Scratching　force　is　a　significant　factor　to　evaluate　the　characteristics　of　single　diamond　grit　scratching　process.　In　this　paper,　experimental　study　was　carried　out　to　investigate　the　vibration　characteristics　of　force　signals　during　the　scratching　process.　A　precise　multicomponent　dynamometer　is　employed　in　the　force　measurement　during　a　single　diamond　grit　scratching　on　pure　copper.　The　frequencies　of　the　vibration　section　of　force　signals　with　different　scratching　parameters　are　calculated　and　analyzed.　The　influence　of　force　signal　vibration　on　the　measuring　accuracy　of　dynamometer　is　systematically　analyzed　further.　The　results　show　that　higher　scratching　speed　and　larger　scratching　depth　lead　to　larger　vibration　amplitudes　of　the　force　signals.　Strong　impact　on　the　quartz　piezoelectric　crystal　of　dynamometer,　which　is　produced　indirectly　by　single　diamond　grit　scratching　process,　leads　to　the　vibration　of　scratching　force　signal.　The　first　semi-sinusoidal　force　signal　is　the　actual　scratching　force.　The　vibration　of　the　scratching　force　signal　has　little　effect　on　the　measuring　accuracy　of　the　dynamometer.　©　2020　Manufacturing　Technology.