1.Mold surface roughness cross reference

2. EDM MACHINING ACCURACY VDI 3400(HASCO)

Grade	0	3	6	9	12	15	18	21
Ra(um)	0.10	0.15	0.20	0.30	0.40	0.55	0.80	1.10
Grade	24	27	30	33	36	39	42	45
Ra(um)	1.60	2.20	3.20	4.50	6.30	9.00	12.50	18.00

3. preparation befor texturing(based on Mold Tech texture)

3.1 All the EDM or other machining marks must be removed;
3.2 texturing should be completed before other treatment ,such as anodizing or nitriding;
3.3 the minimum finish of the surface to be textured is B3(polished by #320 Grit Paper);
3.4 for the macro texture or that with a depth is less than 0.001”,the surface must be polished by #400/600 grit papers(B2/B1 );
3.5 special attention to drafting angle:
(1)the Min. drafting angle of out surface of
small-sized part:/1˚
over-sized part:/3˚
(2)the relation of the roughness of a textured surface and drafting angle:

Ra	drafting angle
Ra/6.3	≥4˚
Ra < 6.3	≥3˚

(3)one more 1° ~1.5° drafting angle is needed while the depth of outer surface texture is increased by 0.001”.
(4) the drafting angle also is affected by the orientation of texture;
(5) the textured insert,core pins or ejector pins must be oriented;

4. Cross reference of Texture No.

5. Depth of Texture