Underpinners

Engineered for woodworkers who need fast, consistent, and accurate corner joining on door‑frame mouldings, architraves, skirtings and window-frame profiles, the U200P combines compact design with powerful pneumatic performance.

Its spring-loaded pull-pin mechanism lets you adjust the top clamp quickly to suit different moulding heights, while the double-piston clamp ensures even pressure across the profile for secure, clean mitred joints. A dual-function foot pedal controls both the clamping and V-nail insertion separately — so you can clamp first, check alignment, then insert the fastener.

This machine supports wide timber sections — capable of handling mouldings up to 130 mm in width and 80 mm in height — making it highly versatile for a range of joinery work. Built to deliver repeatable, production-quality results, it’s perfectly suited for busy workshops or bespoke frame-making.

Features & Benefits

Pneumatic Operation: Reduces physical effort compared to manual machines, giving smoother, more consistent joining cycles.

Spring‑Loaded Top Clamp: Quick adjustment to match differing moulding heights, aiding flexibility in workshop use.

Double‑Piston Clamping: Distributes pressure evenly across the timber profile — ideal for hardwood mitres.

Dual‑Function Foot Pedal: Controls clamping and V-nail insertion separately, giving more control over alignment before the join is secured.

Wide Moulding Capacity: Joins mouldings up to 130mm wide and 80mm high, making it suitable for substantial timber profiles.

High V‑Nail Capacity: Can stack up to 220 V-nails, reducing downtime for refills.

Flexible V‑Nail Sizes: Compatible with 7mm, 10mm & 12mm V-nail blocks (5mm & 15mm available as optional extras).

Fixed Back Fences: Provides stable reference surfaces — helps ensure accurate mitres every time.

Compact Bench‑Top Form: Small footprint helps integrate the machine into any joinery workshop layout.

Durable, Proven Design: Built by Alfamacchine in Italy, rated for sustained production use.

Technical Specifications

• Operation Type: Pneumatic
• V‑Nail Insertion Positions: 2 fixed (unlimited stacking in between)
• Max Distance Between V‑Nails: 180 mm
• Max Moulding Height: 80 mm
• Machine Footprint (Work Surface): 330 mm × 440 mm
• Dimensions (W × L × H): 450 × 750 × 1,280 mm
• Weight: ~35 kg
• V‑Nail Channel Capacity: 220 V-nails

Designed for efficient joining of hardwood and softwood mouldings during the construction of door frames, architraves, skirting boards and window frames, this semi-automatic underpinner delivers reliable, repeatable results.

With its V-nail carriage locking mechanism, the U300 makes it easy to stack V-nails when working on taller profiles. Its spring-loaded pull-pin setup allows quick adjustment of the top clamp to suit different moulding heights, while the double-piston clamp ensures even pressure for secure joins. A front clamp pulls the corners tightly together for accurate mitres.

Operation is straightforward: a pneumatic foot pedal controls both clamping and V-nail insertion.

1. Press the pedal halfway down to apply top and front clamp.
2. Press fully down to drive the V-nail.
3. Lift halfway up to keep the moulding clamped and stack another nail.
4. Lift fully to release clamps and move to the next insertion point.

More Info

• Uses Alfamacchine Power Twist V-nails
• Top L-clamps have interchangeable polymer pads, adaptable to different moulding profiles
• Adjustable back fences to optimise corner alignment
• Can be set up for front or back working, depending on workflow
• V-nail blocks are changed using a hex key; supplied sizes: 7 mm, 10 mm, 12 mm (with 5 mm & 15 mm available as extras)
• Supplied with full boxes of 7 mm, 10 mm & 12 mm V-nails
• 12-month manufacturer’s warranty

Technical Capability

• Semi-automatic pneumatic operation
• Fixed V-nail insertion positions: 2 (with unlimited stacking in between) 
• Maximum spacing between V-nails: 80 mm
• Maximum moulding height: 80 mm

Designed for efficient, high-quality corner joining of mouldings used in door frames, architraves, skirting boards and window frames, the U300P Semi‑Auto Production Underpinner is built for repeat production work. Its semi-automatic, pneumatic design allows for fast, consistent insertion of V‑nails across many identical pieces.

The machine features a spring-loaded pull-pin mechanism so you can quickly set the top clamp to match your moulding height. A double-piston clamp applies even pressure, and a front clamp pulls corners together for accurate mitres. Thanks to its foot pedal operation, you can control the clamping and V‑nail insertion precisely.

With three preset V‑nail insertion positions, the U300P allows for very consistent, repeatable joining across production runs. After each insert, the pneumatic loader moves the nail head automatically between the preset positions — saving time and reducing user error.

More Info

• Uses Alfamacchine Power Twist V‑Nails
• Top L‑clamps feature interchangeable polymer pads to suit different moulding profiles
• Adjustable back fences let you change the angle and tilt to optimise joint tightness
• Configurable for working from the front or back of the machine
• V‑nail blocks are changed with a hex key; supplied with 7 mm, 10 mm & 12 mm, with optional extras of 3 mm, 5 mm & 15 mm
• Supplied with full boxes of 7 mm, 10 mm & 12 mm V‑nails
• 12‑month manufacturer’s warranty

Technical Specifications

• Operation: Semi-automatic pneumatic
• V‑Nail insertion positions: 3 fixed
• Maximum distance between V‑nails: 125 mm
• Maximum moulding height: 80 mm
• Moulding width range: 6 mm – 80 mm
• Supported V‑nail sizes: 3, 5, 7, 10, 12 & 15 mm
• V‑nail channel capacity: ~220 V‑nails
• Footprint / Weight: 350 mm (W) × 640 mm (L) × 500 mm (H); ~36 kg

Engineered for high-volume joinery production, the U500 Memory Programmable Underpinner is ideal for building door‑frame mouldings, architraves, skirting boards, and window-frame assemblies. You can upload and store profile data for up to 6,000 mouldings, including moulding dimensions, V-nail quantity and position, cycle speed to match wood hardness, and barcode references.

The machine uses a touch-screen interface (with optional barcode scanner) for fast recall of settings, speeding up production and reducing setup time. Its double-piston top clamp applies even, stable pressure, while a front clamp draws the corners in tightly for precise mitred joins.

Foot pedal operation actuates the clamping; you can also configure it to automatically fire the V-nails when clamped. This programmable automation helps maintain consistent quality even on long, repetitive runs.

Key Features

• Stores up to 6,000 moulding profiles — size, V‑nail configuration, cycle speed, barcodes
• Single V-nail channel for dedicated production runs
• Touch-screen control with optional barcode scanner for rapid profile selection
• Double-piston top clamp for even, secure pressure
• Front clamp for corner alignment and tight mitres
• Programmable automatic V‑nail insertion (optional)
• Uses Alfamacchine Power Twist V‑Nails
• Interchangeable polymer pads on top L‑clamps to suit different timber profiles
• Adjustable back fences for optimal corner alignment
• Configurable for either front or back working for ergonomic flexibility
• V‑nail blocks can be changed using a hex key; supplied sizes: 7 mm, 10 mm, 12 mm (optional 5 mm & 15 mm)
• Supplied with full boxes of 7 mm, 10 mm, 12 mm V‑nails
• 12‑month manufacturer’s warranty

Technical Specifications

• Operation: Pneumatic, memory programmable
• V‑Nail insertion positions: 2 fixed + unlimited stacking between
• Max spacing between V‑Nails: 145 mm
• Max moulding height: 80 mm

Built for high‑volume joinery production, the U600 Memory Programmable Multi‑Channel Underpinner is ideal for making door‑frame mouldings, architraves, skirting boards, and window-frame assemblies. You can upload and store profile data for up to 6,000 different mouldings — including dimensions, V‑nail quantity and position, cycle speed (to suit wood hardness), and barcode references.

The machine features a touch‑screen interface (barcode scanner optional) for quick recall of production profiles. A double‑piston top clamp applies even vertical pressure, and a front clamp draws the corner tightly together — ensuring strong, precise mitred joins. Foot-pedal control operates clamping, and you can optionally configure it so V‑nails are fired automatically.

Its standout feature is the five‑channel V‑nail magazine, which holds different V‑nail sizes simultaneously — enabling uninterrupted production, especially when switching between different moulding profiles or joint types.

Key Features

• Memory programmable storage for up to 6,000 moulding profiles
• Five V‑nail channels for uninterrupted operation across different V‑nail sizes
• Double‑piston top clamp for consistent, strong pressure across the timber profile
• Front clamp ensures tight, gap-free mitred corners
• Touch‑screen control with optional barcode scanner for fast profile recall
• CAPS (Computerized Air Pressure System): Automatically adjusts vertical clamping pressure for different moulding materials — reducing the risk of damaging delicate or soft profiles
• Interchangeable polymer pads on L-clamps to suit different moulding shapes and sizes
• Adjustable back fences to optimise corner alignment and tilt
• Can be configured for front or rear operation for ergonomic flexibility
• Supports Alfamacchine Power Twist V‑Nails in sizes 5 mm, 7 mm, 10 mm, 12 mm, 15 mm
• Holds up to 220 V‑nails per channel, for long runs without reloading
• 12‑month manufacturer’s warranty

Technical Specifications

• Operation: Pneumatic, memory programmable
• V‑Nail insertion positions: 2 fixed + unlimited stacking between
• Max distance between V‑nails: 145 mm