Register to reply

Plate thickness

by Mauriza
Tags: plate, thickness
Share this thread:
Mauriza
#1
Feb23-14, 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".
Attached Thumbnails
samping.jpg   depan.png  
Phys.Org News Partner Engineering news on Phys.org
Researchers discover cool-burning flames in space, could lead to better engines on earth (w/ Video)
Professors object to FAA restrictions on drone use
UConn makes 3-D copies of antique instrument parts
RocketSci5KN
#2
Feb24-14, 04:45 PM
P: 163
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.
PhanthomJay
#3
Feb24-14, 06:11 PM
Sci Advisor
HW Helper
PF Gold
PhanthomJay's Avatar
P: 6,036
Quote Quote by Mauriza View Post
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".
One way to do it is to calculate the force in each of the 4 bolts that fasten the plate to the wall. Then calculate the bending moment in the plate equal to the bolt tensile force times its perpendicular distance to the inner set of the bolt circle which holds the motor to the plate. Then check the plate stresses from that moment.
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.


Register to reply

Related Discussions
Thickness of Plate to withstand 100psi General Engineering 14
Calculating Minimum Plate Thickness General Engineering 10
Bending of a parabolic plate with some thickness Aerospace Engineering 4
Cantilever Effect on Different Thickness Plate Mechanical Engineering 7
Base plate thickness Mechanical Engineering 0