Underpinners - Frame Assembly Machines

Semi-Automatic Underpinner

The U-300 is a bench-top, frame joining machine and the most popular model of custom frame shops. It is compact, well constructed, and built for many years of trouble free operation. The design of the U-300 allows the operator to set the front and back measuring stops for V-Nail insertion. The frame is then moved across the nail head and V-Nails are driven or stacked anywhere along the frame joint. The V-Nail insertion is actuated through the use of a pneumatic pedal.

Frame Joining Capabilities

Moulding Width (min to max) Moulding Height (min to max) Max Distance Between V-Nails (stroke) Pre-set V-Nail Position Stops V-Nail Sizes V-Nail Channel Capacity
¼” up to 3 3/4” (6-60 mm) ¼” up to 3 ¼” (6-80 mm) 3 1/4” (80 mm) Multiple 5, 7,10,12,15 mm (SW-HW-HDF) 220 V-Nails/channel
  • Unique Performance Features
    • Features pneumatic loader to eliminate nail jams
    • “Soft Clamping” pneumatic feature for damage free joints
    • Quick-change, magnetic pad hold down feature fitting most moulding profiles
    • Small table-top footprint needed – 12” (305mm) wide x 19” (483mm) length x 14” (356mm) high
    • Operates only with pneumatic air, no electrical hook-up needed
    • Dual function foot pedal for separate control of mould clamping and V-Nail insertion
    • Designed with a unique, trouble free piston V-Nail driver block-blade system for years of dependable single and multi-stacking operations
Height456mm (18")
Width300mm (11 ¾")
Weight32kg. (70lbs.)
Length485mm (19")
Electrical Specifications
Technical Data