Take your shirt off. Lie face down on the bed. Comfy? Well, we’re not going to get exotic oils out and give you a massage, sorry. But we are going to relieve any stresses you might have regarding bandsaw or bandknife blade tension. At least you’re comfortable whilst you listen.
If you’ve ever suffered poor cutting performance from your bandsaw or bandknife blades, it’s highly likely not to be the blade’s fault. It’s more often than not a question of tension – too much or too little. You see, if you don’t set a blade up correctly, no matter how sharp the teeth are or how high quality the steel is, the blade will simply perform badly. So here are a few things you can do.
First, set your blade to the correct tension as this is ever so important. Most bandsaw machines have a factory made blade tensioner. There are many variations, the most popular being a thumb screw type, but the principal will be the same whichever type you have. They have a hard life, so over time, they do wear out and therefore don’t tension quite as they should!
Essential Tool: Bandsaw and Bandknife Blade Tension Gauge
The only true way to measure tension accurately is with a tension gauge. Oh, and guess what? Surprise, surprise, we offer a highly accurate one, purposely made and calibrated for Dakin-Flathers. It’s even got our logo on it so you know it’s the real deal. Simply call us on +44 (0) 1977 705 600 or visit www.dakin-flathers.com for more details. It’s probably the best investment you’ll make for your bandsaw or bandknife machine!
So if your blade isn’t set correctly, what can happen?
Tension too low? The blade can start to flex wildly during the cut – and once it starts, it’s very difficult, if not impossible to correct. You may also experience a washboard effect or chatter lines to the surface of the sawn material. Sound familiar? Probably a result of your tension on the blade being too low.
Tension too high? It’s true that the more tension you have on a blade the straighter it will cut. But, you need just the right amount. The result of excessive tension on the blade can cause tiny hairline cracks which lead to premature blade breakage. In worse case scenarios it may just snap instantly.
Basically, it’s about balance. You need enough tension to ensure a good clean cut but not so much that it damages the blade. Luckily for you, here’s a handy table to help you set up your Dakin-Flathers Bandsaw or Bandknife blade tension precisely:
Get into a Daily De-tension Regime
At the end of the day, the less stress you place on the blade, the longer the blade and the machine’s life will be. That’s why, when you finish cutting for the day, you should de-tension your blades.
Why should you bother? Well, the blade generates heat as it cuts and causes the blade to microscopically expand and stretch. When the blade stops work for the day, the blade then begins to shrink as it cools down. Over time small cracks form on the back edge or gullet of the blade (similar to being over tensioned) which will lead to premature breakage. It also stresses your machine by putting unnecessary forces on the bearings and that tired tension screw.
De-tension your blade each day after use and you’ll extend the life of your blade, your machinery life and your bank balance by cutting down on maintenance costs.
Right, you can put your shirt back on now. Now doesn’t that feel better?