wholesale jewelry laser welding machine
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wholesale jewelry laser welding machine
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jewelry wholesale inc of sumter If you want to grind the drill bitter blade to drill more holes at a time, except that the drill head cannot be too thin (the back corner cannot be too large), when the drill is drilled, the drilling speed cannot Full cooling and lubrication, the amount of swords cannot be too large. If the holes are a little deep, you must diligently lift the drill head to clean up the drill chips on the way to the drill to prevent the drill from being squeezed to death and break the drill. If you can do this, the life of the drill will be longer.