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Tool Talk Discussion Forum

Fish Scaling Finish

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fencline

09-13-2004 17:43:01




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Perhaps my terminoligy is wrong but I would like to know if there is a special tool for making that kind of finish. I am refurbishing a Bridgeport and would like to do this finish on the bare metal surfaces. (I am not scraping the ways, which looks similar)Any suggestions would be appreciated.
Andy




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Irv

09-14-2004 07:34:12




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 Re: Fish Scaling Finish in reply to fencline, 09-13-2004 17:43:01  
You are referring to "jewelling" - a pencil eraser and some lapping compound wil do it - slow speed and practice on another piece of metal first. Irv



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Roger P.

09-13-2004 21:24:29




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 Re: Fish Scaling Finish in reply to fencline, 09-13-2004 17:43:01  
I don't know how they do it, to be honest, but it is not cherrying nor is it scraping. Looks like a very slight pattern that is applied after the ways have been ground. If you run your fingers across it, you will feel a very slight texture. This tells me that it is not scraped, as scraping would be used to flatten and smooth the surface, if anything. Also, the pattern is perfectly replicated at even intervals. Hand scraping would not provide this pattern either. I think it is a slight texturing to aid in lubricant retention for the ways of the machine. I wonder if a template is placed over the ways and then it is lightly acid etched or blasted onto the surface? I was using a Bridgeport mill for 10 weeks this summer, during a contract position in plant maintenance.

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Davis In SC

09-13-2004 21:48:28




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 Re: Fish Scaling Finish in reply to Roger P., 09-13-2004 21:24:29  
The pattern on the mill ways is known as Flaking... I used to know a machine scraper that could apply that pattern. he was secetive about it, but did tell me he used a Dapra Power Scraper tool. Pattern is only a few tenths deep , but it retains oil.



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MarkB_MI

09-13-2004 18:55:06




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 Re: Fish Scaling Finish in reply to fencline, 09-13-2004 17:43:01  
Google on "engine turning" and you'll find a ton of information.



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Fred OH

09-13-2004 17:50:04




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 Re: Fish Scaling Finish in reply to fencline, 09-13-2004 17:43:01  
I think what you are referring to is cherrying...a piece of wood in a spindle and some valve lapping compound on it and use an overlapping pattern. Fred OH



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