Replies

1. 
   JohnWW | Oct 25, 2007 11:48pm | #1

   The symptoms all suggest a dull blade. Blades don't last long in certain abrasive woods and or when cutting dirty wood. Anytime a band saw starts to cut badly the first thing to try is a fresh blade, it solves the problem 95% of the time.

   John White

1. 
   picapiedra | Nov 06, 2007 08:28pm | #2

   I replaced my blade for a new 3/4" and the problem got resolved.  Thank you very much!

2. 
   maesejuan | Dec 21, 2007 11:25pm | #3

   I'm experiencing a very similar problem of my bandsaw burning dust and both sides of the cut. It seems that in this case the solution is not to change the blade. With all kind of fresh blades the behavior is the same. I would define it as if the machine "refuses" to cut wood. Also, my bandsaw (an 18" ElektraBeckum or Metabo BAS 600) has variable speed, between 1200 fpm and 3200 fpm. At any speed the blades burn the wood although the faster the worse.
   I've tuned up everything in the machine and review the electrical connection at no avail.
   I replaced the lower guides by Cool Blocks.
   I've exhausted all my knowledge and can´t imagine what is happening, although obviously there must be a lateral movement of the blades that make the burning but I can not detect it.
   Also I don't have a way to mesure the blade tension, although I've being using the musical sound criteria for years with perfect results.

1. 
   JohnWW | Dec 21, 2007 11:58pm | #4

   What thickness of cut, in what kind of wood, with what kind of blade (TPI and brand please)?  Did the saw cut well once and but now doesn't?  Are you resawing against a fence?  Is this a new machine?

   John W. 

1. 
   maesejuan | Dec 22, 2007 02:23am | #5

   I've tried with thicknesses between 3/4" and 2 1/2" and the following species: pine, cherry, oak and also MDF and plywood.
   New blades tried: Woodslicer 1/2" 3/4tpi, Timberwolf 1/2" 3 tpi and 6 tpi, Metabo 15 mm 4 tpi and Axminster Power Tools 1/2" 4 tpi and 1/4" 6 tpi.
   The wheels are perfectly coplanar, the tires are new and the tension spring being very robust doesn't seem damaged.
   I bought the machine new and has cut very well for five years and then, began burning the wood.
   I resaw against a fence. Then I tried to find a drift for every blade and found it to be different with different blades but in all cases not too much. The burning happens equally when the workpiece is against the fence o is pushed freehand.
   The only common feature that have all the blades used is the form of the teeth, which are hook type, although they don't seem to have the same rake angles, but I'm not able to mesure them.
   There is only a situation in which there is minimal burning: when I crosscut softwood.
   Thank you very much for your help.Here I'm adding information based in new discoveries:
   The saw has a electronic brake device from Klinger & Born GmbH (model K 400VB/NKA12/KA12). Fortunately it has ceased to work. It has let me to suspect that perhaps a malfunctioning of this device was creating the problem of burning because what it does is to create a direct current which is sent to the motor inverting its rotation.
   I'm now researching the electronic break and also testing the saw. I've confirmed that it works much better, the burning is minimal although it continues. Probably the blades were damaged and are dull now. I have ordered new blades. In a couple of days I'll be able to test the saw again.Edited 12/25/2007 3:17 pm ET by maesejuan Last addition:
   I've tried the saw without the electronic brake, with a new blade and it cuts well again.
   The brake circuit had a clear failure in a soldering of a resistance. I've repaired it but also I've taken away the circuit's fuse. Now it takes a while until the saw stops, but the burning of wood has ceased.
   I'll try to get from the german manufacturer of the circuitry information on how can be the blade movement induced by the action of the brake, because it was indisguisable as such. Only the effects: burning and fuming were visible. I've taken pics and video of it.Edited 12/26/2007 5:32 pm ET by maesejuan

   Edited 12/26/2007 5:34 pm ET by maesejuan