Planetary Roller Screws, Diameter: 56X12

Product Details

Rotolinear Systems – Planetary Roller Screws Rotolinear Systems can supply Planetary Roller Screws in various sizes and specifications. Roller Screws convert rotary torque into linear motion, similar to acme screws or ball screws. However, they can operate at much higher speeds and withstand more frequent cycles than both acme and ball screws, making them an ideal choice for demanding, continuous-duty applications. Compared to similarly sized screws: Roller screws are more efficient than acme screws. They can carry larger loads than ball screws – up to 779,000 lbf. Example: The photo attached shows a roller screw of 56 × 12 × 2700 mm length with LH-RH combination. Advantages of Roller Screws High load capacity → Longer service life. For example, in a 2,000 lbf average load application on a 1.2 in. screw diameter with a 0.2 in. lead, a roller screw provides 15× longer life than a ball screw. Higher operating speeds Ball screws are typically limited to 2,000 rpm due to ball-to-ball collisions. Roller screws, with rollers fixed in a planetary arrangement by journals and gears, can operate at 5,000 rpm and above, allowing significantly higher linear travel rates. Versatile nut configurations Single Nut: Long service life, low backlash (<0.001 in). Split Nut: Eliminates backlash with a precision-ground spacer but reduces dynamic load rating by ~38%. Double Nut: Two nuts preloaded against each other, reducing backlash with life expectancy similar to single nut, but at higher cost. Roller Screw Specifications Key variables to consider when specifying a roller screw: Diameter Lead Sealing Budget Maximum linear speed Maximum load capacity Maximum stroke length Required precision Tolerance to backlash Contaminant environment Level of protection required In high-speed roller screw applications, natural frequency vibrations can occur. The critical speed—determined by diameter, length, loading direction, and bearing arrangement—must always be calculated, and operational speed should remain below the critical speed. Cost & Service Benefits Although roller screws have a higher initial cost, they provide substantial long-term savings: Require less frequent replacement Lower maintenance costs Typically cost 50% less over lifetime compared to cumulative ball screw system costs About Rotolinear SystemsRotolinear Systems, based in Bangalore, is a leading supplier of CNC machinery parts in India, specializing in: Ground Ball Screws Linear Guideways Precision Locknuts Metal Bellow Couplings Taper Bush Clamping Elements Shrink Discs Rigid Couplings Keyless Clampings Locking Devices Flexible Disc Couplings Servo Couplings Torque Limiters Safety Couplings Servo Insert Couplings