Yes. PCB companies that have been awarded ISO certifications asked HOTWU CO., LTD. to provide this service.

Once a fixed focal-length lens has been produced, the magnification of the lens cannot be changed. While inspecting ψ0.1mm~ψ0.4mm drills, you should use a fixed focal-length lens with a larger magnification. If you want to inspectψ0.45mm~ψ1.15mm drills, a lens with a smaller magnification should be used. (As shown below)

The “zoom lens” is an adjustable lens. You can manually rotate the lens adjustment ring to change the magnification. While inspecting ψ0.1mm~ψ0.4mm drills, you should rotate the lens to a larger magnification. If you want to inspect ψ0.45mm~ψ1.15mm drills, the lens should be slowly rotated to a smaller magnification. (As shown below)

After the magnification has been changed by manually rotating the lens, it’s almost impossible to get back to the former magnification manually. The only way would be to contact the quality control department and ask them to send a professional to calibrate it. The calibration process uses an optical calibration slice, which is verified by a tier 2 laboratory to clarify the accuracy of the magnification that has been changed.

Due to ISO certification requirements, it needs to be calibrated 20~30 times a day, requiring more employees in the quality control department.

These three pictures show the same drill.

Fig. 1 is the picture of the drill bit taken by Hotwu’s equipment.

Fig. 2 is the picture of the drill bit taken by another company’s equipment.

On the drill bit, as shown in Fig. 1, the traces ground by the emery wheel produce multiple lines parallel to the Y-axis.

During drilling, the drill bit failed and the traces of failure lie concentrically from the center of the drill tip. It’s obvious that the intersections of the lines cd, ef, and de are the traces of failure. In the SEM picture, the scale is 50μm. Using this scale, you can determine the deviation as 17μm.

Use a microscope.

STEP 1: Find a drill that has just drilled 2400~3000 holes.

STEP 2: Take pictures of this drill using Hotwu equipment.

STEP 3: Take pictures of this drill using another company’s equipment.

STEP 4: Inspect the drill with a microscope. Although the width of the failed drill tip is not easy to identify, you can still see quite a bit of shine on the drill tip.

STEP 5: Inspect another new drill. You can see no shine on the drill tip.

According to the DOE test results from one of the three biggest PCB companies in Taiwan:

a.

If drills with more than 14μm deviation are used on halogen free PCBs, the possibility that broken drills will occur will reach 65%. à Leads to unserviceable PCBs.

b.

If drills with more than 16μm deviation are used on the FR4 PCBs, the possibility that over 3mil deviation will occur on the third board will reach 65%. à Leads to unserviceable PCBs.

c.

The deviation of drills over 16μm will lead to a serious deviation of the holes.