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www.techno-isel.com
Technical Information
100000
80000
60000
40000
30000
20000
10000
8000
6000
4000
3000
2000
1000
800
600
400
300
200
100
80
60
40
30
20
10
2516125161
37161
37101
31084
37084
43082
50101
62101
75101
37122
31032
37081
62102
75061
ONE END FIXED
OTHER END FREE
ONE END FIXED
OTHER END SUPPORTED
BOTH ENDS SUPPORTED
BOTH ENDS FIXED
REF
A
REF
B
REF
C
REF
D
6
10
12
15
12
18
24
40
48
60
30
36
45
20
24
30
30
36
42
70
85
105
60
73
90
50
61
75
INCHES
INCHES
INCHES
INCHES
LENGTH
TRAVEL RATE VS. LENGTH
FOR STANDARD ACME SCREWS
CRITICAL SPEED
PURPOSE
This graph was designed to simplify the
selection of the proper lead screw so as
to avoid lengths and speeds which will
result in vibration of the assembly
(critical speed). The factors which can
be controlled after a particular
maximum length is determined are:
method of bearing support and choice
of lead screw diameter.
USE OF THE GRAPH
1. Choose preferred bearing support
means, based on design
considerations.
2. On the proper bearing support
horizontal line (A, B, C or D) choose
length of lead screw.
3. Draw vertical line at the lead screw
length, determined at (2.), and draw
a horizontal line at the travel rate.
4. All sizes to the right and above the
intersection point in (3.) are suitable
for this application.
5. Screw sizes are coded as follows:
Diameter (in)
Threads / in
Starts
TRAVEL RATE
IN INCHES PER MINUTE
MAXIMUM LENGTH (IN.) ADJUSTED FOR BEARING SUPPORT
"Y" DIMENSION
