Dust Free Friction Material Needed
Dust Free Friction Material Needed
(OP)
BACKGROUND: I am enhancing a proprietary moldless casting machine that centrifugally casts a near-perfect coating on a curved surface. The degree of perfection inversely depends on the variation in angular velocity. A servo motor drives the unit through a 100-to-1 gear speed reducer.
PROBLEM: Backlash in the gearing prevents the servo drive from maintaining a constant angular velocity.
PROPOSED SOLUTION: Provide a relatively small amount of parasitic torque in the form of a brake such that backlash is eliminated in the gearing.
NEW PROBLEM: After trying several styles of strap brakes, I've eliminated brake squeal by using a 3-1/2" 410 SS disc brake and a bicycle caliper. The current problem is DUST - this contaminates the surface of my cast workpiece. I've tried several commercial forms of disc pad compounds including Ceramic-Carbon Sintered pads which I incorrectly believed was dust free.
SOLUTION NEEDED: What type of brake pad material will emit the minimum of dust? And just as importantly, where do I get this material? I've tried the pads available from the caliper manufacture and they are VERY dusty.
Thanks in advance for your kind reply!
S.D.
PROBLEM: Backlash in the gearing prevents the servo drive from maintaining a constant angular velocity.
PROPOSED SOLUTION: Provide a relatively small amount of parasitic torque in the form of a brake such that backlash is eliminated in the gearing.
NEW PROBLEM: After trying several styles of strap brakes, I've eliminated brake squeal by using a 3-1/2" 410 SS disc brake and a bicycle caliper. The current problem is DUST - this contaminates the surface of my cast workpiece. I've tried several commercial forms of disc pad compounds including Ceramic-Carbon Sintered pads which I incorrectly believed was dust free.
SOLUTION NEEDED: What type of brake pad material will emit the minimum of dust? And just as importantly, where do I get this material? I've tried the pads available from the caliper manufacture and they are VERY dusty.
Thanks in advance for your kind reply!
S.D.





RE: Dust Free Friction Material Needed
You can look at metallic parts, but there will be higher noise and vibration. You may need to provide a lubricant at the surface, and you may need to provide cooling for the part.
Perhaps you can work on isolating the braking system from the casting chamber. How about a vacuum or forced air system?
Regards,
Cory
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RE: Dust Free Friction Material Needed
Rod
RE: Dust Free Friction Material Needed
An electric field.
Look at engine dynos that use water brakes or eddy current brakes.
Regards
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