Enlarge the cylinder blanking dimension by 10mm
Thread Content
If the heat treatment of the head is not thorough enough, rebound will occur, causing the nominal diameter of the head to increase. If the material for the lower cylinder is calculated based on the actual outer diameter of the head and converted to an equivalent mid-diameter, even if there is no excessive misalignment during assembly, the head will rebound due to aging effects during ring weld welding, resulting in a redistribution of stresses in those welds; this in turn leads to significant misalignment after welding. Generally, the dimensions of the cylinder blank are 7–10 mm larger than the actual inner diameter of the head.
You can wait until the end cap has been heat-treated last night before proceeding with cutting it! This situation won’t occur then! That will be more accurate!