Cac yt mang tc hinh hoc cua dung cu cat v ache do cat toi do nham bm

Hinh ve the hien moi quan he giua chieu cao nhap nho te vi Rz va luong tien dao S khi tien

Neu S > 0,15 mm/vong

Rz= S^2/(8.r)

S luong chay dao

Rz chieu cao nhap nho te vi

r banh kinh mui dao

neu s < 0,1 mm/vong

Rz= S^2/(8.r) +(hmin/2).(1+r.hmin/s^2)

Hmin : chieu day phoi nho nhat

Neu S < 0,03 mm/v  thi Rz tang

Hinh ve .2 luoi dao cat tao ra map mo co chieu cao Rz .luong chay dao S1.

Khi thay doi luogn chay daoS1 - S2 thi Rz giam, thay doi goc chay dao thi Rz thay doi ca kich thuoc va hinh dang, dau mui dao tron thi hinh dang map mo cung co day tron, r tang thi Rz giam.