Customer A needs a stainless steel bar with a slotted headphone (groove depth of 0.5mm, width of 1mm), the lathe depth and position accuracy is not stable, can not meet the requirements, after A customer finds Ogilvy, our technical staff through hard study, The processing method was optimized several times, and finally the depth of slotting was stabilized within a range of ±0.02 mm. The minimum thickness of flute was 0.2 mm, which successfully solved the technical problem of this product.