1 1/4 x 8 tpi Sanding Pad Adapter for Wood Lathe

Lathe Sanding Adapter - 1 1/4" x 8 TPI Version (Links to M33 & 1" in description)

This is a functional 3D-printable sanding pad adapter specifically designed for wood lathes with a 1 1/4" x 8 TPI spindle (common on many larger lathes, especially in North America). It allows you to mount standard 150mm (6") sanding discs directly onto your lathe for efficient power sanding of bowls, platters, and other turned projects.

The design includes a smooth internal register (unthreaded shoulder) before the threads begin. This ensures the adapter centers perfectly on the spindle and seats firmly against the headstock flange for maximum stability and reduced vibration.

The model features 9 integrated dust extraction holes, matching standard sanding disc patterns to keep your workspace cleaner and extend the life of your abrasives.

Technical Specifications

• Thread: 1 1/4" x 8 TPI (Imperial Standard Large Lathe Spindle)
• Disc Size: 150mm (6")
• Application: Disc sanding on a wood lathe
• Features: 9-hole dust extraction pattern and unthreaded alignment shoulder

Recommended Print Settings

To ensure the safety and durability of a rotating mechanical part, please follow these guidelines:

• Material: PETG or ASA is highly recommended. (Avoid standard PLA as the friction heat from sanding can cause it to soften and deform).
• Walls/Perimeters: Minimum 4-6 walls for a solid thread and structural integrity.
• Infill: 40-50% (Gyroid). For maximum strength, consider using a modifier in your slicer for 100% infill around the thread area.
• Layer Height: Use Variable Layer Height. Keep layers thin (0.12mm - 0.16mm) around the threads for a smooth, precise fit.

Safety Note

Always ensure the sanding pad is fully seated and tightened against the spindle shoulder before turning on the lathe. It is recommended to use this at lower speeds (e.g., up to 800-1000 RPM) to prevent excessive heat buildup. Always wear eye protection and a dust mask when sanding.

Link to other models:

M33: https://makerworld.com/en/models/2501883-m33-sanding-pad-adapter-for-wood-lathe#profileId-3009566

1" x 8TPI: https://makerworld.com/en/models/2723927-1-x-8-tpi-sanding-pad-adapter-for-wood-lathe#profileId-3017875