2017 Easter Break

Works Closed

14th-17th April

Printed circuit board Manufacturer, Photoplotting Established 1964  All types of Pcb, surface mount sm, PTH, SS single     single sided, PTH, IMS, ML multi layer printed circuit board  prototypes. Cheap high quality PCBs Printed circuit boards. 

Printed circuit boards tooled up from Gerber,JPG,DXF,and most common file types, or camera ready artworks either 2:1 or 1:1 std scale.

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PCB Drilling:-

 

All performed by CNC machines. The machines can either be programmed optically or directly from the CNC outputs from the modern cad systems. Or if necessary CNC Data can often be extracted from the Gerber photoplot Data files. If both plated and unplated holes are required say for mounting holes or similar please advise separately from the data files as this information isn't always carried through from the CAD systems automatically.   

Our favourite format for the data is  imperial Excellon 2-3 format but we are quite used to most variants and have written software to convert other file formats.

The drills we stock are all metric and start off with 0.05mm size increments which raise to 0.1mm increments for the larger sizes. All imperial sizes from the CAD systems are converted to the nearest larger size. To achieve the correct final size for PTH or Multi Layer Boards we by default increment drill sizes by 0.1mm. 

Small point to note is that holes tend to be a little undersize. This is due mainly to the heat generated during drilling. This causes a small amount of hole shrinkage. Another factor is that drills are often made to a minus tolerance. The net result is that a 1.00mm hole could well measure 0.98mm. Sometimes it can be demonstrated in extreme cases by the fact that a drill will not easily fit back into the hole it has just drilled.

Full documentation of the Std Excellon machine language can be found at

www.excellon.com/manuals/program.htm

Commercial CNC drilling machines vary in size the photo below is of a 12 spindle one from VEGA CNC TECHNOLOGY it weighs 15000kg and measures 4.4m x 2.15m x 2.13m, requires a 15KVA power supply and has spindles that are capable of 200,000 rpm.

 

Very posh in comparison with P&M's first drill but a lot has changed within the industry over the roughly 50 years time difference.

 

 

 

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 Rev  04 January 2017

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