1. Single References.Kiu la chn ny cho php ta to mt im m v tr ca im nm trn mt i tng no . Hay trong hp thoi DATUM POINT References ch xut hin mt i tng references l Surface, Edge, Circular Edge, Vertex.Trnh t to points vi la chn Single References:Click hay theo ng dn Insert > Model Datum > Point. Hp thoi DATUM POINT xut hin. Ta c cc hnh thc xc nh v tr ca point nh sau:

a). Point nm trn mt mt Surface:Trnh t thc hin nh sau: Insert > Model Datum > Point > Hp thoi DATUM POINT xut hin. Click chn v tr ca point trn mc surface mun to, lc ny trong hp thoi DATUM POINT c cc la chn nh sau:

Ta s thc hin vic to mt Datum Point trn mt chi tit nh di:

Khi chn On th im to s nm ngay trn mc m ta chn lm References, khi chn Offset s cho php chng ta offset point ny theo phng vung gc vi mc References mt khong ta nhp.

b). Point nm trn mt cnh (Edge):Trnh t thc hin nh sau: Insert > Model Datum > Point > Hp thoi DATUM POINT xut hin. Click chn cnh mun c point, lc ny hp thoi DATUM POINT s c cc la chn nh sau:

Mun to nhiu point nm trn mt cnh v c cng im End Of Curve th: Right click ln point va to (PNT0) > Duplicate.

c). Point nm trn mt cung trn (Circular Edge):Cch to cng tng t nh to point nm trn mt cnh (Edge) nu Point nm trn cnh ca cung. Trong trng hp point nm ti tm ca cung c chn th ta s la chn trong hp thoi DATUM POINT thng s Center.

d). Click chn trc tip vo im Vertex:

2. Multiple References.Ngc li vi Single References, point c to ra bng cch ly giao nhau gia cc i tng references. Trong hp thoai DATUM POINT References s xut hin nhiu i tng references.

a). To point l giao gia 3 mt phng (Three Plane):Trnh t thc hin nh sau: Insert > Model Datum > Point > Hp thoi DATUM POINT xut hin. Click chn 3 mc phng giao nhau to Point:

Trong hp thoi DATUM POINT References s xut hin 3 references nh hp thoi bn di:

b). To point l giao gia 2 cnh (Edge):Click chn hai cnh giao nhau:

c). To Point l giao gia mt Datum Axis v mt Datum Plane:

3. Sketcher Points.Cho php chng ta to cc point ngay trong mi trng Sketch. C cc hnh thc to mt point trong mi trng sketch sau.Trnh t thc hin lnh: Click Insert > Model Datum > Point > Sketched. Hay trn thanh cng c Datums toolbar, click mi tn m thanh cng c Datum Point Palette , v click , hp thoi Sketch Datum Point xut hin. Chn mt mt phng vo trong mi trng Sketch > Click Sketch trn hp thoi Sketch Datum Point vo mi trng v sketch. Trong mi trng sketch hnh thnh 1 point ta c hai cch nh sau: Click to point. Trong trng hp nu c s giao nhau gia 3 ng Contruction Curve tr ln th cng to nn point, v d bn di l s giao nhau gia 3 ng contruction curve:

4. Offset Cordinate System.Cho php ta to cc im c offset t gc ta theo cc phng X, Y, Z.a). Trnh t thc hin lnh nh sau: Click Insert > Model Datum > Point > Offset Cordinate System. Hay trn thanh cng c Datums toolbar, click mi tn m thanh cng c Datum Point Palette , v click , hp thoi Offset CSys Datum Point xut hin.

Ta s nhp mt s ta ca 6 point, v d nh trong hp thoi Offset CSys Datum Point bn di:

ImportCho php chng ta ly mt file c dng (*.pts), file ny c to trc bng lnh to point Offset Cordinate System. SaveCho php chng ta la li cc point ang to di dng mt file c ui l (*.pts). Update ValuesCp nht gi tr thay i ca cc point.

b). Khi hiu chnh nhanh gi tr ca cc point th: Right click ln point hiu chnh > Edit. Lc ny xut hin hp thoi MOD ARR NUM thng bo:

SingleCh hiu chnh 1 point, im ny chnh l im m ta chn vo v right click hiu chnh. AllHiu chnh tt c cc point. Lc ny trn mn hnh s xut hin:

c). i vi h ta tr (Cylindrical)S cho php chng ta nhp cc thng s v: bn knh (Radius). Gc xoay (Angle). V tr theo phng Z.Trong gc xoay (Angle) c tnh t chiu dng trc X ca gc ta v xoay ngc chiu kim ng h.

d). i vi h ta cu (Spherical)Cho php chng ta nhp cc gi tr gm: Bn knh Radius v 2 gc. Bn knh c xc nh theo phng Z, gc u tin c tnh trong mc phng X-Y ca gc ta v c tnh ngc chiu kim ng h theo chiu dng ca trc X, gc cn li c tnh ngc chiu kim ng h theo chiu dng ca trc Z.

5. Field Datum Point.Cho php chng ta to ra cc point m khng yu cu kch thc, la chn ny thng c s dng to cc point trong mi trng thit k khng i hi kch thc chnh xc.Trnh t thc hin lnh nh sau: Click Insert > Model Datum > Point > Field. Hay trn thanh cng c Datums toolbar, click mi tn m thanh cng c Datum Point Palette , v click , hp thoi Field Datum Point xut hin:

Chn mt references lm v tr t point nh l mt Curve, Edge, Surface, Quilt. Click Ok trn hp thoi Field Datum Point kt thc lnh.