The new tinsmith's helper and pattern book; a textbook and working guide for the ambitious apprentice, busy mechanic or trade school student by Williams Hall V

Author:Williams, Hall V
Language: eng
Format: epub
Tags: Tinsmithing
Publisher: New York, U.P.C. book company
Published: 1917-03-25T05:00:00+00:00

^^S^m^^^^ E2ZS222^J^^^SSSSS5 €88^^l

Fig. 172. A Riveted Fig. 173. Flush Riveted Fig. 174. Soldere-Lap Seam for Plate. Lap Seam. I^p Seam.

thoroughly sweated in, because the rivets, rathe x than the solder, are depended on to hold the seam.

Lock and Groove Seams

Some clever genius invented the hook seam shown in Fig. 176 and thereby gave the trade a decidedly useful method of joining sheet metal. This lock seam, as some call it, is merely the turning of edges the opposite way for opposing sides to be joined and then hooking them together and flattening them tight with a mallet like in tin-roofing. These seams can be soldered; however, if positive assurance

(

I

SEAMS, JOINTS AND PROCESSES 193

against unhooking is required, these seams should l>e grooved as in Fig. 177. The shoulder at A prevents B from slipping out.

There are many methods for making this groove

—-qther by pounding the seam into a slot cut in

^ rail, or by grooving irons; or again, by grooving

^Tiachines having a traveling revolving wheel with

^ groove in it. From the hook seam it is but a

^tep to the standing seam shown in Fig. 178, which

^^n be employed in a number of cases.

^

_JL

*^ic. 175. Rivet Fig. 176. Com- Fig. 177. Groove Fig. 178. Corned Lap Seams mon Lock Seam for mon Standing for Sheet Seam for Sheet Metal. Seam for Metal. Sheet Metal. Sheet Metal.

Double and Flange Seams

The seams and methods expounded in the foregoing pages are really the fundamentals of all Yearns. If a bottom was to be seamed i at M to the article shown in Figs. 168 and 169, a little different procedure would be necessary. In the case of Fig. 169, the hooks, flanges, etc., are similar, but the edge is curved and would require a modification of the flat seam method.

Fig. 179 shows how a bottom would be joined to the body in plate work. Fig. 180 being a reverse joint of the same. In the case of Fig. 168 the flanges (A) would be bent up in machines like a brake, but in the case of Fig. 169 the turned up edge would be done by what is termed flangeing. There are machines which do this work with pre-

THE NEW TINSMITH'S HELPER

cision, but more often a mechanic would be quired to draw up the flange by hammering; operation that requires the highest order of s\ The joints shown are the basis of many others, si as joining the branch to the pipe in a tee joint.

Jnsiefeof

^v^JC^JV^^^^^^^^

\ \ k-Bocfy

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.