247 reputation
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visits member for 1 year, 9 months
seen Apr 9 at 6:47

Apr
9
answered Why Do Hurricane Balls Spin So Fast?
Nov
30
asked Why put something in the middle of the pan would prevent soup coming out during cooking?
Nov
6
comment How to check a worm and a worm gear fit?
No. Just one worm and one worm gear. How can I check that they can work together?
Nov
6
asked How to check a worm and a worm gear fit?
Nov
1
accepted Where I can find a torsional stiffness table for different types of stainless steels?
Nov
1
asked Where I can find a torsional stiffness table for different types of stainless steels?
Oct
3
comment How DC and AC relays works?
coil base mechanical type relay
Oct
3
asked How DC and AC relays works?
Sep
20
revised May I know how a vortex tube works?
added 110 characters in body
Sep
20
revised May I know how a vortex tube works?
added 7 characters in body
Sep
20
asked May I know how a vortex tube works?
Aug
8
comment Is squared motor gearbox ratio proportional to inertia ratio?
thanks so much for your help
Aug
8
accepted Is squared motor gearbox ratio proportional to inertia ratio?
Aug
8
comment Is squared motor gearbox ratio proportional to inertia ratio?
@WetSavannaAnimalakaRodVance Would you please put your comment into the answer section? I will accept that as the answer. Actually, it is a good and clear answer.
Aug
8
comment Is squared motor gearbox ratio proportional to inertia ratio?
Any equation to support??
Aug
8
asked Is squared motor gearbox ratio proportional to inertia ratio?
Jul
9
awarded  Yearling
May
31
comment What is the difference between material fatigue test with 1 sec cycle and 1 hour cycle?
That is NOT my point. I want to tell you that material can be broken under the ideal ultimate stress strength, maybe within elastic range. Have you seen that S-N figure at 1E+3 cycle? The breaking stress from 350MPa to 200MPa.
May
30
comment What is the difference between material fatigue test with 1 sec cycle and 1 hour cycle?
Please read the S-N curve of en.wikipedia.org/wiki/Fatigue_(material) . It only needs 25% or less of the ultimate stress of the aluminium to break that aluminium IF the test is using that stress for running 1E+7 cycles.
May
29
comment What is the difference between material fatigue test with 1 sec cycle and 1 hour cycle?
" For a metal piece tested under room conditions, the stress must exceed the elastic limit to cause any damage to the sample." I don't think this is right.