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decap:ceramic [2019/12/09 07:31] – [Bandsaw] mcmaster | decap:ceramic [2019/12/17 03:07] – [Bandsaw] mcmaster | ||
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===== Bandsaw ===== | ===== Bandsaw ===== | ||
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+ | {{: | ||
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+ | Above: cuts on far sides of cavity. They are above wires but not the die | ||
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+ | {{: | ||
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+ | Above: tape placed to keep lid in place as its sheered off. Excessive movement may damage bond wires. Tape also helps retain large pieces if it fractures. | ||
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+ | {{: | ||
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+ | Above: lid peeled off after sheering | ||
DB-100 diamond bandsaw | DB-100 diamond bandsaw | ||
- | TLDR: | + | 2019-12-16 procedure for large ceramic packages: |
- | * Saw a small hole in one side of the cavity above bond wires | + | * Place chip in DIP-40 socket to help steady during cutting |
+ | * Saw a slit on both sides of the cavity | ||
+ | * As far as possible, usually about 0.1" after the quartz window | ||
+ | * Should be roughly | ||
+ | * Small debris in the cavity is normal and shouldn' | ||
+ | * Pins make good guides. I usually saw between two | ||
* Fill with nail polish to help protect the die against debris | * Fill with nail polish to help protect the die against debris | ||
+ | * Use a small pipette to pump it into the cavity from one side | ||
+ | * Should push out any water from sawing | ||
+ | * Alternatively, | ||
+ | * Place in vice with top cavity just above jaws | ||
+ | * Place tape over top of package | ||
+ | * Gently tap side of lid with chisel to sheer it | ||
+ | * Peel away tape and lid together | ||
+ | * Wash nail polish away with acetone | ||
+ | * See UV masking page for more info | ||
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+ | Grinding: | ||
+ | * Grinding was used more initially, but can be slower (especially for large packages) and may have increased change to damage die | ||
+ | * Alternate side of blade used to prolong blade life | ||
* Slowly side grind and/or cut across the whole cavity | * Slowly side grind and/or cut across the whole cavity | ||
- | | + | |
* You shouldn' | * You shouldn' | ||
+ | * Try to make one continuous cut | ||
+ | * Multiple cuts increase change to fragment and create larger debris | ||
* Wash nail polish away with acetone | * Wash nail polish away with acetone | ||
* See UV masking page for more info | * See UV masking page for more info | ||
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- | Need to make a jig or something instead of hand cutting swaths | ||
===== Thermal fracture (old) ===== | ===== Thermal fracture (old) ===== |