Discussion on "Press tools" at the London Section of the Institution

MR. H. LB CHEMINANT : One must agree that in every press proposition, 25% is statistical, 50% experience and 25% luck, or, as others would term it, intuition. Regarding transformer laminations, I agree with the author that it is not easy to obtain large outputs without frequent regrinding of the dies, but, in my experience, although one hears of runs of 200,000 with 50,000 to 70,000 as an average, if we obtained 30,000 we thought we were doing exceptionally well, and this was only found possible by putting the laminations through a rolling machine to reduce the burrs.