Insights
First Article
A simple note on proving the first part properly before you run the rest of the sheet.
The first finished part tells you whether the drawing, stock, workholding and toolpath agree. First Article is our note on checking that one piece properly before you commit more board, billet or time.
First Article starts after the first complete part comes off the bed and before the next sheet is loaded. Measure that piece against the drawing, check edge quality, and note whether the cutter pushed, burned, chipped or packed dust in the slot.
Checks on the first finished part
- Overall size checked against drawing
- One photo of the first cut edge kept with the job record
- Program version or file name written beside the part
- Tool diameter, material, and zero point noted clearly
A first article is not only about dimensions on a caliper. It also shows whether the stock is flat enough, the hold-down is steady, and the chosen feeds suit the cutter in that material. On a desktop CNC, those small setup details decide whether the second part repeats properly.
Before the next sheet goes down
First Article is about proving the first part before the rest of the sheet goes on the machine. We look at fit, dimensions, and cutter behaviour early, so a repeat run starts from something you trust.
Start by checking the basics that are expensive to miss later. MDF can swell slightly, plywood can vary across one board, and aluminium will show chatter quickly if the setup is light or the stick-out is too long. Those are first-part problems, not end-of-run surprises.
Then test the fit items that matter to the job itself. Tabs, pockets, slot widths, hole sizes, and outside profile all need a look before a repeat run begins. One accurate sample part is more useful than a stack of identical wrong ones.
What the first article should reveal
The aim is to learn where drawing, stock, workholding and toolpath agree, and where they do not. Sometimes the fix is a zero check, sometimes it is a cutter change, and sometimes the board itself is the issue. Treat the first part as evidence, not ceremony.
Keep the marked sample, the measurement notes, and one photo together with the job information. If you discuss a similar issue, include the material name, cutter size, and what failed on the first part. That makes the problem easier to place than a general machine description.
- Measured part kept as reference
- Edge finish checked before repeat cutting
- Notes recorded with the job file
Bench conditions that change results
South African workshop conditions can shift what a first article tells you. Humid coastal air, dusty inland spaces, and shared bench setups all affect hold-down, cleanliness, and repeatability. On small-format machines, that context matters because a slight change in stock or clamping shows up quickly in the cut.
Power cuts also change how people plan a run. It makes sense to prove one part fully before committing a full sheet of MDF, birch ply or plastic to the table. When machine time is limited, the first article protects material and avoids repeating an error across the whole job.
Operated by Astros Marketing (Pty) Ltd from 2 Makro Place, Sunnyrock 1401.
Records worth keeping with the sample
A simple note on proving the first part properly before you run the rest of the sheet.
Write down the cutter used, spindle or router setting, pass depth, zero position, and any dimension that needed attention. Add the drawing revision if there was one. Later, when the same part is run again for class work, prototyping or small production, those notes stop guesswork from creeping back in.