shredder calculations .pdf
Original filename: shredder calculations.pdf
Author: hammad shakil
This PDF 1.5 document has been generated by Microsoft® Word 2010, and has been sent on pdf-archive.com on 01/05/2018 at 13:26, from IP address 60.50.x.x.
The current document download page has been viewed 4061 times.
File size: 581 KB (4 pages).
Privacy: public file
Download original PDF file
shredder calculations.pdf (PDF, 581 KB)
Share on social networks
Link to this file download page
3.6.1 Calculating Torque, shear force and diameter of the shaft
The free body diagram of the shaft of shredder is shown below.
The shear forces and shaft diameter
are calculated as follows;
Shear force to shred plastic (Fsh):
Figure 1Figure 11: Knife cutting forces and chipping diagram (Bello & Onilude,
Sut (PET plastic) = 55 MPa (Mathweb, n.d.)
Sus = 31.73 MPa
Assume F.O.S = 2
Cutting Force (Fc)
Sy = 80 Mpa (Warlimont H. , Martienssen, 2005)
Power at shaft
Moment at point C
Moment at point B
Since thermoplastics are elastic thus cutting is preferred over shearing.
Kt = 2.0
Kb = 2.0
Ccording to the objective applied force should be equal to 400 N (maximum force
exerted by a human.
To convert torque, the force in multiplied with lever’s length which is 0.4 m
400 x 0.14 = 56 N m
Converting Nm into pound force m
56 N.m = 12.5893 lb force m
Link to this page
Use the permanent link to the download page to share your document on Facebook, Twitter, LinkedIn, or directly with a contact by e-Mail, Messenger, Whatsapp, Line..
Use the short link to share your document on Twitter or by text message (SMS)
Copy the following HTML code to share your document on a Website or Blog