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Posted on 25/03/2016

With the large variety of specification required in creating your Printed circuit boards, PCB Global’s Computer Aided manufacturing (CAM) Engineering department will invariably have a few Engineering Questions (EQ’s) to confirm. One example of a typical EQ relating to Stub Track is shown below:

Stub Track

EQ from CAM:

Stub track that leads to nowhere and has no hole as a through connection.

Explanation:

Small copper stubs that end with a dead end no connection are generally not a problem to fabricate, however, we need to ensure that no via or other connection has been omitted.

Resolution:

With confirmation from our customer this stub track was deleted resulting in a clean pad finish and the net was terminated at the via.

For further tips and information when designing and laying out your printed circuit board design file please do not hesitate to contact our PCB Global team at sales@pcbglobal.com

It is common practice that PCB Global’s Computer Aided manufacturing (CAM) Engineering department will invariably have a few Engineering Questions, also know as, EQ’s to confirm. One example of a typical EQ concerning V-Cut Through Tooling Holes is shown below:

V-Cut Through Tooling Holes

EQ from CAM:

V-grooving lines cutting through the tooling holes on the tooling strips.

Explanation:

The customers panellised files were set up with the v-grooving cutting through the tooling holes. V-grooving must be designed to avoid cutting through tracks, pads, holes and all copper plane areas. As a rule, it is best to have all v-cuts on bare fibreglass only (see below).

Resolution:

With confirmation from our customer both these two tooling holes were moved 10mm to the left to avoid the v-cut.

For further tips and information when designing and laying out your printed circuit board design file please do not hesitate to contact our PCB Global team at sales@pcbglobal.com

PCB Global’s CAM Engineering department will invariably have a few EQ’s to confirm. This is dependant on the quality of the PCB design file package received. See below example of a typical EQ for plated and non-plated through holes:

Plated (PTH) and Non-Plated (NPTH) Through Holes

EQ from CAM:

Holes noted as plated through holes do not have any pads and holes with pads are noted as non-plated through holes.

Explanation:

Generally, holes that have no pads should be non-plated through holes as without a pad landing on the top and bottom layer, the hole wall integrity can be compromised. This causes weakening as chemical solutions can seep into these areas, reducing the long term reliability of the PCB.

With the non-plated through holes with pads, although this is not uncommon, it is still a EQ that is frequently asked. These holes are best fabricated with a copper pull back from the edge of the hole (about 10mill) to ensure that there are no copper burs after drilling.

Resolution:

With confirmation from our customer both these hole types were fabricated as non-plated through holes and the non-plated through holes had the copper pulled back 10mil to ensure quality of the PCB.

For further tips and information when designing and laying out your printed circuit board design file please do not hesitate to contact our PCB Global team at sales@pcbglobal.com

Posted on 18/12/2015

PCB Global now offer UPS as well as DHL Express freight service online for your convenience, along with the option to select your own freight courier. The addition of UPS freight service is to improve the express delivery time to various regions around the world. 

Depending on the quality of the PCB design file package received, PCB Global’s Computer Aided manufacturing (CAM) Engineering department will invariably have a few Engineering Questions, also know as, EQ’s to confirm. One example of a typical EQ is shown below:

Non-Plated Through Hole Cutting into Copper

EQ from CAM:

These 2 non-plated through holes during CNC drilling will intrude and cut into the copper Surface-Mount Technology (SMT) pads as highlighted below (see image).

Explanation:

As a rule, SMT pads must not to be cut or drilled especially with a non-plated hole as this process is fabricated during the final route stage when all the surface finish (immersion Gold, HASL, OSP, Immersion Silver, etc.) has been applied. Therefore, drilling now will result in an exposed copper area on the SMT pads.

Resolution:

In this case with the customer’s approval we shaved the SMT pads by 2mil to ensure no exposed copper.

 

For further tips and information when designing and laying out your printed circuit board design file please do not hesitate to contact our PCB Global team at sales@pcbglobal.com

 

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