Stepper Motor & Ballscrew CNC Conversion Kit for Sieg SX2L

Manual to CNC Mechanical Conversion Kit

Mechanical CNC conversion kit designed to convert Sieg SX2L model mini milling machines from manual operation to CNC-ready configuration. This kit upgrades the machine with ballscrews and stepper motor connections without requiring permanent modifications.

ATTENTION BEFORE ORDER: To install the Z-axis on Sieg SX2L machines, the spindle motor must be relocated to the front of the machine.

Pre-Order & Payment Information

This product is manufactured upon pre-order.

• No payment is required when placing a pre-order.

• You may cancel your pre-order at any time before shipment.
• You will be notified when manufacturing is complete and the kit is ready for dispatch, at which point payment will be requested.

• For estimated manufacturing lead time, please contact via the contact form.

Key Features

• Excellent mechanical design compatible with Sieg SX2L model mini mills.
• No permanent modification required for installation.

• No drilling, cutting, grinding, tapping or hole enlargement required.

• All axes equipped with combined radial and axial bearing systems.
• Backlash-free operation even under heavy and long-term working conditions.

• Compact, rigid design requiring no lubrication or maintenance.

• Precision stepper motor coupling design that does not damage motor shafts.

• No reduction or shortening of axis travel after installation.

• SFU1204 ballscrews (12 mm diameter, 4 mm pitch).

• C5 precision grade with backlash less than 0.01 mm.

• Ball nut rigidly fixed against both axial and radial loads.

• Z-axis driven via 1:2 timing pulley reduction.

• Compatible with NEMA 23 and NEMA 24 stepper motors.

• Strong, non-flexing, ergonomic and compact Z-axis drive mechanism.

• Secure and rigid connection to the spindle body.

• Compatible with mbbbilici brand belt drive conversion kits.

• Over 15 years of proven customer satisfaction.

Stepper Motor Compatibility

Please specify the stepper motor shaft diameter and motor type when placing your order.

For NEMA 24 stepper motors, there are two different mounting hole patterns available: 47.14 mm and 50 mm. If you are using NEMA 24 stepper motors, please indicate the mounting hole pattern dimensions in the order notes.

Motor Type Options:

• NEMA 23 stepper motors, square mounting hole pattern 47.14 mm
• NEMA 24 stepper motors, square mounting hole pattern 47.14 mm
• NEMA 24 stepper motors, square mounting hole pattern 50 mm

Motor Shaft Diameter Options:

• 8mm

• 9.5mm

• 10mm

Package Contents

• Ballscrews and ball nuts for all axes.

• Stepper motor mounting and coupling components.

• Bearings and bearing housings.

• Required mounting bolts.

• Assembly instructions.

Shipping Information

• Worldwide international shipping via DHL, UPS, DPD or Spring.
• Transit time after dispatch: 3–5 business days worldwide.

• Shipping options are visible in the cart before creating a pre-order.
• No registration is required to view shipping options.

If no shipping option appears for your country, please contact via the contact form so it can be added.

Technical Note

This product consists solely of mechanical CNC conversion components intended to prepare a manual mini mill for CNC operation.

It does not include stepper motors, electronic control systems, drivers, power supplies, or complete machine assemblies.