Here are a couple of photos of some scrap .032 that has been dimpled, with the hole on the left slightly under-dimpled, and the hole on the right fully dimpled. The fully dimpled hole has sharper shoulders and the witness mark from the flat surface of the die around the hole is complete.
C-frame will give as good a dimple as anything if it is sitting on a firm surface... and hit as hard as you like.
The worst screw up of a dimple is a figure 8 hole if the die is not centred on the hole.
Paul vS (yes I'm also a Van)
Building RV-6A #22320 O-320 FP. Wings and tail complete, working on fuselage
Flying my Aeroprakt A-22 STOL and the aero club's RV-9A while I build
Last edited by PaulvS : 08-19-2021 at 12:29 AM.