LumberJocks

Kerf Cutting Jig

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Project by HankLP posted 12-01-2021 10:18 PM 774 views 0 times favorited 6 comments Add to Favorites Watch

Kerfed lining provides a glueing surface on the inside of a guitar – or similar acoustic instrument – to mount the back or top of the instrument to the sides. It is slotted for flexibility and to conform to the curves of the instrument.

1. The first picture shows the toggle clamp which fixes the pivot bar in place. This adjustment sets the depth of the cut.

2. The second picture shows the stop bar on the back of the sled which limits the forward travel of the sled.

3. The closeup on the third picture shows the cut line on the pivot bar, and a second line to the left which is the reference line to advance for the next cut. Cut once, shift left to advance (~3/16”), repeat.





6 comments so far

View northwoodsman's profile

northwoodsman

693 posts in 5077 days


#1 posted 12-01-2021 10:38 PM

Very cool. I’m sure it comes in very handy.

-- NorthWoodsMan

View Foghorn's profile

Foghorn

1408 posts in 717 days


#2 posted 12-02-2021 12:16 AM

Nicely done. Very similar to my setup but I usually do reverse kerfed lining. Usually Spanish cedar or mahogany.

-- Darrel

View sras's profile

sras

6515 posts in 4460 days


#3 posted 12-02-2021 04:56 PM

Nice jig – always fun to see how people solve problems

-- Steve - Impatience is Expensive

View James E McIntyre's profile

James E McIntyre

1662 posts in 2623 days


#4 posted 12-02-2021 08:27 PM

That’s a great jig. I see the stop one the end of the jig. Is it adjustable?

The photos are very well done. I can see every detail.

-- James E McIntyre

View Ocelot's profile

Ocelot

3713 posts in 3969 days


#5 posted 12-02-2021 10:16 PM

Keifer often employed timing belts for his jigs. This reminded me of that.

-- I intended to be a woodworker, but turned into a tool and lumber collector.

View HankLP's profile

HankLP

155 posts in 1832 days


#6 posted 12-03-2021 04:32 AM

Thanks everyone for the comments. Enjoyed checking out your projects. Really love those guitars FOGHORN.

JIM M: The jig is adjustable, but not from the end stop which only prevents the sled from moving forward in the miter slot. The wood block on the top of the sled has a pivot screw on the right end which allows the block to move the kerf material into or away from the cutting blade. The toggle clamp holds the block in place once the desired depth of the cut is determined.

The cutting sequence is:
1. Push the kerf material into the blade
2. Pull the sled back free of the blade
3. Move the kerf material to the left
4. REPEAT steps 1 to 4

OCELOT:
I took a look at Keifer’s timing belt. Definitely an ingenious indexing method.

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