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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.

 

RE: Dust Free Friction Material Needed

You need to stop looking at the friction materials used for vehicles - they are designed to behave just as you describe.

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

Electro magnetic retard?

Rod

RE: Dust Free Friction Material Needed

I'm with Rod.

An electric field.

Look at engine dynos that use water brakes or eddy current brakes.

Regards

eng-tips, by professional engineers for professional engineers
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