alliedhightech:start
Differences
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| alliedhightech:start [2021/04/23 17:38] – mcmaster | alliedhightech:start [2021/04/23 22:42] (current) – mcmaster | ||
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| They make some nice machines. | They make some nice machines. | ||
| - | ====== | + | [[mcmaster|McMaster notes]] |
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| - | ===== 2021-04-21 ===== | + | |
| - | + | ||
| - | * Goal: set RP2-B0 in wax on Allied sample holder | + | |
| - | * RP2-B0 | + | |
| - | * Decapped 2x " | + | |
| - | * Around 277 um thick. Later measurement 281 um | + | |
| - | * Sacrificial dies | + | |
| - | * Samsung k4h560438e-tcb0 | + | |
| - | * 324 um | + | |
| - | * Area | + | |
| - | * Samsung: 5.3 x 11.1 = 58.8 mm2 | + | |
| - | * RPI: maybe 4 mm2 | + | |
| - | * Net: maybe 60 mm2 | + | |
| - | * Etchant: 20% w/v KOH in water | + | |
| - | * https:// | + | |
| - | * Approx 250 um / hour heated => 4.15 um / min | + | |
| - | * Etch | + | |
| - | * Etch 1 | + | |
| - | * 25 min @ 177F hotplate | + | |
| - | * 306 um | + | |
| - | * Etch 2 | + | |
| - | * 30 min? | + | |
| - | * raised temp? | + | |
| - | * 297, 302 um | + | |
| - | * High spots forming (was warned might be uneven at this conc) | + | |
| - | * Etch 3 | + | |
| - | * Now hotplate at 220F | + | |
| - | * 286 um, 291 um | + | |
| - | * 14 um in 30 min | + | |
| - | * (286 - 277) * 2 = 18 more min? | + | |
| - | * Lots of metal flaking off | + | |
| - | * Etch 4 | + | |
| - | * 20 min | + | |
| - | * Ultrasound. Lots of stuff flaked off | + | |
| - | * Didn't note final thickness... | + | |
| - | * Check all dies for thickness before mounting | + | |
| - | * Not all started at exactly the same time, although was close | + | |
| - | * Order replacement lapping gauge | + | |
| - | * 543-452B, ID-C125EB | + | |
| - | * 1 um resolution | + | |
| - | * 25 mm travel | + | |
| - | * Long | + | |
| - | * Flat carbide tip. Will need to switch to new unit | + | |
| - | * Skips | + | |
| - | * Can't modify spares to be long enough | + | |
| - | * One that might work I can't get to power up. Completely broken? | + | |
| - | * Set in wax | + | |
| - | * 0.4 mm gap in area(s). Not ideal but may still work | + | |
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| - | ===== 2021-04-23 ===== | + | |
| - | + | ||
| - | Goal: setup lapping machine, lap RPI chip from other day | + | |
| - | + | ||
| - | TODO: | + | |
| - | * Level head | + | |
| - | * Review Allied recommendations | + | |
| - | * Characterize um / rev | + | |
| - | * Gauge skips, but is stable over say 1 mm | + | |
| - | * Setup slurry feed | + | |
| - | * Can I make this nicer? | + | |
| - | + | ||
| - | Inventory: | + | |
| - | * 2x MultiPrep systems w/ arm | + | |
| - | * Both were surplus / in bad condition | + | |
| - | * One is more "ready to go" | + | |
| - | * Lots of lapping disks | + | |
| - | * Is my old colloidial silica still good? | + | |
| - | + | ||
| - | Notes: | + | |
| - | * Installed old magnetic polishing cloth | + | |
| - | * | + | |
| ====== Parallel polishing ====== | ====== Parallel polishing ====== | ||
alliedhightech/start.1619199528.txt.gz · Last modified: 2021/04/23 17:38 by mcmaster