LumberJocks

Yet Another Box Joint Jig

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Project by rmac posted 07-22-2010 05:45 PM 10783 views 69 times favorited 31 comments Add to Favorites Watch

The dial and the screw on the table saw fence micro adjuster posted by BritBoxmaker a few days ago reminded me of a similar mechanism on a jig I made a few months ago. Instead of allowing precise adjustments to the fence, my jig makes it easy to make precisely spaced crosscuts. I originally intended it as a box joint jig, but it’s actually useful for other operations as well.

My jig is a variation on a standard crosscut sled. The basic idea came from Matthias Wandel's orignal box joint jig. Instead of a crank like Matthias used, I put a knob with a dial on mine to move the carriage crossways past the blade. Each mark on the dial represents 0.002” of carriage movement, so with a little planning, you can make any sort of box joint you want. At first I had numbers on the dial, but I found that the colored lines and dots on the dial shown in the pictures made it easier to use the jig without making stupid mistakes.

The first few pictures show the jig itself. The last few show some of the first joints that I made with it.

Update, November 13, 2011: There’s now an article on my blog with plans and lots more details about this jig.

—Russ

-- My table saw laughs at hot dogs. http://thesorteddetails.blogspot.com/





31 comments so far

View Dennisgrosen's profile

Dennisgrosen

10850 posts in 1859 days


#1 posted 07-22-2010 06:20 PM

niice jiig
thank´s for sharing

Dennis

View levan's profile

levan

427 posts in 1724 days


#2 posted 07-22-2010 08:28 PM

I like your jig. May have to build one of these.

-- "If you think you can do a thing or think you can't do a thing, you're right". Henry Ford

View BritBoxmaker's profile

BritBoxmaker

4439 posts in 1780 days


#3 posted 07-22-2010 09:10 PM

Well I never thought of using it like that! Brilliant. I’m going to have to try this. The colour coded dot system looks like a winner too. Well done.

-- Martyn -- Boxologist, Pattern Juggler and Candyman of the visually challenging. http://www.theartofboxes.com

View a1Jim's profile (online now)

a1Jim

112814 posts in 2321 days


#4 posted 07-22-2010 09:50 PM

Great Idea Russ super jig

-- http://artisticwoodstudio.com Custom furniture

View Kent Shepherd's profile

Kent Shepherd

2698 posts in 2030 days


#5 posted 07-22-2010 10:22 PM

Awesome Russ

Looks like a winner

-- She thought I hung the moon--now she just thinks I did it wrong

View rdjack21's profile

rdjack21

265 posts in 1672 days


#6 posted 07-23-2010 01:39 AM

Really nice jig. It reminds me of another similar jig I saw here http://woodgears.ca/box_joint/jig.html that I’ve been thinking about making. Yours is considerably simpler though so I may make it instead.

-- --- Richard Jackson

View rmac's profile

rmac

187 posts in 1804 days


#7 posted 07-23-2010 03:17 AM

rdjack21,

Yes. The jig I got my idea from was made by the same guy (Matthias Wandel) who built the really fancy one that you saw. That guy is a real genius.

—Russ

-- My table saw laughs at hot dogs. http://thesorteddetails.blogspot.com/

View Jim Jakosh's profile

Jim Jakosh

12319 posts in 1850 days


#8 posted 07-23-2010 05:17 AM

Nice idea to incorporate into a sled for super accuracy. Thanks for sharing!!

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View michelletwo's profile

michelletwo

2289 posts in 1760 days


#9 posted 07-23-2010 11:09 AM

MOVE OVER INCRA!!!! Russ, very clever.

-- We call the destruction of replaceable human made items vandalism, while the destruction of irreplaceable natural resources is called development.

View stefang's profile

stefang

13623 posts in 2078 days


#10 posted 07-23-2010 05:34 PM

Good jig Russ.

-- Mike, an American living in Norway.

View Paul2274's profile

Paul2274

327 posts in 1857 days


#11 posted 07-24-2010 03:40 AM

I like your jig.

Somehow from one man to another that just doesn’t sound right…... but what the heck….. I like your jig!

Paul

View Bricofleur's profile

Bricofleur

1194 posts in 1937 days


#12 posted 07-24-2010 06:28 PM

Fully adjustable ! I like it too. Thanks for posting.

Best,

Serge

http://atelierdubricoleur.spaces.live.com

-- Learn from yesterday, work today and enjoy success tomorrow. -- http://atelierdubricoleur.wordpress.com

View lou's profile

lou

340 posts in 2187 days


#13 posted 07-25-2010 01:32 PM

great idea.i would like to make a copy if you dont mind.super job.

View rmac's profile

rmac

187 posts in 1804 days


#14 posted 07-25-2010 05:02 PM

lou: Copy away!

everyone else: Thanks for all the compliements, but credit for the idea really belongs to Matthias.

—Russ

-- My table saw laughs at hot dogs. http://thesorteddetails.blogspot.com/

View David's profile

David

177 posts in 2459 days


#15 posted 07-28-2010 07:03 PM

I got to thinking about using standard threaded rod for “lead screws” and the distance of travel per revolution (and partial revolution) of the rod (or nut). I made up a spread sheet for some of the standard pitches (number of threads per inch) and then if a divider head (disc) was fastened to the end of the rod for even increments of partial turns: what the travel distance would be. Example: If a standard ¼ – 20 screw was used: (20 threads per inch) then one turn would move the nut 1/20 inch or .050 inch. So for a half turn it would move .025, one third turn it would move .0166, and so on. Granted one will not maintain 4 decimal place accuracy due to the thread precision (or lack of) and backlash between the nut and rod threads. Here’s my chart if you want it ~ it’s in pic format so I could store it to share. http://picasaweb.google.com/Islandwoodworker/OddsAndEnds#5498996975538082850

Now if we can get someone to draw up and post divider heads (circles with even increments)
Let me know if I have any errors and I’ll correct them; I did a random check on the calculations.

-- Islandwoodworker@Gmail.com

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