Day three of commissioning: payload checked, the comparison table picked a tier, the PO is signed. The first production shift still hits protective stops—the tray station that looked covered on the spec sheet never cleared the critical pick angle. Most surprises trace back to the same pre-purchase gaps, not the robot brand.
This is a quick audit before you quote: five mistakes that show up on almost every project, what breaks on the floor, and where to go deeper.
Five mistakes that change projects
| Mistake | What breaks on the floor | Next step |
|---|---|---|
| Part weight only — EOAT and dynamics ignored | Drops, protective stops, takt drift | Part + EOAT + rated headroom → https://roooll.com/en/insights/guides/choose-right-payload |
| Catalog reach on paper — TCP, pose, and cabling skipped | Key pose unreachable at commissioning | TCP + critical pose + retract path → https://roooll.com/en/insights/guides/how-to-calculate-cobot-reach |
| Robot picked before the hand — EOAT path undecided | First cycle slips or cannot meet takt | Pick grip / vacuum / fixture path first → https://roooll.com/en/insights/guides/how-to-choose-cobot-end-effector |
| Peak treated as daily load | Stable in demo, unstable in production | Use rated payload for everyday cycles → https://roooll.com/en/insights/guides/choose-right-payload |
| Three spec stories — teams never aligned on one link | Procurement, engineering, and floor quote different numbers | Share one comparison URL before PO → https://roooll.com/en/insights/guides/side-by-side-comparison-tool |
When mistakes stack: one floor vignette
A PCB tray pick at a ~900 mm station: the team short-listed r-Core because catalog reach cleared the center distance. Vacuum tooling and valve stack added TCP extension; a side approach meant the wrist could not stay extended; cable dress burned margin before the arm hit its limit. Each item looked fine alone—combined, the cell needed rework. The lesson is not pick a bigger arm first—it is validate the worst beat, not the best-case dimension on the PDF.
Three-minute pre-quote audit
| Check | Why it matters |
|---|---|
| Worst-case TCP load = part + EOAT + dynamic margin (rated, not peak) | Stops drops and repeat protective halts |
| Critical pick/place pose checked with EOAT envelope | Paper reach ≠ usable reach |
| EOAT path chosen or marked TBD on site | Hand and arm get quoted together |
| One comparison link shared with procurement, engineering, and floor | One spec story before PO |
| Tool I/O and safety scope noted in the quote package | No surprise cabinet or PLC work |
Next step
Still between r-Lite / r-Core / r-Max? Start with the Product Advisor: https://roooll.com/en/selector/advisor
Lock payload, reach, and flange fit in one Side-by-Side Comparison link: https://roooll.com/en/selector/comparison
Send a layout or sample parts—we will help validate real constraints: https://roooll.com/en/contact
