---
product_id: 255990065
title: "RATTMMOTOR Normally Open Mach3 CNC Automatic Tool Sensor Gauge Changer CNC Z Axis Probe Tool Touch Sensor Setter Setting 4 Wires for CNC Router Engraver Machine"
brand: "rattmmotor"
price: "NT$3903"
currency: TWD
in_stock: true
reviews_count: 8
category: "Rattmmotor"
url: https://www.desertcart.tw/products/255990065-rattmmotor-normally-open-mach3-cnc-automatic-tool-sensor-gauge-changer
store_origin: TW
region: Taiwan
---

# 0.001mm ultra-precise positioning DC24V 20mA low power rating dustproof & waterproof durability RATTMMOTOR Normally Open Mach3 CNC Automatic Tool Sensor Gauge Changer CNC Z Axis Probe Tool Touch Sensor Setter Setting 4 Wires for CNC Router Engraver Machine

**Brand:** rattmmotor
**Price:** NT$3903
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** RATTMMOTOR Normally Open Mach3 CNC Automatic Tool Sensor Gauge Changer CNC Z Axis Probe Tool Touch Sensor Setter Setting 4 Wires for CNC Router Engraver Machine by rattmmotor
- **How much does it cost?** NT$3903 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/255990065-rattmmotor-normally-open-mach3-cnc-automatic-tool-sensor-gauge-changer)

## Best For

- rattmmotor enthusiasts

## Why This Product

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

## Key Features

- • **Magnetic Mounting:** Strong bottom magnet ensures stable, easy installation directly on your CNC machine body.
- • **Robust Durability:** Engineered with dustproof, waterproof housing and super hard alloy contacts to withstand harsh CNC environments.
- • **Pinpoint Precision:** Achieve micron-level accuracy with 0.001mm positioning for flawless tool calibration.
- • **Smart Safety Alerts:** Built-in over-travel alarm protects your machine from costly errors and downtime.
- • **Seamless Integration:** 4-wire design outputs direct signals to your CNC system—no amplifier needed, reducing setup complexity.

## Overview

The RATTMMOTOR Mach3 CNC Tool Sensor is a high-precision, 4-wire Z-axis probe designed for CNC routers and engravers. It offers 0.001mm positioning accuracy, durable dustproof and waterproof construction, and a magnetic mount for easy installation. Compatible with Mach3 and UCCNC, it streamlines tool length setting, wear detection, and breakage alerts without requiring additional amplifiers, making it an essential upgrade for professional-grade CNC workflow efficiency.

## Description

Product description Mechanical Installation Try to install on the workbench where there is less iron filings and less splashing water. Must be installed vertically, to ensure that the bottom is flat to avoid causing large precision errors. Be sure to power off before installation. After the wiring is completed, place the tool setting tool in another place on the tool holder. After the tool signal is normal, fix the correct position. CNC Automatic Tool Sensor Gauge Changer Mach3 & Normally Open The tool setting instrument is suitable for the engraving machine machining center machine. The output signal of the tool setting instrument is received by the numerical control system and then the tool length setting, tool wear detection and tool breakage are detected by the program control. Note Please control the probe speed at 50-200mm/min. Use ambient temperature range 0 °C-80 °C. Please control the voltage at DC0-24V and the current below 20mA. Dustproof and Waterproof Dustproof and waterproof structure, it still has good durability under the condition of coolant and iron filings flying. No need a built-in amplifier Because the tool set does not need a built-in amplifie. Therefore There is no deviation caused by the temperature of the tool position and the fluctuation of the power supply voltage. It can be directly input to NO and program (PLC). Hard Alloy Materials The housing material of this tool setter is made of 4S grinding grade material. The bottom magnet design can be directly connected to the machine and firmly adsorbed to the body. The contactt material is made of super hard alloy, the design is exquisite and the installation is simple. Over-travel Alarm Signal The tool setter will send out an alarm signal in time when it is over-travel to avoid other troubles caused by equipment operation. The protruding sharp corner of the tool directly touches the tool tip related to the machining size, detects its value and size, and outputs the signal. It has higher accuracy than the average value obtained by converting the amount of light and electricity. Air intake Hose and How to Arrange It Blow off the required hose length and cut it in the direction of the axis lag. (There must be a margin for the length) Insert the cap nut into the hose. The hose should be worn at the end of the threaded pipe. (The hose must be inserted into the innermost part to avoid air leakage and pipe slippage) Tighten the cap nut by hand. Air Vent Hose Blow off the chips and coolant that are resurrected on the contactt surface and the tool. The grease and obligations that cannot be blown off and adhered to the contact parts should be cleaned frequently. The end of the tracheal screw joint will be damaged when the tool and cutting chips are strongly impacted. The radius of the air tube passage is 2 mm or more in diameter. B) The contactt method of the tool and the large contact surface On a large contactt head, there is a slight tilt when the tool touches the surrounding area. In order to compensate for this inclination, the original point is aligned on the radius of the corresponding outer diameter of the tool, and the inclination can be avoided. Note : After pressing the contactt down by hand, do not suddenly loosen it and let it recover instantly. Failure to do so may result in internal damage. Similarly, without using your fingers, use the tool to suddenly recover, or use the tool to touch and then drag horizontally to avoid. Tool Contactt Method When installing, use the tip of the tool to face the contactt and press down directly. The stroke of the tool holder must be taken into accountt. Do not press excessive force, which may cause damage to the knife and tool. The speed of aligning the sword is related to the response speed of the appliance on the mechanical side, so be careful not to exceed the specified speed when setting. In order to ensure the accuracy of the tool setting, the recommended speed is set by the following values. The repeatability of 50-200mm/min is 0.001mm (when the response speed of the mechanical control system is within 0.5msec), but when the drill diameter is within 0.5mm, use low-speed contact. (At the same time, you need to choose a low contactt force type). Alarm over travel Output Mode: NC (normally closed) Z Axis Probe Tool Touch Sensor Parameters Output Mode: NO (normally open) Stroke: 5mm Positioning accuracy: 0.001mm (speed: 20-200mm/min) Contact life: 3 million times Contact force: 1.5N The cutting head: D15mm, hard alloy Cable: 1.5M Protecting tube: 1.3M

Review: False advertising - This is not a Normally Open tool sensor. It is NC. I've ascertained that the only way it could be a normally open sensor is to have a built-in FET circuit. Aka would need to be a six-wire unit requiring voltage to invert the state. 6-wire versions provide both NC and NO states.
Review: Working well and seriously streamlines my workflow. - My initial order had some confusion with the item I received but the seller to care of the issue right away. I am very happy with the overall service. The Z-Axis gauge works well and the tests I have done so far show it has solid repeatability. I don't have an automatic tool changer. This allowed me to seriously streamline my tool changing process and got rid of a huge source of errors as I switched out tools. Overall it is well worth it. Note - I initially bought this for use on a 4x4 CNC Router running on Mach3. I have since shifted over to UCCNC and am very happy with the change. This Z-Axis probe worked fine on both. Actually even better on UCCNC since I have more probe inputs.

## Features

- 【Description】The tool setting instrument is a special tool setting instrument for the engraving machine machining center machine. The output signal of the tool setting instrument is received by the numerical control system and then the tool length setting, tool wear detection and tool breakage are detected by the program control. In the case of no vibration and malfunction, the thermal deformation of the machine can be corrected according to the rated voltage and current and the specified speed.
- 【Parameter】This is a normally open 4-wire high-precision tool setting instrument with a stroke of 5mm. The positioning accuracy is 0.001mm, the contact life is up to 3 million times, the contact force is 1.5N, and the contact rating: DC24V 20mA.
- 【Material】The housing material of this tool setter is made of 4S grinding grade material. The bottom magnet design can be directly connected to the machine and firmly adsorbed to the body. The contact material is made of super hard alloy, the design is exquisite and the installation is simple.
- 【Feature-1】This tool setting instrument is designed with dustproof and waterproof structure, which can still have strong durability under the condition of coolant and iron filings. It does not need a built-in amplifier and will not be caused deviations by the location temperature and power supply voltage fluctuations of the tool setting instrument, which can be directly input to the NC program.
- 【Feature-2】The tool setter will send out an alarm signal in time when it is over-travel to avoid other troubles caused by equipment operation. Moreover, the tool setter has strong anti-interference. The protruding sharp corner of the tool directly touches the tool tip related to the machining size, detects its value and size, and outputs the signal. It has higher accuracy than the average value obtained by converting the amount of light and electricity.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08LK93NTC |
| Brand | RATTMMOTOR |
| Brand Name | RATTMMOTOR |
| Current Rating | 20 Milliamps |
| Customer Reviews | 3.5 out of 5 stars 34 Reviews |
| Global Trade Identification Number | 00713721466467 |
| Item Dimensions | 5.91 x 2.76 x 4.33 inches |
| Item Weight | 0.45 Kilograms |
| Item dimensions L x W x H | 5.91 x 2.76 x 4.33 inches |
| Manufacturer | RTM |
| Material | Aluminum |
| Material Type | Aluminum |
| Maximum Supply Voltage | 24 Volts (DC) |
| Measurement Accuracy | 0.0001% |
| Model | H:65 |
| Mounting Type | Surface Mount |
| Output Type | Push-Pull |
| Part Number | H:65 |
| Sensing Distance | 5 Millimeters |
| Smart Home Compatibility | Not Smart Home Compatible |
| Style | Modern |
| Style Name | Modern |
| UPC | 713721466467 619191755172 769135849716 |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** RATTMMOTOR
- **Item Weight:** 0.45 Kilograms
- **Item dimensions L x W x H:** 5.91 x 2.76 x 4.33 inches
- **Material:** Aluminum
- **Style:** Modern

## Images

![RATTMMOTOR Normally Open Mach3 CNC Automatic Tool Sensor Gauge Changer CNC Z Axis Probe Tool Touch Sensor Setter Setting 4 Wires for CNC Router Engraver Machine - Image 1](https://m.media-amazon.com/images/I/71bLea7Wj9L.jpg)
![RATTMMOTOR Normally Open Mach3 CNC Automatic Tool Sensor Gauge Changer CNC Z Axis Probe Tool Touch Sensor Setter Setting 4 Wires for CNC Router Engraver Machine - Image 2](https://m.media-amazon.com/images/I/71MJjnioSoL.jpg)
![RATTMMOTOR Normally Open Mach3 CNC Automatic Tool Sensor Gauge Changer CNC Z Axis Probe Tool Touch Sensor Setter Setting 4 Wires for CNC Router Engraver Machine - Image 3](https://m.media-amazon.com/images/I/71OyWvPT7+L.jpg)
![RATTMMOTOR Normally Open Mach3 CNC Automatic Tool Sensor Gauge Changer CNC Z Axis Probe Tool Touch Sensor Setter Setting 4 Wires for CNC Router Engraver Machine - Image 4](https://m.media-amazon.com/images/I/71Vc0ZyjlWL.jpg)
![RATTMMOTOR Normally Open Mach3 CNC Automatic Tool Sensor Gauge Changer CNC Z Axis Probe Tool Touch Sensor Setter Setting 4 Wires for CNC Router Engraver Machine - Image 5](https://m.media-amazon.com/images/I/71yEzVYZB5L.jpg)

## Customer Reviews

### ⭐ False advertising
*by K***N on March 7, 2026*

This is not a Normally Open tool sensor. It is NC. I've ascertained that the only way it could be a normally open sensor is to have a built-in FET circuit. Aka would need to be a six-wire unit requiring voltage to invert the state. 6-wire versions provide both NC and NO states.

### ⭐⭐⭐⭐⭐ Working well and seriously streamlines my workflow.
*by D***N on July 17, 2019*

My initial order had some confusion with the item I received but the seller to care of the issue right away. I am very happy with the overall service. The Z-Axis gauge works well and the tests I have done so far show it has solid repeatability. I don't have an automatic tool changer. This allowed me to seriously streamline my tool changing process and got rid of a huge source of errors as I switched out tools. Overall it is well worth it. Note - I initially bought this for use on a 4x4 CNC Router running on Mach3. I have since shifted over to UCCNC and am very happy with the change. This Z-Axis probe worked fine on both. Actually even better on UCCNC since I have more probe inputs.

### ⭐⭐⭐⭐ Surprisingly repeatable. Some weirdness in the description and was I received
*by J***B on June 21, 2022*

What was shown seems to be the product I was shipped but the dimensions are way off. The two hold down screws are M4, not M5 (advertised as 5.3 mm when in fact what I was shipped is 4.05 mm). Not a good start to a precision instrument. I will update this as I get it installed. UPDATE: I am happy with the repeatability. The unit is worth the money. It looks crooked when sitting on a flat surface and it is. But it's been adjust to actually be flat for both top and bottom but the body and slide switch are slightly off center. I wouldn't be shocked to learn they are discarded from a manufacturer because they have visual defects but are still usable. Maybe when I have more money I will get a nicer unit but right now it's returning good consistent numbers. NOTE: the mounting screw holes are M4. The compressed air system is a M5 metric pneumatic connector. You can get them that will allow a 6mm the OD (4mm ID) tube and get a 1/8 NPT to 6mm OD fitting for your solenoid if you have a standard USA system like I do.

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*Product available on Desertcart Taiwan*
*Store origin: TW*
*Last updated: 2026-05-31*