khaled alaassmi and majid al qutaim. project goal the goal of the project is to determine the...
TRANSCRIPT
Project Goal
The goal of the project is to determine the offset that provides the best cutting performance for M-18 Sawzall.
Cutting GeometryA=12.2mm= 0.4803 inB= 56.9 mm= 2.24 inC= 19.812 = 0.78 in
A C
B
Angle = z
Pin A
XOut
Drive Gear
Direction of Rotation
C = Offset
Displacement Analysis of Offset Slider Crank Mechanism Using a Vector Loop Closure Equation:O2A = O2D + DB + BA
D
a
bc
Analysis using linkages software
Linkage software was used to make the analysis at 3 different offsets
Offset of 0.78 in Offset of 0 in Offset of -0.78 in
Physical Testing
2 different offsets 10 runs each offset At an offset of 0.78 in and 0 in The average cutting time for each offset
was calculated Test was performed on 2 x 4” wood. The applied load on the blade was 7.4 lb
Physical testingCutting performance = Time required to cut through 2x4 pine board
At C = 0 in, Tavg = 8.9 s, sd= 1.4
At C = 0.78 in, Tavg = 6.3 s, sd= 0.3