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alliedhightech:mcmaster [2021/04/23 23:01] – mcmaster | alliedhightech:mcmaster [2021/04/23 23:46] – [2021-04-23] mcmaster | ||
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* Post 1.49" | * Post 1.49" | ||
* Could I mount stopcock to it somehow? | * Could I mount stopcock to it somehow? | ||
- | * Main crank 40 TPI? | + | |
+ | * Pointed inside | ||
+ | * About 30 um variation | ||
+ | * Good enough for now: not great but not terrible | ||
+ | | ||
+ | * Wheel is marked in um (635 um) | ||
+ | * Allied-Parallel-Lapping-Integrated-Circuits.pdf | ||
+ | * If gauge is moving its already too much pressure | ||
+ | * Instead use recommended distances | ||
+ | * Based on 500 um die | ||
+ | * Imperial Polishing Cloth, # | ||
+ | * 277 um die => 724 + 277 = 1001 um offset? | ||
+ | * Sample load set to full | ||
+ | * Using spare holder to measure | ||
+ | * Distance from Platen to bottom of polishing fixture = Ts - Tc - Td + 0.116 mm | ||
+ | * Ts = Spacer thickness (0.500" | ||
+ | * Tc = Cloth Thickness | ||
+ | * Td = Die Thickness | ||
+ | * So... | ||
+ | * Ts: 12.65 mm | ||
+ | * Tc: 0.840 mm | ||
+ | * Td: 0.277 mm | ||
+ | * Net: 12.65 - 0.840 - 0.277 + 0.116 = 11.649 | ||
+ | * ...but I'm using magnetic sheet. Not the same | ||
+ | * 50-500-500 instead of 50-150-500 | ||
+ | * Magnet: 735 um | ||
+ | * Cloth: 450 um (840 um official) | ||
+ | * Let's use official number | ||
+ | * 12.65 - 0.840 - 0.735 - 0.277 + 0.116 = 10.914 mm | ||
+ | * Crank: 25.4 / 40 = 0.635 mm | ||
+ | * 10.914 / 0.635 = 17.2 cranks | ||
+ | * Remainder: 0.119 mm | ||
+ | * Settings | ||
+ | * 225 RPM CCW | ||
+ | * Rotation: full speed (8) | ||
+ | * Osc: 3 | ||
+ | * 0.05 um silica | ||