-727-9900

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Bill says....

Stan, happy to post your question, though I am not into hydraulics per se, and don't pretend to know enough to advise you. I also do want to point out that there are many companies out there that manufacture compressed air driven brakes for applications like yours, and I'm wondering why you are reinventing the wheel, so to speak?

Cheers,

Bill