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Bernd:
I'll add a bit more to what Bogs said. Were I used to work they used carbide scrapers. But as Bogs said use HSS or carbon steel.

Scarpping steel is tough. Scarpping is mostly done on cast iron. Because of cast irons make up it actually flakes were as steel doesn't. That's why the scratches in the steel. Next time try a bit of cast iron to scrape.

Bernd

Darren:
Remind me John, did you not say to me in your workshop that you can't get a really sharp edge on carbide but you can HSS?

That would explain it

bogstandard:
Darren,

You can get solid carbide that will sharpen up like a razor, and keep its edge, milling cutters and brazed lathe bits are just two examples, but they chip very easily, replaceable tips are usually made by a pressure and heat process and don't need a very sharp edge for what they do. I can't go into deep details because I don't know the full story behind moulded carbide, maybe someone in the know could elaborate a little more.
All I can say is that in all the years I have worked on machinery, we always used steel scrapers (as I said, old files, or bought curved ones for scaping bearings), and have never seen one either made of, or edged with tungsten. Maybe they are available, but I have never come across any.

As Bernd said, usually scraping is done on cast iron or cast steel, and bearings, either white metal or bronze (both very soft materials).

John

Darren:
Ah, ok John, thanks for the clarification. Yes pressure moulding would be hard to get an edge with.

Might be an interesting exercise if it was ever needed. I think the machine would have to be worth the effort though.
Talking of which, that chap with the grinder, do you think he went a bit far? First use and it would be out again by his standards !!

Still, as long as he enjoyed doing it, seemed to  :dremel:

rleete:
My very first real job was a summer stint at Hardinge Brothers in Elmira.  At the time (early 80's), they were building the Superslant lathe.  There were old-timers there that hand scraped ways, and could get them within millionths of an inch flat and true.  They all looked to be well past retirement age back then, and I'm sure none of them are around today.

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