---
product_id: 245713305
title: "CNCTOPBAOS Rotational 4th Axis A axis Rotary Table,K11-100mm 3 Jaw Chuck Dividing Head,Gapless Harmonic Gearbox Reducer Ratio 50:1 w/ 65mm Tailstock for CNC Router Engraving Milling Machine"
brand: "cnctopbaos"
price: "C$49879"
currency: NIO
in_stock: true
reviews_count: 6
category: "Cnctopbaos"
url: https://www.desertcart.ni/products/245713305-cnctopbaos-rotational-4th-axis-a-axis-rotary-table-k11-100mm
store_origin: NI
region: Nicaragua
---

# 0.036° step angle precision 100mm K11-3 jaw self-centering chuck 50:1 gapless harmonic gearbox ratio CNCTOPBAOS Rotational 4th Axis A axis Rotary Table,K11-100mm 3 Jaw Chuck Dividing Head,Gapless Harmonic Gearbox Reducer Ratio 50:1 w/ 65mm Tailstock for CNC Router Engraving Milling Machine

**Brand:** cnctopbaos
**Price:** C$49879
**Availability:** ✅ In Stock

## Summary

> ⚙️ Elevate your CNC game with precision that commands attention!

## Quick Answers

- **What is this?** CNCTOPBAOS Rotational 4th Axis A axis Rotary Table,K11-100mm 3 Jaw Chuck Dividing Head,Gapless Harmonic Gearbox Reducer Ratio 50:1 w/ 65mm Tailstock for CNC Router Engraving Milling Machine by cnctopbaos
- **How much does it cost?** C$49879 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ni](https://www.desertcart.ni/products/245713305-cnctopbaos-rotational-4th-axis-a-axis-rotary-table-k11-100mm)

## Best For

- cnctopbaos enthusiasts

## Why This Product

- Trusted cnctopbaos brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Precision Perfected:** Experience ultra-smooth rotation with a gapless harmonic gearbox delivering zero backlash and a 50:1 reduction ratio for pinpoint accuracy.
- • **Stepper Motor Power:** Hybrid NEMA23 stepper motor with 12kg.cm holding torque ensures reliable indexing and light milling tasks with smooth, controlled motion.
- • **Tailstock Stability:** Enhance machining stability with a 65mm center height MT2 live center tailstock featuring a 45mm expansion stroke for versatile support.
- • **Robust Chuck Control:** Secure your workpiece effortlessly with the 100mm K11 self-centering 3-jaw chuck, engineered for stable clamping from 2mm to 80mm.
- • **Durable & Lightweight:** Crafted from premium aluminum alloy with anti-rust coating, combining rugged durability with a manageable 6.8kg weight for easy integration.

## Overview

The CNCTOPBAOS 4th Axis Rotary Table is a high-precision CNC accessory featuring a gapless harmonic gearbox with a 50:1 reduction ratio, a 100mm K11 self-centering 3-jaw chuck, and a 65mm tailstock for enhanced stability. Made from durable aluminum alloy, it offers smooth, backlash-free rotation with a 0.036° step angle, powered by a reliable NEMA23 stepper motor. Ideal for professional-grade engraving, milling, and light machining, this unit integrates seamlessly with CNC routers and milling machines, delivering consistent accuracy and robust performance.

## Description

CNCTOPBAOS Rotational 4th Axis A axis Rotary Table,K11-100mm 3 Jaw Chuck Dividing Head,Gapless Harmonic Gearbox Reducer Ratio 50:1 w/ 65mm Tailstock for CNC Router Engraving Milling Machine - desertcart.com

Review: Good quality for the price, got it working on a Tormach/PassPilot - Excellent packaging and nice workmanship. The NEMA23 stepper at the end is open to the elements (coolant), and the flimsy cables are unprotected, both of which can either be accepted or fixed by adding a small enclosure that hides the stepper and cable nuts, plus an armored cable. Anyone with a use of a 4th axis can probably devise such an enclosure in an afternoon. the chuck is a standard low-cost CN-made 4" chuck. The electro-mechanical specs (stepper, gear ratio, and such) seemed to be the substantially the same as the 4" from TM, so I was hoping that, after configuring the DIP switches on TM's 4th axis integration kit appropriately for the TM 4" but lower current, and in PathPilot's UI selecting the 4" 4th axis option, it would work out of the box. It stepped just fine, but the angles were off by a bit. I had to adjust the SCALE value in the PathPilot 4th axis config file from 141.666666 (which, according to my math, would be appropriate for a 51:1 gear ratio) to 138.888888 (which is correct for a 1:50 gear ratio). If you don't know how to do that, google it in the LinuxCNC forums. If that's too much wizardy, then this product is probably not for you. The stepper is considerably less powerful than TM's NEMA34 stepper, but for my purpose--which can be best described as indexing rather than 4th axis continuous machining--it works just fine. I'm pretty sure there would be enough torque for light machining (maybe a 1/4" endmill and light cuts in AL). I haven't used the tailstock yet. For my first experiments, I put the whole thing into my 5" vise, which has just enough travel and was already properly aligned.
Review: Unlucky with product, great desertcart support - Pro . The second unit I received worked very well. The machine has much more torque than I expected with zero detectable back-lash although this is based on fairly crude measurements.. I purchased the unit to work on 3/8 inch aluminum rod on a proper industrial milling machine and I feel that it would handle larger diameter steel rod if required. The chuck and steady seem quite good quality. The unit is easily controlled from a simple Arduino micro-processor using one of several freely available libraries and examples, I think I used a library called SpeedyStepper which allows quite elaborate movements. It will conveniently mount in a standard milling machine vise so there is no need to align it on the mill table if you have a good quality vise and you prefer to keep it in place. . Cons . If the first unit had operated properly I would have given 4 stars. Unfortunately it sounded during rotation as though a gear or bearing was grinding badly.. desertcart's return process worked beautifully and I had a replacement unit in a couple of days with plenty of time to return the original unit at no cost through a Kohl's store. The unit is not finish machined so its inherent precision is suspect but this will not matter for most applications. The supplied instructions are not great. In the end I discovered that putting the machine into operation was not very difficult but better instructions would have saved a lot of time. Do not forget that you will need a fairly capable driver to operate the unit.. This unit does not have a hole all the way through the body so you cannot work on long stock. About 5 inches would be maximum length. You cannot control this unit directly from a 4th axis output on an industrial grade milling machine. It is more correctly descried as an indexer rather than a 4th axis although some simple CNCs that use stepper motors rather than servos may be able to drive it directly. I am working on this with a CNC technician..

## Features

- Specifications of 4th Axis: Center height: 65 mm 2.56"; Total height:; 105 mm 4.13"; Angle: 0.036°/step ; Gearbox model: 17-50; Reduction ratio: 50:1; Base Material: Aluminum alloy; Size: 260x110x105 mm 10.2x4.34x4.13"; Weight: 6.8 KG / 14.98 LB
- Specifications of Chuck: K11-100 3 Jaw self-centering chuck; Diameter:100 mm 3.93 inch; With 3 Anti-claw and Wrench; Max input torque: 60N.m; Max Speed: 3500 R/min; External jaw clamping range: 30-80mm 1.18-3.15 inch.; Internal jaw clamping range: 2-30mm 0.08-1.18 inch; Internal jaw jamming range: 30-90mm 1.18-3.54 inch
- Specifications of Tailstock: Morse Taper 2 Live Center Movable MT2 Tailstock; Center Height: 65mm 2.56 inch; Expansion stroke: 45mm 1.77 inch; Stretch distance: 50mm 1.97 inch; Top tip: Activity type; With Axial locking wrench for tailstock; Weight: 2.5 KG 5.5 LB
- Specifications of Stepper Motor: Hybrid Nema23 Stepper Motor; Phase: 2-phase; Size: 57x57x56mm; Step Angle: 1.8°; Holding Torque: 12kg.cm/178oz-in/120N.cm; Rated Current:3A; Shaft dia:8mm; 4 Lead Wires: A+ to Red ; A- to Green ; B+ to Yellow ; B- to Blue
- Features: Adopting gapless harmonic gearbox,with higher precision, no backlash, high rigidity, high efficiency, stable structure, smooth operation; Made of high quality aluminum alloy, anti rust coating process, fine workmanship, excellent forging process, and long service life

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | CNCTOPBAOS |
| Capacity | 63 Millimeters |
| Compatible Devices | Milling Machine |
| Item Diameter | 1E+2 Millimeters |
| Item Weight | 2.42 Kilograms |
| Material | Aluminum |

## Product Details

- **Brand:** CNCTOPBAOS
- **Material:** Aluminum
- **Power Source:** Corded Electric
- **Item Weight:** 9.16 Kilograms
- **Maximum Rotational Speed:** 3.5E+3 RPM

## Images

![CNCTOPBAOS Rotational 4th Axis A axis Rotary Table,K11-100mm 3 Jaw Chuck Dividing Head,Gapless Harmonic Gearbox Reducer Ratio 50:1 w/ 65mm Tailstock for CNC Router Engraving Milling Machine - Image 1](https://m.media-amazon.com/images/I/715B2aKkPdL.jpg)
![CNCTOPBAOS Rotational 4th Axis A axis Rotary Table,K11-100mm 3 Jaw Chuck Dividing Head,Gapless Harmonic Gearbox Reducer Ratio 50:1 w/ 65mm Tailstock for CNC Router Engraving Milling Machine - Image 2](https://m.media-amazon.com/images/I/716xEpdlInL.jpg)
![CNCTOPBAOS Rotational 4th Axis A axis Rotary Table,K11-100mm 3 Jaw Chuck Dividing Head,Gapless Harmonic Gearbox Reducer Ratio 50:1 w/ 65mm Tailstock for CNC Router Engraving Milling Machine - Image 3](https://m.media-amazon.com/images/I/71XS04ytKNL.jpg)
![CNCTOPBAOS Rotational 4th Axis A axis Rotary Table,K11-100mm 3 Jaw Chuck Dividing Head,Gapless Harmonic Gearbox Reducer Ratio 50:1 w/ 65mm Tailstock for CNC Router Engraving Milling Machine - Image 4](https://m.media-amazon.com/images/I/71xYAtG0OaL.jpg)
![CNCTOPBAOS Rotational 4th Axis A axis Rotary Table,K11-100mm 3 Jaw Chuck Dividing Head,Gapless Harmonic Gearbox Reducer Ratio 50:1 w/ 65mm Tailstock for CNC Router Engraving Milling Machine - Image 5](https://m.media-amazon.com/images/I/816THcGpMcL.jpg)

## Available Options

This product comes in different **Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good quality for the price, got it working on a Tormach/PassPilot
*by S***N on November 3, 2021*

Excellent packaging and nice workmanship. The NEMA23 stepper at the end is open to the elements (coolant), and the flimsy cables are unprotected, both of which can either be accepted or fixed by adding a small enclosure that hides the stepper and cable nuts, plus an armored cable. Anyone with a use of a 4th axis can probably devise such an enclosure in an afternoon. the chuck is a standard low-cost CN-made 4" chuck. The electro-mechanical specs (stepper, gear ratio, and such) seemed to be the substantially the same as the 4" from TM, so I was hoping that, after configuring the DIP switches on TM's 4th axis integration kit appropriately for the TM 4" but lower current, and in PathPilot's UI selecting the 4" 4th axis option, it would work out of the box. It stepped just fine, but the angles were off by a bit. I had to adjust the SCALE value in the PathPilot 4th axis config file from 141.666666 (which, according to my math, would be appropriate for a 51:1 gear ratio) to 138.888888 (which is correct for a 1:50 gear ratio). If you don't know how to do that, google it in the LinuxCNC forums. If that's too much wizardy, then this product is probably not for you. The stepper is considerably less powerful than TM's NEMA34 stepper, but for my purpose--which can be best described as indexing rather than 4th axis continuous machining--it works just fine. I'm pretty sure there would be enough torque for light machining (maybe a 1/4" endmill and light cuts in AL). I haven't used the tailstock yet. For my first experiments, I put the whole thing into my 5" vise, which has just enough travel and was already properly aligned.

### ⭐⭐⭐ Unlucky with product, great Amazon support
*by B***. on August 27, 2019*

Pro . The second unit I received worked very well. The machine has much more torque than I expected with zero detectable back-lash although this is based on fairly crude measurements.. I purchased the unit to work on 3/8 inch aluminum rod on a proper industrial milling machine and I feel that it would handle larger diameter steel rod if required. The chuck and steady seem quite good quality. The unit is easily controlled from a simple Arduino micro-processor using one of several freely available libraries and examples, I think I used a library called SpeedyStepper which allows quite elaborate movements. It will conveniently mount in a standard milling machine vise so there is no need to align it on the mill table if you have a good quality vise and you prefer to keep it in place. . Cons . If the first unit had operated properly I would have given 4 stars. Unfortunately it sounded during rotation as though a gear or bearing was grinding badly.. Amazon's return process worked beautifully and I had a replacement unit in a couple of days with plenty of time to return the original unit at no cost through a Kohl's store. The unit is not finish machined so its inherent precision is suspect but this will not matter for most applications. The supplied instructions are not great. In the end I discovered that putting the machine into operation was not very difficult but better instructions would have saved a lot of time. Do not forget that you will need a fairly capable driver to operate the unit.. This unit does not have a hole all the way through the body so you cannot work on long stock. About 5 inches would be maximum length. You cannot control this unit directly from a 4th axis output on an industrial grade milling machine. It is more correctly descried as an indexer rather than a 4th axis although some simple CNCs that use stepper motors rather than servos may be able to drive it directly. I am working on this with a CNC technician..

### ⭐⭐⭐⭐ Pretty good little rotary.
*by J***N on November 13, 2019*

The first one I received had a ton of backlash and was really disappointing after reading the other reviews. While I was waiting for the replacement to arrive I decided to look inside and see what was wrong. When I removed the motor I found the two set screws on the motor shaft were loose so I tightened them, put it back together and measured this to only have 3 arc minutes of backlash. Happy with that I kept the original and sent the second one back unused. This didn't come with any directions so I had to go the internet for wiring the motor: A+ red, A- green, B+ yellow, B- blue. I have this running at 27500 degrees/minute which I think is pretty impressive considering the 50:1 reduction. To achieve that its running on 50 volts, at 2.84 peak amps. I really don't know if 50v is ok for this motor since there is no documentation with it, but that's what my system runs at so that's what its getting. My only other gripe is that this should really come with a 4 jaw chuck in stead of 3 since it will predominantly be used on routers.

## Frequently Bought Together

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*Product available on Desertcart Nicaragua*
*Store origin: NI*
*Last updated: 2026-01-29*