|Project by SASmith||posted 12-29-2011 10:18 PM||16949 views||82 times favorited||46 comments|
I like to think of this jig as Tim Taylor’s(from the tv show Home Improvement) take on the Scary Sharp Method.
I made my jig out of plywood to help prevent warp.
Glue and clamp together.
Make two 45 degree rip cuts with an 1/8” thick blade, rotating the jig 180 degrees after the first cut.
Move the fence over enough to roughly center the third kerf.
Cross cut to a length 1/16”-1/8” less than the length of the planer knives. 14 7/8” in this case.
Insert the knives into the slots. Set the jig on a flat surface and while applying downward pressure screw the end caps on.
The rusty knives in the jig before starting to sharpen.
I decided I wanted the knives held more securely and added an F-clamp to apply additional pressure to the end caps.
Here you can see that having a thick jig will help to keep the jig stable while pushing the jig across the sander.
I started with a 40 grit belt and sanded until I exposed fresh metal free of nicks.
Then I coated the knives in magic marker ink and changed to an 80 grit belt and sanded until all the 40 grit scratches were removed. Then ink & 120 grit, ink & 220 grit, ink & 320 grit. This is where I stopped since they were razor sharp and would shave arm hair.
The last step is to remove the bur on the back side of the knives. I did this by dragging the knife across the 320 grit belt(sander NOT running).
The wad of steel wool looking stuff is the amount of metal shavings removed during sharpening.
This jig could also be used by hand if you don’t have a Ridgid OSS (or used as an excuse to buy a new tool)
You would need a piece of granite, glass, or your tablesaw top with PSA sandpaper applied and lots of elbow grease.
This jig is a combination (and improvement imo) of LJ Garry’s jig: http://www.superwoodworks.com/Projects/JKnifeJig.htm and the Deulen jig http://www.amazon.com/Deulen-Jointer-Planer-Knife-Sharpening/dp/B004VDK692. Thanks to both of them for the inspiration.
Thanks for looking.
-- Scott Smith, Southern Illinois