SprokCAD

SprokCAD is a practical tool for creating 2D chain drive drawings for hobbyists and small workshops. Enter the drive specifications, review the shape and dimensions, then save the project or export DXF and PDF files directly from your phone.

Key Features:

- Works offline and requires no account creation.

- Arabic and English interface with right-to-left direction support.

- Seven built-in chain sizes: #25, #35, #40, #41, #420, #428, and #520.

- Supports 10 to 300 teeth.

- Circular center hole and keyhole slot option.

- Automatically distributed screw hole pattern and relief hole options.

- Zoomable and pan vector preview.

- AutoCAD 2010-compatible DXF export with millimeter units and 1:1 scale model geometry.

- A3 drawing sheet included in the DXF file and an A4 bilingual PDF file for review. - Save, open, copy, search, and share projects locally.

The application relies on a built-in engineering library and a review of JIS S tooth configurations. The user must review project dimensions, material suitability, load, clearance, cutting compensation, and machine settings before manufacturing. The application does not provide resistance, load, or CAM run path calculations and is not a substitute for proper engineering review of the project.