SPEED SELECTOR Fixed Center Drives

This type of drive package consists of a mechanically operated driver pulley mounted on the motor shaft, a spring-loaded pulley mounted on the driven shaft, and a variable speed belt running between the two pulleys.

The center-distance between the motor and driven shafts is set at one position, and never changes.

A 1:1 ratio between the motor and driven shafts occurs when the belt is in the median pitch diameter of both pulleys.

Output speed is reduced by turning the handwheel on the motor pulley, while the drive is running, to mechanically open the pulley face. This allows the belt to drop down to a lower pitch diameter on the driver pulley, while spring pressure in the driven pulley forces the belt to a higher pitch diameter. Speed increase is accomplished in exactly the opposite manner. By mechanically forcing the driver pulley faces together the belt is forced to a higher pitch diameter, and thereby drawn to a smaller pitch diameter on the driven pulley.

Series 21 Fixed Center Drives

*HP
Rating *Speed
Range Model Number
Driver / Driven
Belt
Size

1/4 986-3107 3C / 3M A

1/4 789-2152 3C / 4M A

1/4 623-1526 3C / 4M A

1/4 514-1182 3C / 6M A

1/2 875-3500 4C / 4M A

1/2 700-2230 4C / 5M A

1/2 580-1645 4C / 6M A

1/2 535-1365 4C / 7M A

1/2 455-1120 4C / 8-1-M A

3/4 715-4290 5C / 5M A

3/4 585-2710 5C / 6M A

3/4 535-2130 5C / 7M A

3/4 455-1595 5C / 8-1-M A

1 685-4650 6C / 6M A

1 630-3160 6C / 7M A

1 535-2310 6C / 8-1-M A

2 685-4450 7C / 7M B

2 608-3040 7C / 8-1-M B

5 645-4820 8-1-C / 8-1-M B

* HP Rating & Speed Range based upon 1750 Rpm input.

Series 45 Fixed Center Drives

*HP
Rating *Speed
Range Model Number
Driver / Driven
Belt
Size

1 506-3872 406/5116 1422V

2 435-4253 407/5128 1922V

5 444-3723 409/5151 2322V

10 495-3742 411/5112 3226V

20 630-3324 414/5122 3230HV

30 580-2778 414/5133 3230HV

40 480-2800 417/518-40 4430V

60 480-2800 417/518-60 4430V

100 1000-3000 419/520 4836V

* HP Rating & Speed Range based upon 1750 Rpm input.

Back to Speed Selector Home Page

Back/Forward to Capabilities / Fixed Center Drives / Adjustable Center Drives / Sheaves & Bushings / Adjustable Motorbases / Variable Speed Belts / Drive Accessories / Enterprise Drives /Product Design History/ Sales Offices

SPEED SELECTOR, Inc

Tel: 440-543-8233 . Fax: 440-543-8527
17050 Munn Road, Chagrin Falls, Ohio 44023 USA