Rotary Fixture

Optimized prints. Clean CAD. Complete drawings. Modular T-slot accessories for engineers who care about complete design packages.

This is a compact rotary fixture designed for precise, controlled manipulation of small parts during processing and assembly. The rack-and-pinion drive enables smooth, repeatable 360° rotation, while the modular T-slot base allows flexible positioning and quick adjustment. Ideal for applications requiring consistent access around cylindrical or irregular components. The design supports easy part fixturing and stable hands-free operation on a desktop setup.

Using thrust bearings & pullies are to give some preload to the fixture so it doesn't rattle. The setup can work perfectly well without either but the rotation will not be as smooth.

Recommended Print Settings

Material: PLA

Layer Height: 0.2 mm

Wall Loops: 2+

Infill: 15%

Supports: None needed

Build Instructions to Follow:

Hardware used:

2020 T-slot Aluminum Extrusion: T-Slotted Framing, Single Four Slot Rail, Silver, 20 mm Square, Solid | McMaster-Carr

3 x 6in. & 1 x 9in. extrusions

Clamp: OESS Lab Clamp 4 Prong Finger Style Cork-Coated Head and A Black Laboratory Stand Clip: Amazon.com: Industrial & Scientific

Brass Rod: Ultra-Formable 260 Brass, Rod, 300mm Long, 4mm Diameter | McMaster-Carr

This needs to be cut to 250mm

M5 Screw with 8mm length: T-Slotted Framing, End-Feed Nut and M5 Thread Button Head for 20 mm High Rail | McMaster-Carr

Gear/Pinion: 20 Degree Pressure Angle Plastic Gear, Round Bore, 0.8 Module, 60 Teeth | McMaster-Carr

Rack:20 Degree Pressure Angle Gear Rack, 0.8 Module | McMaster-Carr

Steel Rod: Hardened Undersized High-Speed M2 Tool Steel Rod, 8 mm Diameter, 4-1/2" Long | McMaster-Carr

Thrust Bearing x2: Thrust Ball Bearing, Steel, for 6 mm Shaft Diameter, 14 mm OD, 4.92 mm Thick | McMaster-Carr

M6 Nut x 4: Corrosion-Resistant 18-8 Stainless Steel Hex Nut, M6 x 1 mm Thread Size | McMaster-Carr

Coupling Nut: Low-Strength Steel Coupling Nut, Zinc-Plated, M6 x 1 mm Thread | McMaster-Carr

Threaded Rod: 18-8 Stainless Steel Threaded Rod, M6 x 1 mm Thread Size, 100 mm Long | McMaster-Carr

Socket Head Screw: Socket Head Captive Panel Screw, M5 x 0.8 mm Thread, 20 mm Long | McMaster-Carr

Included Models for Other Projects

Corner Bracket (2020): Gusset Bracket (2020) - Free 3D Print Model - MakerWorld

End Cap (2020): End Cap (2020) - Free 3D Print Model - MakerWorld