Drawings

Introduction

The drawing setup, numbering and dimensions is a very important part of the design process.

The drawing It is the way you ultimately communicate your design to the manufacturing team. It is also the only piece of information you have to check the manufactured part against.

We design our robot in Onshape. The Onshape self learning has a module for drawings Fundamentals 6: Detailed Drawings.

You will need to go through this module to understand how drawings are set up using the default template.

Fabrication Process

Any information on the manufacturing process can be found on the "Fabrication Process" page in the Drawings folder. This page indicates the necessary information surrounding the steps from CAD to Manufacturing. This can also be accessed though:

Drawing Setup

Drawings are filed in the Onshape model under a drawing tab. You may need to create additional tabs for sub-assemblies, this will make a easier to find the relevant drawings.

  1. Click the + symbol and add a new drawing using The Drop Bears templates;
    1. YYYY <Game Name> TDB-A4 Drawing Template
    2. YYYY <Game Name> TDB-A3 Drawing Template
  2. The drawing is created out of the assembly tab with the required views to allow for dimensions to be shown;
    • Front
    • Left
    • Top
    • Isometric
    • Other views as required
  • All further drawings associated with the assembly/subassembly are created in additional sheets.

Annotations and view labels,

Ensure that each view has a label for;

    1. Name of view
    2. Scale of view

Add notes for any special instructions

Dimensions

Ordinate dimensions use a single witness line with no leader, and are associated with a baseline reference, shown in the following figure as "0". All dimensions that reference the same baseline share a common plane or edge.

Dimensions should be from one edge of defined point and for each hole etc.

Add only the required dimensions, there is no need to dimension the thickness of the material if it is stock.

Define the Tolerances on the drawing and ensure that there are no unnecessary decimal places in your design unless required by the part that needs to interface (such a bearing).


Drawing Numbering

Drawing numbering identifies the part, assembly and sub assembly.

Each part should have a part number. If the part is from a supplier, use the part's supplier number. For internally created parts use the following numbering scheme:

<insert drawing numbering requirements>

For current 2019 Deep Space Season we have

Drive Base: 2019-DSP-0000 > 0099

Hatch: 2019-DSP-0100 > 0199

Climber: 2019-DSP-0200 > 0299

Cargo: 2019-DSP-0300 > 0399


Drawing Title block

The drawing title block is completed by direct entry into the fields or is referencing from entries form property dialogues.

Sheet Numbering

This is the number of sheets in the sub assembly or the assembly drawing set.

Change the number of the sheets and the total number of sheets depending on the sub assembly sheet numbers.

Scale

The scale of the drawing is set in the sheet property dialogue (right click anywhere in the drawing and select Sheet Properties)

Drawing Title

The drawing title identifies the part, the sub assembly and the assembly and is entered in the drawing properties (right click on the drawing name tab).

This will then show up in the title block


Drawn

This field is completed by the person who has created the drawing and is done when the drawing is set up.

Checked

This field is completed by the person who has checked the drawing and is signed off on paper.

Approved

This field is completed by the person who has approved the drawing for manufacture and can only be completed on paper. This will then become the official ‘Approved for Production’ drawing.


Drawing Checklist

Go through the drawing checklist once you have finished with the drawing and check that the drawing has been produced to the drawing standards.

Printing

Drawings are printed out in A4 or A3. When printing from laptop or desktop select no scaling, full size or print orgininal size.

Hard Copies

Drawings are filed in the drawing QA folder.