For woodworkers and metalworkers who crave perfect spheres or rounded radii on small lathes, specialized attachments make the difference between good results and project perfection. This guide highlights five top ball turning and sphere-related tools designed for woodturners and mini lathes, including direct-fitting ball turners and radius tools. Read on to compare features, compatibility, and practical application tips to help you choose the right jig or attachment for your lathe setup.
Summary of selected products:
- Assorts Ball Turning Attachment for 7×14 & 7×16 Mini Lathes — direct-fit for small lathes with TCMT insert tips.
- Ball Turning Attachment For Lathe — Turns round convex/concave spheres; fits Myford and similar lathes; with indexable insert.
- Assorts Radius Ball Turning Tool for Lathe — 3/8″ shank HSS tool bit; suitable for 7×14 & 7×16 mini lathes.
- Radius Ball Turning Tool Attachment for Lathe Machine II — 3/8″ shank; sturdy design for better finish and cut.
- TANOMATE Negative Rake Cutter — carbide replacement inserts for woodturning ball and radius shaping.
Ball Turning Attachment for Small Lathes
Brand: ASSORTS
Key features:
- World’s first direct-fitting ball turning attachment for 7 x 14 / 7×16 mini lathes
- Easy installation: mounts directly onto the cross slide for immediate use
- Dual TCMT110204 inserts with 3 cutting edges each for versatile ball turning
Ball Turning Attachment For Lathe — Radius Sphere Tool
Brand: ASSORTS
Key features:
- Designed for turning spherical, convex, and concave shapes on metal lathes
- Mounts to cross slide of Myford and similar small lathes for quick setup
- Indexable TNMG16 insert included with six usable cutting edges
Assorts Radius Ball Turning Tool for Lathe
Brand: ASSORTS
Key features:
- Precise radius ball turning for concave and convex metal spheres
- 3/8″ shank HSS tool bit suited for light to medium-duty sphere turning
- Multiple sizes available, supporting radii up to 65 mm
Radius Ball Turning Tool Attachment for Lathe Machine II
Brand: AD INTERNATIONAL
Key features:
- Precision ball and radius turning tool for small lathes
- Versatile: suitable for brass, aluminum, steel, or plastic
- Capable of cutting convex curves up to 3/4″ diameter; durable solid metal construction
TANOMATE Negative Rake Carbide Cutter For Lathe Tools
Brand: Tanomate
Key features:
- Negative rake carbide inserts reduce chipping and catches when turning resins and acrylics
- Made of tungsten carbide with submicron grain for wear resistance
- Radius cutters enable shaping with sweeping arcs
Buying Guide: What To Consider When Choosing A Sphere Jig Or Ball Turning Attachment
- Lathe compatibility: Confirm the attachment is designed for your lathe model or size class (7×14, 7×16, Myford, etc.). Some devices mount directly to the cross slide, while others require adapters.
- Insertion and cutting edges: Look for inserts with multiple usable edges to maximize tool life. Carbide options offer wear resistance, while HSS bits provide different cutting characteristics for metals and plastics.
- Turnable shapes and radii: Decide whether you need true spheres, convex, or concave spheres. Some tools excel at precise radii, while others are better for general ball turning and knobs.
- Material support: Tools are offered for brass, aluminum, steel, and plastics. Match the tool to your workpiece material to achieve clean finishes and avoid chatter.
- Setup ease: Direct-fitting designs save time and reduce alignment errors. Check if installation requires clamps, screws, or cross-slide adjustments and if the tool is compatible with existing tool rests or stands.
- Durability and build quality: Prefer tools machined from solid stock or high-quality carbide inserts. Durable designs reduce maintenance and improve longevity on hobby and light-industrial projects.
- Price vs. value: While premium carbide tools are costlier, they offer longer wear life and better surface finishes on consistent projects. For occasional use, more economical options can be adequate.
- Safety and compliance: Follow lathe safety protocols, including proper workholding, speed settings, and PPE when turning spheres or radii. Ensure guards and force-liling considerations are addressed in your shop.
These tools collectively support a range of sphere and radius turning tasks on compact lathes. When selecting, prioritize compatibility with your lathe, the desired sphere geometry, and the balance between tool life and upfront cost. For best results, combine a robust ball turning attachment with a precise tool rest or support system and maintain sharp inserts to minimize vibration and maximize finish quality.