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| MODEL: | |
|---|---|
BT30 BT40 BT50
ZH
84661000
Alloy Steel
CNC Machine Tools Spindle Pull Back Force Gauge BT30 BT40 BT50 Spindle Tension Meter
ZH
CNC Machine Tools Spindle Pull Back Force Gauge BT30 BT40 BT50 Spindle Tension Meter
Features:
1. High stability, hydraulic mechanical structure
3. models: BT30, BT40, BT50
4. In order to ensure the correctness of the measured data, the tension meter must be used in the case of pre-tensioning.
| Model | Measurement Range | Reference tension Range | Weight/kgs |
| BT30 | 0-150kg/cm2 | 200-500 | 4.2 |
| BT40 | 0-150kg/cm2 | 500-1100 | 4.3 |
| BT50 | 0-650kg/cm2 | 1500-2200 | 6.7 |
The unseen heart of your CNC milling machine's rigidity is the drawbar mechanism. It uses a stack of Belleville washers (disc springs) to pull the tool holder up into the spindle taper with thousands of pounds of force. Millions of tool changes eventually cause these springs to crack or lose tension. When pull force drops, the tool holder micro-vibrates inside the spindle during heavy cuts, leading to chatter, broken tools, and irreversible damage to the spindle taper itself. The Spindle Pull Force Gauge is a plug-and-play diagnostic tool. By simply inserting it into the spindle like a standard tool holder and activating the tool clamp, the built-in hydraulic gauge instantly displays the exact pulling force, allowing you to verify if your machine meets the manufacturer's specifications.
Accurate Hydraulic Measurement: Utilizes a highly sensitive, sealed hydraulic oil system connected to a precision analog pressure gauge, delivering accurate and repeatable force readings in Kilonewtons (kN) or Kilograms-force (kgf).
Prevents Costly Spindle Damage: Regular testing allows maintenance teams to identify fatigued drawbar springs early, preventing the catastrophic spindle taper fretting (bell-mouthing) caused by loose tool holders.
Premium Hardened Taper: The body of the gauge is forged from high-grade alloy steel and precision-ground to AT3 taper specifications, ensuring perfect contact with the spindle without causing any damage during testing.
Shock-Resistant Gauge: The dial is liquid-filled (typically glycerin or silicone oil) to dampen vibrations and protect the delicate internal mechanisms from sudden pressure shocks during the clamping cycle.
Protective Storage Case: Supplied in a custom-fitted, foam-lined aluminum or wooden carrying case to protect the calibration of the gauge during transport and storage in harsh shop environments.
Direct Manufacturer Savings: Bypass trading companies and source essential CNC maintenance and calibration instruments directly from our factory for highly competitive wholesale pricing.
Comprehensive Taper Options: We manufacture tension meters for all major CNC platforms, including MAS 403 BT (BT30, BT40, BT50), as well as DIN 69871 SK and DIN 69893 HSK tapers upon request.
Ready for Immediate Use: Our gauges are pre-filled, bled, and factory-calibrated so they are ready to use the moment you open the box.
Strict Quality Control: Every tension meter is tested on a master calibration press before shipping to ensure the dial readings are absolutely accurate.
Q1: How often should I check my CNC spindle pull force?
A: For machines running production shifts, it is highly recommended to check the spindle pull force every 3 to 6 months as part of a preventative maintenance (PM) schedule. You should also check it immediately if you experience unexplained tool chatter, poor surface finishes, or notice fretting marks (red rust) on your tool holder tapers.
Q2: Does the tension meter come with a pull stud (retention knob)?
A:No. Because pull stud thread sizes, lengths, and head angles vary wildly between different machine tool builders (even for the exact same taper size like BT40), you must install the correct, dedicated pull stud for your specific CNC machine into the back of the gauge before testing.
Q3: What should the reading be for my machine?
A: Pull force specifications vary by machine size and manufacturer. As a general rule of thumb:
BT30: ~ 3.0 kN to 5.0 kN (approx. 300 - 500 kgf)
BT40: ~ 7.0 kN to 9.0 kN (approx. 700 - 900 kgf)
BT50: ~ 15.0 kN to 20.0 kN (approx. 1500 - 2000 kgf) Always consult your specific machine tool builder's maintenance manual for the exact acceptable range.
Q4: Can I repair the gauge if it loses oil or pressure?
A: The hydraulic system is factory-sealed under vacuum to ensure accuracy. If the gauge is dropped, leaks oil, or the needle does not return to zero, it must be returned to the factory or a certified calibration lab for repair, refilling, and recalibration. Do not attempt to open the hydraulic seals yourself.
Diagnose drawbar issues instantly and protect your spindle investment with our High-Precision CNC Spindle Pull Force Gauges.
Contact our sales team today for a complete catalog, technical specifications, and bulk pricing.
