Does 2 × 4 ft mean the CNC travel?

Not necessarily. It is a nominal area dimension; end stops, supports, the tool, and machine design reduce usable travel.

Does NEMA 23 specify a torque?

No. It identifies a mounting size class. Torque, current, inductance, and speed curves vary by model.

Can I connect a 4-wire motor to any driver?

Use a compatible bipolar driver rated for the motor phase current. Check the voltage range and limits in both product manuals.

How do I identify the winding pairs?

Use the manufacturer wiring diagram first. If unavailable, check continuity with the motor isolated from electronics and follow a suitable meter procedure.

Can I compare this result with holding torque?

Not to confirm motion at speed. Use the speed-torque curve for the motor, driver, and settings you plan to run.

Does the calculator work for belt or rack drives?

No. This estimate assumes a screw. Other transmissions need their own force-to-drive-shaft torque relationship.

When should I use two gantry motors?

It depends on frame stiffness, transmission, and controller. If used, verify synchronization, squaring, and recovery after lost steps.

2x4 NEMA 23: Axis Estimator & Wiring Guide

Nema23Motor technical guide

Choose the task: estimate torque for a lead-screw axis or review the basic checks before wiring a 4-wire bipolar motor.

CNC lead-screw estimate

Illustrative inputs are shown below. This is not a hardware test or a motor recommendation.

This estimate is for a lead screw or ball screw only. Use efficiency from the screw specification. The model includes acceleration and the additional resistance you enter; it does not calculate cutting force, gravity, backlash, flex, or rotary inertia. Belt and rack drives need a different model.

The result will appear here after the inputs pass validation.

Worked calculation example

Illustrative inputs are shown below. This is not a hardware test or a motor recommendation.

Moving mass: 35 kg
Acceleration: 1.5 m/s²
Additional resistance: 150 N
Screw lead: 5 mm/rev
Efficiency: 40%
Motors sharing the load: 1
Design factor: 2
Target feed rate: 3000 mm/min

F = 35 × 1.5 + 150 = 202.5 N; ideal torque per motor ≈ 0.403 N·m; target with factor 2 ≈ 0.806 N·m; speed ≈ 600 rpm.

What “2x4 NEMA 23” can mean

The query may refer to a CNC with a nominal 2 × 4 ft work area or a 2-phase, 4-wire motor. Those are different details: machine size alone does not determine motor torque, and lead count does not define a universal current rating.

Work area

2 × 4 ft is nominally 609.6 × 1219.2 mm; usable travel depends on the machine design and is not necessarily its outside dimensions.

NEMA size

A NEMA 23 label does not replace model data: compare torque available at operating speed with the axis requirement.

Four leads

On a 2-phase bipolar motor, four leads usually correspond to two windings; confirm pairs and current in that motor’s datasheet.

Method, evidence, and limits

The screw estimate applies Thomson’s linear-to-rotary torque formula (Lead Screws, p. 49). Oriental Motor explains that torque at speed depends on the motor, driver, and settings. Sources checked September 30, 2026.

Topic	Primary source	Application
Screw torque	Thomson, Lead Screws (PDF, p. 49)	Torque = force × lead ÷ (2π × efficiency); efficiency depends on the screw.
Torque at speed	Oriental Motor, Speed-Torque Curves	The curve shows torque available at a speed for a particular motor-driver combination.
Bipolar wiring	Oriental Motor, Unipolar/Bipolar Connections	Wiring and electrical ratings vary by motor model and winding.

Sources checked: September 30, 2026. Always confirm the datasheets for the exact motor and driver.

What to verify before choosing

Question	Data to verify	Limit of this page
Is this a 2 × 4 ft CNC?	Usable travel, mass per axis, transmission, and target speed.	Work area alone does not determine a motor or torque.
Does the motor have 4 leads?	Winding pairs, phase current, and the exact model diagram.	Do not use generic colors or ratings as specifications.
Does the axis use a screw?	Lead and efficiency stated by the manufacturer.	Belts and racks need a different mechanical relationship.
Is torque sufficient at speed?	Motor speed-torque curve with the intended driver, current, and voltage.	Holding torque is not dynamic torque.

Risks and mitigations

Validate the complete system

An estimate that omits cutting or friction can understate the load and cause lost steps. Incorrect current settings can overheat the motor or driver. For a gantry with two motors, confirm the controller’s squaring method and lost-step detection. Check each risk against measurements and manuals, then test at low speed before cutting material.

Frequently asked questions

Need a review of a specific setup?

Include the motor and driver datasheets, transmission type, moving mass, and target speed for an application review.

Ask an engineer to review the selection

Worked calculation example

Illustrative inputs are shown below. This is not a hardware test or a motor recommendation.

Moving mass

35 kg

Acceleration

1.5 m/s²

Additional resistance

150 N

Screw lead

5 mm/rev

Efficiency

40%

Motors sharing the load

Design factor

Target feed rate

3000 mm/min

F = 35 × 1.5 + 150 = 202.5 N; ideal torque per motor ≈ 0.403 N·m; target with factor 2 ≈ 0.806 N·m; speed ≈ 600 rpm.

What “2x4 NEMA 23” can mean

Work area

2 × 4 ft is nominally 609.6 × 1219.2 mm; usable travel depends on the machine design and is not necessarily its outside dimensions.

NEMA size

A NEMA 23 label does not replace model data: compare torque available at operating speed with the axis requirement.

Four leads

On a 2-phase bipolar motor, four leads usually correspond to two windings; confirm pairs and current in that motor’s datasheet.

Method, evidence, and limits

Topic	Primary source	Application
Screw torque	Thomson, Lead Screws (PDF, p. 49)	Torque = force × lead ÷ (2π × efficiency); efficiency depends on the screw.
Torque at speed	Oriental Motor, Speed-Torque Curves	The curve shows torque available at a speed for a particular motor-driver combination.
Bipolar wiring	Oriental Motor, Unipolar/Bipolar Connections	Wiring and electrical ratings vary by motor model and winding.

Sources checked: September 30, 2026. Always confirm the datasheets for the exact motor and driver.

What to verify before choosing

Question	Data to verify	Limit of this page
Is this a 2 × 4 ft CNC?	Usable travel, mass per axis, transmission, and target speed.	Work area alone does not determine a motor or torque.
Does the motor have 4 leads?	Winding pairs, phase current, and the exact model diagram.	Do not use generic colors or ratings as specifications.
Does the axis use a screw?	Lead and efficiency stated by the manufacturer.	Belts and racks need a different mechanical relationship.
Is torque sufficient at speed?	Motor speed-torque curve with the intended driver, current, and voltage.	Holding torque is not dynamic torque.

Risks and mitigations

Validate the complete system

2x4 NEMA 23: Axis Estimator & Wiring Guide

Worked calculation example

What “2x4 NEMA 23” can mean

Method, evidence, and limits

What to verify before choosing

Risks and mitigations

Frequently asked questions

Does 2 × 4 ft mean the CNC travel?

Does NEMA 23 specify a torque?

Can I connect a 4-wire motor to any driver?

How do I identify the winding pairs?

Can I compare this result with holding torque?

Does the calculator work for belt or rack drives?

When should I use two gantry motors?

Related engineering guides

Need a review of a specific setup?

2x4 NEMA 23: Axis Estimator & Wiring Guide

Worked calculation example

What “2x4 NEMA 23” can mean

Method, evidence, and limits

What to verify before choosing

Risks and mitigations

Frequently asked questions

Does 2 × 4 ft mean the CNC travel?

Does NEMA 23 specify a torque?

Can I connect a 4-wire motor to any driver?

How do I identify the winding pairs?

Can I compare this result with holding torque?

Does the calculator work for belt or rack drives?

When should I use two gantry motors?

Related engineering guides

Need a review of a specific setup?