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Engineering Guide

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Horsepower Required To Drive Brushes

Four Common Factors Governing the Horsepower Necessary to Drive a Power Brush

  1. Brushing pressure required.
  2. Resistance between work surface and brush (trim length).
  3. Speed of the brush.
  4. Brush face width.
Horsepower Approximation Guide
(Based upon the medium brushing action for 1" brush face)

Brush Diameter Motor Size RPM
4" 1/4 H.P. 3450
6" 1/2 H.P. 3450
8" 3/4 H.P. 3450
10" 1 H.P. 1750
12" 1 H.P. 1750
15." 1 1/2 H.P. 1750


Wider face brushes require additional horsepower dependent upon the relative brush load. Long trim brushes can usually be operated with less horsepower than short trim brushes.

Recommended Surface Speeds for Brushing Applications

Application Surface Ft. Per Minute
Removing Burrs 5,500 to 7,500
Removing Scale 7,500 to 10,000
Cleaning Welds 7,200 to 9,400
Edging Blending 4,700 to 7,500
Cleaning (dry) 4,000 to 5,000
Cleaning (wet) 1,900 to 4,000
Surface Polishing 6,400 to 8,000
Surface Buffing 8,000 to 10,000


Brushing Action
Table of Surface Speeds (Peripheral Speed in Ft./Min.)

RPM 1" DIA 2" DIA 3" DIA 4" DIA 6" DIA 7" DIA 8" DIA 10" DIA 12" DIA 14" DIA 15" DIA
900 236 471 707 942 1414 1649 1885 2356 2827 3299 3534
1150 301 602 903 1204 1806 2107 2409 3011 3613 4215 4516
1200 314 628 942 1257 1885 2199 2513 3142 3770 4398 4712
1500 393 785 1178 1571 2356 2749 3142 3927 4712 5498 5891
1750 458 916 1374 1833 2749 3207 3665 4582 5498 6414 6872
2000 524 1047 1571 2094 3142 3665 4189 5236 6283 7330 7854
2400 628 1257 1885 2513 3770 4398 5027 6283 7540 8796 9425
2800 733 1466 2199 2932 4398 5131 5864 7330 8796 10263 10996
3000 785 1571 2356 3142 4712 5498 6283 7854 9425 10996 11781
3200 838 1676 2513 3351 5027 5864 6702 8378 10053 11729 12566
3400 890 1780 2670 3560 5341 6231 7121 8901 10681 12462 13352
3750 982 1964 2945 3927 5891 6872 7854 9818 11781 1374
4000 1047 2094 3142 4189 6283 7330 8378 10472 12566
4500 1178 2536 3534 4712 7069 8247 9425 11781 14137
5000 1309 2618 3927 5236 7854 9163 10472 13090
5400 1414 2827 4241 5655 8482 9896 11310
6000 1571 3142 4712 6283 9425 10996 12566


Brushing Action
There are many variables in Power Brushing conditions. In many cases, one or more Power Brushes may accomplish the same results; however, if one brush does not accomplish the desired results, follow the suggestions below:

Desired Change in Results
Suggested Change in Brush

Faster Action
  • Run brush faster.
  • Use heavier wire or filament
  • Use brush with shorter trim length
  • Use larger diameter brush or increase RPM
Finer Finish
Use finer wire or filament
Try tampico or abrasive nylon filament brush.

Reach Irregular Surface Area
Use Brush with longer trim length for greater flexibility

Shorter Life
Use finer wire and longer trim

Remove Burr Instead Of Roughing or Preening It
Increase brush speed
Use brush with shorter trim
Check brushing pressure to determine if tips are cutting not wiping.

Note: The speed at which the brush rotates is an extremely important factor. (See Table of Surface Speeds).

Portable Tools
河北快乐十分 The maximum recommended diameter brush to use with electric or air portable tools is 6".