Custom CNC Machining
Compute Numerical Control (CNC) Turning is a popular and common CNC process. An appropriate metal component to be CNC’d is fixed in the chuck of the lathe with one end protruding. In some instances where an extended metal components to be CNC’d, then the other end of the part will need to be fixed into a tailstock.
Once this setup is completed, then several major alterations to this component can be made.
The most basic turning machining process is where a tool is extended out towards the rotating metal item at a right angle to the axis of rotation. When done in increments, selected parts of the metal item can be removed under the flow of appropriate cutting oil.
Where appropriate, the tailstock can be offset and a tapered turning can be achieved.
The cutting tool used for CNC machining will vary with the type of surface to be machined and the type of finish that’s needed. Roughness accuracy can be measured in micrometers or surface roughness. Typically, the job defines which method is to be used or what measure of surface roughness is to be gained.
CNC Machining facing is a turning process where the end of metal item is finished. i.e the tool is set to a right angled to the longitudinal feed, and the cross slide is used to move the tool across the end of the item removing a few thousands of an inch in material. This can be cosmetic process and is typically used in the start and end of a turning process.
Where the above process is used in the middle of a machined part, it’s known as “parting” as a metal shaft can be cut into two. However, a partial “parting” is called a groove. An indentation is made in the shaft without extending too much to make it a parting.
CNC boring is done with the cutting tool at the end of the shaft, placed parallel to the longitudinal axis of the shaft, and when moved inwards, will cut a circular groove or indentation into the shaft. With an extended tool, a longer hollow shaft can be machined.
There are a few more CNC machining processes to accomplish specialised tasks. There is reaming, which is enlarging an already drilled hole to cater for a more precise diameter. Some of these extended holes can then be tapped for screws and threaded bolts.
In other instances, polygonal turning is required for non circular items to be machined and formed.