The scheppach hs 510 log saw has a large 505 mm tct sawblade will allow you to saw through logs 170 mm in diameter in a single pass however by rotating the log around and making a cut from the opposite side this will then slightly increase the cutting capacity and allow you to cut through logs 170 mm in diameterthe hs 510 is totally safe and easy to use and works by placing the log on the machine and then simply push the cradle forward where the retractable guard springs back and the log is