LDO NEMA23 Motor for Milo — 57STH56-2804A, 1.26 N·m

The NEMA23 stepper the Milo is built around. Genuine LDO Motors 57STH56-2804A — the same motor LDO ships in the official Millennium Mills Milo v1.5 kits. Drop-in for the X, Y and Z axes.

Why NEMA23 (and why this one)

A Milo cuts metal. Unlike a 3D printer flinging a light toolhead through air, a mill drives leadscrews that push the table into the work against real cutting forces. That needs torque and a stiff shaft a NEMA17 can't give. This motor's 1.26 N·m (178 oz-in) holding torque holds position under load and resists back-driving from the cutter, and the fat 6.35 mm (1/4") shaft resists the torsional flex that wrecks accuracy. 2.8 A/phase is the standard drive level for the TMC-class drivers in the Milo's electronics — the matched, validated operating point, not a guess.

Specs

• Genuine LDO Motors hybrid stepper · 57STH56-2804A
• NEMA23, 56 mm body · 1.8° (200 steps/rev) · bipolar, 4-lead
• 2.8 A/phase · 1.26 N·m (178 oz-in) holding torque
• 6.35 mm (1/4") D-cut shaft · ~0.7 kg

You need three

A complete Milo build uses three of these — one each for X, Y and Z (no dual-motor axis). Grab the set.

Motor wires / connectors not included (the official Milo kits ship without them too).