Common problems and treatment to pcb board drilling process

1. Common Problems And Treatment To PCB Board Drilling
Process
As we know, there're many steps for PCB board fabrication. During the process, drilling is
one of the most important process, many problems may happen during the process. Here
I make introduction on the main problems and relative treatment.
1、drilling bit broken
Root cause includes：Excessive spindle deflection; wrong operation taken by operator
during drilling; Not appropriate choosing to drilling bit ；insufficient rotate speed to drill
bit;Laminated layer too much；Debris between plate and plate or under plate；the depth of
the drilling spindle too deep cause poor chip removal; Amounts of drill tip grinding and
super life use; Cover scratches crease, plate bending uneven; Fixed base board tape too
wide or flat aluminum, plank is too small; Feeding speed is too fast compression; Improper
operation during hole filling; Under the cover plate aluminium serious plugging ash;
Welding the center of the drill tip pointed and drill tip handle deviation in the center.
Solution：
(1) Notice the part to repair the spindle, ore change for better spindle
(2) A、Check whether there is stress beriberi pipeline jam
B、Adjust the pressure of the foot according to the situation of the drill bit, check the
pressure data of the foot when pressing, the normal is 7.5 kg；
C、Check the spindle speed variation and whether there is copper wire inside the
clamp mouth uniformity which may impact speed
D、Check the spindle speed variation and the stability of the main shaft.
E、Carefully adjust the pressure between the feet and bit, drill tip pointed not show
presser foot, allowing only the tops of drill within the presser foot 3.0 mm
F、Test the parallel degree of mesa drilling and stability
(3) check the geometry shape of drill bit, wear and use chip back slot length appropriate
drilling bit.
(4) select the appropriate amount of feed, reduce feed rate.
(5) reduce to the appropriate number of laminated.
(6) when the upper plate clean surfaces and under the cover of sundry, keep the surface
clean.
(7) adjustment notification machine spindle drilling depth, maintain good drilling depth.
(normal to control the depth of the hole in the 0.6 mm shall prevail.)
(8) number control grinding (wi) or in accordance with the parameters in the table Settings.
(9) choose suitable surface hardness, flat cover and plate.
(10) carefully check the status of tape fixed and width, replace the cover plate aluminium
sheet, check the size.
(11) decrease the feed rate.
(12) operation should pay attention to the correct hole location.
(13) A, check the height of presser foot and presser foot exhaust slot is normal;

2. 2、via damage
Root cause includes：
Taking the drill bit after broken; PCB board drilling without aluminum or clamp the blank;
Parameter error; Drill bit elongate; valid length of drill bit can't meet the requirements of
drilling pile layer thickness; Hand drilling; Burred caused because of special raw material.
Solution：
(1) according to the previous problem, ruling out cause of knife breaking, make the right
treatment.
2) aluminum and back plane perform as protection to the via, must be used during
production, distinguish the available and unavailable back plane, put them at the same
direction, need to be taken double check before using.
(3) before drilling, must check if the drilling depth is in accordance with the drilling bit,
check parameters of every drill bit are set correctly.
(4) check the location of the drill bit is correct when drilling machine catching the drill bit,
then start the machine, boot drill tip generally can not exceed the presser foot when
machine start.
(5) Check the valid length of the drill bit by visual before put onto machine, and measure
the fold number of the available working laminates.
(6) If the accuracy, rotate speed of hand drilling can't meet the the requirement, manual
drilling should be forbidden.
(7) When setting the parameters to special raw material, proper selection of parameters
should be taken according to the situation of quality, feed should not be too fast.
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Email：wonderful09@wonderfulpcb.com
Website：http://www.wonderfulpcb.com
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