CNC Mill

Online Presentation URL

http://prezi.com/mzh_jf1wmlyr/?utm_campaign=share&utm_medium=copy

What is a CNC Mill?

To explain a CNC mill we must first describe the milling process. Milling is using a rotary tool to remove material from a workpiece by means of moving the part along the X, Y, or Z axis. The most common type is a vertical mill where the axis of rotation of the blade is the vertical axis. The bit used is much like a drill bit except these bits are not only meant to be able to create holes in the part, they can cut on their sides too.

  The most common type is a vertical mill where the axis of rotation of the blade is the vertical axis. The bit used is much like a drill bit except these bits are not only meant to be able to create holes in the part, they can cut on their sides too.  

CNC stands for computer numerical controller. Numerical control is the process is the automation of machine tools that are operated by precisely programmed commands encoded on a storage medium, as opposed to controlled manually by hand wheels or levers, or mechanically automated by cams alone.

Putting the two together brings forth the CNC mill. Rather than using cranks and handles to manually mill a workpiece, given the code, a CNC mill with automatically mill the part more precisely and quickly than a human could. Because of the computer control, parts can be more complex.  The more complex machines have two extra axis to allow for the rotation of the workpiece and tilt of the tool itself to allow for asymmetric and eccentric super complex designs.

  This is useful because simple parts can be made quickly and more precisely than by use of a manual mill. Also this allows for more complex parts to be machined out of a single workpiece instead of from multiple or by means of other manufacturing techniques which may lead to imperfections or a less durable piece.  

What are the limitations?

 Some limitations include drill bit size and prototype size. You cannot bore square-edged holes in the material. The initial investment is expensive, but that is going down. Requires its users to still be trained in mathematics and engineering programs such as creo parametric, solid works, etc. to at least program the cuts.   

Where is this on campus?

1. Mechanical Engineering Machine Shop (HH C-109)

2. Formula SAE/ICE Garage (Below Gesling Stadium)

How can I gain access?

1. Be a mechanical engineer trained in machine shop practices and CNC classes offered. Also, if you know a friend who is certified and ask them to do it for you.

2. Be a member of the Formula SAE Team and do shop training with a member of the team. Also must complete the safety course on the CMU website.

Reflection:

Two of our members had some work with the CNC machines already so they had a general idea as to how it worked. It was still interesting to do some more research as to how it specifically works in a little more detail.