Cac thao tac co ban de det chieu coi g6m eo: iip go, mo go, lu6n coi, dap go,
bat bien (cai dau sgi coi a hai bien), cap chieu, xen chieu.
+ Up go va md go: Cac sgi day de det mgt la chieu da dugc cang san tren khung va dugc luon qua 16 rang go va qua khe giiia cac rang go 6 ben kia.
- Up go: Nguoi thg det chieu can hai dau go det iip chiii phan tren go det sap ve phia minh (xem phan anh dac ta). Khi ay cac sgi day da dugc lu6n qua 16 rang go phia ngudi det (so le 1-1) tao thanh khoang tr6ng de luon sgi coi.
- Md go: la dgng tac "ngugc lai" vdi dgng tac up go, Cii the theo chu trinh lien tuc (lip- mo- lip- md...)
+ Luon c6i (con ggi la vang coi)
Det chieu coi co hai ngudi thao tac go va bat bien, mgt ngudi chuyen luon coi (ngoi phia ben phai ngudi thao tac go).
Coi nguyen lieu khi dem det chieu dugc san ra thanh hai md, moi md chimg mgt chit hai tay. Mgt md dugc xep quay dau g6c vao phia khung det, md kia dugc xep quay dau nggn vao phia khung det de ngudi thao tac vang coi tien luon coi theo each lu6n "gio dau du6i".
Nguoi vang coi ngoac sgi c6i vao nganh vang det (dung tay be gap dau sgi coi cho mac vao nganh vang det). Doan dau sgi coi dugc be gap mac vao nganh vang chimg 7cm, du de bat bien. Ngay sau d6 ngudi lu6n coi diing tay kia liia thanh vang CO ngoac sgi coi th6ng qua khoang tr6ng giiia cae sgi day da dugc ngudi thao tac go
iip hay md go nong san, sang phia ben kia khung det. {Xem phdn dnh khdo td). Dgng
tac vang coi cua ngudi thg quen nghe rat nhanh thuan thuc va chinh xac theo cii tay dugc an djnh theo do dai cua sgi coi va do dai cua thanh vang.
De dat duge chieu dau diing quy each truyen th6ng thi ngudi vang coi phai thugc va thao tac dung chu trinh vang g6c va vang nggn coi. Chu trinh d6 la: "Ngon- g6e- nggn- nggn- g6c- nggn- goc- g6c... Vang nggn tire la ngoac nggn coi sgi vao vang de lu6n coi. Vang g6e la ngoac phan g6c coi vao vang de lu6n coi. Ngudi thao
tac go va ngudi vang lu6n coi c6 quy \xac san vdi nhau: Khi thay up go thi vang lu6n
phan nggn c6i; khi ngira go thi vang lu6n phan g6c coi. Va cii the deu deu tir khi bat dau det cho tdi khi det xong la chieu. Neu chu trinh "goc- nggn- g6c- nggn" la det n6ng hon.
Chu trinh dao nggn va goc sgi coi vira de dam bao do day cua hai ben mep la chieu, dam bao do can doi mjn mang, kh6ng x6 lech hai ben bien la chieu lai vira dam bao my thuat la mau sac cua coi chieu (trang nga- phan g6c coi, xanh nhat phan nggn coi) hai hoa theo diing quy luat cua n6ng det chieu.
Th6ng tiiudng, det chieu dau dat tieu chuan va "c6 gia" thi eir 10cm than chieu, ngudi luon coi phai vang hom 100 sgi c6i, con ngudi dap go phai up, md go va dap go hon 100 lan. Nhu vay, det mgt la chieu dai 1,9m tiii can khoang hon hai nghin sgi coi.
+ Dap go: Khi sgi coi da duge luon (vang) xong thi ngudi det an (dap) go ve phia minh (dap vao long). Hai tay an dap go can phai can deu lire, kh6ng ben nang ben nhe de dam bao cho la chieu det dugc mjn, deu. Sd di ggi la chieu dau- loai chieu coi tot, dat tien la do la chieu dam bao quy each: khi d6 nudc tren mat chieu, nudc hau nhu kh6ng ngam, kh6ng tham, tire la nudc "dau lai" tren chieu.
Vi vay: dap go manh tay thi chieu cang "dau".
+ Bat bien: la tom, cai dau cac sgi coi a hai ben mep chieu. Khi dap go de an
lua sgi coi chat khit vao than chieu xong thi ngudi det thao tac bat bien.
Thao tac bat bien: la ngoac cai dau sgi coi qua lai giira hai sgi day bien de giii cho hai ben mep la chieu dugc giii chae, cae sgi day bien mai kh6ng tut se ra khoi than chieu.
Bat bien chi bat cac "sgi c6i ngiia" (tiic la cae dau sgi coi nam tren sgi day bien 6 hai ben). Cu the la: ngoac dau sgi coi de quang khit xu6ng qua sgi day bien ngoai roi lu6n dau sgi coi quat vao, ngoac qua sgi day bien trong, tir dudi len tren, r6i quat dau sgi coi ra, cai len phia tren sgi day ben ngoai.
M6i sgi coi khi det dugc bat bien 6 mgt dau, 6 bien nay hoac bien kia cua la chieu.
+ Cap chieu: khi det dii do dai la chieu thi tien hanh cap chieu.
Cap chieu la lu6n, rut chat cac sgi day 6 hai dau cua la chieu lai de cac sgi coi chieu khoi bj tut ra.
Cach cap chieu: dung kim (dui) bang tre xu6n de nong 16 theo 16i sgi day ben canh de lu6n dau sgi day sang, chimg 10cm r6i nit dau sgi day, thit chat dau mep chieu lai.
+ Xen cat chieu: Khi da "cap chieu" xong mdi tien hanh xen cat chieu. Thao tac nay g6m hai cong doan la:
- Dung dao xen cac dau sgi coi 6 hai ben bien theo dudng ke thang dugc vach san de cho hai mep chieii phang (chi de cac dau sgi coi chia ra khoi dudng day bien khoang 1cm).
c- Cai chieu (det tao hoa van tren chieu).
Det chieu cai dugc thao tac co ban gi6ng nhu det chieu tron, chieu dau nhu da m6 ta 6 phan tren.
Nhung det chieu cai khac vdi det chieu tron va chieu dau 6 quy trinh va quy each de tao hoa van tren m6i san pham.
- Coi nguyen lieu de det chieu g6m c6 coi trang va coi mau.
- Coi trang la coi sgi mgc (de nguyen, khong nhuom).
- C6i mau de det chieu dugc nhugm mau, theo truyen thong thi chu yeu gom hai mau: xanh la cay va do hong dao, ngoai ra con co nhieu mau sSc khac nhu tim, lam, vang nau...
C6 hai loai coi nhugm: sgi coi duge nhugm hai dau de sao cho det xong, hai ben mep chieu c6 mau, be rgng 10 - 12cm va sgi coi dugc nhugm toan bg.
Thong thudng det chieu cai eii sau hai sgi coi nhugm hai dau thi det mgt sgi coi nhugm toan bg
Thao tac co ban de det chieu cai hoa van la ngira go va iip go. De cho phan sgi c6i mau noi len tao thanh hoa van ch6 nao thi ngudi det "an not" sgi day ch6 ay.
Nhu vay, m6i phan sgi coi mau n6i len tao thanh hoa van chieu cai 6 mat phai la chieu se la phan chim (16m) 6 mat trai la chieu.
Co rat nhieu dang hoa van chieu cai truyen th6ng, tieu bieu la cac dang hoa van: "tram mat trau chim", "tram mat trau n6i"...(theo nguyen tac n6i ben ngoai thi chim ben trong, n6i ben trong thi chim ben ngoai).