. The universal assistant, and complete mechanic : containing over one million industrial facts, calculations, receipts, processes, trade secrets, rules, business forms, legal items, etc., in every occupation, from the household to the manufactory. Fig. 29. Front tool for brass work. Fig. 30. Tool for cutting sqnAre threads. Fig. 31. Tool for cutting hard metal. Tig. 32. Boring tool for brass. Fig. 33. Tool for fiuishing cast iron, wrought iron »nd >tML Fig 3i Die for Bcrew-cutting, fftM Tiew, yi(. So. Spiral drili 474 MACHINISTS, engineers, AC, KECEIPTS, off the back parts of the teeth, gi
. The universal assistant, and complete mechanic : containing over one million industrial facts, calculations, receipts, processes, trade secrets, rules, business forms, legal items, etc., in every occupation, from the household to the manufactory. Fig. 29. Front tool for brass work. Fig. 30. Tool for cutting sqnAre threads. Fig. 31. Tool for cutting hard metal. Tig. 32. Boring tool for brass. Fig. 33. Tool for fiuishing cast iron, wrought iron »nd >tML Fig 3i Die for Bcrew-cutting, fftM Tiew, yi(. So. Spiral drili 474 MACHINISTS, engineers, AC, KECEIPTS, off the back parts of the teeth, giving them 1| the breadtli of thei»pitcli, leavir^ them, if the pitch is 10, a lOth and a 20th, wuich le;iveathem quite strong enough lor efficient sendee and e;isy worii. Triiuthe back parts of the teeth with a plauhig tool ^ual In tliicknes tothe size of the tap. Two taps ehomd oe used for each tlueaJ: \Mtiihie first, remove two-thirds of the thread, and finish oil with t,ieotiier. Ko taer is pre<juired on taps for 5 threads ; if they are fabri-cated by this plan, they are not liable to break, and work large mongrel-thread taps should iuvaiiabiy be of two or luuregizes, owing to tJie coarse thread and the mass of nietai to
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Keywords: ., bookcentury1800, bookdecade1870, booksubje, booksubjecttechnology
