-- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing

on this site
current topics
topic 10705

Bearing polishing in a vibratory machine


We want to polish a thrust ball bearing of size 60 mm dia. , thickness 5 mm, inner hole 30 mm. Our bearing is case hard at hardness of 60. Bearing is made up of Carbon Steel. When we make our piece harder by giving it heat it becomes black. For polishing this bearing we have made our own vibrating. The tub is 24î in radius and its edges are round. We have given it centrifugal system. The thing we don't know is that which kind of media we should use to give it a glass shine. Or what else we can do for polishing or giving it glass shine.

Please help us.

Yasar Arslan
- Rawalpindi, Pakistan


It sounds like your machine is a centrifugal system, not vibratory. Normally non-ferrous parts are worked with plastic preformed shaped media. If you have heat treat scale on them, you may want to consider a ceramic media as a first step, then a medium grade plastic. The larger the size the faster it will work. After plastic, your RMS should be around 18-22. Unless you need a smoother finish, you can finish these parts off with either steel or porcelain ball media for brightness. To get smoother finish, you need another abrasive before either burnishing or organic polishing.

tony kenton
AF Kenton
Nova Finishing Systems Inc.
Hatboro, Pennsylvania


Regarding last answer I gave. Ooops. You are working with carbon steel. Forget plastic media. Use a large coarse fast cut, then medium to get 18-22 RMS. Use fine to get to 12-16 RMS, then burnish with good acidic compound. Also, there is a one step chemically accelerated process using only porcelain media.

tony kenton
AF Kenton
Nova Finishing Systems Inc.
Hatboro, Pennsylvania

This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site


Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices

©1995-2018, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.