Changing the tooth shape for a perfect cut


I’d like to share with you a recent experience with a customer’s circular saw blade that I changed to make the teeth cut finer without the customer having to buy a new saw blade.  The customer was trying to accomplish a  particular job with his saw blade without spending a lot of money, as this was a one off job. 

The customer was wanting to cut 6mm plywood with his portable circular saw. The blade was a 210mm diameter x 40 teeth. This blade is far too coarse for cutting the 6mm plywood board.
The blade before modifying was chomping and splintering it’s way through the plywood board and also having a blunt blade didn’t help the customer to achieve the desired result. 

I suggested to the customer that he would require a finer tooth blade for cutting the plywood board. After recommending the correct saw blade the customer informed me that he didn’t want to purchase a new blade as he would not have any further use for this blade once he had finished cutting the plywood board.

Ok I thought…… this is going to be a job for Captain Saw Doctor and his repertoire of skills. I suggested changing the style of tooth that would make the blade cut cleaner and feel like the blade is a finer tooth blade. 

To achieve the customer’s desired effect without breaking the budget was to firstly change the face of the tooth to a alternate face bevel of 8º. Normally the face angle is 0º. The second procedure was to change the top bevel angle to an alternate 30º bevel. Changing the blade to these cutting angles would make the blade cut as though it was a 70 to 80 tooth blade.



The purpose of the 8º face bevel is to make the face of the tooth sharper.  The bevel on the face of tooth makes the cutting edge have a leading edge as the tooth enters the cut. 


The purpose of the 30º alternate top bevel angle is to make the cutting point like a sharp needle point. Combining both the 8º face bevel and the 30º top bevel ensures the cutting point scores the plywood before the tooth actually starts cutting the plywood on both the top edge and underneath the cut.

The only disadvantage of this tooth design is that the edge dulls quicker because of the sharp cutting angles. This is a small price to pay for considering the cutting results that are achieved without having to purchase a extra blade that will give the same cutting results.

The customer was delighted, the job completed and all without the expense of having to purchase a new saw blade. 

Until next time……..Happy Cutting


February 24, 2014

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