The Shop > Tools
Bogs... Is this your...
Brass_Machine:
Thanks for the link transcend.
Welcome to the club! Post up an intro!
Eric
Bernd:
--- Quote from: Darren on December 12, 2008, 02:48:02 PM ---Does anyone know of a site that details scraping, always wondered how it is done, not really scraping is it, more like chiseling off the high spots...
--- End quote ---
Don't know of any sites. Your right about about removing the high spots. But it's a bit more than that. My Dad was good at "scrapping in" as they call it. One reason is to make a surface level. The other is to fit parts together accuratley and square to each other. The getting them square to each other is the hard part of scrapping. You also need a flat surface to rub on the part your are going to srcape to see where the high spots are. It would be easier to show you than to type this all out.
Scrapping is mainly used to make a machine perfect, like blue printing an engine for a car. It's something that the model maker really doesn't need to do.
Bernd
bogstandard:
You will also find that a scraped suface will usually last a lot longer than a ground bed. The reason being, all the little indentations when scraping is carried out, retains oil in them, so there is always a fluid surface for the ways to ride on. Engine turning is another way, even though nowadays it is used more for decorative effect, it retains oil in the minute scratches produced by the process.
John
Darren:
I took a large flat carbide tip to a chunk of steel, fixed it to a "handle", but whilst I could remove metal ok, it seemed to scratch more than scrape.
Would like to give it a try another time maybe, got enough on me plate at the mo. :D
bogstandard:
Darren,
Carbide is no use, either carbon steel or HSS, both fully hardened. You can buy scapers, but it is easy enough to make your own out of old files, just grind the teeth off without overheating it (angle grinder with a metal cutting disc does a good job). then just keep the end slightly radiused acrosswise, and a nice sharp scraping edge. You will also need a large completely flat surface to transfer the engineers blue (not marking blue) to the surface to be scraped.
John
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