Fabrication Lab

Working With The CNC Template

Our templates are designed to aid the dialog between designer and machine operator. Working within the template will also aid in a better understanding of the milling process which in turn helps to turn concept drawings into fabrication les/drawings. Our layer-naming conventions reect a nomenclature used here at the School of Design. And while every fabricating facilities has a slightly differnet nomeclature, beng conversant with these general terms will allow you to speak professionally and comprehensively with fabrication teams outside of the School of Design.

Know Your Layers

Bed Size - this layer is locked and should never be changed. It is the working area of the CNC (24”x 26.5”)

Stock Material - this layer changes based on the size of your material in all dimensions [“Bounding- Box” (X,Y&Z)]

Contour Cut - This layer deals with 2 dimensional linear elements.

Pocket - This layer is used to remove material within a specified area to an exact depth.

Drill(Size) - This layer uses points to identify where you would like to drill a hole; indicate the diameter of the drill bit.

Topo 3D - This layer is for milling three dimensional surfaces (textures & to topography's.)

Stock Material

The Stock Material layer changes based on the size of your material in all dimensions [”BoundingBox” (X,Y&Z)]. This size reects the material prior to being milled. Creating a “BoundingBox” helps assure that your model ts within your material limits. Please note that the operator may need a border up to an inch in all directions around your model in order to fasten your material to the CNC table, which aects the size of your stock material. Your stock material should be placed at the 0,0 coordinates, as shown below. As always, please see the Fab Lab sta early and often to ensure the proper material size and le set-up.

Stock Material

Your stock material should be placed at the 0,0 coordinates. We work in the positive x and y and in the negative z coordinates.

Material Choices

The material you choose will dictate the “Feeds” and “Speeds” in which the CNCs should be set. These numbers control the RPMs of the spindle, and the IPM (inches per minute) of the carriage. The operators program the correct settings for each le. Please see the following to better understand our constants and to become aware of the limitations your material choices make on our ability to facilitate your project.

Contour Cut

The Contour Cut layer deals with two dimensional linear elements. The opeator can cut on either side of the line as well as set the nal depth of the cut. We also tell the CNC how many passes the cut should make. This information combined with the type of material and tooling used, allows us to set the proper “speed” and “feed” for your individual parts. As always, please see the Fab Lab sta early and often to ensure the proper material size and le set-up.

Contour Cut

Here we have an example of two contour cuts, both outer and inner cut. Adding the extra contour cut allows the operator to execute dierent passes on your part on the CNC . As always please see the Fab Lab sta early and often to ensure the proper material size and le set-up. 

Material Choices

The material you choose will dictate the “Feeds” and “Speeds” in which the CNCs should be set. These numbers control the RPMs of the spindle, and the IPM (inches per minute) of the carriage. The operators program the correct settings for each le. Please see the following to better understand our constants and to become aware of the limitations your material choices make on our ability to facilitate your project.

Pocket

This layer is used to remove material within a specied area to an exact depth. You can think of this subtractive process in terms of “rabbeting” and “dados” although it is not limited to these terms. The operator can determine the specic “feeds” and “speeds” based on nal depth to be cut and the size of the bit used to extract the material. As always, please see the Fab Lab sta early and often to ensure the proper material size and le set-up. We do not allow le remediations to be performed on lab computers. 

Pocket

Here we have an example of a pocket that will be milled to a depth of 3/8” of an inch. The rectangle sets the constants of the pocket (3/4” x 6-1/2”). In Mastercam the operator controls the bit size and depth of each cut.

Material Choices

The material you choose will dictate the “Feeds” and “Speeds” in which the CNCs should be set. These numbers control the RPMs of the spindle, and the IPM (inches per minute) of the carriage. The operators program the correct settings for each le. Please see the following to better understand our constants and to become aware of the limitations your material choices make on our ability to facilitate your project.

Drill(Size)

The Drill(Size) layer uses points to identify where you would like to drill a hole of some individual diameter. (You may choose either 1/16”, 1/8”, 1/4”, 3/8” or 1/2”.) The sta member will use these points and assign the specic drill sizes to program the depth of the hole and the type of drill pattern. As always please see the Fab Lab sta early and often to ensure the proper material size and le set-up. 

Drill(.125)

In this example of drilling we show six points to be drilled through the stock material using an1/8” bit. These particular holes are being used to clear material from the interior corners that will be milled out during the Contour pass.

Material Choices

The material you choose will dictate the “Feeds” and “Speeds” in which the CNCs should be set. These numbers control the RPMs of the spindle, and the IPM (inches per minute) of the carriage. The operators program the correct settings for each le. Please see the following to better understand our constants and to become aware of the limitations your material choices make on our ability to facilitate your project.

Topo 3D

The Topo 3D layer is used for milling 3 dimensional parts. The operators will look over your les and apply the apropriate tool paths and bits. The amount of detail will be determined by the tool size and the overall geometry of your part. As always please see the Fab Lab sta early and often to ensure the proper material size and le set-up. 

Topo 3D

This is an example of a 3D Topo model. From here the CNC operator can determine the best type tool path for the roughing and nishing passes. We will also determine the bit sizes and direction of cut to best suit your model. The materials for a Topo 3D model will determine the degree of finish.

Material Choices

The material you choose will dictate the “Feeds” and “Speeds” in which the CNCs should be set. These numbers control the RPMs of the spindle, and the IPM (inches per minute) of the carriage. The operators program the correct settings for each le. Please see the following to better understand our constants and to become aware of the limitations your material choices make on our ability to facilitate your project.