Page 464 - NORTON cutting-off and grinding wheels - industrial

464 TECHNICAL INFORMATION
TECHNICALINFORMATION
Aggressiveness increases as angle increases
HARD SOFT
Contact surface decreases as lands decrease giving a more
aggressive, harder wheel
CONTACT WHEELS
Many machines use contact wheels as a backing for belts. Contact wheels are generally covered with
rubber, polyurethane, steel, rubber foam, felt, or compressed canvas, and are classified from soft to hard,
with or without serrations. Using a different type of contact wheel has a direct effect on the end results.
• Harder contact wheels provide a higher cut rate, a rougher surface finish & generate a much more uniform
surface than softer contact wheels. They are used with stiff belts for a faster cut
• Softer contact wheels provide lower cut rates, a better surface finish & follow the contours of the part.
They are generally used for finishing contoured parts or for generating slightly rounded surfaces. They are
much less hard wearing on the belt & its joint
The design of the contact wheel will also have an effect on the contact area, which in turn affects grinding
pressure.
• Contact wheels with a larger diameter act softer & should generally be used on larger surfaces
• Serrated contact wheels act harder but should generally be used on smaller surfaces
JOINT TYPES
Belts are made with a standard joint design best adapted to the product and its main application:
CONTACT WHEEL TYPES
Butt joint with tape Overlap joint with no topskive Overlap joint with extra topskive