Carl Stahl Sava Industries, Cable Assemblies



Pulleys Catalog


Pulleys
(PDF 820 KB)


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Idler Pulleys »
LP Series Pulleys

SAVA
Item
REF. Old
Part No.
Plain Bore
Size Range
A* +.002
-.001
B
REF.
C
REF.
E
REF
R
REF
For
Cable
Sizes
Type Max. Load*
(Lbs.)
Approx.
Wt. Ea.
Oz.
LP0220 LP-22 .375 - 1.000 2.200 2.500 .250 .050 1/16 - 3/32 A 200 .7
LP0188 LP-18 .375 - .625 1.875 2.440 .687 .160 1/8 - 5/16 B 1600 1.3
LP0200 LP-20 .375 - .625 2.000 2.500 .438 .110 1/8 - 3/16 B 800 .9
LP0250 LP-25 .375 - .625 2.500 3.000 .438 .110 1/8 - 3/16 B 800 1.2
LP0256 LP-26 .375 - .625 2.563 3.000 .625 .190 1/8 - 3/8 B 1600 1.5
LP0300 LP-30 .375 - .625 3.000 3.500 .438 .110 1/8 - 3/16 B 800 1.4
LP0338 LP-33 .375 - 1.000 3.375 4.000 .500 .140 3/16 - 1/4 B 1400 2.5
LP0388 LP-38 .375 - 1.000 3.875 4.500 .500 .140 3/16 - 1/4 B 1400 2.8
LP0438 LP-43 .500 - 1.000 4.375 5.000 .500 .140 3/16 - 1/4 B 1400 3.5
LP0463 LP-46 .500 - 1.000 4.625 5.500 .625 .170 1/4 - 5/16 C 1600 4.3
LP0513 LP-51 .500 - 1.000 5.125 6.000 .625 .200 1/4 - 3/8 C 1600 5.6
LP0525 LP-52 .500 - 1.000 5.250 6.000 .625 .170 1/4 - 5/16 C 1600 5.9
LP Series Pulleys

Bore Wear on LP Pulleys Without Bearings
On lightly loaded applications where the working load is less than 10% of the maximum load, as shown above, it is possible to use these pulleys without bushings or antifriction bearings. Analyzing the wear characteristics, it was found that two factors directly affect the wear on bearings: pressure (P) and surface velocity (V). Working with these two factors, a relationship with the bearing wear has been developed. Tests were run on our Pulley Testing Machine with different sizes of pulleys under various load conditions. Results obtained so far are depicted in the graph below. Shafts and mating parts made from hardened and ground steel perform best, while unhardened steel surfaces will wear quickly in many applications, particularly if unlubricated. Our tests for pulley wear were run on ground shafts with no lubrication. Lubrication will reduce wear. It is difficult to estimate wear rates for lubricated bearing surfaces, since this depends, to a great extent, on the lubricant and the efficiency of its application to the bearing surface.
The following formula will predict the approximate bore wear on LP pulleys without bushings or bearings.

LP Pulleys

PV Factor = P x V

P = W
–––
(d x L)

V = (π x d x n)
–––
12

P = Pressure in p.s.i.
W = Load on bearing in pounds
d = Diameter of bearing in inches
L = Width of bearing in inches
n = r.p.m.
V = Velocity in feet/min.


Recommended Bore Dimensions
for LP Pulleys W/O Bearings

I.D.
Code
Shaft DIA.
Inches
Bore Dimensions
+ .002 - .001
1 3/8 .376
2 7/16 .439
3 1/2 .501
4 9/16 .564
5 5/8 .626
6 11/16 .689
7 3/4 .751
8 7/8 .876
9 1 1.002

Groove Wear
All of our tests show insignificant groove wear when used with coated cable at the end of 500,000 cycles.