Belmont Equipment Precision AT50

$65,000 – $110,000 Updated 2026-03-17

Key Specifications

Work Tank Dimensions

610 x 510 x 340 mm (W x D x H)

X/Y/Z Travel

300 x 200 x 200 mm

Max Workpiece Weight

450 kg (990 lb)

Dielectric System

Hydrocarbon oil with self-contained filtration and temperature control

Surface Finish Ra

< 0.5 µm (with finishing electrode conditions)

Control System

Digital adaptive CNC with orbital motion programming

Overview

The Belmont Equipment Precision AT50 is a CNC sinker EDM machine designed for toolroom and precision manufacturing environments requiring reliable sinker EDM capability at a practical price point. Belmont Equipment, based in Madison Heights, Michigan, has served North American toolmakers and job shops since 1947, and the AT50 reflects the company's focus on accessible, dependable EDM solutions for the industrial toolroom market.

The AT50 features a servo-controlled Z-axis ram with digital spark gap control and an adaptive generator system capable of machining hardened tool steels, carbide, and specialty alloys. The machine's dielectric system includes a self-contained oil reservoir with filtration and temperature control, providing stable machining conditions over extended production runs. The CNC control offers straightforward programming for orbital electrode motion, multi-step electrode sequences, and automatic surface finish stepping from roughing through finishing conditions.

The machine's robust cast iron structure and precision-ground guideways provide the mechanical stability needed for consistent sinker EDM results in demanding toolroom service. The work tank is sized for practical die and mold work including small to medium-sized injection mold cores, stamping die components, and specialty tooling inserts. Belmont supports the AT50 with direct applications engineering assistance and maintains a North American parts inventory for rapid service response.

The AT50 occupies a niche in the North American market as a domestically-supported alternative to Asian-manufactured sinker EDM machines, with Belmont providing localized technical support, training, and applications consultation that appeals to shops that prefer working directly with a U.S.-based supplier rather than navigating overseas OEM service channels.

Full Specifications

Parameter	Value
Work Tank Dimensions	610 x 510 x 340 mm (W x D x H)
X/Y/Z Travel	300 x 200 x 200 mm
Max Workpiece Weight	450 kg (990 lb)
Dielectric System	Hydrocarbon oil with self-contained filtration and temperature control
Surface Finish Ra	< 0.5 µm (with finishing electrode conditions)
Control System	Digital adaptive CNC with orbital motion programming
Generator Power	20 A peak discharge current
Machine Weight	approx. 1,600 kg (3,527 lb)

Strengths & Limitations

Strengths

Lower capital cost versus Japanese and European sinker EDM machines of similar work envelope
U.S.-based Belmont Equipment provides direct North American applications support and service
Self-contained dielectric system simplifies installation with no external plumbing required
Practical work envelope suits the majority of toolroom die and mold insert applications

Limitations

Surface finish capability (Ra < 0.5 µm) is modest compared to premium sinker EDM machines
Smaller brand recognition limits resale value versus Sodick, Makino, or Mitsubishi Electric machines
Limited automation options — not designed for lights-out multi-electrode production environments

Best For

Toolrooms and small mold shops seeking affordable sinker EDM with direct U.S.-based support Job shops adding sinker EDM capability for stamping die repair and tooling insert production Training environments and apprenticeship programs introducing EDM technology at accessible cost

Frequently Asked Questions

01 Who is Belmont Equipment and where are their machines made?

Belmont Equipment & Manufacturing is a Madison Heights, Michigan-based company that has been supplying EDM equipment and supplies to North American toolmakers since 1947. Belmont distributes and supports sinker EDM machines with a focus on the North American toolroom and job shop market, providing localized service and applications support.

02 What electrode materials work best with the Belmont AT50?

The AT50 works with standard sinker EDM electrode materials including graphite (isostatic grade), copper, and copper-tungsten. Graphite is the most common choice for die and mold work due to its fast machinability and good removal rates. Copper is preferred for fine finishing and carbide workpiece applications.

03 Is the Belmont AT50 suitable for mold production or primarily for toolroom repair work?

The AT50 is capable of both new mold component production and toolroom repair work. Its practical work envelope and straightforward CNC control make it well-suited for small to medium injection mold inserts, stamping die components, and specialty tooling production. For high-volume multi-electrode automated production, a machine with ATC capability would be more appropriate.