We can engraved curved surfaces as well as flat ones, but it depends on the curve and the material. Here’s an example.
We engraved these beautiful beech coffee tamper handles for Made by Knock for their customer, Machina Espresso. They’re so tactile, and are perfect for engraving if you can work with the curved surface. That was the biggest challenge, along with getting the logo centred on the top. You can easily spot if engravings are out by a millimetre.
It’s all about focus
The principle is that flat surfaces should be engraved. This is because the laser beam is focussed vertically onto a horizontal surface. The distance between the lens and the material surface is crucial for high quality engraving. Lenses have specific focal lengths that should be adhered to for best results. Even a tolerance of plus or minus 1mm can be a problem depending on the material used and the lens selected.
These principles need to be adhered to more for sensitive materials like acrylic and metal where a reduction in engraving quality is very easy to spot. Wood, on the other hand, is much more forgiving.
My secret weapon
My secret weapon is my 100mm lens. It allows me to work with a curve of around 8mm, particularly if the material is forgiving like wood is. I’ve used it to engrave these tamper handles and mini wooden baseball bat muddlers for mixing cocktails. It is still important to keep engravings on relatively flat areas for best results.
Before we went into production, we engraved Machina Espresso’s logo on a few tamper handle seconds to judge the largest size the logo could be engraved to keep the logos on the flattest part of the handles. It was important to know at what size engraving quality would deteriorate, and to make sure that engraving results would be consistently high quality.
Glenmore Lodge National Outdoor Training Centre near Aviemore had designed and were creating a new garden for their facilities. It was felt that a training centre would benefit from having an outdoor space to encourage personal reflection.
They approached LaserFlair with the idea of creating a wooden ‘library’ consisting of oak ‘books’ to create a focal point. To add an element of fun, they wanted titles relevent to outdoor activities engraved on their spines. My favourite was Classic Rock.
How to make an outdoor wooden library
Glenmore Lodge provided a list of the titles they wanted engraved on the oak books. They cut the wood into blocks of different shapes and sizes to simulate a shelf of assorted books. Each book was shaped to give the impression of a spine along one side
LaserFlair advised on fonts and layout to get the look and depth of engrave for the right look. We chose a bold font for the text to make it easy to read from a distance, and made the text as large as possible to fit the width of the books’ spines. We decided on a deep engrave for a lasting appearance and texture as the books were designed to be touched and weather with the garden.
Laser engraving the books
Each block of oak was positioned in the machine so that the ‘spine’ was uppermost. We do this because the laser head is aligned vertically and engraves the horizontal surface below. We lowered the machine bed by 15-20cm so that each ‘book’ could be positioned at the correct focal distance from the lens. Maintaining focus is important to achieve good engraving quality. Finally, we raster engraved to create a pleasing 3D effect, and performed two passes to give extra depth to the letters.
Glenmore Lodge love their new garden feature. It gives a sense of intrigue and intimacy.
We’ve been branding stainless steel cocktail keys for Panch Drinks recently. They’re made in three sections for measuring fixed amounts of sweet, sour and strong ingredients, allowing cocktail recipes from mojitos to Moscow mules to be mixed to perfection every time.
These measures are made from stainless steel. Our laser can engrave some types of metal, and stainless steel usually gives good results. We had to use Thermark metal marking paste as the laser can’t engrave the metal directly.
The circular bases of the cocktail keys are only 50mm in diameter, which means that logos must be small to fit the space. As a rule, the smaller the logo is made, the harder it is to reproduce the fine detail when engraving it. Thick lines become thin, and fine detail that would look great on a large scale becomes almost indiscernible when scaled down to a few centimetres wide. In this case, we had to remove all the detail apart from the text, and even then I had to engrave some samples to make sure I could get good engraving results.
How does Thermark work?
Thermark is a mixture of pigment and glass particles. When the laser engraves it, it melts the glass and traps the pigment onto the metal surface, forming an enamel finish for a durable, weatherproof mark. Perfect for using in bars!