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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

 

Once the customer order and PCB design file is received the PCB Global production engineering team will process the manufacturing data which is required at every stage of PCB fabrication. This ensures that your Printed Circuit Boards are manufactured to your specifications. There are multiple combinations when it comes to PCB finishes and specifications. Listed below is an example of a typical 4-layer multi-layer data required on a job card to ensure that all customer manufacturing conformance is adhered to:

PART NUMBER– PCB GLOBAL 123456-A

LAYER – 4 layer

QUANTITY– 512pcs

PRODUCTION PANEL SIZE– 450 x 650 mm

PRODUCTION PANEL QUANTITY- 32

UNIT SIZE– 90 x 150 mm

PANEL SIZE– 300 x 200 mm

BOARDS PER PANEL– 4

MATERIAL– FR4 High TG=170 - S1170

PCB THICKNESS– 1.6mm

COPPER FOIL– 18um Copper

PRE-PREG– 7628HR RC: 47% 0.21mm

CORE – 1.0mm 35/35um Copper

SOLDER MASK COLOUR– Blue

COMPONENT LEGEND COLOUR–  Yellow

SURFACE FINISH– Immersion Gold – ENIG 2-3u”

PROFILING– Panel route with break tabs

This break-down ensures that the operators at each stage of fabrication will assume the precise finishes required on this part number as it flows through the production line. A typical workflow for a standard 4-layer through the PCB Global processes is demonstrated through many small processs.

Firstly the inner layer material is cut and the inner layer laminating and exposure is completed. Developing, etching and AOI inspection is the followed up by copper foil and pre-preg cut and multilayer lamination and pressing. Next the CNC drilling will take place in preparation for Desmear and Electrolysis Copper plating. Once this is complete, laminating and exposure is pattern plaited (Copper & Tin/Lead) and etched with a further AOI Inspection. LPI solder mask along with the component legend silkscreen is applied and then sent to bare board testing. Immersion gold is added with a further CNC routing. The boards are then clarified with deionised water before the final QA. The boards are then packed and dispatched to your requested delivery address.

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