Preparations PCB factory need to do before drilling
1. The PCB factory regularly cleans the magnetic head and other parts:
For selected tape drives, tape drives or floppy disk devices, the heads must be cleaned on time. In addition, the light bulbs, lenses, light-emitting tubes and photocells of the paper tape machine should also be cleaned regularly.
2. The circuit board factory (PCB circuit board) reasonably sets the parameters:
The main parameters of the equipment include coordinates, metric/imperial, absolute/incremental, EIA code/ASC code, leading zero/rear zero, etc.
The basic parameters of the drill include T (1/2/3), drill diameter, feed, speed, etc.
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3. The circuit board factory preheats the equipment in advance:
The spindle that starts the ball bearing must be preheated in advance. If it is more than 1 hour away from the use time, it has to be warmed up again. Oil mist lubricated spindles are a special case and do not require preheating. The above preheating operation can keep the CNC drilling machine safe and stable. Insufficient preheating results in more low-quality drill holes.
So how to preheat the spindle? In fact, the drill bit is loaded into the collet chuck, and the drilling speed of the drill bit is controlled at 15,000 per minute, and it must continue to rotate for a quarter of an hour. If there is a special preheating program then the efficiency will be very high. Remember that if the collet chuck rotates at high speed without the drill bit installed, it is bound to destroy the spindle. Everyone must pay attention to this!
4. The drilling quality of the circuit board factory is closely related to the radial runout of the drill shaft, so it should be checked on time. The method is still very simple: put the standard rod into the collet, place the measuring head of the dial indicator at a distance of about 19 mm from the lower end face of the collet, and then slowly rotate the drill shaft. The amount of beating is measured. Each drill shaft of some CNC drilling machines is equipped with a laser measuring instrument, which can measure the diameter, radial runout and axial dimension of the drill bit. If there is such a device, the efficiency will be improved a lot. Under normal circumstances, the replacement cycle of the collet is half a year, which should be noted.
PCB inquiry, you could ask: [email protected]