---
product_id: 430293229
title: "CNCTOPBAOS K12-100mm CNC Router Milling Machine Rotational Axis 4th Axis A axis Rotary Table A axis 100mm 4 jaw chuck dividing head,MT2 65mm Tailstock Reducing ratio 6:1 for CNC Engraving Machine"
brand: "cnctopbaos"
price: "$219.63"
currency: USD
in_stock: false
reviews_count: 5
category: "Cnctopbaos"
url: https://www.desertcart.us/products/430293229-cnctopbaos-k12-100mm-cnc-router-milling-machine-rotational-axis-4th
store_origin: US
region: United States of America
---

# Waterproof Nema23 stepper motors Ultra-quiet vibration-reducing design 50:1 precision gear ratio CNCTOPBAOS K12-100mm CNC Router Milling Machine Rotational Axis 4th Axis A axis Rotary Table A axis 100mm 4 jaw chuck dividing head,MT2 65mm Tailstock Reducing ratio 6:1 for CNC Engraving Machine

**Brand:** cnctopbaos
**Price:** $219.63
**Availability:** ❌ Out of Stock

## Summary

> ⚙️ Elevate your CNC game with precision and power that never quits!

## Quick Answers

- **What is this?** CNCTOPBAOS K12-100mm CNC Router Milling Machine Rotational Axis 4th Axis A axis Rotary Table A axis 100mm 4 jaw chuck dividing head,MT2 65mm Tailstock Reducing ratio 6:1 for CNC Engraving Machine by cnctopbaos
- **How much does it cost?** $219.63 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/430293229-cnctopbaos-k12-100mm-cnc-router-milling-machine-rotational-axis-4th)

## 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

- • **Built to Endure:** Durable aluminum alloy body with anti-rust coating guarantees long-lasting performance in demanding industrial environments.
- • **Compact & Mighty:** Compact 170x90x115mm footprint with 2.6kg weight fits seamlessly into your CNC setup without compromise.
- • **Silent Powerhouse:** Waterproof hybrid stepper motors with vibration-dampening tech deliver whisper-quiet, stable operation.
- • **Precision Perfected:** 50:1 harmonic gearbox ensures zero backlash and ultra-smooth rotation for flawless multi-axis machining.
- • **Versatile CNC Essential:** Optimized for 5-axis CNC machining centers, routers, milling machines, and engraving tools—unlock complex designs effortlessly.

## Overview

The CNCTOPBAOS CNC 5th Axis Harmonic Rotary Table features a 50:1 speed reducing ratio on both A and C axes, powered by two waterproof Nema23 hybrid stepper motors. Its harmonic gapless gearbox ensures zero backlash and high rigidity, housed in a durable aluminum alloy frame with anti-rust coating. Compact and lightweight at 2.6kg, it’s engineered for precision multi-axis machining across CNC routers, milling machines, and engraving equipment.

## Description

Package include:1set 4th axis K12 100mm ( Includes stepper motor and 4 jaw chuck) Ratio 6:11 x 65mm MT2 Tailstock Descriptions:Chuck type: K12 100mm 4 jaw centering chuckCenter height: 65mmTotal height: 115mmAngle: 0.3°/ step Gear box output shaft diameter: 25mmReducing ratio: 6:1(belt deceleration mode)Stepper motor: Nema23 57mm 3A 2-phase 4 wireAccessories: Set of Anti-claw and wrenchesThe fourth axis parameter settings:Mach3 system settings: the pulses required for 1°(Motor 1 lap pulses x Driver fine fraction x Reduction ratio) ÷ 360°For example: 57mm 2- phase stepper motor, fine fraction of 16, reduction ratio 6:1(200 x 16 x 6 ) / 360=53.33333)Weihong system settings: 1 pulse along the angle 360°/(Motor 1 lap pulses x Driver fine fraction x Reduction ratio)For example: 57mm 2- phase stepper motor, fine fraction of 16, reduction ratio 6:1360 / (200 x 16 x 6) =0.001875Tailstock type MT2Center Height: 65mmStretch distance: 50mmTop tip: Activity typeAxial locking wrench for tailstockNema23 stepper motor 76mm Shaft Diameter: 8 mmStep Angle:1.8Current: 3ATemperature Rise: 80 c maxInsulation Resistance: 100MOhm(500V DC)Holding Torque: 18kg.cm

Review: Good and Solid 4 Jaw Chuck Construction...Works as Expected! (read comment) - I received a new 4th. Axis from the seller, and this one works fine!...Kudos to the seller for sending me a new one even when I was out of the desertcart’s return window. After I opened the box and manually tested it I realized that the new one was able to spin without much effort, opposite to the first one I got that it was hard to rotate, but since I didn’t know what to expect I thought it was fine and hard to rotate due to the stepper motor (I didn’t remove it). So here is my recommendation if you get one of these: Recommendation Once you receive your package, unscrew and remove the stepper motor (completely), as if you were trying to adjust the belt tension; this shouldn’t void your warranty as you should be able to adjust the belt any time and this is not opening the spindle. Now and without the stepper motor, manually rotate the spindle/chuck; the spindle/chuck should rotate freely, without much effort but not as a skateboard wheel; great if does. Even if you feel a small amount of friction it should be fine as it should be normal on these spindles/chucks. If you have a hard time rotating it (and hear something like a clicking sound) then you should be considering exchange it. Hope this helps. Note: I’m leaving my original comment below in case you were following… Original Comment: Disappointed!...The spindle it's barely turning and seemed to got stuck only after a few times using it. this happened right after my desertcart return window expired, so I contacted the seller for diagrams to see if I could open it and do some clean up or add grease, but they do not have any. The seller suggested to "hammer the inside four claws from the front to the back" but that seems radical and I'm not certain it will not damage completely the spindle. I have seen videos of other 4th axis that they have retainers/big nuts that you unscrew to open the interior, but this model has none; not in the back or in the front, and I have not found a site or video that shows how to open any of these models. Do not recommend. UPDATE 10/9/2019 The seller contacted me again and as there are no schematics available, then it's willing to help me solve the issue in a different way; by sending me a new product for testing and review, and have expedited the shipment. I'll provide new comments an possible update the overall rating once I have tested and reviewed the new product.
Review: Nice and solid construction. - Very solid motor gearbox. I am pleased with the craftsmanship of this robotic joint and look forward to activating it in a robot arm.

## Features

- Specifications of 4th Axis: Center height: 65 mm/2.56 inch; Total height:; 115 mm/4.5 inch; Angle: 0.3°/step ; Reduction ratio: 6:1; Base Material: Aluminum alloy; Size: 210x168x115 mm/8.3x6.6x4.5 inch; Weight: 7.9 KG/17.4 LB; Inner through hole diameter/shaft hollow diameter is 22 mm/0.86 inch; Output shaft diameter:30 mm/1.18 inch
- Nema23 Stepper Motor: Phase: 2 Phase; Type: Hybrid; Step Angle: 1.8°; Current: 3.0A; Holding torque: 270oz-in/1.8Nm; Shat diameter: 8mm; 4 Lead Wires: A+ to Red ; A- to Green ; B+ to Yellow ; B- to Blue; Motor Size: 57x57x76 mm
- Specifications of MT2 Tailstock: Morse Taper 2 Live Center Movable MT2 Tailstock; Center Height: 65 mm/2.56 inch; Expansion stroke: 45 mm1.77 inch; Stretch distance: 50 mm/1.97 inch; Top tip: Activity type; With Axial locking wrench for tailstock; Exquisite workmanship,Durable,Stable performance,Sturdy and Wear-resistant; Weight: 2.5 KG/5.5 LB
- Chuck Type: K12-100 4-Jaw self-centering chuck; Diameter:100mm; Max input torque: 60 N.m; Max Speed: 3500 R/min; External jaw clamping range: 30-80 mm/1.18-3.15 inches.; Internal jaw clamping range: 2-30 mm/0.08-1.18 inches; Internal jaw jamming range: 30-90 mm/1.18-3.54 inches; With four Anti-claw and Wrench
- Advantages: Rust proof coating process,stable 4 jaw chuck structure,fine workmanship,solid and practical jaw, excellent process to maximize service life;Application: The fourth axis can be used for three-dimensional processing of cylinders, bends and circles. The fourth axis engraving machine can be used for engraving spirals, scars etc

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07B2RX1BK |
| Brand | CNCTOPBAOS |
| Brand Name | CNCTOPBAOS |
| Capacity | 10 centimeters |
| Compatible Devices | Milling Machine |
| Compatible devices | Milling Machine |
| Customer Reviews | 4.2 out of 5 stars 44 Reviews |
| Handle Type | hand-tightened |
| Included Components | 4th axis K12 100mm, stepper motor, 4 jaw chuck, 65mm Tailstock |
| Item Diameter | 100 Millimeters |
| Item Weight | 10.23 Kilograms |
| Item diameter | 100 Millimeters |
| Item weight | 10.23 Kilograms |
| Lock Type | Self Centering |
| Manufacturer | CNCTOPBAOS |
| Manufacturer Part Number | S23 |
| Material | Aluminum |
| Material Type | Aluminum |
| Model Number | S23 |
| Number of Items | 1 |
| Number of Packs | 1 |
| UPC | 785004502711 |

## Product Details

- **Brand:** CNCTOPBAOS
- **Item weight:** 3.24 Kilograms
- **Manufacturer:** Changzhou Rattm Motor Co.,Ltd
- **Material:** Aluminum
- **Product dimensions:** 5.7W x 5.7H centimeters

## Images

![CNCTOPBAOS K12-100mm CNC Router Milling Machine Rotational Axis 4th Axis A axis Rotary Table A axis 100mm 4 jaw chuck dividing head,MT2 65mm Tailstock Reducing ratio 6:1 for CNC Engraving Machine - Image 1](https://m.media-amazon.com/images/I/61BG6gz7htL.jpg)
![CNCTOPBAOS K12-100mm CNC Router Milling Machine Rotational Axis 4th Axis A axis Rotary Table A axis 100mm 4 jaw chuck dividing head,MT2 65mm Tailstock Reducing ratio 6:1 for CNC Engraving Machine - Image 2](https://m.media-amazon.com/images/I/717T8f-Q3zL.jpg)
![CNCTOPBAOS K12-100mm CNC Router Milling Machine Rotational Axis 4th Axis A axis Rotary Table A axis 100mm 4 jaw chuck dividing head,MT2 65mm Tailstock Reducing ratio 6:1 for CNC Engraving Machine - Image 3](https://m.media-amazon.com/images/I/71N91XyKWeL.jpg)
![CNCTOPBAOS K12-100mm CNC Router Milling Machine Rotational Axis 4th Axis A axis Rotary Table A axis 100mm 4 jaw chuck dividing head,MT2 65mm Tailstock Reducing ratio 6:1 for CNC Engraving Machine - Image 4](https://m.media-amazon.com/images/I/61IWj4SluaL.jpg)
![CNCTOPBAOS K12-100mm CNC Router Milling Machine Rotational Axis 4th Axis A axis Rotary Table A axis 100mm 4 jaw chuck dividing head,MT2 65mm Tailstock Reducing ratio 6:1 for CNC Engraving Machine - Image 5](https://m.media-amazon.com/images/I/71x3NjwWfQL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good and Solid 4 Jaw Chuck Construction...Works as Expected! (read comment)
*by A***R on 7 October 2019*

I received a new 4th. Axis from the seller, and this one works fine!...Kudos to the seller for sending me a new one even when I was out of the Amazon’s return window. After I opened the box and manually tested it I realized that the new one was able to spin without much effort, opposite to the first one I got that it was hard to rotate, but since I didn’t know what to expect I thought it was fine and hard to rotate due to the stepper motor (I didn’t remove it). So here is my recommendation if you get one of these: Recommendation Once you receive your package, unscrew and remove the stepper motor (completely), as if you were trying to adjust the belt tension; this shouldn’t void your warranty as you should be able to adjust the belt any time and this is not opening the spindle. Now and without the stepper motor, manually rotate the spindle/chuck; the spindle/chuck should rotate freely, without much effort but not as a skateboard wheel; great if does. Even if you feel a small amount of friction it should be fine as it should be normal on these spindles/chucks. If you have a hard time rotating it (and hear something like a clicking sound) then you should be considering exchange it. Hope this helps. Note: I’m leaving my original comment below in case you were following… Original Comment: Disappointed!...The spindle it's barely turning and seemed to got stuck only after a few times using it. this happened right after my Amazon return window expired, so I contacted the seller for diagrams to see if I could open it and do some clean up or add grease, but they do not have any. The seller suggested to "hammer the inside four claws from the front to the back" but that seems radical and I'm not certain it will not damage completely the spindle. I have seen videos of other 4th axis that they have retainers/big nuts that you unscrew to open the interior, but this model has none; not in the back or in the front, and I have not found a site or video that shows how to open any of these models. Do not recommend. UPDATE 10/9/2019 The seller contacted me again and as there are no schematics available, then it's willing to help me solve the issue in a different way; by sending me a new product for testing and review, and have expedited the shipment. I'll provide new comments an possible update the overall rating once I have tested and reviewed the new product.

### ⭐⭐⭐⭐⭐ Nice and solid construction.
*by A***R on 27 October 2025*

Very solid motor gearbox. I am pleased with the craftsmanship of this robotic joint and look forward to activating it in a robot arm.

### ⭐⭐⭐⭐⭐ It works!!
*by J***G on 4 July 2026*

I had this for a few weeks now, and based on the price i was cautiously optimistic as to what it can do :-) Turns out it actually works real well! I have been using it for 3+2 axis machining so far and the precision is geed enough to make real usable parts :-) Been machining brass and aluminum, no problem. I had to make a fixture plate to hold the 5th axis vise on it since none were available anywhere. I think the value for money is great, would buy again!

## Frequently Bought Together

- CNCTOPBAOS Rotation 5th Axis Rotary Table,CNC 4th Axis A Axis B C Axis Dividing Head,Waterproof Nema23 Stepper Motor,No Backlash Harmonic Reducer Gearbox 50:1 for CNC Router Engraving Milling Machine
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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-10-22*