How to install CAM Assist in Mastercam 2025, 2026 or 2027, find it on the ribbon, open a demo part, and what to do if it doesn't load.
Supported versions
| Mastercam version | Installer |
|---|---|
| 2025 | CAM Assist 2025 |
| 2026 | CAM Assist 2026 |
| 2027 | CAM Assist 2027 |
Download the installer from the CloudNC download page: select Mastercam, choose Standard (or GovCloud if your plan includes it), then click CAM Assist 2.0 for Mastercam 2025, 2026 or 2027. Each installer works with one Mastercam version only. If you use more than one version, install each one.
Install
- Close Mastercam.
- Run the installer for your Mastercam version and follow the steps.
- Open Mastercam.
Find CAM Assist
Open the CloudNC tab on the ribbon and click CloudNC CAM Assist (CloudNC CAM Assist for GovCloud (US) on GovCloud) to open its menu, then click CloudNC CAM Assist in the menu. The menu also has Help Center, Open a Demo Part and About CAM Assist.
The first time you run it, CAM Assist opens your browser to sign in to your CloudNC account.
Cutting Parameters Explorer isn't on the ribbon. Open it from an operation in the Toolpaths Manager. See Cutting Parameters Explorer problems in Mastercam.
Open a demo part
- On the CloudNC tab, open the CloudNC CAM Assist menu.
- Click Open a Demo Part and choose a part.
If Mastercam is set to inches, the inch version of the demo part opens.
If you see "File not found … please contact CloudNC" or "Failed to open … please contact CloudNC", the demo files are missing or damaged. Reinstall CAM Assist for your Mastercam version.
If the CloudNC tab is missing
CAM Assist builds the CloudNC tab when Mastercam starts. If it can't find its files, the tab doesn't appear and no message is shown.
- Check you installed the CAM Assist installer for the Mastercam version you're running. CAM Assist for Mastercam 2026 doesn't load in Mastercam 2025 or 2027.
- Restart Mastercam.
- If the tab is still missing, run the installer again.
If buttons show text like ribbon_tab_cloudnc instead of their names, the installation is incomplete. Run the installer again.
If you see "Error loading add-in"
Error loading add-in. Error code: <code>. Message: <message>.
| Message includes | What to do |
|---|---|
| "Open Cutting Parameters Explorer from an operation in the toolpath manager" | Nothing is wrong with the installation. Select an operation in the Toolpaths Manager first. See Cutting Parameters Explorer problems in Mastercam. |
| Anything else | Run the installer again and restart Mastercam. If you still see it, contact CloudNC support with the error code and message. |
If the CAM Assist window doesn't open
Before the window opens, CAM Assist checks the part. Each check shows its own message:
- "File will be saved, do you want to continue?": see Save the part when starting CAM Assist in Mastercam.
- A message about machine groups, stock, Master Models or mesh bodies: see CAM Assist won't start in Mastercam.
If no message appears and the window never opens:
- Close Mastercam and open it again, then click CloudNC CAM Assist.
- If it still doesn't open, run the installer again.
Still not working?
If you've done all of the above, contact CloudNC support. Include any error code and the log files from %ProgramData%\CloudNC Ltd\CAM Assist\logs.