Mind yer backs!

discussion of anything related to tools

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Mind yer backs!

Postby gavin » Tue Jan 01, 2013 3:25 pm

I decided to examine the backs of my various tools. From the maker they tend to have deep scratches in them. Ray Iles drawknives, Kunz spokeshaves and Stanley spokeshave blades all were quite serrated on the back when viewed under the microscope. So I polished the backs down to a smoother ( but not yet mirror surface). Depending on your grinding set up, it can take a long time. So if you have access to a belt-grinder or linisher, I recommend that.

Here is the back of spokeshave blade before grinding
back of blade 1.jpg
back of blade 1.jpg (80.03 KiB) Viewed 1890 times

and another with the screwdriver indicating the scratch-mark direction:
1980-01-01 00.01.38 (Small).jpg
1980-01-01 00.01.38 (Small).jpg (27.55 KiB) Viewed 1890 times

I then polished with my belt-grinder down a succession of grits from 180 to 240 to 320 to 600 and then to waterstones 1000 grit and 6000 grit.

The intervening results are shown here:
1980-01-01 00.01.07 (Small).jpg
Left-hand blade is ground nearly flat enough, but right-hand blade still shows scratches where the screwdriver blade is pointing.
1980-01-01 00.01.07 (Small).jpg (22.24 KiB) Viewed 1890 times

1980-01-01 00.00.21-1 (Small).jpg
A felt pen is good to colour the surface so you can see where you must still remove metal - and ink!
1980-01-01 00.00.21-1 (Small).jpg (25.13 KiB) Viewed 1890 times

1980-01-01 00.00.12 (Small).jpg
A trace of pen-ink remains - I need to grind to remove this.
1980-01-01 00.00.12 (Small).jpg (24.77 KiB) Viewed 1890 times
Gavin Phillips

- teacher, demonstrator & supporter of greenwoodworking & human-powered turning
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Re: Mind yer backs!

Postby chipsrod » Sat Jan 05, 2013 7:21 am

what you are showing is normal for meatl spocke shaves laping the back of the blades and cleaning up the faces of the tools and the throats is amust to a good working tool make a handel and lap the blade. i have a drawer full of them i never want to lap any again. kunz shaves chuck them into the dust bin they suck on the ones i have had the blades were so soft they were usless, i tryed to harden the blades to little or no carbon in the steel. of all the ones that i came by i have one left and on that one i made anew blade forit ugh not goodtools. i still prefer the old wood ones.
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