Identify the method of tap actor bad quickly

The tap brand on the market is very a lot of more now, because use material to differ character, the price that is the same as norms also differs a lot of, let purchaser be just as have a blurred vision, do not know to buy which good, teach you a few simple methods below: When buying (detect because of notting have equipment, except of the tap that do not have groove) can detect simply (M6 is exemple) : 1: See shovel of whorl of tap chamfer front grind (pour wine cup) even, whether does cutting chamfer blade have quick opening, show well 7 words, show 7 words or U glyph badly (the meeting when exiting silk to attack causes cutting twice, easy rupture and the precision that affects whorl) ; 2: Detect: of heat treatment circumstance? Buzzing aperture breaks ignoranting cover humorous to die rice of? of Zi clang Lu is controlled) smooth fall to whether rupture, break a specification brittleness is big; 3: Knock awl of fracture of wire, seeing its fracture surface is inclined long, the molecular grain in fracture surface (metallographic is organized 10.

5#) fine knot, showing heat treatment and capable person is good character, smooth or inclined short, molecular grain (metallographic is organized) thick bad. Basically depend on to the stand or fall of tap its original material is qualitative, heat treatment, groove, precision, equipment, rotate speed and be pledged by treatment material, hardness, operate the quality of employee to matter etc! When choosing tap, qualitative to the original material of tap, heat treatment, groove want particularly advertent, be aimed at different treatment aperture, the proposal chooses the tap of different type! CNC Milling