(27) Rivet Set

Used for setting down the metal after the rivet has been placed in position. At the side of the hole there is a hollow cup for rounding up the tail of the rivet after it has been hammered over.

(28) Groover or Seam Set for setting down seams or folds in sheet metal.

(29) An Engineer's Surface Plate

Used for testing and setting out. Must be kept covered. Usually of cast iron and planed up in a planing machine. Only the most expensive ones are hand scraped. Made in various sizes.

(30) Fletcher Russell Foot-bellows for blowpipe work; very useful for small work and does not take up much room. Made in different sizes.

(31) Gas Blowpipe

Used for brazing and silver-soldering and connected with the foot-bellows (30) by india-rubber tube. Known by the size of the outside tube it is made of. The one illustrated is a 3/4 in. blowpipe with lever-valve gas control.

(32) Brazing Pan

Made of sheet and bar iron riveted together. Filled with coke, fireclay, asbestos, charcoal, or pumice stone, and used for brazing, silver-soldering, etc. A handy size is one about 18 x 24 in. and about 2 ft. 6 in. high to the top edge. The small trays at the side are for spelter and borax.

The tools illustrated in Fig. 22 are mostly lathe tools as follows:-

(1) Straight-fluted Drill with parallel shank.

(2) Morse-twist Drill with parallel shank.

(3) Rose Countersink with taper square shank. This is only suitable for soft metals unless rehardened.

(4) Slocombe Drill and Countersink combined. The angle of the countersink is the average .angle used for the centres of lathes. This is used largely for the pieces of work that are to be turned in the lathe, as it drills and countersinks the holes for the centres at one operation.

(5) Lathe Tools

Nos. (5-13) make a useful set for use in the slide rest, and they are usually made of carbon tool steel, and in different size material according to requirements. No. 5 is known as a Diamond-pointed Roughing-down tool or a hook tool.

Description of Fig. 22 {continued).

(6) Round-Nosed Roughing-Down Tool

If used on wrought iron or mild steel it cuts better if the right-hand corner marked A is ground down a bit lower than the front left-hand corner, about 1/16- 1/8 in lower. But it depends on the metal being cut.

(7) Right-Hand Side Tool

Used for squaring up or facing off shoulders, etc., on the right-hand side.

(8) Left-Hand Side Tool

Used for the same purpose as (7), only opposite hand.

(9) Vee Threading Tool for cutting exterior threads with the automatic slide rest in action.

(10) Square Threading Tool for cutting exterior square threads with the automatic slide rest in action. Could also be used for a cutting-off tool. It is also easier to forge the nose at one side of the tool, instead of the centre as drawn. Simply a matter of taste.

(11) Inside Boring Tool for roughing out. Used mostly for shallow holes or rings.

(12) Inside Boring Tool for finishing cuts.

(13) Inside Vee Threading Tool for use with the automatic slide rest in action. The same kind of tool only with a square end instead of a vee is used for cutting inside square threads.

(14, 15, 16, 17) Tools used for turning brass. They have no top rake, and have cutting angles of about 700 to 900. (14) Is known as a Ripper, used for roughing down; (15) is a Planisher, used for smoothing or finishing; (16) is a Round-nosed Planisher; (17) is a Right-hand Side Tool or an offset tool, used for squaring up shoulders, ends, and inside work.