CNC Machining Cost & Time Estimator Community

What this tool does

Quoting a machined part means answering four questions: how much material, how long on the machine, how much setup and programming, and what margin. This estimator builds the answer from the physical basics. Give the stock size and finished part volume and it computes the material removed; divide by a roughing removal rate for your material (pre-filled for aluminium, steel, stainless, titanium, brass, copper, plastics and wood) for the roughing time; add finishing time from the surface area to finish and a rate in cm²/min; then extra operations, loading and inspection.

How to use it, step by step

1. Pick the material and enter stock and part volume.
2. Set finishing area, extra operations and setups.
3. Adjust machine, operator and margin rates.
4. Read the price per part and quantity table.

Tips from the guide

• Use your real MRR from tooling data rather than defaults.
• Reducing setups (one-op parts) often saves more than faster cutting.
• Quote small batches with the setup included; offer quantity breaks.
• Add a contingency for tight tolerances and surface finishes.

Common mistakes to avoid

• Forgetting setup and programming for single pieces.
• Using one machine rate for all machines.
• Ignoring tool wear on hard materials.

Who uses it

• Makers and small shops. Quote jobs consistently.
• Engineering students. Understand the cost drivers of subtractive manufacturing.
• Startups. Budget for prototype and small-batch machined parts.

How to ask a question people can answer

A good thread on the CNC Machining Cost & Time Estimator saves everyone time. Start with a title that names the exact problem, such as the input you used, the result you expected and the result you got. A title like “Not working” is hard to answer, while a title with the specifics gets replies quickly.

• Say what you tried. List the steps you followed and any settings you changed, so replies do not repeat what you already did.
• Share a small example. A short sample input and the output you saw is worth more than a long description. Remove anything private first.
• Mention your setup. Your device, browser and whether you are on a phone or a computer can explain many odd results.
• One question per thread. Separate topics get clearer answers and are easier to find later with the search box above.
• Come back and reply. If a suggestion worked, say so and upvote it, and if you found the fix yourself, post it for the next person.

Community rules

Be kind, stay on topic and keep personal data out of your posts. Do not post adult, hateful or illegal content, advertising or repeated links. Every post is shown with its author’s username and date, and posts that break these rules can be hidden by moderators. This space is for help with the CNC Machining Cost & Time Estimator and related tasks, and it is separate from the sitewide discussion forum where broader topics live.