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If you’re knee-deep in CNC machining tolerances or just trying to figure out how this whole costing thing works, let’s talk about ISO 2768-mK. Sounds intimidating, right? Don’t worry—it’s just a fancy way of saying, “Let’s keep tolerances simple and universal.”
The Dashnode costing engine (your digital costing buddy) assumes all features follow the ISO 2768 general tolerances. Why? Because it keeps calculations straightforward and makes life easier for everyone involved. But what exactly is ISO 2768, and why should you care? Let’s break it down.
ISO 2768 is the global standard that basically says:
"Hey, let’s not overcomplicate things."
Instead of adding custom machining tolerance standards for every tiny feature on your part, you can use ISO 2768 general tolerances to define standard tolerances. These are split into two main categories:
✅ m (Medium): For linear and angular dimensions such as lengths, diameters, chamfers, and angles.
✅ k (Medium): For geometric tolerances like flatness, perpendicularity, and symmetry.
Important Note:
Think of it as the universal "default setting" for tolerances. If a feature doesn’t have a specific tolerance mentioned in your drawing, ISO 2768-mK steps in to save the day.
✅ Saves Time and Arguments
Imagine sending your drawing to the shop floor and getting 15 questions about tolerances. ISO 2768 is like having a pre-set rulebook. No need to spell out every detail—your team already knows what to do.
✅ Keeps Costs Under Control
Super-tight tolerances = super-high costs. ISO 2768-1 and ISO 2768-2 set reasonable limits that are achievable with standard machining processes, so you don’t accidentally pay for rocket-science-level precision when you just need a basic bracket.
✅ Standardization = Peace of Mind
Everyone—from the designer to the machinist—knows what’s expected. No “he said, she said” nonsense. This is why international tolerance standards like ISO 2768 general tolerances exist—to create consistency across industries.
This standard works great for parts where:
✔ The dimensions aren’t mission-critical (think: brackets, casings, or enclosures).
✔ You’re okay with general machining tolerances (nothing too tight or specific).
✔ You want to streamline production without overcomplicating drawings.
However, if you’re designing jet engine components or surgical instruments? Maybe don’t lean too hard on it—those parts need tight, specific tolerances.
The Dashnode costing engine doesn’t want to waste time guessing. By default, it assumes ISO 2768-1 and ISO 2768-mK tolerances for all features, unless you explicitly define something different. Here’s why:
✔ It simplifies calculations.
✔ Keeps everything consistent and universal.
✔ Reduces the time required to generate accurate quotes.
This makes it a powerful tool for CNC machining standards and ensuring standard tolerances in manufacturing without excessive back-and-forth between designers and machinists.
ISO 2768-mK is great for most scenarios, but it’s not a one-size-fits-all solution. Here’s what to watch out for:
⚠ Tight tolerances: If your part needs them, define them explicitly in your drawing.
⚠ Special requirements: Surface finishes, fits, or critical dimensions might need more detailed specifications.
ISO 2768-mK is like the unsung hero of tolerance. It keeps things simple, saves time, and helps you avoid unnecessary costs. By understanding and using it effectively—like the Dashnode costing engine does—you can streamline your CNC machining tolerances without sacrificing quality.
For more insights, explore our in-depth guides:
Now, go forth and conquer your next CNC machining project with confidence! 🚀
