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Drill indexing jig (cribbage board)

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Project by Gianni posted 10-16-2014 02:46 AM 2479 views 2 times favorited 6 comments Add to Favorites Watch
Drill indexing jig (cribbage board)
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As hard as we try to raise our kids right and steer them onto the straight and narrow, the inevitable finally happened and my daughter fell into the wrong crowd: cribbage players. After hanging out with these hooligans for a few years, she’s begun an attempt to pull me into this shady underworld. She’s asked if I can make her a cribbage board. That’s how it starts, and before you know it you’re at a friends house borrowing his cnc metal lathe to spin down your own pegs.

It seemed to me the biggest problem with building a cribbage board was indexing the drill. A fifty dollar template didn’t seem like the right answer either, so this is what I came up with. It’s very similar to my box joint jig – just a box in a box with a 3’ threaded rod run through all 4 sides. There is a nut epoxied into one side of the inside box, and I just used double nuts and washers on the outside edges to hold it with respect to the outside frame. 16tpi rod gives me a quarter inch spacing with 4 cranks, and 1/2 in between the runs with 8 cranks. Those were the counts I used for the test piece. To get the second row I just put a shim against the indexing strip and dialed it back to the start.

I thought I would add toggles to hold it in place, but just holding itagainst the stops with my left hand while cranking and drilling with my right worked just fine. The only irregularities were due to the crappiness of my press and the hard maple making the bit wander. The “extra” hole, well, let’s just say there’s some danger in repetitive motion exercises.





6 comments so far

View Ken90712's profile

Ken90712

17472 posts in 2971 days


#1 posted 10-16-2014 08:32 AM

Nice set up and cute story, I like it.

-- Ken, "Everyday above ground is a good day!"

View Richard's profile

Richard

1912 posts in 2473 days


#2 posted 10-16-2014 07:03 PM

My Grandfather was a hooligan . Nice idea for th jig.

View Northwest29's profile

Northwest29

1601 posts in 2272 days


#3 posted 10-16-2014 09:05 PM

What a great idea! I may just have to steal that idea and make one for my jig collection. I know a few players that could use a new board. (-:

-- Ron, Eugene, OR, "Curiosity is a terrible thing to waste."

View Mahini's profile

Mahini

20 posts in 1125 days


#4 posted 10-27-2014 08:42 PM

Started learning English as a kid. Yet I sometimes do get into problems. Got yhe first paragraph okay. but not what the project is meant to be. Gotta look out for ” cribbage” , “and indexing the drill” on the net !!!

View Gianni's profile

Gianni

232 posts in 1756 days


#5 posted 10-28-2014 02:45 AM

Mahini, cribbage is a card game. The players keep score on a board by moving pegs along two rows of 30 holes each. The holes are lined up in tracks, so any error in drilling them is extremely obvious.

“Indexing” just means positioning the drill bit in the correct place to drill the next hole. It requires keeping the board and tracks perfectly straight and the holes evenly spaced.

View helluvawreck's profile

helluvawreck

28227 posts in 2649 days


#6 posted 05-09-2017 02:01 PM

This is a very nice jig and will be a wonderful addition to your shop.

helluvawreck aka Charles
http://woodworkingexpo.wordpress.com

-- If a man does not keep pace with his companions, perhaps it is because he hears a different drummer. Let him step to the music which he hears, however measured or far away. Henry David Thoreau

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