Jet AB-1012W Operating Instructions And Parts Manual

Contents

Jet AB-1012W Operating Instructions And Parts Manual Manual pdf 20 page image

20Figure 31If you do not have a piece of 2-inch bar stockavailable for a test cut, use a larger diameter testpiece rather than a smaller one. The maximumthickness variation on any test piece should be nomore than 0.003 inch, per side, per inch of stockdiameter.13.8 Blade SelectionThe band saw is provided with a 1” wide x 0.035”thick x 138” long saw blade that is adequate for avariety of cut-off jobs on many common materials.Refer to a machinists’ handbook for the speedsrecommended for various materials.A coarse blade could be used for a solid steel barbut a finer tooth blade would be used on a thin-walltube.In general, the blade choice is determined by thethickness of the material; the thinner the material,the finer the tooth pitch.A minimum of three teeth should be on theworkpiece at all times for proper cutting. The bladeand workpiece can be damaged if the teeth are sofar apart that they straddle the workpiece.For very high production on cutting of specialmaterials, or hard-to-cut materials such asstainless steel, tool steel, or titanium, you can askyour industrial distributor for more specific bladerecommendations. Also, the supplier who providesthe workpiece material should be prepared toprovide you with specific instructions regarding thebest blade (and coolant or cutting fluid, if needed)for the material and shape supplied.13.9 Blade Break-In ProcedureNew blades are very sharp and therefore have atooth geometry which is easily damaged if a carefulbreak-in procedure is not followed. Also, breaking-in will lengthen the service life of the blade andproduce optimum efficiency.Consult the blade manufacturer’s literature forbreak-in of specific blades on specific materials.The following general procedure should beadequate for break-in of JET-supplied blades onlower alloy ferrous materials.1. Follow the usual clamping and operatingmethods shown in this manual, with theexception of the following:2. Reduce the blade speed to half of its normalspeed.3. Lengthen the bow downfeed rate to 2 to 3times that of normal.4. Listen for any unusual or metallic sounds fromthe blade. If these occur, repeat the cut. (Aminimum of 5 complete cuts of an 8” diameterworkpiece is a good standard by which toperform this.) Also, watch the chip formationuntil cutting is at its most efficient rate (see“Evaluating Cutting Efficiency”).When breaking-in is complete, return the settingsto their normal levels.