Rigid Tapping
Rigid tapping synchronizes spindle rotation with axis feed so the tap advances at the programmed thread lead without relying on a tension-compression holder to absorb mismatch.
How Rigid Tapping works
- The CNC links spindle position/speed and Z-axis feed for the thread pitch.
- The spindle reverses and the axis retracts in synchronization with the tap.
- Runout, correct pilot-hole size, toolholding, lubrication and chip control remain critical.
- Peck or chip-breaking strategies may be available, but machine and control implementation vary.
What to compare
| Control option | Installed rigid-tap capability, supported cycles and repeat/re-entry behavior. |
|---|---|
| Spindle feedback | Encoder/control condition and demonstrated synchronization. |
| Range | Permitted rpm, feed, pitch, depth and retract behavior for the machine. |
| Tooling | Tap type, holder, runout, coolant and work material. |
| Recovery | Tap-recovery cycle, restart procedure and operator documentation. |
Used-equipment inspection checklist
Verify the machine
- Confirm the option is installed and enabled on the control.
- Tap a representative material, pitch and depth.
- Inspect thread form with the correct gauges.
- Check holder and spindle runout.
- Test safe recovery procedure with qualified personnel before production.
Verify the transaction
- Match the serial number and configuration to the seller's description.
- Identify every included and excluded accessory in writing.
- Confirm power, air, coolant, foundation, rigging and relocation requirements.
- Record a time-stamped operating demonstration and measured result.
- Price missing service, software, tooling and recommissioning before comparing offers.
Why this term matters in the used-machine market
Search results and listings often compress a complete production system into one label. Buyers should translate that label into capacity, condition, control generation, included tooling, serviceability and demonstrated output. Sellers improve credibility by disclosing those facts instead of repeating a brochure headline.
Market value is also specific to timing and buyer fit. A capable machine can trade poorly when its configuration is hard to relocate, support or redeploy; a common platform with documented maintenance, current controls and proven output may attract a wider buyer pool.
Related machine-tool terms
Frequently asked questions
Does rigid tapping require a floating holder?
Its purpose is to synchronize motion so a conventional rigid holder can be used, but tooling choice still depends on machine, tap, material and process requirements.
What is G84?
On many CNC mills, G84 invokes a right-hand tapping canned cycle; exact behavior and parameters are control-specific.
Sources and further reading
Source roles are explicit: linked organizations describe their own products, programs or technical guidance. The Machine Blue Book independently organizes and interprets that material for education and used-equipment due diligence. A citation is not an endorsement, sponsorship or guarantee.
- Haas Automation — Rigid Tapping. OEM explanation of synchronized spindle rotation and axis feed during rigid tapping. Reviewed September 26, 2026.
- FANUC America — CNC Controllers, Controls and CNC Systems. Current CNC control families and milling/turning control functions. Reviewed September 26, 2026.
See the complete source register, research methodology and editorial standards.