1412.5 Blade grindingKeep hands away fromrotating grinding wheel. Failure to comply maycause serious injury. Always heed the indicatorlight – when glowing, it warns that the grindermotor is running.After annealing, the blade must be ground toremove excess metal or flash from the weld. Withthe teeth facing out, grind the weld carefully (Figure16). Do not hit the teeth, or grind deeper than theweld, burn, or overheat the weld area. Be sure toremove flash from back edge of blade. Any flash or"stub" teeth which project beyond the normal set orheight of the other teeth must be ground off.Figure 17 illustrates some unacceptable grindings.Figure 16Figure 1712.6 Secondary AnnealingAnneal the weld 2 to 3 times again after grinding.12.7 Welder Clean-UpIt is important that the welder jaws be kept clean atall times. The jaws and inserts must be wiped orscraped clean after every weld. Doing this willensure better welds by:1. Holding proper alignment.2. Preventing flash from becoming embedded inthe blade.3. Preventing shorts or poor electrical contact.13.0 Band saw operationConsult section 9.0 for identification of the controls.Unlock the control panel using the provided key.Never operate band sawwithout blade and wheel covers in place andsecured.13.1 Blade break-in procedureNew blades are very sharp and therefore have atooth geometry that is easily damaged if a carefulbreak-in procedure is not followed. Consult theblade manufacturer’s literature for break-in ofspecific blades on specific materials. The followingprocedure will be adequate, however, for break-inof JET-supplied blades on lower alloy ferrousmaterials.1. Use a section of round stock.2. Operate the saw at low speed. Start the cutwith a very light feed rate.3. When the saw has completed about 1/3 of thecut, increase the feed rate slightly and allowthe saw to complete the cut.4. Keep the feed rate at the same setting andbegin a second cut on the same or similarworkpiece.5. When the saw has completed about 1/3 of thecut, increase the feed rate while watching thechip formation until cutting is at its mostefficient rate (refer to “Evaluating CuttingEfficiency” below). Allow the saw to completethe cut.6. The blade is now considered ready for use.13.2 Setting blade speed1. Refer to Speed and Pitch chart in section 16.0.Select speed setting for the material to be cut.2. While machine is NOT running, move gearshift lever (B, Figure 2) to required speedsetting (high or low).Move gear shift lever onlywhen machine is NOT running, to preventdamage to gearbox.3. Start saw using the pushbutton.4. Turn speed setting handwheel (C, Figure 2) torequired speed. Turning handwheel clockwiseincreases speed; counterclockwise decreasesspeed.Rotate speed settinghandwheel only when machine is running.