Recent content by dswarrenga

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    Motor Sizing Help (Basic Rotational Inertia Problem)

    There is no flexible coupler. The shaft of the motor simple is inserted into the bottom of the shaft and pinned in place with a key pin. There is some flexibility permitted, but not a great deal. Unfortunately the person who designed this is no longer availible for consult. I clocked the...
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    Motor Sizing Help (Basic Rotational Inertia Problem)

    The motor specs indicate a max torque of 162 oz*in @ 175 pulses/sec, input power 8 watts, voltage 12vdc. Unfortunately that's it. The printout from the cad program is as follows: VOLUME = 4.9690188e+01 INCH^3 SURFACE AREA = 6.3583122e+02 INCH^2 AVERAGE DENSITY = 2.1778886e-01 POUND...
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    Motor Sizing Help (Basic Rotational Inertia Problem)

    The motor mounts to the very bottom shaft. When activated, it rotates the entire assembly. I have modeled the coordinate systems as shown at the bottom and have calculated the mass at 10.8 lbs and the Izz at 90.7 lb*in^2. The square plate at the bottom is rigidly affixed to a large box and...
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    Motor Sizing Help (Basic Rotational Inertia Problem)

    Hello everyone, I'm having trouble with an application involving rotating a 10.8lb device through 60 degrees of rotation using a stepper motor (Hurst 4006-004: step angle .1 degrees, Output speed 3.33 rpm, rated torque at 175 pulses/sec of 162 oz-in). It appears that the motor is...
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