Where should your shop limits live?
Your router has a bed size. Your sheets have a thickness. Your smallest cutter sets the tightest internal corner you can cut. A parametric model knows none of this unless someone tells it.
So where do those limits live in your shop, and who updates them when something changes?
There are three main options. Each works up to a point. Each has a cost.
1. Inside each definition
The limits are built into the definition itself: slider bounds, hard-coded values, a cluster that checks panel sizes against the bed. Each definition carries its own copy.
This is quick, and every file is self-contained. For a single product it works well.
The cost comes with the second and third definition. The bed size now lives in several places. When the shop changes something, say a new ply that measures 18.3 mm rather than 18, someone has to find every copy and update it. Miss one, and that definition keeps generating parts for a sheet you no longer stock. Over time, copies drift apart, and nobody outside the file can see which limits it assumes.
2. With whoever runs CAM
Designers model freely, and the person preparing the job knows what the machines can take. Experience catches what the file doesn’t.
This is flexible, and an experienced CAM lead catches a lot. But the check happens at the end. With this setup, an out-of-limit size can only be caught at CAM prep, after someone has drawn it, and goes back to be redrawn. If it’s missed there, it surfaces as scrap.
It also means the shop’s knowledge sits with one or two people. If your CAD/CAM lead is off for a fortnight, who checks the new variants?
3. Once, as data
The limits are recorded in one place, separate from any definition. Each configuration is checked against the limits that apply to it. A part longer than the bed is flagged. So is an internal corner tighter than the smallest cutter can cut. Each flag says which limit it broke.
Change a limit once, and every connected product is checked against the new value. The limits are visible to anyone who needs them, not buried in a file or a person’s memory.
This has costs too. Someone has to record the limits in the first place, and keep the records current when the shop changes. And it can only check what has been recorded: a limit that never made it into the data can still reach the shop, so output still needs checking before cutting.
You can build a version of this yourself. A shared spreadsheet or data file that several definitions read from is a real step forward from copies in every file. The questions to answer are how each definition finds the limits that apply to it, and how you know which record a flag came from.
Questions to ask about your own setup
- Change. When a new material arrives, how many places need updating, and how do you know you’ve found them all?
- Visibility. Where is your bed size written down? Could someone new find it without opening a definition or asking a colleague?
- Timing. When does an out-of-limit size usually get caught: when it’s chosen, when it’s drawn, or at CAM prep?
- Cover. If the person who knows your machines is away, who checks new variants? If the answers are “several”, “no”, “CAM prep” and “nobody”, your limits are probably living in more places than they should.
Where Datafurn fits
Datafurn takes the third approach to storing limits: your machines, tools and stock are recorded once, as data, separate from your definitions.
That data stays part of the design while it changes. Materials, machines and tools are inputs alongside the dimensions, each with its recorded values, such as the measured thickness of a sheet. As you change a size, swap a material or pick a different cutter, each change is checked against those values. Anything you can’t make is flagged with the reason, such as a part longer than the bed, and the flags update as the design does.
It doesn’t replace the check at CAM prep, and it doesn’t check geometry made another way. It moves the limits to one place, so problems can be found with every change, not only when someone prepares the job.
We’re recruiting 3–5 manufacturers cutting sheet materials on 3-axis flatbed routers for our Stage 1 pilot. If you use Grasshopper, we connect Datafurn to one of your existing definitions. If you don’t, we build a model for one product family. Either way, we do the setup.