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8700 CNC 4″ Rotary Table Indexer


CNC 4″ Rotary Table w/ Stepper Motor and Controller

SKU: 8700 Category:

Product Description

About the CNC 4″ Rotary Table Indexer

Sherline has taken their accurate and reliable 4″ rotary table into the 21st century with the addition of Computer Numeric Control. Clockmakers or anyone with a need to cut gears or other complicated radially symmetrical patterns will find this accessory takes all the headaches out of repetitive indexing operations.

Keypad3_colorAll entries are made from this simple keypad. No separate computer is needed. You get everything you need including the 4″ Sherline rotary table with installed stepper motor, microprocessor unit with numeric input keypad, 115 VAC power source, and all necessary connecting cables.

Vertical Mounting Options

The rotary table comes with clamps and T-nuts for attaching it to the T-slots of a Sherline mill table. In addition, there are two options available for mounting the table in the vertical position or at other angles:

3701 Right Angle Plate—This plate holds the table in the vertical position with a center height of 2.7″. A right angle tailstock P/N 3702 is also available to support long stock held on center in the rotary table.

3750 Tilting Angle Table—This table holds the rotary table and can be fixed at any angle from 0° to 90°. In the 90° position, the rotary table center is also at the 2.7″ height that allows the 3702 tailstock to be used with it.

Operation is very simple

After entering the number of steps per revolution (or the number of degrees per step) on a simple numeric keypad, the table advances quickly and precisely to the next position at the touch of a single advance key. If an error is made, previous positions can be accurately recalled by hitting another button. Basic resolution is 28,800 steps per revolution, ±0.006° per step. This allows the accurate machining of items like gears with odd numbers of teeth. Computations are made internally to a high degree of accuracy to avoid cumulative errors.

The CNC rotary indexer is a stand-alone unit. You get everything you need to make complex indexing jobs easy. In addition, the unit can be connected to an existing CNC control to act in conjunction with that system. An input signal triggers the programmed function. When it is complete, it signals back to continue the program. The unit can also be “daisy chained” with other units to trigger sequential actions. As with all Sherline accessories, complete instructions are included.

The rotary table can also be “daisy chained” with Sherline’s linear controller (P/N 8800) to achieve combinations of rotary and linear movement in sequence. This makes it easy to set up for relatively sophisticated operations like cutting gears without having to know anything about CNC programming beyond what is entered from these simple keypads.

NOTE: We are stating the following weight limits for our rotary tables for continual use.

  • Horizontal orientation—50 lbs.
  • Vertical orientation—30 lbs.
  • Vertical rotational torque—6 foot/lbs. (meaning it can lift a 6 lb. weight when suspended 12″ away from the center of the rotary table)

The rotary tables can hold more weight when they are not under a continual load. Click on the Video tab above to see examples of different weights and uses for our rotary tables.

Other Purchasing Options:

1140 3-Jaw Chuck “Pin Jaws”
3750-LAZ Laser Engraving Tilting Angle Table

The improper use of machine tools and their accessories can result in serious injury. Before using this tool, thoroughly read the instructions and make sure you understand its proper and safe use.


Always wear safety glasses when operating machine tools.

Download PDF 8700 Instructions

Instructions PDF Download

CNC Rotary Table in Action

Rotary Indexer Specifications
Table Size 4″ diameter by 2″ height
Part mounting Provisions Center thread including chuck adapter and 4 T-slots
Rotation Speed 1°/ sec to 50°/sec maximum (programmable)
Resolution 28,800 steps per revolution (±.006° per step)
Backlash Compensation Programmable
Stepper Motor 120 oz-in, 2 Amp, NEMA 23 Frame size, 400 steps per revolution
Power Supply Transformer Input: 120 VAC 60 Hz 38 W; Output: 24V, 1000 mA
10930 (2) 3/8” Bearing
30560 (4) 10-32 T-nut
35580 (2) Hold-down clamp
37090 Chuck adapter
37100 Rotary table base
37110 Rotary table top
37121 CNC rotary table worm housing (Not sold sep.)
37131 CNC rotary table worm shaft (Not sold sep.)
37122 CNC rotary table worm housing assembly
37123 CNC rotary table coupling
37124 CNC rotary table coupling adapter
37150 Oiler
37160 Preload nut
37170 Lock pin
37200 (2) 10-32 x 3/8” button head socket hd. screw
37210 Hold-down tab
37220 6-32 x 1/4” button head socket hd. Screw
40050 1-5/8” handwheel assembly
40330 (2) 10-32 x 5/8” SHCS
40420 Headstock bearing
40510 (4) 10-32 x 3/8” Socket head cap screw (SHCS)
40520 (7) 10-32 x 3/16” cup point set screw
40530 (4) 5-40 x 3/8” SHCS
40540 5/16-18 x 3/4” cone point set screw
40660 3/16” I.D. washer
40670 (2) 10-32 x 1/2” SHCS
50120 Pointer
67100 (4) 8-32 x 3/8” SHCS
67130 2 Amp, 100-oz., 23 frame size stepper motor
87041 120 VAC power supply (24 VDC, 1 amp output)
87100 Control unit with keypad/electronics
87250 Motor-to-keypad 6’ extension cable
87350 Remote (limit) switch/daisy-chain 1/2 cable
87510 CNC rotary table stepper motor mount