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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Shock Absorbers
Tim Wescott wrote:
I asked this question once before moths ago, but didn't get the answer I wanted -- so now I'll try again and see if anything has changed. I have a scissor-action gate, a great big heavy thing. It's nicely counterbalanced with springs, but when it comes down it does so with a BANG! The shock is bad enough that the gate is currently in my shop getting all the broken bits welded so that it doesn't fall on a child or a UPS guy or something. I don't want to put it back into service without fixing the root cause. What I really need to fix this is one or more really heavy duty motion dampers. Ideally these things will have check valves that will let them move in one direction easily but not the other, and they'll damp in extension (although I can probably get around that problem). A really heavy duty screen door damper that worked in reverse (i.e. damps on the way out instead of the way in) would be absolutely perfect. Oh -- and it's gotta work outside in the rainy part of Oregon without rusting up. So: Anyone worked with something like this? Know anywhere to look (McMaster doesn't have what I need)? The current keywords that seem pertinent are "Hydraulic dampers", "gas springs", and "air springs", but the signal to noise ratio with those keywords isn't high, and I haven't figured out how to refine it yet. Make a damper. Use a hydraulic cylinder and a check valve with a drilled orifice in it. When the ram extends the fluid motion opens the check valve and the gate open easily. When the weight drops back some the valve closes and the pinhole bleeds the fluid off at a controlled rate. Gate comes down slowly. -- Steve W. |
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