Stationary Sanding Machines PDF

Stationary Sanding Machines  Sanding machines cut down on prep time – saves money  Bobbin Sander or Oscillating Spindle Sander o Most often used to sand inside curves o Spindle oscillates up and down while rotating  This evens the wear on the sanding sleeve o Different diameter spindles are avail...

Stationary Sanding Machines  Sanding machines cut down on prep time – saves money  Bobbin Sander or Oscillating Spindle Sander o Most often used to sand inside curves o Spindle oscillates up and down while rotating  This evens the wear on the sanding sleeve o Different diameter spindles are available  Always use the largest one possible o Sanding sleeves are held on the rubber spindle by friction  Usually tightened with a nut o Spindles are held in the machine with a Morse taper and a bolt/nut  Be careful not to overtighten as it will make the spindle difficult to remove and can damage the machine o Some having tilting tables  Can sand angled curves o Takes some practice to be able to sand without creating divots  Disc Sander o No matter the direction of rotation only use the half of the disc that is rotating towards the table o Variety of sizes  Stand-alone units usually have larger discs 20-24” common o Outside of the disc spins faster so it will sand faster o Platen has no given, not like orbital sanders  Allows for very flat sanding o Discs are usually attached with PSA o Should not be used for face grain  Will leave cross-grain scratches o Best use is on end grain  Great for cleaning up saw marks or removing a very small amount to fit a part o Tilting table on most models o Can get combination belt sander machine o Most belts have a direction due to the splice  Crepe Blocks o Rubber block o Variety of sizes o Uses to clean out belts and discs  Pump Drum Sander o Not very common o Uses inflatable drums o Pressure can be regulated to allow for more flex o Great for curved parts or irregular shapes like chair legs o Can be equipped with a flap wheel sander used for de-nibbing  Edge Sanders o Very versatile  Can be used to sand inside and outside curves o Runs a long belt vertically between 2 pulleys  Larger rear pulley is driven  Smaller front pulley is used for tracking – has camber o Outside curves on long flat platen o Inside curves on small pulley  Be careful when sanding thick parts, the pulley is not perfectly perpendicular, can give an angled finished surface  Better results on thinner parts o Always feed against the rotation of the belt o Small parts can easily be grabbed and thrown  Stroke sanders o Very large machines  6’ table is considered small o One of the only sanders that requires no extra sanding before finishing  Sands in a straight line o Designed for flat panels  Though some are used to sand profiles o Table rolls in and out o Platen is moved back and forth using a handle  This can also be done free hand o 2 handed operation that takes some skill to master  Any pausing will cause a divot o Each pass should overlap by 50% o Becoming less common with the prevalence of thickness and finishing sanders  Drum Sanders o Smaller ones have a single drum o Multiple drum units will have progressive grits o Smaller surface contact  Sandpaper fills easily  Not a sleeve, spirals onto the drum  Spring loaded clips that hold tension  Wide Surfaces Sanders o Two types  Thickness sander  Designed to remove more stock like a thickness planer  Usually have progressive grits – rough to fine  Usually run drums  Have a small surface contact area  Finishing sander  Like our Timesaver  Removes small amounts of material  Usually runs wide belts running over a platen  Have a large surface contact area o All have a track/belt that feeds parts through  Track speed can be adjusted, belt/drum speed cannot o Belts are 1” wider than track, allows for left and right tracking o 24” is a small size, 36”, 48” and 52” are common in larger shops o Very expensive machines, start at about $10,000