| Finished-unit dimensional control — illustrative example |
| Length | Specified: 15.625 in. (15 5/8 in.) Permitted range: 15.500–15.750 in. | Illustrative reading: 15.690 in. Deviation: +0.065 in. | Within ±0.125 in. tolerance |
| Width | Specified: 7.625 in. (7 5/8 in.) Permitted range: 7.500–7.750 in. | Illustrative reading: 7.600 in. Deviation: −0.025 in. | Within ±0.125 in. tolerance |
| Height | Specified: 7.625 in. (7 5/8 in.) Permitted range: 7.500–7.750 in. | Illustrative reading: 7.700 in. Deviation: +0.075 in. | Within ±0.125 in. tolerance |
| Measurement plan | Measure finished units against the specified dimensions and applicable project requirements. | Ask how the supplier recommends sampling units from a production run and recording results. | Confirm the plan includes suitable measuring tools, repeatable measurement locations, and retained records. |
| Machine-selection checks |
| Mold and product changeover | Mold configuration must suit the required unit type, dimensions, and production range. | Can the mold be changed and aligned using documented setup instructions? | Request a demonstration of setup and a dimensional check after changeover. |
| Vibration and compaction settings | Settings should be adjustable and repeatable for the selected mix and product. | Can operators record and restore the settings used for an approved production run? | Look for clear controls and a repeatable operating procedure; verify results with finished-unit measurements. |
| Electrical requirements | Power supply must match the installation site and the machine’s electrical documentation. | Confirm required voltage, phase, frequency, and connected load with the supplier. | Have a qualified electrician verify site compatibility before purchase and installation. |
| Production capacity | Compare demonstrated output for the specific unit and operating conditions—not a headline maximum alone. | Ask what cycle time and daily output are achievable with the chosen mold, staffing, and curing workflow. | Request a product-specific production trial and clarify what is included in the stated output. |
| Quality records and support | Consistent production requires documented setup, inspection, maintenance, and operator training. | Ask for sample inspection forms, maintenance instructions, and training details. | Choose a supplier that can explain how to troubleshoot dimensional variation and maintain production records. |