woodbrains
Established Member
custard":7c9g9zmt said:Moonsafari69":7c9g9zmt said:assume a board-end jig would be sized to screw into the end grain?
Yes, screwed or attached with a brad, it's on end grain that the jig is most likely to rock about so benefits most from being secured.
For a mid panel T-joint would you use the same design or make one up a with a fence like a T-square?
Could be either, in many cases you'd have a pencil line referenced from a true edge to align the jig to
Now this may be a dumb question but here goes, should the hole and dowel size match and be the same diameter or should the dowel be slightly smaller to allow for the glue up?
Dave.
That's a really astute question, I believe Krenov used "lettered drills" the specialist engineering drills which are available in sizes a few thou either side of a standard size, and he sometimes used a minutely larger drill in the end grain side of the joint. However, save all that fancy stuff until later in your woodworking career, keep it simple and use a good quality 8mm drill for both sides of the joint along with a good quality 8mm dowel.
Hello,
Krenov actually ground his own drills at one time, something akin to a modern split point drill. Perhaps at the time he could not get good quality lip and spur drills. I know number and letter drills were available at the College of the Redwoods, where he taught, but I suspect when better quality lip and spur drills became available and fluted dowels, which are slightly undersize but expand when water in glue is applied, he used those. He would drill end grain on a horizontal drill, to help with registration, but I'm not sure about using an oversize drill. I should have thought, if he would make any change to drill size for end grain, it would have been undersize, though, as holes in end grain tend to become enlarged. In any case, the College teach dowel resizing to make sure they fit the holes you drill, so the point is moot.
Mike.