Idler Pulleys - LP Series Pulleys

Pulleys
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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

*NOTES: 1. For availability of bushings and bearings, please click here.
2. Pulleys in the above chart are sold with an incomplete hole (cored). When machining these, care should be taken to make the bore concentric with the outside diameter. This is normally done in a lathe. Completing the bore in a drill press is not recommended because of possible misalignment and loss of concentricity. SAVA has semi-automated equipment to perform this according to your specifications.
3. Maximum load indicates allowable load for pulleys furnished with bearings under static load conditions. For long pulley fatigue life, a load equal to 25% or less of the maximum load column is recommended

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.

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.