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Est. 1998 — 27 years of woodworking knowledge

REAL MILK PAINT

Shear Scraper

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Shear Scraper

#1

Shear Scraper

Jonathan Spool

>I have been attempting to make my own shear scraper inserts out of 3/4" M2 HSS tool bit stock.

For the first scraper I just beveled the edge of the stock, then cut off the end at 1/8". All that was left to do was drill a 1/4" hole in the center. Even my cobalt bits wouldn't scratch the surface.

I would like to cut the round stock at a 45 degree angle, in order to arrive at an eliptical shaped blade, but my abrasive saw won't alow me to do that without the metal getting red hot.

I would appreciate any feedback from anyone else who has worked with M2, in order to find out whether I should just open up the wallet and buy them already made, rather than setting up a machine shop to do the job!

Thanks

Jonathan

Re: Shear Scraper

#2

Re: Shear Scraper

John Lucas

>You won't hurt the HSS steel even if you get it red hot. I use an abrasive cutter in my angle grinder to cut and rough shape HSS planer blades. Instead of drilling I cut notches with the same blade. A good course grinding stone will fine tune the shape.

Recently I bought some drill bits by a company called Artu if I'm spelling it correctly. They drill through HSS. You have to run the drill press real fast because they actually abrade their way through instead of cutting. I ran the drill bit until it got red hot and all of a sudden it cut right through. I got them at my local hardware but had never seem them anywhere but at the trade shows before.

Re: Shear Scraper

#3

Re: Shear Scraper

Jonathan Spool

>Thanks John,

I'll have to find me some of those drill bits!

I always thought that if I went beyond bluing of the HSS, I would ruin it. Well, Thanks again for the advise, and I'm off and running!

Jonathan

Re: Shear Scraper

#4

Re: Shear Scraper

John Lucas

>johnathon

If you blue high carbon steel you reduce the hardness. You haven't necessarily ruined it but you will have to reheat treat it. HSS has to be heated extemely how to ruin it. There are also some drills called Big Dog tools that will drill HSS but I don't know where to get them.

Re: Shear Scraper

#5

Re: Shear Scraper

Jonathan Spool

>I found the Artu bits you suggested at

http://www.aubuchonhardware.com/brands/artu_usa_inc.asp

Very reasonably priced. They recommend drilling at 2000 rpm!

Jonathan

Re: Shear Scraper

#6

Re: Shear Scraper *LINK*

Phil Joines, Krum, Tx

>John,

That's Bad Dog Tools. I have one but haven't tried it yet.

I think they make them from SWMBO's fried eggs, harder than carbide :>)


Bad Dog Tools

Re: Shear Scraper

#7

Re: Shear Scraper

Ken Grunke

>I used a spear-shaped glass drill into a piece of HSS planer blade, for exactly the same purpose. Managed to get two holes done before it got too dull, for about $3--it was a 3/16" bit, and available at most well-stocked hardware stores.

BTW, my shear scraper, with an egg-shaped cutter on the angled end of a 5/8" shaft, works great for end-grain hollowing. You can rub the bevel on a pull cut, and bring out some nice shavings, and vary the angle of cut simply by rotating the tool.

It's catchy though, compared to using as a scraper.

I'll be making one to fit in my Jamieson bar to see if that solves the catching problem.

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