Ø76 mm Disc Drawing Generator

A Windows-only Python script that drives AutoCAD® invisibly and produces a fully-annotated drawing:

• Ø 76 mm circle with dashed centre-lines
• 3 mm-tall rectangular bar (labeled 0.15 ± 0.05 mm)
• Stacked limits +0.0 / –0.2 above the diameter value
• Closed-filled magenta arrows, white text
• Note block ("VISUAL CRITERIA …") at lower left

Outputs are written to outputs/:

• outputs/disc_76.dwg – drawing
• outputs/disc_76.log – run-time log

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Prerequisites

Requirement	Notes
AutoCAD desktop ≥ 2016	Any full edition (LT/OEM may lack COM automation)
Python 3.8 – 3.12 (Windows)	Bitness must match AutoCAD (32/64-bit)
pywin32	Install with pip install -r requirements.txt

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Installation

git clone https://github.com/your-org/disc-76-dwg.git
cd disc-76-dwg

python -m venv venv
venv\Scripts\activate

pip install -r requirements.txt

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Usage

python generate_disc_drawing.py

The script will:

1. Launch AutoCAD in the background
2. Build the drawing
3. Save files in outputs/
4. Log progress to outputs/disc_76.log
5. Close AutoCAD cleanly

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Configuration

Edit the constants near the top of generate_disc_drawing.py to fine-tune the output.

Variable	Description	Default
CIRCLE_DIA	Disc diameter (mm)	76.0
BAR_HEIGHT	Visible bar height (mm)	3.0
LABEL_THK	Thickness shown in the dim text (mm)	0.15
TXT_H	Dimension text height (mm)	2.5
TOL_SCALE	Tolerance text height factor	0.9
DX_DIA	Horizontal nudge for diameter tolerance (× TXT_H)	-4
DX_THK	Horizontal nudge for thickness tolerance (× TXT_H)	-7.5

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License

MIT — see LICENSE.