In modern manufacturing, the link between design and production depends on clear, accurate documentation. Assembly and part drawings that include dimensions, tolerances, material specs, and bills of materials (BOM) are essential for machinists, inspectors, and suppliers. While many shops use separate drafting packages or ERP systems to create this documentation, Mastercam—one of the leading CAD/CAM platforms—offers powerful tools to generate detailed assembly and part documentation directly within its environment. This integrated approach reduces translation errors, eliminates manual data entry, and ensures that every document reflects the latest design changes.

This article explores the full capabilities of Mastercam’s documentation features. You’ll learn how to leverage annotations, bills of materials, and export functions to create production-ready documentation that keeps your team aligned and your workflow efficient.

Benefits of Creating Documentation Within Mastercam

Integrating documentation creation directly into your CAM workflow delivers several concrete advantages over using external tools.

Immediate Access to Design Details

When you create assembly and part documentation inside Mastercam, every note, dimension, and BOM entry is tied directly to the model geometry. There’s no need to switch between applications or manually re-enter data—everything lives in one environment. This immediacy speeds up the documentation process and reduces the risk of mismatched information between the CAD model and the drawing.

Reduced Need for External Documentation Tools

By using Mastercam’s annotation and BOM generation tools, many shops can eliminate or reduce reliance on standalone drafting software. This consolidation lowers software licensing costs and simplifies training. Operators only need to master a single environment for both programming and documentation.

Enhanced Accuracy with Real-Time Updates

One of the biggest pain points in traditional workflows is keeping drawings in sync with design changes. Since Mastercam’s documentation is linked to the model, any modification to the part geometry automatically updates related annotations and BOM entries (depending on how annotations are placed). This real-time synchronization prevents expensive mistakes on the shop floor caused by outdated prints.

Streamlined Communication Between Design and Manufacturing Teams

Documentation created within Mastercam is inherently understandable to CNC programmers and machinists who already work in the same software. Sharing a Mastercam file that includes both the toolpath and the annotated drawing reduces back-and-forth interpretation. Teams can reference the same file for setup sheets, inspection reports, and assembly instructions.

Improved Version Control and Revision Management

When documentation is part of the Mastercam file, version control becomes simpler. The file itself stores the revision history, and any exported PDF or DXF can be regenerated from the current model state. This eliminates the common problem of having multiple PDF files with obscure naming conventions—everyone knows the Mastercam file is the single source of truth.

Understanding Mastercam’s Documentation Environment

Before diving into the step-by-step process, it helps to understand the key tools Mastercam provides for documentation. These are found primarily in the Annotation and BOM functions, accessible from the Home or File tabs depending on your Mastercam version (2024, 2025, etc.).

The annotation tools let you add dimensions, notes, symbols, callouts, and leaders directly onto your model in the graphics window or on a layout sheet. For assemblies, you can also create a Bill of Materials that lists every component with user-defined properties such as part number, quantity, material, and weight.

Mastercam also supports layers and level sets to organize your documentation elements separately from the machining geometry, keeping the workspace clean and manageable.

Step-by-Step Guide to Creating Assembly and Part Documentation

Follow these steps to generate detailed documentation directly within Mastercam. The process assumes you have a completed 3D model of your part or assembly.

1. Prepare Your Model

Begin by ensuring your model is fully defined and organized. Use Mastercam’s layer and level system to separate components: put all solid bodies for the base part on one layer, fasteners on another, and tooling fixtures on a third. Color-code each component for visual clarity—this helps when you later assign properties for the BOM.

Verify that every component has a unique name or ID, as these identifiers will populate the BOM. If your model includes imported geometry from other CAD systems (e.g., STEP or IGES files), check that the part names are meaningful. You can rename components using the Rename function in the Solids Manager.

For assemblies, consider saving each component as a separate Mastercam file and then using the External Component referencing feature. This keeps file sizes manageable and allows multiple programmers to work simultaneously.

2. Use the Documentation Tools

Mastercam provides several built-in tools for creating documentation. Access them from the toolbar or menu:

  • Annotation – Located under the Home tab, Annotation gives you access to text notes, labels, and leader lines.
  • Dimension – Use the Dimension tool to add linear, angular, radial, and ordinate dimensions to your model. Smart dimensioning picks up model edges automatically.
  • Bill of Materials – The BOM tool is found under the File tab or the Utilities menu (depending on version). It compiles a table of all components in the assembly based on their properties.
  • Layout Sheets – Mastercam’s Layout environment lets you create 2D drawings with multiple views, including front, top, right, isometric, and section views. Annotations placed in the Layout are linked to the model.

3. Insert Annotations and Notes

Annotations are the heart of your part documentation. Add detailed notes directly onto the model or layout sheet, including manufacturing instructions, tolerances, surface finish requirements, and material specifications.

Use callouts and leader lines to point to specific features. Mastercam’s Annotation tool lets you attach a leader to any point on the geometry—just click the feature, drag the leader away, and enter your text. You can customize the arrow style, line weight, and text font to match your company’s drafting standards.

For complex assemblies, add balloons that correspond to the BOM item numbers. Balloons are a type of annotation that automatically reference the component in the BOM. Insert them via the Balloon option, then assign them to a specific component.

Tips for effective annotations:

  • Group related notes together and use leader lines sparingly to avoid clutter.
  • Use layers to separate dimensions from notes; you can toggle visibility as needed.
  • For common callouts (e.g., “BREAK SHARP EDGES .005 MAX”), save them as favorites or in a text file for reuse.

4. Generate the Bill of Materials

The BOM feature automatically compiles all components in your assembly into a structured list. Here’s how to set it up:

  • Go to File > Bill of Materials (or Utilities > BOM in older versions).
  • Select the assembly file or components you want to include.
  • Mastercam will display a table with default columns (Item, Qty, Name, etc.).
  • Customize the columns by right-clicking the table header. Add properties such as Part Number, Material, Description, Weight, and Supplier.
  • To populate these properties, you need to assign them to each component beforehand. Use the Solid Properties or File Properties dialog to enter data like “PART_NO”, “MATERIAL”, “WEIGHT”, etc.
  • Once the BOM table looks correct, you can insert it as a Mastercam entity (table) directly into your layout sheet. The table will update if components change.

For assemblies with many components, consider filtering the BOM to show only specified items or to exclude hardware that you purchase externally. The BOM tool also supports nested levels, so sub-assemblies appear as expandable rows.

Advanced Annotation Features for Detailed Drawings

Going beyond basic notes and dimensions, Mastercam offers advanced annotation capabilities that make your documentation professional and precise.

Geometric Dimensioning and Tolerancing (GD&T)

Mastercam’s Annotation tool includes symbols for GD&T per ASME Y14.5. You can insert feature control frames, datums, and modifiers. Use the Symbol option to choose from a library of GD&T symbols. Place the frame near the dimensioned feature and enter the tolerance values. This is critical for high-precision aerospace, medical, and automotive work.

Surface Texture Symbols

Add roughness, waviness, and lay symbols directly onto surfaces. Mastercam provides a surface texture symbol that you can customize with parameters like Ra (average roughness) value, cut-off length, and machining allowance.

Weld Symbols

For assemblies that require welding, Mastercam includes a set of standard weld symbols (bead, groove, spot, etc.). Place these on the model to indicate joint types and dimensions.

Customizing Bill of Materials Output

The default BOM table is a solid starting point, but you will likely need to customize it to match your company’s format or to export to other systems.

Adding Custom Properties

Define custom properties for each component using the Solid Properties dialog. For example, add a property called “VENDOR” and enter the supplier name. In the BOM, you can then add a column for VENDOR. This is especially useful for assemblies with purchased parts.

Sorting and Filtering

Click the column header in the BOM table to sort ascending or descending. Use the filter icon to show only certain components, e.g., all parts made from aluminum. You can also group components by material or by part number prefix.

Exporting the BOM to Spreadsheet or Database

Mastercam allows you to export the BOM as a CSV or Excel file. Use File > Save As and choose CSV (Comma Separated Values). This exported file can be imported into your ERP, inventory system, or shared with purchasing teams. For dynamic links, consider using Mastercam’s Add-Ons or third-party integration tools that connect directly to ERP systems.

Exporting and Sharing Documentation

Once your documentation is complete, you need to share it with people who may not have Mastercam installed. Mastercam supports multiple export formats.

PDF Export

Use File > Print > Adobe PDF or the built-in Export to PDF function. You can export the entire layout sheet or selected views. PDF retains all annotations, dimensions, and the BOM table as vector graphics, making it perfect for sharing with suppliers or for PDF-based quality inspection.

DXF/DWG Export

For customers or colleagues who use AutoCAD or other drafting software, export the layout as DXF or DWG. Mastercam can map layers and colors to maintain readability. This is useful when the recipient needs to edit the drawing further.

Direct Print

Mastercam can print directly to a plotter or local printer. Scale options let you fit the drawing to a page or print to a specific scale (e.g., 1:1, 1:2). Always do a preview check before sending to a large-format printer.

Best Practices for Documentation Management

To get the most out of Mastercam’s documentation tools, adopt these best practices in your daily workflow:

  • Use a template file – Create a Mastercam template that already contains your company’s title block, logo, default annotation styles, and BOM columns. Save it as a .mcam-template file. Start every new project from this template to maintain consistency.
  • Standardize annotation layers – Set up a standard set of layers for annotations (e.g., Layer 10 for dimensions, Layer 11 for notes, Layer 12 for BOM table). Train the team to always place annotations on the correct layer. This makes it easy to hide or edit specific annotation types.
  • Link properties to model – Fill out part number, revision, and material in the file properties before starting programming. Then, when you generate the BOM, the data is already there. For assemblies, use a consistent naming convention: e.g., ASSY-1001 for the top assembly, and SUB-1001-01 for sub-assemblies.
  • Regularly audit BOMs – Especially in large assemblies, components can be added or removed. After any design change, regenerate the BOM and verify item counts. Use the BOM’s “Update” button to sync with the current model.
  • Version your files – When you release a drawing for manufacturing, save the Mastercam file with a version number (e.g., “BrassHousing_RevB.mcam”). Keep previous versions archived. This is critical for traceability in regulated industries.

Integrating Documentation with PLM/ERP Systems

Many manufacturers use Product Lifecycle Management (PLM) or Enterprise Resource Planning (ERP) systems to manage BOM data and workflows. While Mastercam does not natively sync with every PLM, there are ways to bridge the gap.

Manual export/import – The simplest approach: export the BOM as CSV and import it into your ERP. Many ERP systems accept CSV files for BOM uploads. Automate this with a script or macro if you do it often.

Third-party add-ons – Companies like In-House Solutions offer Mastercam add-ons that sync BOM data to popular ERP systems such as Epicor, SAP, or Microsoft Dynamics. These add-ons can push updates automatically when the Mastercam file is saved.

Using Mastercam’s API – If you have in-house development resources, Mastercam’s API (based on C++ or CHook) can be programmed to interface with your PLM database. This is a high-effort solution suitable for large enterprises with dedicated CAM developers.

Case Study: Streamlining Documentation at a Job Shop

To illustrate the power of integrated documentation, consider the experience of a mid-sized job shop that machined complex assemblies for the agricultural equipment industry. Previously, the shop used separate software (SolidWorks for 3D modeling and a 2D CAD package for drawings) and would manually re-type BOM data into their ERP. This led to frequent errors—once a part number was mis-typed by one digit, resulting in a costly reorder of wrong material.

After switching to Mastercam for both machining and documentation, they implemented the following workflow:

  • Design engineers provided STEP files; the CAM programmers converted them to Mastercam solids and assigned part properties.
  • The BOM was generated directly in Mastercam and exported to CSV, then imported into ERP with a custom script.
  • Annotations (tolerances, notes) were added in Mastercam’s layout sheets, saving time over re-creating them in a separate 2D program.
  • PDF prints were generated from the same Mastercam file that contained the toolpaths, so the setup sheet and the part drawing were always in sync.

The result: a 30% reduction in documentation time, elimination of transcription errors, and improved trust between programming and the shop floor. The shop now produces over 200 new part drawings per month without adding extra staff.

Common Pitfalls and How to Avoid Them

Even with robust tools, certain mistakes can undermine the quality of your documentation. Here are the most common ones and their solutions:

  • Over-annotating the model – Adding too many dimensions and notes directly on the 3D model can make it unreadable. Instead, use layout sheets for production drawings and keep only critical callouts (e.g., setup notes) on the model itself.
  • Not updating the BOM after changes – If you modify an assembly (add/remove components), the BOM table must be regenerated. Mastercam does not always auto-update the table if you inserted it as a static entity. Use the Update BOM command to refresh. Better yet, use dynamic BOM linking if available.
  • Ignoring standards – ANSI, ISO, or JIS drafting standards affect how dimensions and annotations are formatted. Set your Mastercam template to match the standard your customers require. Training every programmer on the correct symbols (surface finish, GD&T) is essential.
  • Poor file management – Saving all components in a single Mastercam file for large assemblies leads to slow performance and high risk of corruption. Use external component references for sub-assemblies. Keep each component file in a structured folder system.

The industry is moving toward Model-Based Definition (MBD), where the 3D model itself serves as the primary source of documentation, replacing traditional 2D drawings. Mastercam supports MBD concepts by allowing annotation of 3D solid models with PMI (Product and Manufacturing Information). While not yet a full MBD solution, Mastercam’s 3D annotations can export to formats like STEP AP242, which many modern inspection systems read.

As Mastercam continues to evolve, expect tighter integration with cloud PLM systems, more automated BOM generation, and improved support for semantic properties (like material grade, heat treat, etc.). Staying current with each release will help you leverage these capabilities.

Conclusion

Creating detailed assembly and part documentation directly within Mastercam transforms a traditional bottleneck into a streamlined, integrated process. By using Mastercam’s annotation tools, bill of materials generation, and export functions, manufacturers can produce accurate, up-to-date documentation that keeps everyone—from the programmer to the machinist to the supplier—on the same page.

Start by preparing your model and organizing it with layers and component properties. Then use annotations to add dimensions, notes, and symbols. Generate the BOM and customize it for your ERP needs. Export the final documentation as PDF, DXF, or directly print it. With practice and a solid template, your team will reduce errors, save time, and build a more reliable documentation workflow.

For more detailed information, refer to the official Mastercam Documentation Portal and the ASME Y14.5 Standard for GD&T. Additionally, explore best practices in CAD/CAM workflow optimization to further improve your manufacturing documentation process.