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| alliedhightech:mcmaster [2021/04/23 23:01] – mcmaster | alliedhightech:mcmaster [2021/04/24 18:03] (current) – 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 | ||
| + | |||
| + | ===== 2021-04-24 ===== | ||
| + | |||
| + | Continue lapping | ||
| + | same settings | ||