I am making my horizontal stabs. It has vertical holes for the brace wires. How to get the position of the spring punch dents and ensure
the are exactly straight up in y and x direction.
first with the horizontal in the jig on the table---- paint the tubing with dyechem. Take a long steel ruler and lay it across the leading and trailing tubes.
Turn the ruler up on edge- and drag it across the dychem-ed areas. Allow the edge of the ruler to scrape away the dye. That establishes a line that represents
"straight up". Then determine where the mark should be up and down the tube per plans. That "finds" the hole in the upper side. Now-- how to find a matching hole in the other side so that the bushing that gets welded in will be perfectly vertical. ?
Found a cpvc end cap that perfectly fits over the tubing. Cut the end out on the lathe. Then cit the ends to be perfectly square.
Then cut a slot down the side all the way through. That allows the ID to expand slightly. Slip that over your tube.
Slide it down the tube till its edge is even with the punched first spring punched mark. The plastic ring will flex open to allow it to move freely.
When you get it even with the first punched hole - put a hose clamp over the ring to secure it. Then take a sharp knife -- scratch around the tube following the ring---- through the area where the other hole will be. Then --- remove the ring. Cut a paper strip that fits around the tube. Cut it so that the ends meet perfectly. Fold in two so ends meet---- then ink the fold. Wrap this around tube and use it as a ruler---- align the ink stripe on the paper with the first punch mark --- the mark where the tails meet on the other side. Mark that. Where this mark and the scratch meet is the position of the hole in the bottom side.
The two marks should exactly up and down in good alignment.
the are exactly straight up in y and x direction.
first with the horizontal in the jig on the table---- paint the tubing with dyechem. Take a long steel ruler and lay it across the leading and trailing tubes.
Turn the ruler up on edge- and drag it across the dychem-ed areas. Allow the edge of the ruler to scrape away the dye. That establishes a line that represents
"straight up". Then determine where the mark should be up and down the tube per plans. That "finds" the hole in the upper side. Now-- how to find a matching hole in the other side so that the bushing that gets welded in will be perfectly vertical. ?
Found a cpvc end cap that perfectly fits over the tubing. Cut the end out on the lathe. Then cit the ends to be perfectly square.
Then cut a slot down the side all the way through. That allows the ID to expand slightly. Slip that over your tube.
Slide it down the tube till its edge is even with the punched first spring punched mark. The plastic ring will flex open to allow it to move freely.
When you get it even with the first punched hole - put a hose clamp over the ring to secure it. Then take a sharp knife -- scratch around the tube following the ring---- through the area where the other hole will be. Then --- remove the ring. Cut a paper strip that fits around the tube. Cut it so that the ends meet perfectly. Fold in two so ends meet---- then ink the fold. Wrap this around tube and use it as a ruler---- align the ink stripe on the paper with the first punch mark --- the mark where the tails meet on the other side. Mark that. Where this mark and the scratch meet is the position of the hole in the bottom side.
The two marks should exactly up and down in good alignment.