General discussion > Shop Made Tools
Rifling Worm Blank Jig
Steve Bookout:
Here is a jig that actually came to me in dream last night. :o There have been a few concerns over the years about the jig used to drill the rifling rod mounting hole as depicted in our little book about making a wooden rifling bench. In the book, there's a photo of a scrap of wood that is held against the end of the worm, a.k.a. tail stock. The piece of wood has a hole in it to allow passage of the drill bit into the tail stock at a fairly straight shot. This concept has been improved upon rather dramatically and since a picture (four of them to be exact) is worth a thousand words, here they are:
Here a 1 5/8" hole has been bored into a piece of thick wood to a depth of 1". The 1 5/8" hole is the book's given diameter of the worm's tail stock. The wood is then removed from the resultant cavity.
Next the pilot hole is drilled completely through the block. The block was backed up with a board to keep the edges of the hole from splitting out.
The hole was then enlarged to accept the drill bit diameter of your choice to drill the rifling rod hole into the tail stock.
In use, the tail stock is inserted into block. The fit should be close and free from any wobble, but not really snug nor loose. The hole is then drilled into the tail stock. Notice the drill bit at the top of the photo? If your drill bit is not long enough to go as deep as you wish, remove the block and drill carefully until the desired depth is attained. Clear as mud?
Cheers, Bookie
runastav:
Bookie, did I show you my drilljig made of brass?
Runar
Steve Bookout:
Hei Runar! Your jig looks really nice, Runar. I wish I had your machinist skills & machinery. Where did you find that big piece of brass? mvh Bookie
runastav:
Takk Bookie, I often drop in the local junk dealer for chip metalscrap :)
Mvh
Runar
Steve Bookout:
Hei Runar. Perhaps the wife and I should take a cruise from Norge og visit you, too. Mvh Bookie
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