Tang Bolt Jig

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Making the Tang Bolt Jig: Drilling Tang Hole.JPG (256564 bytes)

Tang Jig Completed.jpg (43334 bytes)This works for those of you who have small drill presses like me. This is a short jig that allows you to center the drill bit and have sufficient room for both the drill bit and the gun.  With the drill bit in the chuck, lower the drill bit and then center the lower pin in alignment with the drill bit. Now you can drill a 1/8" hole from the top down to meet the pin below.  You drill half way down, flip the gun upside down and drill from the other direction.  Now change the bit over to a #29 for a #8 or a #21 for a #10 tang bolt and open up the hole more. The initial hole drilled serves as a pilot for your bit. Works great!!  

To make the lower jig, I purchased the following parts from the local hardware store. 

Hardware Parts.jpg (63257 bytes)

Quantity Description Specifics
1 Hex Head Bolt * 7/16"x3-1/2" -14 thd
1 Hex Nut 7/16" - 14 thd
1 Wing Nut 7/16" - 14 thd
2 Fender Washer 1/2" ID- 1-1/4" OD

* Make sure the bolt you get has at least 1-3/16" amount of threads. This will allow enough threads to pass thru the drill platform, the washer and the wing nut. Cut Off Bolt.jpg (27566 bytes)

Measure up from the threads 7/16" and draw a line. You will cut off the bolt here. 

Then you will find and mark the center of the bolt shaft diameter. With the center located, draw a 3/16" circle centered on the end of the bolt shaft. Tang Jig Circle 1.jpg (49468 bytes)


Tang Jig Diameter.jpg (57399 bytes)

This will be the initial diameter you will grind the bolt shaft down to. Place the bolt into a small vise to make it easier to handle the bolt during this process.  







Grinding Diameter.jpg (51756 bytes)All you want to do at this point is to remove the majority of material, almost to the threads.  


Filing Shaft Flat.jpg (42334 bytes)

Once this is done, then chuck the bolt into your drill press and using a 'safe' file. Work the file into the side of the bolt gradually to both square the shoulder near the threads and also reduce the diameter of the smaller shaft down to the 3/16" diameter.




Once you have reached the diameter, you can now file the point on the end of the bolt shaft. I used a bastard file to shape the point. The depth of the point was half the length of the shaft. Filing the Taper.jpg (52199 bytes)

I did not make a sharp point on the end, but rather left a small flat on the end.

Finished Shaft.JPG (243786 bytes)Next I threaded the 7/16" nut onto the threaded bolt all the way to end of the threads toward the point.  Place a washer onto the bolt and inserted the jig down into the hole in my drill platform. 

From the bottom, I placed another washer and then the wing nut onto the exposed threaded portion of the jig. 



Lower View Jig.jpg (77613 bytes)The fender washers cover the platform hole and yet the diameter of the bolt allows for movement and adjustment of the jig location to Drill Bit and Jig Aligned.jpg (66725 bytes)align with the drill bit.






Once the jig is located where you want it, you can use a crescent wrench to hold the top nut and allow tightening of the lower wing nut. 

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