PVC Trombone

Step 2 Making the bending jig

First you'll have to make a jig for bending nice curves in your tubes.
Start with a sheet of plywood on which you draw a line in the middle so you can line it all out.
Then take the hole saw an make the "puck". Best thing with these is to start at one and in the wood and before you are trough it turn it over and drill from the other side. this way you won't splinter the edges of the wood.

Next you put a bolt into the hole in the middle of the "puck" and put it into a drill very tight so it won't turn. fasten a round file in your vice and slowly push the circle against the file. So you'll end up with a convex side of the "puck" in which the tube will fit. (of course you could do this without the drill but hey..I've more instructables to make!).

Drill a hole on the line in the plywood and attach the circle to it. Then take a piece of 3/4" tube put it against the circle and take a piece of lumber and put it on the other side so it fit snuggly. Mark the place and drill the two holes to attach the woodblock with bolds and nuts. Do the same with a piece of 5/8" tube. Make sure to line the block in a 90 degree angle with the pencil line so it will be easier to see if the tube is bend enough.
Attach the woodblock to the board.


Well this was the hardest part of this instructable so from now on it's only getting easier ;)

Comments

[cheesehead246]

you need to put the size of the plywood