Dove-Tail Spacer Milling Machine

Dove-Tail Spacer Milling Machine for Transformer Pressboard Spacers

The TRANFOVIA Dove-Tail Spacer Milling Machine is designed for machining transformer cooling-duct spacers from insulation pressboard. Unlike punching-based production, it uses profile milling to complete the spacer shape, groove and edge chamfering in one processing cycle. The process is intended to produce smooth, burr-free spacer surfaces without secondary polishing, while keeping the groove center aligned with the spacer center during machining.

Full automatic and semi automatic configurations are available for different production volumes and workshop requirements. The equipment is particularly suited to spacer processing for large transformers above 110 kV, where slot geometry, surface finish and dimensional consistency need to be controlled across repeated batches.

Equipment Application

The Dove-Tail Spacer Milling Machine is used in transformer insulation workshops to produce cooling-duct spacers with dove-tail, swallow-tail and straight-slot geometries from insulation pressboard. Within a transformer insulation processing system, it performs the dedicated spacer-milling stage after blank preparation and before the finished spacers are assembled into winding cooling-duct structures. For transformer manufacturing machinery buyers, this machine is most relevant when the requirement is individual spacer profile and groove milling rather than continuous strip shaping or pressboard punching.

Main Features

• One-cycle profile, groove and chamfer milling– Profile milling replaces the previous punching route for the specified spacer types, allowing shape milling, slot machining and edge chamfering to be completed in one process.
• Smooth spacer surface with no secondary polishing– Finished spacers have no burr and do not require polishing. The semi automatic specification also states that the processed surface is smooth, flat, non-carbonized and clean.
• Controlled groove depth and center alignment– For the full automatic machine, spacer length accuracy is ±0.2 mm; straight-slot depth accuracy is ±0.2 mm; and the deviation between groove center and spacer center is less than ±0.2 mm.
• Stable vertical clamping during machining– Spacers are pressed and compacted in longitudinal and lateral directions and kept vertical to the loading table, helping maintain groove-center alignment during milling.
• Full automatic and semi automatic configurations– The full automatic model is intended for automated batch milling, while the semi automatic version offers adjustable feeding and a stated maximum machining speed of 260 pcs/min.
• Designed for transformer cooling-duct spacers– The machine is dedicated to transformer pressboard spacer processing and is especially suitable for large-transformer spacer production above 110 kV.

Technical Parameters

Full Automatic Dove-Tail Spacer Milling Machine

Semi Automatic Dove-Tail Spacer Milling Machine

How to Choose the Right Dove-Tail Spacer Milling Machine

Machine selection should start with the spacer drawing and production volume rather than automation level alone. The buyer should confirm spacer length, width, individual thickness, groove type, groove depth, batch clamping quantity and required output.

Full automatic configuration is more suitable when repeated spacer geometries and higher batch output justify automated handling.

The semi automatic configuration is more appropriate for flexible production where the operator still controls material loading and feed.

• Spacer drawing with dove-tail, swallow-tail or straight-slot geometry and required groove depth.
• Minimum and maximum spacer length, width and individual thickness.
• Typical batch quantity, shift output target and product mix.
• Required dimensional tolerance and surface-quality acceptance criteria.
• Available compressed-air supply, workshop power, floor space and dust-collection arrangement.
• Preferred automation level, operator arrangement, spare parts and acceptance-test scope.

FAQ

1. What is a Dove-Tail Spacer Milling Machine used for?

It is used to mill transformer insulation pressboard spacers for winding cooling-duct structures, including dove-tail, swallow-tail and straight-slot spacer geometries.

2. Does the machine punch or mill the spacer?

It uses profile milling. The stated process forms the spacer shape, mills the required slot and chamfers the edge in one machining cycle.

3. What accuracy is specified for the full automatic model?

Spacer length accuracy is ±0.2 mm. Straight-slot depth accuracy is ±0.2 mm, and the groove-center deviation relative to the spacer center is less than ±0.2 mm.

4. What is the difference between full automatic and semi automatic models?

The full automatic model is configured for automated batch spacer milling with a 29.3 kW installed motor capacity and 0.6 MPa pneumatic system. The semi automatic model has 1-3 m/min feeding speed, 340 mm maximum batch clamping thickness and a stated maximum machining speed of 260 pcs/min.

5. Can the machine be used for large power-transformer spacers?

Yes. The product description specifically states that it is especially suitable for processing large-transformer spacers above 110 kV.

6. Does the finished spacer require polishing?

The specified milling process produces burr-free spacers that do not require polishing; the semi automatic data also states that finished surfaces are smooth, flat, non-carbonized and clean.