The Science of Bandsaws

Australian Bandsaw Company

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Text Box: I think it would be fair to say that at some time in our past our mothers said to us “If you don't brush your teeth you will lose them”. Surprisingly, this same anecdote applies to bandsawing. The blade brush is another of those overlooked parts of the saw that has a major effect on blade performance. The function of the blade brush is to remove swarf from the blade that does not fall out by itself after the cut (chip weld). If chip weld does occur then that tooth will re-enter the cut and have no capacity to remove more material as the old swarf chip is in the way. This reduction in material removal will reduce cutting speed and efficiency. If there are enough blocked gullets then the reduction in material removal will lead to crooked cutting. Text Box: This crooked cutting may lead the operator to believe that the blade is blunt and see the removal of a perfectly good blade. Once a gullet is full in the cut a couple of different things can happen before it exits the cut. The first is if the force of the full gullet makes the cutting tip disengage from the material, the tip will “bounce” along until the tooth clears the cut. This bouncing will do considerable damage to the tip and prematurely blunt the blade. The second issue relates directly to the opening paragraph. Once the gullet reaches capacity, if the tooth remains engaged in the work, huge forces are generated on the tooth face. These forces can cause a failure in the electron beam weld that holds the Text Box: cutting tip to the backing material. If this has happened it will look like a flat spot about 1mm from where the tooth tip used to be. If the problem is severe then large sections of teeth may be missing. Be aware that these two issues can occur for other reasons as discussed in previous newsletters e.g. incorrect lubricant mixture or tooth pitch. It could be a combination of all three. Operators should be aware that the blade brush should be adjusted and checked regularly. The tips of the wire bristles should only brush the tips of the teeth (1mm or so). Brushing all the way into the top of the gullet will only wear out the brush and the blade quicker. Any brush is better than no brush, so if your machine does not have a blade brush a brush can be mounted on a Text Box: Blade Brushes: A vital link in the chain.

bracket and turned by the blade as it runs.

If it is simply impossible to mount a brush on the machine then you can minimize chip weld by increasing the amount of lubricant in your coolant tank.

If your blade brush does need replacing we always have brushes in stock.

For further information on this or any other issue call Brett on 0413 005 162.

 

Dual Brushes on a Daito UGA260