Making with the CNC: Textures.

I’m really interested in textured, and especially the texture create by the first stage of a CNC program, the so called rough machining strategie.

The Roughing is used in the CNC cutting processes to get rid of the execs material, before the final finishing strategies of the CNC job is executed.

As the goal of the roughing is to get rid of execs material the most efficient way, a nice and smooth surface is not important.
This is done by making big parallel steps, or as deep as possible depth passes.
At the end of the rough pass, steps or lines will be visible on the CNC job.
And I quite like these patterns, so why not use them in a more creative way ?

I made a jewellery piece in the past with this effect.
I started to machine various rough structures on a block of wax.Later on I cut slices out of this block, that then would be used to cut out rings that can be casted.

The CNC cut wax block with the structure.

A slice out of the wax block

The result of a cast in bronze


A candle holder.

The next texture project I want to cover is a prototype for a candle holder that I have been working on-With a texture of course.
My first idea was to make a candle holder that will need to be machined from all the 4 sides.

The workflow I used is as  following:
I used Moment of inspiration to design the pieces.
These designs don’t contain any textures.
When I finished a design, I export the design to an STL file.
I then import the STL file in my CAM package, which in this case is Roland SRP player.
In SRP player I then created a rough tool path, which will be responsible for the texture effect.

First design and  CAM simulation, this requires 4 sided machining.

During the design processes in  I discovered that I also could make a design that can be machined from two sides, by rotating my CAD model 45 degrees.
Besides that this give a nice texture, it also gave me the option to simulate, and later to fabricate, more than one design in a block of material.

Several designs in one set.

After several design iterations, I settled with two pieces I wanted to prototype.
The material that I used for the prototype is a medium hard tooling board.
The machine I used for this is a Roland MDX 540, with a 6mm flat cutter.
It took the machine about 70 min to cut each side.

Close up of the final design.

The cut out pieces, ready to be cleaned up.

The final prototypes.