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Daves Web Site
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Date: 11-17-2008
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Number of Hours: 2.00
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Manual Reference:
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Brief Description: Dimpled Rudder Parts
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Didn't spend much time in the shop today. Was going to dimple the rudder parts and get them ready to prime but ran into a problem trying to dimple the narrow end of the rudder tip rib. In the 1st picture below you can see how narrow one end of the rib channel is (less than an inch). I couldn't get any of the usual tools into the channel to dimple those holes. Tried the pop-river dimpler, the vise-grip dimpler and the screw/nut dimpler but nothing seemed to work. Read some other builder's logs and some recommended bending the flanges out, dimpling them and bending the flanges back. I didn't really want to do that. One builder took a C-clamp, ground off the clamp flange enough to place the pop-rivet dimple dies on either side of the rib flange, tightened the clamp and was able to dimple them that way. I tried that but when I tightened up the C-Clamp, the flange broke before it dimpled the hole deeply enough.
I finally thought of a different solution. I took a flat piece of steel, drilled a hole and countersunk a dimple the size of the female die at the end and secured the steel in the bench vise. I then took the rod out of the C-Frame dimpler and inserted the male die in the end, held the rib hole over the steel dimple, inserted the male die and struck the end of the rod with a mallet. Worked perfectly!
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The narrow end of the rudder tip rib (no, it isn't being held in the vise, only propped on it)
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The piece of steel with a countersunk hole the size of the female dimple die.
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The male die is on the end of the rod and is inserted into the hole to be dimpled.
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