METAL BODY REPAIR - OD1653 - LESSON 1/TASK 1
(e) Slip Lock Extension (F) (figure 9 on the previous page). This tool
gives six inches of prompt adjustment in pushing out large areas. A double
friction lock holds securely at desired lengths, and is adjusted by a
convenient double trigger release.
(f) Rocker Spoon (G) (figure 9). Specially designed for body work, it
is held and locked in place by a hexagon pin. It may be set in many
different positions. The selection of the spoon position is governed by the
curvature of the body, the body bend or dent, and amount of working space.
(g) Spreading Wedge (H). This tool is used for forcing out large or
small concave areas and can be closed to one inch and opened to three
b. Electric Disk Sander. The disk sander may be used to remove paint,
reveal low spots, shape the contours of areas built up with solder, sand
down welds, remove excess solder, remove rust, and remove deep scratches by
using a fine abrasive sanding disk. It may be equipped with a flexible
grinding wheel to serve as a grinder on thick sections of metal.
(1) Backing Plate. In most grinding, the disk is placed directly on the
slightly flexible backing plate. Hard rubber and plastic can be used as
backing plates. If a 9 inch sanding disk is used, it should have a 7 inch
backing plate. The 7 inch backing plate will allow the 9 inch sanding disk
outer edge to be cut down when it has become worn, increasing the disk life.
Sanding disks are secured in place by a flat plate nut that is screwed onto
the motor drive shaft and permits easy installation and removal of the plate
nut when changing torn or wornout disks.
(2) Sanding Disks.
(a) The coating abrasive disk does the cutting. Selection of the
right grit and coating for each job is important.
1 Five different minerals are commonly used for manufacturing
abrasives. Three of these, garnet, flint, and emery, are natural mineral
abrasives. The other two are aluminum oxide and silicon carbide.