Silicon　carbide　(SiC)　is　extremely　hard　and　brittle,　posing　challenges　for　traditional　abrasive　machining.　This　study　used　molecular　dynamics　simulations　to　investigate　synchronous　versus　asynchronous　force-torque　effects　on　SiC　abrasive　machining.　Multi-grit　diamond　abrasion　of　4H-SiC　was　modeled　by　applying　controlled　sinusoidal　forces　and　torques.　Asynchronous　force-torque　increased　material　removal　rates　up　to　2X　versus　synchronous　conditions　by　promoting　particle　agglomeration　and　enabling　trapped　particles　to　contribute.　However,　asynchronous　operation　also　produced　higher　surface　roughness　and　subsurface　cracking　from　greater　penetration.　The　alternating　forces　generated　larger　stresses　that　may　have　driven　more　plastic　deformation　and　brittle　fracture.　The　study　provided　atomic-scale　insights　into　force-torque　effects,　establishing　guidelines　to　potentially　enhance　efficiency　through　asynchronous　operation　despite　drawbacks.　©　2024　Elsevier　Ltd