Tricks of the Trade 



Attachments for Using a Vise as a Punch Press 



A way to use an ordinary vise for making 

 light duplicate parts from thin sheet metal 



SMALL duplicate articles are ordina- 

 rily made in punch presses, but for 

 the home workshop or a small job- 

 bing shop such a press is too expensive. 

 Ordinary punching or forming in 3/16-in. 

 sheet metal may be handled in a vise with 

 the power of the screw, by attaching the 



5PR1NG 

 DIE 



STRIPPER PLATE 

 GUIDE PIN 



DRIVING 

 PLATE 



PUNCH 



FIG.l. 



ASSEMBLY (5IDE ELEVATION) 



The two parts attached to the vise jaws 

 for holding the die and punch in Une 



specially constructed parts to the jaws as 

 shown in the illustrations. With this 

 device many small things can be turned 

 out as rapidly and accurately as if made 

 in a regular die press. The parts assem- 

 bled are shown in Fig. 1. 



The base. Fig. 2, is attached to the fixed 

 jaw of the vise by the upper and lower 

 clips A and B, Fig. 1. These clips keep 

 the base from pulling away from the vise 

 jaw when the punch is pulled from the 

 die. These clips are attached to the vise 

 jaw with round head K-in. machine 

 screws. 



In Fig. 2 is shown four K-in. tapped 

 holes for guide pins, Fig. 3, two of which 

 are plainly shown in place in Fig. 1. To 

 assist in returning the punch after the 

 operation, four helical springs, shown in 

 Fig. 4, are slipped over the four pins. 



The driving plate. Fig. 5, in general 

 dimensions is a counterpart of the base. 

 There are four holes drilled and reamed 

 carefully to size for the ends of the guide 

 pins. It is very necessary to make the 

 base and drive plate accurately so that 

 the parts will come together in line. 



The stripper plate, Fig. 6, consists of 

 two parts, the plate and its base block. 

 The base block is merely a piece of metal 

 cut to the size given, which supports the 

 stripper far enough from the face of the 

 die to permit the stock to be inserted for 

 piercing. 



The dimensions of the clips for holding 

 the base and driving plate are given in 

 the details of Fig. 5. Three punches and 

 dies are shown in Fig. 8, 9 and 10, the 

 simplest form being shown in Fig. 8. 

 For ordinary punching, the punch face 

 or end must be flat and have a clearance, 

 as shown. Clearance is a slight taper 

 from the cutting edge to the tank. The 

 proper amount of this taper is 1/64 in. to 

 each 1 in. in length. At the junction of 

 the punch and the shank a heavy fillet 

 should be formed as shown. Never make 

 a punch with a square shoulder at this 

 point. 



5TAP- ^' COUNTERBORE 



■^ REAM=PU5H-FiT f OR 



WIND ON -g MANDRE.I, 



hil \\hiH l-? + zH ^i'TAPFOR f-|"H GUIDE PiNS. l-J- 



J_l \ \ 'y^i STRIPPER 1 y'x^ I, 



rff: 



: DRILL- 



../t 



1,Tj- fCOUNTERBORE, p^^ 



MACM, ST. 

 ■f ALL OVER 



^ 



H §"REAM Vl- 



m 



iTAP 



i4aisG. - spring; sVeel 



PUNCH RETURN 5PRING 



riG.4. 



I3THD5'PER1N.-US 5 



IREQ. 

 ,MACM.5T. 

 'fAUUOVER. 



base: 

 riG.z. 



' IcduNTERBORE 

 DRIVING PLATE. ^rfo 



•j ALL OVER- mAChItEEL 



FIG. 5. 



GUIDE P1N5. 

 FIG. 3. 



Dimensions of the various parts used in constructing the holders for the dies and the 

 punches to attach to the jaws of an ordinary bench vise for making small duplicate parts 



453 



