Brief Description: DAU Cable Harness Firewall Penetration
We installed a 1" firewall penetration. What should have been a simple job took too long.
I needed a 1" hole. I have just the tool for that - a screw tension dia in 1". I drilled a 3/4" pilot hole for the mechanism. I inserted the tool and die and started rachetting it down. Somehow the punch started to walk, making an elongated hole. More aggravating was that the tool got stuck 90% of the way through the cut. I had to pry it out, makeing a further mess of the hole.
Reworking the hole to get something that was without stress risers took a whil.
Finally we drilled the four mounting holes, applied fire seal to both surfaces and fastened it down.