---
title: "Can a Warm Aluminium Part Pass a Bore Check and Fail After Cooling?"  
description: "Can a Warm Aluminium Part Pass a Bore Check and Fail After Cooling?"  
author: "Nisha Gurung"  
published: 2026-10-19  
canonical: https://answers.mindstick.com/qa/117904/can-a-warm-aluminium-part-pass-a-bore-check-and-fail-after-cooling  
category: "Mix Category"  
tags: ["manufacturing", "Metrology", "CNC machining", "quality control"]  
reading_time: 1 minute  

---

# Can a Warm Aluminium Part Pass a Bore Check and Fail After Cooling?

We’re checking a machined aluminium housing with a bore specified at **25.000–25.010 mm**. Some parts pass the shop-floor check shortly after machining but measure below the lower limit after spending time in the inspection room.

The parts can be around 30°C at the first check; the inspection room is maintained near 20°C. Before adjusting the machining offset, I want to understand whether **thermal expansion in dimensional inspection** could account for a meaningful part of this difference.

### Which temperatures need to be controlled?

Is it enough to let the housing cool, or do the gauge and its setting master also need to stabilise? We use a bore gauge for the recorded measurement and a steel plug gauge for a quick check, so I’m unsure how their different materials affect the comparison.

How would you establish a repeatable inspection method that separates temperature effects from actual bore-size variation?


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Original Source: https://answers.mindstick.com/qa/117904/can-a-warm-aluminium-part-pass-a-bore-check-and-fail-after-cooling

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