PCB drill principle: pcb drill belongs to a cutting action, thus cutting substantially the same as the general principle; in general, there are two formulas in the drilling operation widely applied to: 1. R. P. M = (S.F.M * 12) / π * D2. I. P. M = RPM * Chipload introduces each unit said two companies: ⑴R.PM = rotational speed of the drill, PCB drill collar machine, rev / min, there are a few turns per minute (Revolution PerMinute). ⑵S.FM = surface speed, PCB drill collar automatic machine, ft / min, the edge stitches per minute drill on the surface of the cutting board in the distance or length (Surface Feet Per Minute). ⑶D: drill diameter (Diameter). ⑷I.PM: feed speed, collar machine, inch / min, every minute how much feed depth inch (Inch PerMinute). ⑸Chipload: feed rate, ㏕ / rev, infeed depth per revolution number ㏕, with this brief RPM = (SFM * 12) / π * D Formulas source. After the plate, PC boards, plate firmly affixed with adhesive tape, to clinch designated place with a fixed needle. 2. Try to avoid using deformation of PC board. 3. Try to use thick aluminum plate or a synthetic resin sheet 0.15 ~ 0.2mm of 0.3 ~ 0.4mm based. The pad is not hard to take, but the need to pursue a uniform thickness. After the plate, PC boards, plate firmly affixed with adhesive tape, to clinch designated place with a fixed needle. 2. Try to avoid using deformation of PC board. 3. Try to use thick aluminum plate or a synthetic resin sheet 0.15 ~ 0.2mm of 0.3 ~ 0.4mm based. The pad is not hard to take, but the need to pursue a uniform thickness. Sales of automatic collar Machine | collar Machine | Macros Lean automation provided by the Friends of the Friends of the Shenzhen-Hong Lean Automation Limited. Friends Lean Automation Co., Ltd. Shenzhen-Hong (www.winsole.cn) (www.hy978.com) strong, credible, in Shenzhen, Guangdong industrial automation control systems and equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Acer Friends Lean automation into the brilliant and you work for a better future!