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Page 51
8.2 BREAKAGE OR EXCESSIVE DULLING OF BLADES
1. Select the proper blade and spindle speed for the material being cut. For recommendations,
REFER TO SECTION 6.3.
2. Always break in the blade before you start normal cutting.
3. Do not apply excessive down pressure on the workpiece. Excessive down pressure will cause the
teeth to remove too large of a chip, resulting in premature dulling or breakage.
4. Use a good quality, synthetic coolant and maintain the proper ratio of coolant to water as
recommended in SECTION 4.7.
5. Have your blades re-sharpened by someone who has the right equipment for circular cold saw
blades. Improper re-sharpening is one of the most common problems encountered in cold sawing.
6. Keep the blade flange, the face of the blade spindle and the blade clean and free from nicks. Any
contamination or nicks on the flange, spindle or the blade will cause the blade to run out of
alignment.
7. Always remove the back lash when installing a blade. For instructions, REFER TO SECTION
6.1. Also, check the condition of the drive pins when replacing the blade. If the drive pins are
broken or worn, replace them.
8. Any of the above problems may cause a condition known as pick-up. Pick-up is caused when
small pieces of the material being cut adhere themselves to the blade. When pick-up is present,
you will feel a jerking or jumping motion in the saw head while cutting. This is caused by the
blade being pinched as it goes through the material where the pick-up is present.
Pick-up can be removed by using a fine honing stone or a very fine file. When removing pick-up,
care must be taken not to remove any part of the blade. After the pick-up has been removed,
review the above items to determine what caused the problem.