4″ HORIZONTAL/VERTICAL ROTARY TABLE (3900-2304)

4″ Horizontal/Vertical Rotary Table for Precision Machining

The 4-inch horizontal/vertical rotary table provides precise angular positioning in a compact format suitable for milling machines, benchtop equipment and space-conscious machining setups. Use it horizontally for circular machining or vertically for angular indexing, radial drilling and workpiece positioning.

With a 72:1 gear ratio, 10-second vernier reading, 2MT center hole and four T-slots, this rotary table gives machinists the control and workholding flexibility needed for small precision components, prototypes, repairs and maintenance work.

Compact Size Without Sacrificing Positioning Control

The 4-inch table is a practical choice when a larger rotary table would consume too much machine travel or reduce spindle clearance. Its 2.75-inch center height supports compact vertical setups while the 17 lb construction provides a stable platform that remains manageable during installation and repositioning.

• Horizontal and vertical mounting capability
• Compact 4″ table for smaller milling machines
• 72:1 worm-gear ratio for controlled positioning
• 10-second vernier reading for fine angular adjustment
• Four T-slots for flexible workpiece and fixture mounting
• 2MT center hole for compatible centers and setup tooling

Designed for Accurate Machining Setups

The table provides published accuracy specifications for squareness, parallelism, concentricity and clamping-surface flatness. These controlled geometric relationships help support repeatable workpiece alignment when the rotary table is correctly mounted, indicated and secured to the machine.

72:1 Gear Ratio and 10-Second Vernier

The 72:1 worm-gear mechanism provides controlled table rotation for angular positioning and indexing work. The integrated 10-second vernier scale supports fine adjustments beyond the main graduation markings.

For best accuracy, approach the final setting from the same direction whenever possible. This helps minimize the effect of mechanical backlash when positioning the table.

Horizontal and Vertical Operation

Mount the table horizontally for circular milling, arcs, hole patterns and operations performed around a vertical axis. Mount it vertically when the workpiece needs to rotate around a horizontal axis.

The 2.75-inch center height makes the vertical configuration suitable for compact components and compatible tailstock-supported setups. Any tailstock, chuck, adapter plate or dividing accessory should be checked separately for dimensional compatibility.

Four T-Slots for Flexible Workholding

Four table T-slots provide multiple mounting positions for compatible clamps, fixtures and workpieces. The symmetrical arrangement helps distribute clamping forces and makes it easier to create balanced setups.

The central 2MT tapered hole can accept compatible Morse taper centers and setup tooling. Always confirm the accessory dimensions, spindle clearance and required mounting hardware before ordering.

Technical Specifications

Recommended Applications

• Circular and arc milling
• Angular positioning and indexing
• Radial drilling patterns
• Machining equally spaced features
• Small flanges, collars and fixture components
• Prototype and repair work
• Maintenance-department machining
• Benchtop and compact milling-machine setups

Is This Rotary Table Compatible with Your Machine?

Before ordering, confirm that your machine provides enough table space, spindle clearance and load capacity for the rotary table, workpiece, clamps and any additional accessories. Also verify compatibility with the 2MT center hole and the machine table’s T-slot configuration.

For best results, clean the mating surfaces, secure the rotary table rigidly and indicate its axis relative to the machine spindle before machining.

Frequently Asked Questions

Can this rotary table be used horizontally and vertically?

Yes. It is designed for both horizontal and vertical mounting, allowing the rotation axis to be positioned vertically or horizontally according to the machining operation.

Does it include a chuck or dividing plates?

No chuck, mounting plate, tailstock or dividing-plate set is specified as included with this model. Any accessories shown separately should be confirmed before ordering.

What is the center-hole taper?

The center hole has a No. 2 Morse taper, commonly identified as 2MT or MT2.

Is it suitable for smaller milling machines?

Its 4-inch diameter, 2.75-inch center height and 17 lb weight make it a practical option for many compact and benchtop milling setups. Machine capacity and dimensional compatibility must still be verified before purchase.

Fast Fulfillment from Our USA Warehouse

USA warehouse stock allows faster domestic order processing and fulfillment. Contact SHOP TOOL USA if you need assistance confirming dimensions, accessory compatibility or the correct rotary-table size for your application.