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MP | Single Channel Underpinner

Product Number: 178610004CE

Our U-500 is recommended for high-volume production facilities that require the primary use of a single sized V-Nail for frame joining. The U-500 has the same user-friendly, touch screen interface as our U-600 Underpinner. The only difference between the two models being the U-500 has single channel capacity compared to a multi-channel with the U-600 unit.

With data storage of 5,000 different frame profiles, the operator can easily recall any frame profile alphabetically, numerically or by using the bar code reading option.

The U-500 is equipped with both a horizontal and vertical clamping mechanism to securely hold the moulding during the V-Nail insertion process.

The U-500 now includes a new operating function with its C.A.P.S (Computerized Air Pressure System) feature. See tab below for complete details.

Former Model Reference - Alfamacchine – M4 Memory Program

Computerized Air Pressure System

Alfamacchine’s U-500 Computerized Air Pressure System (C.A.P.S.) is the latest operating feature for frame joining eliminating the need to making manual air pressure adjustments for the Vertical Clamping Mechanism. The software includes the functionality of applying a soft vertical clamping motion reducing moulding damage with soft materials or delicate finishes.

This new system provides the following production features...

  • Eliminates the need of making manual air pressure adjustments for Vertical Clamping Mechanism
  • Maximizes production efficiently with pre-set clamping pressures

  • Eliminates moulding material damage by controlled vertical clamping pressure

  • "Soft" vertical clamping option reducing the chance of moulding surface damage with very soft materials or surfaces with gesso or other delicate finishes

To utilize this new feature, the operator stores in the air pressure values needed depending on the moulding hardness for each of the frame profiles stored in memory. By setting a pressure setting into the memory database, programs recalled through the key pad or barcode scanning option automatically sets the clamping air pressure needed.

All new equipment purchases for the U-500 and U-600 now include the C.A.P.S feature and a field retrofit kit, P/N 298390450, is available for upgrading current customer machines looking to use this new operating feature.

Purchase Package
  U-500 Purchase Package
(1) 7MM Nail Head
(1) 10MM Nail Head
(1) 12MM Nail Head
(1) Single Vertical Positive Placement Clamp
(1) Single Metal Pressure Plate
(1) Double Metal Pressure Plate
(2) Blue Rubber Pads (for SW)
(2) Yellow Rubber Pads (for MW)
(2) Black Rubber Pads (for HW)
(1) C.A.P.S Operating Software Feature
(1) Adjustable Fence - 3 knobs
(1) Front Horizontal Clamp
(1) 3 Stage Air Pressure Filter Regulator
(1) 4mm Allen wrench
(1) 5mm Allen wrench
(1) 6mm Allen wrench
(1) 8mm Allen wrench
(1) Touch screen PC Panel
(4) Machine base levelers
(1) Floor Stand
(1) Machine manual
Power Requirements

115/220 Volt 50/60 Hz.
Compressed Air 4NI at 5 Bar
CE Compliant

Replacement Parts & Accessories

Replacment Clamping Pads

P/N Description
397100003 Blue Replacement Rubber Pad (recommended for SW)
397100002 Yellow Replacement Rubber Pad (recommended for MW)
397100001 Black Replacement Rubber Pad (recommended for HW)


Replacement Nail Heads

394950010 Nail Head – 3mm
394950060 Nail Head – 5mm
394950020 Nail Head – 7mm
394950030 Nail Head – 10mm
394950040 Nail Head – 12mm
394950050 Nail Head – 15mm

Extension Wings

P/N Description
291650010 Extension Wings Kit
P/N Description
244120130 Magnetic Base for Clamping Assembly
242230300 Single Metal Pressure Plate
397100005 Magnetic - Single Metal Pressure Plate
242230020 Double Metal Pressure Plate
242230092 Double Hydraulic Pressure Clamp
242230010 Round Pressure Pad, Felt
242230040 Round Pressure Pad, Vulkolan
805500002 Barcode Scanner
298390380 Single Vertical Positive Placement Clamp
243180020 Fixed Fence - 90°
Sales & Technical Documents

U500-U600 EN 1.png

U-500 AlfaASellsheet 1-9-15.jpg

Instruction Manual

- Italian Version

U-500 Literature

- Italian Version
- Spanish Version
- French Version

- German Version




Unique Performance Features

  • User friendly touch-screen P.C. operation with data storage for 5,000 frame profiles
  • Integrates Bar Code Scanner option for production efficiency
  • Equipped with a vertical, double hydraulic pressure clamp
  • Features a three knob adjustment fence for compensating moulding cuts
  • Join either from front or back of machine
  • Easy table tilt adjustment
  • Machine handles all types of wood, plastics, and MDF materials 

Frame Joining Capabilities

Moulding Width
(min to max)
Moulding Height
(min to max)
Max Distance
Between V-Nails
¼” up to 4 ½”
(6-105 mm)
¼” up to 3 ¼”
(6-80 mm)
5 ¾”
Pre-set V-Nail
Position Stops
V-Nail Sizes V-Nail Channel
Multiple 5, 7,10,12,15 mm
220 V-Nails/channel

Machine Dimensions & Weight

Length: 680mm (27")
Width: 800 (31 1/2")
Height: 1310 (51 1/2")
Weight: 140kg (309lbs.)

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