Guidelines

Hard Wheels: Are used for faster cutting and produce a coarser finish. For given material, hard wheels remove more stock than soft wheels
Smaller Wheel Diameters: Are used for faster cutting and a coarser finish.
Serrated Wheels: Permit faster cutting and result in longer belt life. Glazing is reduced and belt life can be extended
Higher Speeds: produce better finishes.

Contact Wheel Chart

Wheel Faces Types Durometers Recommended Uses
Plain or Serrated Super Soft Sponge  15 For fine polishing of wood or for contour sanding
Plain or Serrated  Soft  20 - 30  For polishing, fine finishing, or countour polishing of metal and wood 
Plain or Serrated  Medium Soft  30 - 40  For wood or metal work, stampings, die casting
Forgings and countour grinding 
Serrated  Medium 50 - 60  General purpose, standard 45 degree serration for stock removal and semi finishing 
Serrated  Medium Hard  60 - 70  Standard or scoop tooth serrations for stock removal, fast cutting, flash grinding on
stainless steel, and semi and metals 
Serrated  Hard  70 - 80  Standard and scoop tooth for grinding gray iron and hard metals 
Serrated  Extra Hard  80 - 90  Scoop tooth for heavy grinding on hardended steel, scale removal, and forgings 

 

Contact Wheel Troubleshooting Softer Wheel Harder Wheel Narrower Lands Wider Lands Higher Speeds Lower Speeds Change Lubricant Deeper Grooves True Wheels Use Coarser Grit
 Belts Glazed    ♦  
Belts Loaded 

 ♦ 

 ♦ 

 
Too Slow Cutting     

 ♦ 

 
Too Coarse   

 ♦ 

   
Burning   

 ♦ 

 

 ♦ 

 
Too Hard for Countour   

 ♦ 

   
Chatter   

 ♦ 

 ♦ 

 
Shelling Grain         
Overlap Marks     

 ♦ 

 

Grit Size vs. Contact Wheel Hardness

Grit Range Contact Wheel
Hardness Range
 
25 - 50 70A - 95A 
60 - 120 50A - 70A 
150 & Finer 30A - 50A