Early 1900's Massive York Vault Door opened

[Doug MacQueen]

Thank Huw, yes drill deflection was a big concern. However after years of fantasizing about drilling the 4 foot thick Cleve Fed door, I was somewhat prepared mentally. We did start off with a Baby Bux, hence the orange support strap, but switched over to the lever rig at about 9" deep. The 5 very thick layers of 5 ply hardened chrome steel interspersed throughout the door laminates made for slow drilling. Never been to NEC, so we haven' t met before.