Making a scraper......?

[Stu Ablett in Tokyo Japan]

I've been wanting to make a scraper, a round nose, and pointy nose, etc etc.

I've been looking for some HSS M2 stuff, but, I've not found it yet :rolleyes:

I was wondering, would some planer knives work?

I found these...........

37239

37240

Sizes are 32 cm long, 3.5 cm long (including the bevel) and 4.5 mm thick.

I'm thinking I could do some grinding and make a decent scarper.........?

Cheers!

[David Fried]

Stu,

I'm no expert but they seem a tad thin. The old skew chisels I reground into scrappers are 9.5 mm thick. The thick bowl scrappers folks have been talking about here are 12.7 mm thick! I'd be leary of anything less than that 9.5.

[Dave Mcintire]

Planer knives are OK, it takes a lot of grinding but you can do it. old files work well too, they even have the tang there for the handle. The only trouble with planer knives it that they are a little thin for any scraper with a long wide blade and will tend to vibrate, so you may want to keep it a little short and narrow. If you use files, make sure to grind any of the file marks off the back of the tool or you will be filing away your tool rest. Make sure to use a metal furrel on the handle or it will most likely crack.

[Andy Hoyt]

Planer knives make lousy "scrapers", but they do make effective "shear scrapers".

And I've read many posts here from folks more knowledgeable than me who say that the steel in a typical file is far too brittle to serve as a "scraper".

[Christopher K. Hartley]

Planer knives are OK, it takes a lot of grinding but you can do it. old files work well too, they even have the tang there for the handle.

I'd like to caution you about old files. Unless you are knowledgeable about heat treating I'd stay away from them. Files are very brittle and therefore dangerous when used in this way. I don't normally like to contradict, but this is safety we are talking about. It's a lesson my Dad taught me years ago.

[Dick Strauss]

Stu,
Use some stout round rod (0.625-0.75"+) or flat stock...grind a flat on one end (as needed)...drill and tap a 1/4-20 hole (or metric equiv) ...make a bunch of teardrop or round scrapers out of the planer blades...mount them with a tap screw similar to these pics from an E-dude...

http://imagehost.vendio.com/bin/imageserver.x/00000000/joebill1/.mids/5.8inRound.JPG (http://imagehost.vendio.com/bin/viewimage.x/00000000/joebill1/5.8inRound.JPG?allow_mailing_list=1&owner_id=292493&allow_track_link=1&track=0234177aaf-4768d&sp=1)

http://imagehost.vendio.com/bin/imageserver.x/00000000/joebill1/.mids/fullgroup.JPG (http://imagehost.vendio.com/bin/viewimage.x/00000000/joebill1/fullgroup.JPG?allow_mailing_list=1&owner_id=292493&allow_track_link=1&track=0234177aaf-4768d&sp=1)

A friend did this and made a tool with two ends that hold different scraper bits. He did it with flat stock so no grinding was necessary and you could control the tool rotation better.

[Michael Cody]

Stu remember my suggestions about cold role round, with HSS too bits on the end for a scraper part ... easy to do, easy parts to find in any machine tool supply place.. Dick has right idea....

[Jason Boushard]

I dont have access to a tap set I may have to get one later to make some of those scrapers. I wish I had the money for a good bowl scraper.

[Dick Strauss]

Jason,
HF often has cheap tap sets for $10. I hear that they will work well for a few holes at least.