Oregon Engineer
ArboristSite Operative
Diesel JD said:My gracious! That is awful......I guess that is a worst case scenario... Is the bar nose hitting a foreign object or another piece of wood usually what causes severe kickback like this?
It was not the most severe encountered on the test rig, some combinations are worse. If you are using professional chains, yellow label, keep your chain brake in good working order. The brake is supposed to stop the drive sprocket before the saw rotates 45 degrees. You may still get hit, but the chain should not be moving. If you are hunched over your saw while cutting and there is less than a 45 degree angle between you and the bar, you may be kissing a moving chain.
The bar nose is hitting a medium density fiberboard block. The MDF board is used in place of wood to keep a consistent test medium. The MDF board is selected based upon density.