Blade Grinding; Secondary Annealing; Welder Clean-Up - Jet VBS-2012 Operating Instructions And Parts Manual

not break or crack after forming the radius. If
the weld breaks, cut away welded area and
repeat welding-annealing process.
6. Check to make sure welded section is same
thickness as rest of blade. If not, grind off
excess weld material using the grinder. Refer
to section 12.5, Blade grinding.
If blade is thicker at the weld
than at the rest of the blade, using the blade
may damage the guides.
The following are variations of the general
procedure, based upon blade type:
12.4.1 Carbon steel blades
1. Press and jog the annealing switch button until
weld is a "dull cherry" to "cherry red" color.
2. Allow blade to cool slowly by decreasing
jogging frequency.
12.4.2 Carbon steel hard back blades
1. Heat blade slowly until weld becomes a deep
blue color.
2. Continue to heat by jogging the anneal button
until the width of the blue color is one-half the
length of the band exposed between the jaws.
3. Do not overheat or the temper of the band will
be damaged. Caution - Do not heat beyond
the "blue" stage. If the band begins to show
any red color, it is too hot. Cool quickly by
releasing the anneal button.
Figure 17
12.4.3 Bi-Metal blades
1. Heat blade slowly by jogging the annealing
switch button until weld just begins to emit light
(dull red color). The desired color may not
always be visible in normal room light - always
shade the weld area with your hand.
2. Cool the weld quickly by releasing the
annealing button.
3. Follow this procedure before and after grinding
bimetal blades.

12.5 Blade grinding

rotating grinding wheel. Failure to comply may
cause serious injury. Always heed the indicator
light – when glowing, it warns that the grinder
motor is running.
After annealing, the blade must be ground to
remove excess metal or flash from the weld. With
the teeth facing out, grind the weld carefully (Figure
18). Do not hit the teeth, or grind deeper than the
weld, burn, or overheat the weld area. Be sure to
remove flash from back edge of blade. Any flash or
"stub" teeth which project beyond the normal set or
height of the other teeth must be ground off.
Figure 19 illustrates some unacceptable grindings.

12.6 Secondary Annealing

Anneal the weld 2 to 3 times again after grinding.

12.7 Welder Clean-Up

It is important that the welder jaws be kept clean at
all times. The jaws and inserts must be wiped or
scraped clean after every weld. Doing this will
ensure better welds by:
1. Holding proper alignment.
14
Keep hands away
Figure 18
Figure 19
from