国产自慰在线资源|国产精品亚洲中文欧美|亚洲欧美日韩精品专区|在线免费国产视频一区二区|免费一级A级高清毛片人妻|亚洲欧美在线制服丝袜国产|伊人久久大杳蕉夜夜揉夜夜爽|最新哺乳亚洲AV日韩AV二区

Future lumber characteristics depend on the quality of the log. Stress wave velocity is a good predictor of log quality, as it largely influences the dynamic MOE (calculated as the product of density and stress-wave velocity squared).

The Resonance Log Grader is a simple tool. It consists of a hammer and an Android phone or tablet with a specialised software. The user enters the length, then hits the end of the log. The accurate velocity appears on the screen and a grade is assigned based on the results.

1. Set the length of the log.
2. Hit the end of the log with a hammer.
3. Read the calculated velocity and grade appearing on the screen.