- May dao gau thu~ thich hgp kh6i dao cao hon m?tbdng may dUng va nang sudt cao.
bl T3 chU'cthi ding hQ'PIy:
B6 tri hi~n truimg cho may ili dao va v~ chuyen diit theo huang xu6ng d6c.
+Gin them thiet bi ring xOivao san lui'ii ben:
Khi may ili thi cong vo; diit c(mg ngum ta co the I~p lum ben cothiet hi ding xo; b
phia sau lum ben. Rang xo; nay co ch6t gift, khi may ill tien de dao diit thi r1ing xo; ch~y truqt tren mij.t diit, khi may lili thi ding xo; bi thimb lum ben gift I~i trb thimb cac rang c~t va xo; diit lam cho diit c(mg tm ra.
Trong di~n ki~n co the thi cho may lam vi~c xu6ng d6c de giam I\I'Ccan.
cIT~n d\lng tai da thOi gian lam vi~e hi~n ieh eua may:+H,n ehe thOi gian nhim r~i eua may: +H,n ehe thOi gian nhim r~i eua may:
De tang h~ s6 thm gian sir d\IDgmay (ktg).
+Rut ngin thOi gian thlfChi~n mqt ehn kjJam vi~e eua may(Tc0:
* H~ che s6 Ian quay dAu cila may ili:
.Nbv~ t6c tien va v~ t6c lili cila may gan bfuIg nhau thi chi nen cho may tien va lili khong can pMi cho may quay dAu.
D! chuyen nhanh trong himb trinh ch~y v~, khi C\l'Iy ngfuI thi khong cAn quay dAu may rna chi tien va lili. .
* Sir d\IDg cong nMn tay ngh~ b~c cao:
De thao mc di~u khien, v~ himb may th~t t6t, nh~y cam d6i vo; tUng lo~i diit va dia hinh thi congo
4.2.2. May san
May san diit la lo(Umay lam diit v~ nang chi! yeu dUng de-san n~n mong cong trinh, nhiit la trong thi cong lam duimg giao thong, ngoal ra no con lam duqc cac cong vi~c khac: xo; diit, bao co, dao rimb thoat nuac hal b.en I~ duimg, b~t ta-Iuy, san rai da dam, cat v.v.
1. can t,o va ding dyng:a. cau t,o: (Hinh 4-20)