Coefficient of Friction Simplicity ® Plain Bearings
Coefficient of Friction A frequent misconception of Plain bearings is that wear and friction are basically synonymous, in that, high friction equals high wear or that low friction equals low wear. While there can be a relation between the two, they should be addressed as separate issues in the design process.
For example, dry running virgin (unfilled) PTFE on steel’s coefficient of friction (c.o.f.) is approximately 0.1 while filled PTFE’s c.o.f. can range from 0.125 to 0.4 depending on the fillers used. By comparison, however, the virgin PTFE will wear at a much greater rate.
FRICTION TEST SAMPLE #1
Conducted by: Dr. Tillwich GmbH Managing Director: Mr. Werner Stehr (World leading tribologist with a seat on the ISOTC123 Committee establishing standards for tribological testing) Bearing Material: FrelonGOLD ® Shaft Material: Standard RC60 steel shafting Surface Finish: 8-12 Ra Speed: 50 mm/sec. Load: 6 N Temperature: 25° C Lubrication: None Average Coefficient of Friction: FrelonGOLD = 0.125
FrelonGOLD ®
0.35
Test Parameters SPEED: 50 mm/s LOAD: 6 N HUMIDITY: 10% TEMP.: 25 C Running on Steel 210 mm/s for 3 min.
0.30
0.25
0.20
0.15
0.10
0.5
0
DRY
FRICTION TEST SAMPLE #2
Coefficient of Friction
.12 .11
0.1
.09 .08
0
2
4
6
8
10
12
14
16
18
20
22
24
25.68
Lubrication: None Surface Finish: 8 Ra Average COF: 0.10
Conducted by: FrelonGOLD material processor Bearing Material: FrelonGOLD Shaft Material: CRS 1018 Speed: 100 fpm Load: 100 psi Duration: 25.68 hours
Max. COF: 0.15 Min. COF: 0.08 Average Running Temperature: 95.4° F
142 Round Shaft Technology • pbclinear.com
Made with FlippingBook - professional solution for displaying marketing and sales documents online