Safety Demonstration On The Band Saw (1969)

[Music] the band saw is designed to cut curved in irregular shapes like the examples shown ordinarily it is not used for precise ripping or cross cutting operations as the name implies the cutting blade of a band saw is a continuous band of metal tightly drawn over a pair of Wheels the blade travels up by the back column over the upper wheel and down around the lower wheel causing the cutting for for to be down on the table guard should cover both wheels and all parts of the blade except that part doing the cutting most bans saws have tilting tables to change the degree of tilt loosen the two trunion clamps and move the table to the desired angle for most work the table is set at 90° to the blade be sure that all adjustments and locks are secure before turning on the power in its travel between the two wheels the blade must be supported by an upper and lower guide as stock is being sawed the guides help prevent the blade from twisting and from being pushed back out of line the upper guide and guard assembly is one of the few adjustments generally required to change the height of the upper assembly loosen the lock on the back of the saw approximately one/ half turn and raise or lower the assembly is necessary be certain that the blade is completely stopped before making this adjustment this is the onoff switch this saw is equipped with a brake turn off the power after using the band saw and apply moderate pressure on the brake until the blade completely stops only the operator should be in the operator's safety zone obtain permission from the structor before operating the saw and wear your goggles for eye protection the correct height of the upper guide should be slightly above the stock but no more than 1/4 in above the maximum thickness of stock to be cut plan sawing procedures so there will be a maximum forward feed with a minimum of backing out of cuts at times it may be necessary to make a cut well into the stock and then back out except for short straight cuts the blade Must Be Stopped before backing out to prevent pulling it off the wheels when stock requires two cuts make the short cut first then the longer cut and the piece will fall free as you complete the long cut if the cut is short and straight you may carefully and slowly back out of the cut with the saw running be extra cautious not to allow the stock to bind and pull the blade off the wheel when possible cut out through waist stock rather than backing out hold stock firmly and feed it into the blade at a moderate rate of speed stock must lie flat on the table so it does not rock or wobble as it is being cut if small curves are desired we must first make many relief cuts to within 132 of an inch of the layout line a 3/4 in radius is the smallest Arc that can be sawed with a 1/4 in Blade and a 1/2 in Blade can cut as small as 1 and 1/4 in radius without relief cuts as we cut to the layout line the small pieces fall away rather than bind on the blade do not allow the saw blade to twist or bind while cutting curves [Music] keep waste from accumulating on the saw table clean off scraps with a piece of wood or a brush after the blade stops do not use your hands or fingers check your layout before cutting try to visualize what will be happening sometimes you will find that you have the layout on the wrong face of the stock and the stock would hit the column of the saw as it is being cut it may even make a difference which end of the cut is started first keep all fingers is at least 3 in from the saw BL do not saw a cross cylindrical stock like this without a special holding device since the direction of force of the blade is downward on the table the cylinder would tend to twist into the blade this often causes the blade to be broken many hold existent homemade equipment may be made and utilized on the band saw a B Block is often used as a special holding device it is commonly used to saw a shallow X curve in the ends of a piece to be turned between centers on the lath or it may be used to rip or split cylindrical pieces to keep fingers away from the blade as we feed the last part through it it is advisable to push the end with a piece of scrap stock sometimes type of circle cutting jig is usually available so accurate circles may be easily sought they work on the principle of a pivot point that may be adjusted to the radi desired this circle jig has the pivot point above the stock many jigs have the pivot point below the stop all special setups should be checked by the instructor before turning on the power [Music] to resaw reasonably narrow stock or cut it edge to edge we may use the rip fence it is always is advisable to have your scrap push piece handy before you start to saw [Music] [Music] [Music] one of the best ways to resaw WID stock is to use a special pivot stand the widest blade available should be installed for this operation the normal cutting position for right-hand operators is to face the blade and stand slightly to the left of it guide with the left hand and apply forward pressure with the right since there is no danger of a kick back on the band saw the operator may even safely align part of his body with the blade a helper should assist the operator when cutting long heavy or awkward pieces the helper merely supports the stock he does not full or guide it tilt the table to the angle desired for cutting a bevel and lock it securely a fence may be used or you may follow a layout line cutting freehand if the blade happens to break step away immediately and shut off the power if possible without endangering yourself then notify the instructor and keep others away until both Wheels have completely sto not allow the upper or lower guard doors to be open open the features of being able to cut free hand and to cut irregular shapes without danger of a kickback make the band saw one of our safest heavyduty woodworking power tools [Music]