Post by Tom on Aug 6, 2013 10:30:33 GMT -5
Hi RTH, This is a simple but effective device to mark the girdle on cabs before grinding begins. This was made by an old gentleman at our club and has been around for years and years (like 40).
Works really well, have fun.
Tom
Materials needed:
3 inches of 2x2 wood
5 inch by 3 inch 3/4 in G1S plywood (better with arborite glued to it but not essential)(old piece of counter top)
1/4 inch nut
1/4 by 1 1/2 bolt
Wood glue
Substitute materials for items you have handy, it does not have to be exactly like this one.
Tools:
Drill and drill bits.
small wood chisel
small clamp.
Measuring tape or a good eye.
small square or a good eye.
NOTE: if you look at the pictures you will see holes not drilled straight, this guy should have used tools and not his "good eye" LOL. The device works fine it just does not look as professional as I would like. (I am being too anal I know)
View from the side, glue and clamp 2x2 to the plywood base as shown and let dry.
At about a 45 degree angle in the center of the 2x2 drill a hole the size of your aluminum/brass rod or bigger.
Next drill a straight (not like in the picture LOL) 5/16 inch hole down the center of the 2x2 until it intersects with the 45 degree angle hole.
screw the nut on the bolt and insert in the hole, get the nut flush with the 2x2. Then make a pencil mark around the outside of the nut.
Remove the bolt and gently using the wood chisel cut out a hole for the nut to that it sits flush inside the 2x2.
Glue the nut into this hole so its secure, try not to get glue in the threads but if you do they can be cleaned with a tap.
NOTE. take your time lining up the holes so they are straight, not like the example I took pics of:)
You are now done:) Insert rod into hole and adjust the point to the spot on your cab you want the girdle to be. Lightly tighten the nut to secure the rod. Rotate the cab around while gently pushing on the tip of the sharpened rod and you will end up with a perfect girdle line. Don't worry if you don't have a fancy bolt like the one in the picture, a normal hex head bolt will work fine, it takes very little pressure to hold the rod in place.
Easily adjusts for cabs of varying thickness or doing double domed cabs.
Works really well, have fun.
Tom
Materials needed:
3 inches of 2x2 wood
5 inch by 3 inch 3/4 in G1S plywood (better with arborite glued to it but not essential)(old piece of counter top)
1/4 inch nut
1/4 by 1 1/2 bolt
Wood glue
Substitute materials for items you have handy, it does not have to be exactly like this one.
Tools:
Drill and drill bits.
small wood chisel
small clamp.
Measuring tape or a good eye.
small square or a good eye.
NOTE: if you look at the pictures you will see holes not drilled straight, this guy should have used tools and not his "good eye" LOL. The device works fine it just does not look as professional as I would like. (I am being too anal I know)
View from the side, glue and clamp 2x2 to the plywood base as shown and let dry.
At about a 45 degree angle in the center of the 2x2 drill a hole the size of your aluminum/brass rod or bigger.
Next drill a straight (not like in the picture LOL) 5/16 inch hole down the center of the 2x2 until it intersects with the 45 degree angle hole.
screw the nut on the bolt and insert in the hole, get the nut flush with the 2x2. Then make a pencil mark around the outside of the nut.
Remove the bolt and gently using the wood chisel cut out a hole for the nut to that it sits flush inside the 2x2.
Glue the nut into this hole so its secure, try not to get glue in the threads but if you do they can be cleaned with a tap.
NOTE. take your time lining up the holes so they are straight, not like the example I took pics of:)
You are now done:) Insert rod into hole and adjust the point to the spot on your cab you want the girdle to be. Lightly tighten the nut to secure the rod. Rotate the cab around while gently pushing on the tip of the sharpened rod and you will end up with a perfect girdle line. Don't worry if you don't have a fancy bolt like the one in the picture, a normal hex head bolt will work fine, it takes very little pressure to hold the rod in place.
Easily adjusts for cabs of varying thickness or doing double domed cabs.