Easson Premium SC-100, Manual, Page: 89 / 108

L
L X 1.005
function : Because plastic material shrinks during cooling
after the the plastic injection process, therefore,
when making a mould for plastic injection, the
dimensions of the mould cavity have to be expanded
or reduced according to a "shrink factor", ie
for normal ABS material, the "shrink
factor" is 1.005.
Normally, the mould maker has to calculate all the
reduced or expanded dimensions prior to the
actual machining, marking down the dimensions
on the drawing. The pitfalls of this
method areas follows:
1) It is a very time consuming process
2) Because there are a lot of calculations, it is inevitable
that some calculation mistakes, or incomplete calculation
( some calculations are omitted by mistake ) occurs.
There is also no easy method of verifying the calculated
dimensions and it is too easy to make mistakes, subjecting
the operator to heavy psychological pressure.
3) Mould work has to be correct first time, bearing in mind
the cost of the product.
SC-100 provides the world's first practical "SHRINKAGE CALCULATION"
function to help the mould maker calculate the shrinkage and verify
the calculated expanded/ reduced dimension.
1. Entering the "SHRINK FACTOR"
All the shrinkage dimensions are actually the multiples or divisions of a shrinkage factor, the shrinkage
factors change for different plastic material.Before machining the operator must enter the shrink factor
into the
SC-100.
Example : For material ( ABS plastic ), the shrink factor is 1.005.
- 81 -
DIGITAL COUNTER
Made in Taiwan
SC-103
SHRINK
1.005
abs
inc ½
ref
sdm
inch
mm
R
R R
9 8 7
4
5
6
1 2 3
CE
0
cal sin
COS
tan
M
in
M
R
+
ENT ENT ENT ENT
X
X
0
Y
Y
0
Z
Z
0
DIGITAL COUNTER
Made in Taiwan
SC-103
ABS
67.890
12.345
123.450
abs
inc
½
ref sdm
inch
mm
R
R R
9 8
7
4 5 6
1 2 3
CE
0
cal sin
COS
tan
M
in
M
R
+
ENT
ENT
ENT ENT
X
X
0
Y
Y
0
Z
Z
0