Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Dust Free Friction Material Needed

Dust Free Friction Material Needed

Dust Free Friction Material Needed

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!



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?



Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.

RE: Dust Free Friction Material Needed

Electro magnetic retard?


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.


eng-tips, by professional engineers for professional engineers
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close