Jig For Sharpening Jointer Blades
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a simple jig for grinding a perfectly straight, razor-sharp
edge on your jointer knives.
a 1/8" wide slot in a 6" length of 2 x 4 at a 45-degree angle*,
as shown in the photo.
pre-drill and drive a #12 x 1" roundhead wood screw (with
washer) into your groove, 3/4" in from each end. Be sure
the point of your screw will engage your Jointer Blade, when
inserted into the slot.
a dull Jointer Knife into the slot and tighten down the screws
to hold it securely. Set up your MARK V in the Disc Sander
mode, with the rip fence angled in ever so slightly towards
the "down" side of the disc...just as you would
if you were Disc Sanding several workpieces to the identical
Load the sander with fine (100-grit) sandpaper.
the knives at speed setting "D" by pushing the jig across
the table, "up" side to "down" side, holding it firmly against
the fence. The sander should just begin to scrape the knife
as it passes to the side that is rotating downward. Make repeat
passes, moving the disc in 1/64" at a time, until all the
scores and nicks disappear form the knife.
would prefer to purchase a jig that's been designed and built
specifically for sharpening Shopsmith Jointer Knives and Planer
Blades...rather than build one yourself...click
here for complete details. This special Sharpener works
with Shopsmith's Conical
Sanding Disc to quickly and easily produce super-sharp
edges on your knives.
is a good all-purpose angle. However, this angle can be varied
sltightly, if you work primarily with soft woods (use 42-degrees)
or hardwoods (use 36-degrees).
Click image for larger view.
image for larger view.