--- product_id: 328337851 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: "9226 Lei" currency: RON in_stock: true reviews_count: 5 url: https://www.desertcart.ro/products/328337851-cnctopbaos-rotational-4th-axis-a-axis-rotary-table-k11-100mm store_origin: RO region: Romania --- # 0.036° ultra-fine 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:** 9226 Lei **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?** 9226 Lei with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/328337851-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 - • **Built to Last:** Crafted from premium aluminum alloy with anti-rust coating for durability and a sleek, professional finish. - • **Backlash-Free Power:** Gapless harmonic gearbox delivers a rock-solid 50:1 reduction ratio ensuring zero backlash and maximum rigidity. - • **Precision Perfected:** Experience ultra-smooth rotation with a 0.036° step angle for flawless CNC engraving and milling. - • **Tailstock Stability:** 65mm center height tailstock with axial locking wrench offers enhanced support and precision during heavy-duty operations. - • **Robust Chuck Control:** K11 100mm 3-jaw self-centering chuck clamps your workpiece securely from 30-80mm externally for versatile machining. ## Overview The CNCTOPBAOS Rotational 4th Axis is a high-precision CNC rotary table featuring a gapless harmonic gearbox with a 50:1 reduction ratio, delivering backlash-free, ultra-smooth rotation at a fine 0.036° step angle. Equipped with a robust K11 100mm 3-jaw self-centering chuck and a 65mm center height tailstock, this aluminum alloy unit ensures durable, stable, and versatile performance for engraving, milling, and routing applications. ## Description Package include: 1Set 4th axis gapless harmonic K11-100mm Ratio 50:1 (with nema23 stepper motor and 3 jaw chuck) 1Pcs 65mm Tailstock 1Set of Anti-claw Descriptions: Engraving machine fourth axis (A axis, Rotational Axis, CNC dividing head) gapless harmonic reducer gearbox Chuck type: K11 100mm 3 jaw chuck Center height: 65mm Total height: 115mm Angle: 0.036°/ step Gear box output shaft diameter: 25mm Reducing ratio: 50:1 Stepper motor: Nema23 57mm 3A 2-phase 4 wire Weight: 6.5KG Parameter settings: The Mach3 system settings: the pulses for 1 required: ( the motor 1 Circle of pulse number × the drive of subdivision number × reduction ratio) ÷ 360 degrees For example, the two-phase nema23 motor, the ubdivision number 16, the reduction ratio 50:1 (200 × 16 × 50) ÷ 360 = 444.44444444) Ncstudio system settings: the angle of a pulse walking: 360 ÷ (the motor 1 Circle of pulse numberr × × the drive of subdivision number × reduction ratio) For example: the two-phase nema23 motor, the breakdown of the number 16, reduction ratio 50:1 360 ÷ (200 × 16 × 50) = 0.00225 Tailstock: Center Height: 65mm Stretch distance: 50mm Top tip: Activity type Axial locking wrench for tailstock ## 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 | |---------------|-------| | Asin | B07B2SL9SD | | Date First Available | 12 April 2018 | | Is Discontinued By Manufacturer | No | | Item Model Number | K11-100mm 50:1 | | Manufacturer | Changzhou Rattm Motor Co.,Ltd | | Package Dimensions | 50.8 x 28.45 x 20.32 cm; 2.42 kg | ## Product Details - **Brand:** CNCTOPBAOS - **Material:** Aluminum - **Item diameter:** 100 Millimeters - **Item weight:** 2.42 Kilograms - **Compatible devices:** Milling Machine ## 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/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 2](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 3](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 4](https://m.media-amazon.com/images/I/816THcGpMcL.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/71XS04ytKNL.jpg) ## Available Options This product comes in different **Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Accurate and repeatable after setup *by on Reviewed in the United States 16 April 2026* Set up on my Queen Ant CNC using Mach3. As it was my first I did have a learning curve setting up the driver. Not an issue with this product but learningthe setup. I have recut items using a reference mark and the cuts are right on. I do fine details cutting pens and with a bit of a learning curve using a 6.2° TBN. They come out great. Very satisfied. ### ⭐⭐⭐⭐ Pretty good little rotary. *by on Reviewed in the United States 13 November 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. ### ⭐⭐⭐⭐⭐ Good quality for the price, got it working on a Tormach/PassPilot *by on Reviewed in the United States 3 November 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. ## Frequently Bought Together - 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 - PGFUN DIY CNC Touch Probe XYZ Axis 3D Digitizing Edge Finder 3-Coordinate Measuring Sensor Kit with 6 mm Shank & 2.0 mm Tungsten Steel Ball Tip - FoxAlien Mini Low Profile Bench Vise Workholding Clamp Work Table for FoxAlien 3018, Masuter 3, Masuter Pro, 3S, XE-PRO, WM-3020 Vasto CNC Router Machine --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.ro/products/328337851-cnctopbaos-rotational-4th-axis-a-axis-rotary-table-k11-100mm](https://www.desertcart.ro/products/328337851-cnctopbaos-rotational-4th-axis-a-axis-rotary-table-k11-100mm) --- *Product available on Desertcart Romania* *Store origin: RO* *Last updated: 2026-08-21*