delayer:abrasive
Differences
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| delayer:abrasive [2012/02/21 01:48] – created mcmaster | delayer:abrasive [2013/10/20 14:59] (current) – external edit 127.0.0.1 | ||
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| - | ====== Lapping ====== | ||
| - | |||
| - | Used by some professional shops (Flylogic claims to use it as well as wet etching). | ||
| - | *Procedure** | ||
| - | * Apply very fine abrasive (optical polishing compound, <100nm grit is ideal) to turntable of some sort | ||
| - | * Gently press die against turntable, checking periodically if layer is fully removed | ||
| - | *Advantages** | ||
| - | * Safe | ||
| - | * Very flat surface | ||
| - | * Moderate cost | ||
| - | *Disadvantages** | ||
| - | * Requires precision abrasives which may be expensive | ||
| - | * Labor intensive | ||
| - | |||
| ====== Sanding ====== | ====== Sanding ====== | ||
| - | *Procedure** | + | Procedure |
| * Secure (glue) die to surface | * Secure (glue) die to surface | ||
| * Use fine sandpaper (1200+?) to remove a layer | * Use fine sandpaper (1200+?) to remove a layer | ||
| * Using polishing paste, Dremel polish layer to photographic quality | * Using polishing paste, Dremel polish layer to photographic quality | ||
| - | *Advantages** | + | |
| + | Advantages | ||
| * Materials readily available | * Materials readily available | ||
| * Safe (for user) | * Safe (for user) | ||
| * Low cost | * Low cost | ||
| - | *Disadvantages** | + | |
| + | Disadvantages | ||
| * May not be as repeatable as chemical etching | * May not be as repeatable as chemical etching | ||
| * Labor intensive | * Labor intensive | ||
| * Risky, easy to grind too far | * Risky, easy to grind too far | ||
| - | *Notes** | + | |
| + | Notes | ||
| * Nohl used Dremel + sandpaper for his MiFare Classic attacks according to CCC talk | * Nohl used Dremel + sandpaper for his MiFare Classic attacks according to CCC talk | ||
delayer/abrasive.1329788903.txt.gz · Last modified: 2013/10/20 14:59 (external edit)