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Facing/Chasing Areas Other Than BB & Headset

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Facing/Chasing Areas Other Than BB & Headset

Old 05-16-16, 10:30 AM
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Facing/Chasing Areas Other Than BB & Headset

I've got a customer who had his DH frame recently painted, and we are handling the reassembly. The painter is an idiot, and taped off exactly one thing: the BB. Now, I can handle facing and chasing things such as headset, BB, brake tabs, and anything threaded. But there are many hinges and faces (he even painted over some bearings in the swingarm) that I've never needed to face before. What tools or techniques can anyone recommend to do so with professional quality? I'm kinda at a loss. We told the guy before he had it painted that any facing work we would have to do is extra, but this is just ridiculous..
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Old 05-16-16, 11:37 AM
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Thanks for sharing , work through it.
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Old 05-16-16, 12:03 PM
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Would it be better to try to remove the paint in a chemical way as opposed to a mechanical way?

Hmm, might be worthwhile to determine if this is actually necessary as well. Worst case scenario may be to contact a independent full-suspension frame builder and find out what they do?
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Old 05-16-16, 05:40 PM
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Can you just scrape off the overspray with a sharp knife or single-edge razor blade? There should be no reason to remove metal.
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Old 05-16-16, 06:03 PM
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As you know, most scraping tools you're going to have are going to be some kind of steel (razor blades and picks) and I'm assuming a lot of what you're cleaning is going to be aluminum (softer) so it's going to be tough. For things like the swingarm hardware, I think my first attempt would be to cut the paint around the hardware with an exacto or other razor blade, then try some sort of plastic scraper to scrape the paint off. I think I would also experiment with a Dremel with the softest rotary brush they make for it.
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Old 05-17-16, 01:34 PM
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The paint job really is good, extremely hard. Not doable with just a razor blade in hand.
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Old 05-17-16, 01:36 PM
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After we told the guy how much we would be potentially charging him to do all this prep work (in the 150 range) he decided to take it to a machine shop and have them try it. Disaster averted...
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Old 05-17-16, 07:28 PM
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The common way to assembly prep a new paint job is to first cut the corners then remove the paint from the faces. By cutting corners I mean to take a razor/file and without chipping the paint remove just the paint that is on the edge/corner of any flat surface that will receive a part. So the BB will get the outer edge of the face, the corner at the outside surface of the shell, filed at a 45* angle just enough to break through the paint layer. Then when the face has it's paint removed (whether with a facing cutter, a file or a razor) so the chance of a chip traveling around this corner/edge is FAR less. The same goes for any taped off surfaces. the edge of the tape gets a razor cut through the paint so when the tape is lifted no chips will pull up paint.

I would use these methods to clean up all surfaces of pivot bosses and such before assembly is started. While some better painters might do this it's usually the client that does, IME. Andy
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