Fine pitch and challenging BGA designs lead to tolerance problems with pin to pin pitch and track to via clearance. Some fabricators are unable to provide the needed level of service.
Steps to reproduce
Inspect design rules in the layout
Generate and upload gerber files
Seek dialog and assurance from more than one fabricator
Expected result
Compare answers and consider guidance from the fabricators.
Actual result
Neither answers nor guidance has been obtained.
Workaround
Seek advice from online sources like KiCAD and Eevblog forums.
Severity level
This is medium priority because project deliverables could eventually fail due to advanced tolerance levels..
# Discuss tolerances with fabricators
## Problem environment
Fine pitch and challenging BGA designs lead to tolerance problems with pin to pin pitch and track to via clearance. Some fabricators are unable to provide the needed level of service.
## Steps to reproduce
1. Inspect design rules in the layout
2. Generate and upload gerber files
3. Seek dialog and assurance from more than one fabricator
## Expected result
Compare answers and consider guidance from the fabricators.
## Actual result
Neither answers nor guidance has been obtained.
## Workaround
Seek advice from online sources like KiCAD and Eevblog forums.
## Severity level
This is **medium priority** because project deliverables could eventually fail due to advanced tolerance levels..
…which roughly correspond with HDI fabrication technology standards, and is accordingly expensive.
Tolerances are documented in [dscomm.pro](/NLNetfound/dsendcomm/src/hardware/dscomm.pro):
```
MinTrackWidth=0.09
MinViaDiameter=0.356
MinViaDrill=0.2
<and-so-on>
```
…which roughly correspond with HDI fabrication technology standards, and is accordingly expensive.
Discuss tolerances with fabricators
Problem environment
Fine pitch and challenging BGA designs lead to tolerance problems with pin to pin pitch and track to via clearance. Some fabricators are unable to provide the needed level of service.
Steps to reproduce
Expected result
Compare answers and consider guidance from the fabricators.
Actual result
Neither answers nor guidance has been obtained.
Workaround
Seek advice from online sources like KiCAD and Eevblog forums.
Severity level
This is medium priority because project deliverables could eventually fail due to advanced tolerance levels..
Tolerances are documented in dscomm.pro:
…which roughly correspond with HDI fabrication technology standards, and is accordingly expensive.