Saturday, 16 February 2013

Working With Metal


I made a prototype of a dovetail scraper knife to be used with an offset marking technique, more of that at a later date. I'm using Japanese scraper steel bought from Dictum in Germany, I'm so glad they changed their name from Dick! The steel is just 0.5mm thick and so needed to be cut carefully  in order to keep it flat. I sandwiched the steel in 2 layers of 1/4" MDF attached with double sided tape, very useful stuff.


I used a standard 10 tpi carbon blade which did the job but didn't stay sharp for very long. The Japanese steel had already been hardened to Rc 54, so if I had any quantity to do I would use a Bi Metal HSS blade.


With the steel still sandwiched I cut the blade to length as well as the 45 degree end. The holes for the rivets were drilled before the MDF was prised from both sides. The resulting blade stayed dead flat without any turned edges and the finished prototype knife came out well.


10 comments:

  1. A dovetail scraper knife, what? what? & what? Should be interesting, knife looks good.

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  2. Hi Mark,
    It's an offset method of creating a groove to drop the saw into for cutting the pins. I'll be doing a You Tube video on Friday which will explain all. Should be up in about 4 weeks. All the best, David.

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    1. Sounds something like creating a notch to set your saw when creating a dado, looking forward to it, something new, at least to me it is,where did you see it first? I never seem to find out things from the original source, for example Rob Cosman`s dovetailing method, originator Alan Peters, David Charlesworths many great techniques (not all)come from Robert Wearing.

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  3. Hi Mark, I was first shown this by my old woodworking tutor he used the corner of a cabinet scraper and veneer as a spacer. The techniques you attribute to Alan Peters and Rob Wearing are likely to have originated way back, all they are doing is making sure the techniques are passed on for the next generation. All the best, David.

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  4. Is this the same idea as a kerf knife? Something like this
    http://www.glen-drake.com/v-web/ecommerce/os/catalog/index.php?cPath=27&osCsid=69b6086f432ba4cb3d9a49eb4bd07d22

    Looking forward to the video. Are yo planning any new dvd's?

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    1. Yes it's the same idea. After playing around with a few different versions, the one from Glen Drake came out best, so I've given up on the idea of making one and just going to advise people to buy there's. I've just done a video for You Tube today including this technique, it will be up by the end of next week. I'm not planning any more videos for now as I'm concentrating on You Tube. All the best, David.

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  5. Shame you're not planning any more dvd's as I was hoping you might do one on box making and your workbench. You tube is better than nowt though :)

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  6. oh such a great blog thanks for the information!littlehamptoncuttingtools

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