If you don't know what size belt you need, how do you get an accurate measurement? Start by looking for the product manual, which should indicate the correct belt size. If you can't find it, here are some practical tips on how to measure an abrasive belt accurately, so you know what size you need in the future.

METHOD 1: DOUBLE MEASUREMENT METHOD

If your belt is smaller, press it flat against a hard surface and measure it from end to end using a tape measure or string. Double the length and you'll have a good idea of the belt size you need.

METHOD 2: CUT AND MEASURE

If you have an old belt, cut it into a long strip, lay it flat and measure the total length. This technique works with belts of all sizes.

METHOD 3: THE STRING METHOD

Take a piece of string and wrap it around the sander in the same way you would apply the sanding belt. Cut the string where it meets, then measure the length to obtain the size of the belt.

METHOD 4: ROTATION METHOD

Using a pen or marker, make a small mark on the inside of the strip. Then make a corresponding mark on the floor or on a flat surface such as a counter or workbench. Slowly rotate the belt until the mark on the belt touches the surface again, then mark the point of contact. The length of the belt is obtained by measuring between the two marks.