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Masking of Caliper in Bore Area for Brake Application

October 5, 2008

We are the manufacturer of hydraulic brake systems. We are using caliper brakes for the front end. In this caliper(it is a s.g.iron casting) we don't need plating in the bore area. How to mask this area and without affecting any quality problem arise later like it gets rusted, degreasing solution left in the bore area etc.
I am in need of masking material and how to use it. Like before degreasing itself we will have to put the mask or only at the time plating etc.

Thiruvengadam Dhanasekaran
user of plating components - Chennai, Tamil Nadu, India

October 8, 2008

If the processing baths are not too hot (over 50oC), simple rubber plugs on both ends may work. Otherwise, the trapped air will expand and may pop them out. In that case you could make solid plastic inserts machined from barstock and secure them tight inside the bore. You may choose polypropylene, PVC or even nylon depending on the chemistry and temperatures they will be exposed to (which you didn't mention). Design them so you can install them easily and re-use them many times. G. Marrufo-Mexico

Guillermo Marrufo
Monterrey, NL, Mexico

October 9, 2008

Consider using silicone pull plugs. They are reusable if you take care of them. They stretch very well, so seal the entire bore.

James Watts
- Navarre, Florida

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