Torsion Spring Life Cycle Test Machine - Need some advice
Torsion Spring Life Cycle Test Machine - Need some advice
(OP)
Hello all. I need to design a quick and Simple torsion spring tester.
About the spring to be tested:
-Deflection angle required = 105°
-Anticipated Torque required to rotate to 105° = 70 in-lbs
-Number of cycles needed = 100k
My idea (by no means am I thinking this is the best way, but probably the easiest):
I have access to a pneumatic ROTARY ACTUATOR that I can control the angle of deflection to meet what I need and it has more than enough torque (actually overkill) but I have no experience in automating the rotation cycles. There are limit switches that could be purchased for the actuator.
Anyone have any ideas? If I could just supply air to the one side for 1 second, release, then supply air to the other port for 1 second and release - then repeat this cycle...
About the spring to be tested:
-Deflection angle required = 105°
-Anticipated Torque required to rotate to 105° = 70 in-lbs
-Number of cycles needed = 100k
My idea (by no means am I thinking this is the best way, but probably the easiest):
I have access to a pneumatic ROTARY ACTUATOR that I can control the angle of deflection to meet what I need and it has more than enough torque (actually overkill) but I have no experience in automating the rotation cycles. There are limit switches that could be purchased for the actuator.
Anyone have any ideas? If I could just supply air to the one side for 1 second, release, then supply air to the other port for 1 second and release - then repeat this cycle...





RE: Torsion Spring Life Cycle Test Machine - Need some advice
RE: Torsion Spring Life Cycle Test Machine - Need some advice
RE: Torsion Spring Life Cycle Test Machine - Need some advice
-handleman, CSWP (The new, easy test)
RE: Torsion Spring Life Cycle Test Machine - Need some advice
I did a similar setup to life cycle test some compression springs that were compressed with a linkage setup. The end results were very accurate vs. claims from the field. Actually ended up going from 200,000 cycle life (someone really screwed the pooch on the spring design on this one), to 7,000,000+ and still going with a simple logical fix.
Just an FYI, my test I ran at 450 RPM (was way over actual cycle time, but was within reason and didn't create any wierd effects on the spring during testing. At 450 RPM it still took ~8hrs to get 200,000 cycles. So you'll be in for a long test I'm sure. Even with that I checked it every 45-60 minutes so my % error was relatively low in the general scheme of things.
Have fun!
James Spisich
Design Engineer, CSWP
RE: Torsion Spring Life Cycle Test Machine - Need some advice
Steve
RE: Torsion Spring Life Cycle Test Machine - Need some advice
KENAT, probably the least qualified checker you'll ever meet...
RE: Torsion Spring Life Cycle Test Machine - Need some advice
RE: Torsion Spring Life Cycle Test Machine - Need some advice
Also, don't forget to include a cycle counter somewhere.
ISZ
RE: Torsion Spring Life Cycle Test Machine - Need some advice
RE: Torsion Spring Life Cycle Test Machine - Need some advice
RE: Torsion Spring Life Cycle Test Machine - Need some advice