Trepanning is basically deep hole boring with a difference in that it leaves a core. It is an efficient method for drilling deep large deep holes that is more cost-effective than deep hole boring.

The most common use for trepanning is cutting a core out of a larger solid leaving two pieces. The removed material is not reduced to swarf as with drilling but remains a solid billet. The most common example is a solid billet that is left with a hole bored through from end to end and a second smaller round bar that is excised by cutting around it. It can be intended as a roughing operation, destined to be machined further or honed to a finer finish. Alternatively, trepanning alone is sometimes adequate for the job in hand. In fact, people often ask for trepanning when all they want is a deep hole or process bore.

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This is a part that has been trepanned.

Producing blind bores into precision machined components, and responsibly quoting for them, should always result in more questions for the customer. As much as time is short during our busy working days, and these queries often result in a little lost time, it’s always worth investigating at the design stage whether the form required suits the process needed to produce it or will require a non-standard tool.

Watch our appearance on #SwarfandChips, the weekly engineering YouTube show from MTD CNC. You can watch the video on MTD CNC's website, YouTube or by clicking play below.

We have recently been enjoying utilising our latest Colchester CNC lathe – the newest addition to our CNC large turning section here at Hone All Precision. The Colchester Lathe Company, based in Heckmondwike in West Yorkshire, is one of the world’s leading producers of CNC lathes and supporting equipment.

The process of gundrilling was initially developed to create uniform sized holes in artillery pieces and rifles. Techniques and technologies were set in place to give repeatable, highly accurate results on mass armament production lines, from the late 19th century onwards. Gundrilling is still used in the defence industry, but has far wider applications too.

When carried out using the right equipment and with the right training, gundrilling delivers reliable results each time. This is the reason the technique – which you may also know as deep hole drilling – is so widely used in manufacturing. Hundreds of aerospace, automotive and medical components, among others, use gun drilling to produce precision holes of almost any length.

Gundrilling (alternatively called Deep Hole Drilling) is a reliable method used to make precision holes in a wide range of metal and plastic components.  The method is known for its efficiency in creating perfectly round drilled holes and straight drill channels. However, sometimes mistakes are made with gundrilling that affects the final accuracy of the result.

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