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  1. beatcan

    ACME screw actuator failure analysis

    I used 1/2 the tension load for the max shear theory (1/2 of 12210psi), combined with the 338 psi with a stress concentration factor of 10 (so 3387psi) because the diameter to diameter ratio of the hole to screw diameter was off the stress concentration chart. I also used a shafting constant Cm...
  2. beatcan

    ACME screw actuator failure analysis

    We have a linear actuator manufactured in China. We recently have been getting many failures at a stress concentration area of the screw. The basic design is a 0.75" ACME screw. Threads machined off to a diameter of 12mm (.472") where a 5mm (.197") hole is drilled. A pin...
  3. beatcan

    How can I tell a good motor from a bad motor

    (I already posted this in the pumps forum instead of electric motors by accident. Sorry if you get this thread twice). Our company is sourcing motors from China for exhaust fans. These are PSC motors, ranging from 1/4HP to 1HP. What is the major determining factor that makes a good quality...
  4. beatcan

    What makes a quality motor from a poor quality

    Our company is sourcing motors from China for exhaust fans. These are PSC motors, ranging from 1/4HP to 1HP. What is the major determining factor that makes a good quality motor good. Is it the quality in materials (i.e. copper, laminations, slot liners etc.)? Workmanship? Engineering...
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