
#1
Feb2314, 11:20 PM

P: 1

Hello guys, i have a problem in determining a thickness of a plate. i have a motor (m = 17 kg) attached to a plate. the design can be seen in the attachment. i need to know the dimension of "t".




#2
Feb2414, 04:45 PM

P: 157

Use a caliper if it already exists. Or, is this a homework type problem to calculate the minimum t to hold the 17kg? If you just want to make something, use 1/4" alum.




#3
Feb2414, 06:11 PM

Sci Advisor
HW Helper
PF Gold
P: 5,963

If I convert to customary USA units, the motor ways say 50 pounds lets use 100 pounds to account for vibration impacts and throw a safety factor of 4 on it. That's 400 pounds. Assume a 12 inch diameter motor 12 inches long. Moment at plate = 2400 inch pounds. Load to one bolt is 2400 divided by 12 on 2 bolts, or bolt tension = 100 pounds. Moment to inner bolts is say 1000 in pounds. Using 30000 psi steel or aluminum, the required section modulus is 1/30 inches cubed and that is 10t^2/6 solve t = about 1/8 inch. Use 1/4 inch aluminum as suggested, or use 1/4 in steel for better plate rigidity. Based on a lot of assumptions here. Disclaimer: proceed at your own risk, the author absolves himself of all responsibility. 


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