Rotary cutter blades are actually supposed to rotate! Many quilters mistakenly believe that the rotary cutter should perform like a knife, sawing through the fabric layers. However, a rotary cutter blade should turn freely, just like a pizza cutter.
If you have your locking screw set so tightly that the rotary cutter blade does not move, your blade and cutting mat will wear out prematurely, and you'll fatigue much more quickly as you try to "bear down" to cut through multiple fabric layers with a fixed blade. While you're at it, give your rotary cutter a little TLC and you'll reap the rewards of clean, crisp cuts.
Carefully disassemble your cutter, laying the pieces in sequential order on your table so that you can easily put it back together. If you're nervous about being able to reassemble it, put your digital camera to good use and snap photographs at each stage of disassembly to help guide you later.
Wipe lint buildup from behind the cutting blade. Next add one small drop of sewing machine oil (you may use the oil that came with your longarm) on the plastic surface that sits next to your blade. This small amount of lubrication prevents rust and keeps the blade spinning smoothly.
Reassemble the cutter, keeping in mind that the nut holding the blade should be loose enough that the blade rotates as you slice your fabric. If your cleaning and readjustment don't greatly improve your cutter's performance, it may be time for a new blade!
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