Bolt Factory Addon: Incorrect countersink angle & head size in Create_CounterSink_Head() #105068

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sw-tya · 2023-12-15T21:50:26+01:00

sw-tya commented

2023-12-15 21:50:26 +01:00

System Information
Operating system: Linux-5.15.0-88-generic-x86_64-with-glibc2.35 64 Bits
Graphics card: Mesa Intel(R) HD Graphics 4000 (IVB GT2) Intel 4.2 (Core Profile) Mesa 23.2.1 - kisak-mesa PPA

Blender Version
Broken: version: 3.0.1, branch: Unknown, commit date: Unknown Unknown, hash: rBUnknown
Worked: If it did, not recently 6 years since the last edit in this function of, https://projects.blender.org/blender/blender-addons/src/branch/main/add_mesh_BoltFactory/createMesh.py

Addon Information
Name: BoltFactory (0, 4, 0)
Author: Aaron Keith

Short description of error

The countersink angle of the Head should be 90 degrees for smaller sizes then changing to 60 for bigger sizes >= M22.
Given the operator presets top out at M12, then 90 degrees is more appropriate.
More generally adding an adjustable parameter into the Countersink_Head would be the ideal solution.
I don't think my python skills are adequate to attempt that.
There is a small angle error introduced by the maths for the top radius.
RAD1 needs including in the line:
HEIGHT = tan(radians(60)) * (HEAD_RADIUS - SHANK_RADIUS)
Should be:
HEIGHT = tan(radians(45)) * (HEAD_RADIUS - SHANK_RADIUS) + RAD1
This will then preserve whatever angle is used to calculate the HEIGHT.
The default value in the M6 preset of bf_CounterSink_Head_Dia, in m6.py, causes an over-size output.
Should be 12.0 rather than 12.600000381469727
With 2. fixed this then causes the generated diameter to match the value entered.

Reference resources:
Example spec here with nice drawing: https://roymech.org/Useful_Tables/Screws/cap_screws.html notes the ISO specs as BS EN ISO 10642:1998. This supersedes BS 4168-8.
https://www.fasteners.eu/standards/ISO/10642/ has a table of the metric sizes which shows M22 and M24 being 60 degrees.

Exact steps for others to reproduce the error
In a new project, enable the Bolt Factory addon if not already setup.

Add -> Mesh -> BoltFactory
OperatorPresent -> m6
Model -> Nut
Type -> Hex
Change bf_CounterSink_Head_Dia from 12.6 to 12.0 to meet the spec.
Orientate to x view. Measure the Head angle.
Measured angle is 59 degrees with 12mm diameter.
Desired result would be 45 degrees and 12mm diameter.

**System Information** Operating system: Linux-5.15.0-88-generic-x86_64-with-glibc2.35 64 Bits Graphics card: Mesa Intel(R) HD Graphics 4000 (IVB GT2) Intel 4.2 (Core Profile) Mesa 23.2.1 - kisak-mesa PPA **Blender Version** Broken: version: 3.0.1, branch: Unknown, commit date: Unknown Unknown, hash: `rBUnknown` Worked: If it did, not recently 6 years since the last edit in this function of, https://projects.blender.org/blender/blender-addons/src/branch/main/add_mesh_BoltFactory/createMesh.py **Addon Information** Name: BoltFactory (0, 4, 0) Author: Aaron Keith **Short description of error** 1. The countersink angle of the Head should be 90 degrees for smaller sizes then changing to 60 for bigger sizes >= M22. Given the operator presets top out at M12, then 90 degrees is more appropriate. More generally adding an adjustable parameter into the Countersink_Head would be the ideal solution. I don't think my python skills are adequate to attempt that. 2. There is a small angle error introduced by the maths for the top radius. RAD1 needs including in the line: HEIGHT = tan(radians(60)) * (HEAD_RADIUS - SHANK_RADIUS) Should be: HEIGHT = tan(radians(45)) * (HEAD_RADIUS - SHANK_RADIUS) + RAD1 This will then preserve whatever angle is used to calculate the HEIGHT. 3. The default value in the M6 preset of bf_CounterSink_Head_Dia, in m6.py, causes an over-size output. Should be 12.0 rather than 12.600000381469727 With 2. fixed this then causes the generated diameter to match the value entered. Reference resources: Example spec here with nice drawing: https://roymech.org/Useful_Tables/Screws/cap_screws.html notes the ISO specs as BS EN ISO 10642:1998. This supersedes BS 4168-8. https://www.fasteners.eu/standards/ISO/10642/ has a table of the metric sizes which shows M22 and M24 being 60 degrees. **Exact steps for others to reproduce the error** In a new project, enable the Bolt Factory addon if not already setup. - Add -> Mesh -> BoltFactory - OperatorPresent -> m6 - Model -> Nut - Type -> Hex - Change bf_CounterSink_Head_Dia from 12.6 to 12.0 to meet the spec. - Orientate to x view. Measure the Head angle. Measured angle is 59 degrees with 12mm diameter. Desired result would be 45 degrees and 12mm diameter.

sw-tya added the

labels 2023-12-15 21:50:26 +01:00

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