27-12-2011, 11:40 PM
Metal in woodbased board products can be a problem for certain types of cutting tools as Col pointed out, some times the source material comes from many different sources. Recycled palletts used to be the worst as they inevitably contain bits of shredded ring shank nails also certain types of binder can be abrasive after the pressing process, When I worked on site a hard point hand saw would typically retain a decent edge for two to three weeks but if cutting a lot of chipboard then barely a week, also if any bark material has found its way in to the process this can be abrasive due to its ability to take up and trap dust either when the tree is growing or during any skidding process during extraction, the tree itself takes up many minerals up from the soil and these can crystalize out within the timber and can be hard as stones, even though generally microspic. When I used to plank sawlogs the sharp bands would cut for about 4 hours max in green timber before becoming useless, running them any longer would result in stress cracks, runing the band in that state would be dangerous and lead eventually to the bands total mechanical failure as it cracked in half.
The same goes for chainsaw chains, it is mainly dust in the bark and minerals in the wood (and miss use) that dulls the cutters, in that respect they should be sharpened little and often to maintain a sharp cutting edge, if the chrome plate has worn through then a full re grind and sharpen is the only real option.
Lawrence.
The same goes for chainsaw chains, it is mainly dust in the bark and minerals in the wood (and miss use) that dulls the cutters, in that respect they should be sharpened little and often to maintain a sharp cutting edge, if the chrome plate has worn through then a full re grind and sharpen is the only real option.
Lawrence.
