Share |

Lesson 5: HARROW GAUGE or SCRIBER

A

 

Before forming the eye, the acute bend at the root of the loop must be strengthened by adding extra metal in the form of a small wedge, made from 3/8" round bar, welded into the rod.

At a BRIGHT RED heat, the wedge is first drawn to a chisel point so-

B

 

Next a dent must be made each side of the wedge to prevent it falling out while being welded, so at a NEAR WELDING heat, place the wedge end on the corner of the anvil

and strike it with the hammer like this-

C


 

Lay the wedge end on the anvil table and cut off about ½" with a hot chisel.

D


Mark the 3/8" rod with a centre punch 5½" from the end.

Take a NEAR WELDING heat and bend at this mark to a hairpin shape.

Force in the wedge and close the hairpin to grip it tightly.

E


Clean the fire and take a FULL WELDING heat.

Hold the bar with the short leg of the hairpin standing up thus-

Weld in the wedge with moderate blows delivered at the angle shown.

Turn the hairpin flat and hammer in the sides.

F


Use a small hot chisel with a curved cutting edge to trim away the surplus metal leaving a neatly radiused corner.

This is much stronger than a rough and ragged edge as, with a smooth flowing curve, there is nothing to start a crack.

G


Take another heat on the short end and start to bend in over the bick

like this-

then turn it over as in Lesson 4 C to close the eye to the shape as shown in the next illustration, H.

H


 

Here is the eye completed-

J


 

Flatten the end as shown in the drawing.

K


To complete the scriber, heat the other end, bend it to the dimensions given,

like this-

And then cut off to match the point as shown in the drawing.