CAD File Prep Information

Material Saving

Laser cutters 1 and 2

AutoCAD drawings for laser cutting

Maximum cutting extents are 800mmx450mm. Always check material stocks before planning your drawings.

How to prepare your drawing file

  1. Scale the drawing to fit on the laser machine by reference or with a plot window from the Plot Setting dialogue box. A good way to start is to draw a 800mm x 450mm box on your drawing and design your components to fit within those constraints to avoid any parts being too big to cut.
  2. Explode all Blocks and join all lines into polylines to reduce the overall number lines that the computer needs to process. Typing the ‘OVERKILL’ command into AutoCad will help find any duplicate lines.
  3. Set the drawing on two layers one for cutting (Red) the other for etching (Blue). Set a red layer 1 for cutting and a blue layer 5 for etching. A White layer (Black on illustrator) can be used to for deep engraving (be aware that this can be time consuming).
  4. Ensure that all line weights are set at 0.05 (this can be changed in the selctions properties menu on AutoCad)
  5. Before outputting your drawing from AutoCAD make sure you have done the following to a drawing before plotting. Save as a .DWG or .DXF 2010 or above file format.
  6. Plot the file from AutoCad from the workshop machine when it has been checked by a member of staff.

Common Issues when preparing files for Laser Cutting

Issue: The job is appearing as Black lines when plotted despite the layering and line colours being correct.

Possible Cause: Line Weighting is wrong. Go to the line properties menu (right click) and change the lineweighting to 0.05)

Issue: Lines or objects cannot be changed to correct line weight or colour

Possible Cause(s):

1. The lines are grouped and must be exploded in order to select lines individually.

2. Objects are constrained. Remove constraints by typing ‘DELCONSTRAINT’ then apply correct line-weighting and colours to the object/lines in question.

Issue: The job preview appears blank when It has been plotted.

Possible Cause: The Job is not scaled correctly or the plot window is places incorrectly.

Scale factors from CAD software

1:1 – no change

1:2 – 0.2

1:10 – 0.1

1:20 – 0.05

1:50 – 0.02

1:100 – 0.01

1:200 – 0.005

1:500 – 0.002

1:1000 – 0.001

1:1250 – 0.0008

1:2000 – 0.0005

Applications for Laser 1 & 2

Deep engraving – Non-contact engraving & cutting – Drilling – Precision scribing – Mask production – Prototyping – Sign making – Architectural model making – Component marking – Film/overlay cutting – Textile cutting – Gasket cutting – production – Rubber stamps & seals – Membrane switches- MDF-plastics up to-12mm and plywood cutting up to 6mm.

CorelDraw files and illustrator file formats can also be used.

Bed Size 800mm x 450mm

£10 Per hour of use


2-1

Graphtec Flat Bed Plotter

This machine allows you to cut paper and thin card (only material provided or approved for use by workshop staff!) from CAD drawings. This machine is particularly useful for net shapes that can then be folded along score lines and assembled without scorching that can occur when laser cutting.

How to Prepare your Drawing File

Drawings can be plotted from either AutoCAD or Adobe Illustrator.

When using AutoCAD:

  1. Ensure the drawing is correctly scaled to fit within the maximum bed size of 900mm x 600mm.
  2. Your drawing must be on no more than two different colour layers. One colour for cut lines and one for scoring. (Colours do not matter as long as they are different for each outcome)
  3. All lines must be set to have a 0.05mm line weight (properties menu, line weight)
  4. Explode all blocks and join all lines into polylines to reduce the overall number lines that the computer needs to process. Typing the ‘OVERKILL’ command will help find and remove any duplicate lines.
  5. Drawing must then be saved as a .DXF file before plotting.

When using Adobe Illustrator:

  1. Ensure the drawing is correctly scaled to fit within the maximum bed size of 900mm x 600mm.
  2. Your drawing must be on no more than two different colour layers. One colour for cut lines and one for scoring. (Colours do not matter as long as they are different for each outcome)
  3. Lines should be basic type and the stroke set to 1 pt.
  4. The drawing is then ready for printing from illustrator.

Once your drawing is ready consult a member of staff to begin plotting.

Maximum drawing size can be 900mmx600mm


2nd year Technologies Detail Models (10)

3D Printers

Be careful here! The model is only as good as your understanding of the appropriate application of this process. Misuse is becoming increasingly common and we urge you to think about how and way you are using this process within your work.

For more information about 3D Printing models – the different types and applications please take time to read a full guide to 3D Printing at B.15 by clicking here.

Cost is calculated using completed 3D Model File in the workshop. There are no ‘overhead’ costs to any type of 3D printing at B.15. Your jobs are charged at cost of the materials alone at the price they are sold to us by the manufacturer. We are particularly conscious of the misuse of these machines and will thoroughly check your proposals before approving the use of any of the machines so allow time for this.

The machines work from .STL file format and your model must be a solid object not a collection of surfaces. To save the file as an.STL from your chosen modelling software you must export it and if given the option save as Binary.

After you scale the model we recommend that you check that objects component parts are not smaller than 1.5mm thick, anything smaller will be fragile and potentially not print properly.

Checking your files

We recommend checking your file for flaws by running it through this free online checker. You will need to sign up before being able to upload files for checking and conversion to SLT format if necessary. https://makeprintable.com/

HP ABS Printer. Build area 203mm x 150mm x 203mm High

Note that this bed size smaller than the same model ABS  printer located in the MMU Chatham CAD Suite. Models made to the full extents of this machine size may need to be reduced or broken up to suit the machine in B.15..

Z-Corp Powder Printer. Build Area 203mm x 253mm x 203mm High

Projet 360 Printer. Build Area 203mm x 254mm x 203mm High


2013-12-12 11.20.58

CNC Router

Operation time can vary depending on the complexity and type of CAD file used.Please consult us with your ideas before going too far into the process of modelling for this method of manufacture.

Models produced can be either profile line drawings saved as .DXF or as relief models saved as a .3DS file.

Specification Details

Work piece size: 900mm x 840mm x 90mm

Standard Cutting routers are 3mm Ball Nose, 3mm Slot Cutter, 6mm Ball Nose and 6mm Slot Cutter. 45 Degree cuts can be achieved with a ‘V’ Bit cutting tool.

Materials
Wood, Foam, Acrylic, Ureol Chemi Wood

Software compatibility/file type: 

.dxf(2D), .3ds(3D), Artcam

There is no time charge for using the CNC.

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