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Band saw length measuring bulletin:
Band saw dismantling machine have a fixed driving axle and a tension axle that moves to tension the blade and or adjust for different lengths. This bulletin does not deal with how to tension blades.
On most machines the tension axle moves back and forth with relation to the driving axle from 4 to 8 inches. Each inch that the tension axle moves results in a difference in length of the band saw of 2 inches.
How to measure band saw lengths available for your band saw dismantling machine.
With a known size band saw blade mounted as you would normally operate it, find a fixed non movable point on your dismantling machine near the movable axle which is parallel with the travel of the band saw blade and measure the distance from that point to the axle of the adjustable wheel. Next move the tension axle towards the drive wheel as far as it may travel and still operate and measure the distance. Now subtract the smaller measurement from the larger and multiply the result by 2 and subtract that resulting measurement from the size of the current band saw blade. Example-- if your current blade is 22’ and the length of travel is 2 inches you would subtract 4 inches from 22’ and find you could use anything between 21’ 8” and 22’. (caution—you need a small amount of travel extra to permit easy mounting. I have heard of a crew who deflated the tires to mount the blades???)
For length changes the procedure is similar. Take the first measurement made remove the blade from the wheel and move the axle back as far as it can travel and operate and take the additional distance of travel double it and add that to the size of the current blade. (example—if using a 22’ blade and the additional travel is 4 inches you add 8 inches to 22” and find you could use a blade up to 22’ 8” (note again the need for some variance for mounting)
Conclusion – you could use any blade from 21’ 8” to 22’ 8” on your machine.
Frank Your saw blade specialist
www.McgillsWarehouse.com 818 765 1280