Guest Scott Roberts Posted July 28, 2008 Share Posted July 28, 2008 HELP, I'm doing my own cad plating which is coming out nicely,however I have encountered some problems pits in some steel parts. I don't know how to fill them. Filling pits in painted parts has not been much of an issue except for parts that I used eastwoods chassie black on. I have been using JB weld like putty for that. I just can't figure out what to use pryer to cad plating to fill the pits. Some I have polished out but others are to deep. Any help would be great!!!Thank you, Scott Link to comment Share on other sites More sharing options...
JFranklin Posted July 28, 2008 Share Posted July 28, 2008 You could use solder, that is one method of removing pits before chrome plating pot metal. Link to comment Share on other sites More sharing options...
Guest simplyconnected Posted July 28, 2008 Share Posted July 28, 2008 You could MIG weld with steel or bronze (brass). I grind/sandblast/HCl-etch, or drill all the rust out first, weld, then file or grind smooth. Using lead solder is ok if you copper plate first, then copper plate again, over the solder.Metal finishing steel is usually done by dinging out (from the under side), and filing the surface smooth. Link to comment Share on other sites More sharing options...
mrpushbutton Posted July 28, 2008 Share Posted July 28, 2008 as simply connected advises, you need to start with copper plating. You can fill deep pits with solder, file/sand smooth then replate with copper, or if they are shallow pits you can just have the part built up in copper and then sanded down until smooth. There is a definate break-even point with this method based on surface area, enough to make the solder method attractive if the work is big enough. Link to comment Share on other sites More sharing options...
Earl B. Posted July 28, 2008 Share Posted July 28, 2008 Scott, what product are you using for your plating? Thanks, B Link to comment Share on other sites More sharing options...
Guest Scott Roberts Posted July 29, 2008 Share Posted July 29, 2008 Sorry guys, I guess it would have helped if I told you what I was using. I have eastwoods zinc tin plating system. It's not true cad. On thick sheet metal parts I have punched the back side and smoothed the pits out. The problem is with thick brackets I can't punch, and bolts that I can't find. I don't mind welding a few pits but 50 or so over a two inch area is a bit time consuming. Some of my finished bolts are pictured on the WTB forum. I know we all have some rust to deal with I just havent seen any topics about how to deal with pitting for certin coatings. Thank's again for any help Link to comment Share on other sites More sharing options...
Matt Harwood Posted July 29, 2008 Share Posted July 29, 2008 Can you paint the parts instead? There are some very convincing paint finishes that simulate cad plating. The brake baking plates on my '41 Century are supposed to be cad plated. I powdercoated them instead: Link to comment Share on other sites More sharing options...
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