Edge Clamp T-Slot Fixturing for CNC Woodworking Access
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Solution Overview
Problem
Existing woodworking fixturing systems face challenges in securing workpieces without obstructing tool access or causing tool interference, particularly in CNC routers, and existing T-slots in wood-based materials are inadequate for applying high clamping forces.
Innovation Solution
A fixturing system utilizing a T-nut and T-slot configuration optimized for wooden surfaces, featuring angled clamping surfaces and a stabilizer portion, which allows for high clamping forces while maintaining a low profile and preventing tool interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If top-thrusting holds are used to secure the workpiece, then the workpiece is firmly held against the fixturing plate, but the holding device protrudes substantially above the top surface of the workpiece, blocking tool access and increasing the risk of tool crash
Solution Approach 1:
The clamp transitions from a conventional top-thrusting design that protrudes vertically above the workpiece to a low-profile design where the clamping force is applied through a horizontal T-slot mechanism. The T-nut engages with the T-slot and applies clamping force through its clamping surfaces, eliminating the need for vertical protrusion and enabling tool access to the entire top surface of the workpiece.
2Ease of operation
If side-thrusting holds are used to restrain the workpiece, then tool access to the top surface is permitted, but substantial surface area outboard of the workpiece sides is consumed, and tool access to side surfaces is blocked
Solution Approach 1:
The clamp applies clamping force locally at the interface between the T-nut clamping surfaces and the workpiece edge, rather than requiring extensive side-thrusting surfaces. The T-nut's clamping surfaces concentrate the clamping force at a specific location on the workpiece edge, reducing the overall surface area required while maintaining effective restraint.
3Ease of operation
If through holds are used to secure the workpiece, then tool access to side surfaces is permitted, but holes for through fasteners are created which may be unacceptable, and the fixturing surface is progressively damaged
Solution Approach 1:
The clamp removes the need for through-fasteners that penetrate the workpiece by using a surface-mounted T-nut that engages with a T-slot. The clamping force is applied through the T-nut's clamping surfaces against the workpiece edge without creating holes or penetrating the workpiece material, thereby eliminating the harmful effects of through-holes and progressive damage to the fixturing surface.
4Ease of operation
If conventional T-slots in wood-based materials are used, then the fixturing system can be assembled, but the T-slots are inadequate for applying high clamping forces due to material limitations
Solution Approach 1:
The T-slot geometry is optimized for wood-based materials by adjusting critical parameters such as slot width, depth, and wall thickness to accommodate the mechanical properties of wood. The T-nut is designed with clamping surfaces angled between 10-45 degrees relative to the slot axis, creating a wedging action that multiplies the clamping force. This optimized geometry enables conventional wood-based fixturing plates to withstand high clamping forces that would otherwise be inadequate.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides secure workpiece immobilization with minimal interference, enabling efficient tool access and high clamping forces suitable for wood-based materials, while minimizing stress on the fixturing surface.
Implementation Method 1
a threaded fastener extending through the aperture from the top surface and into the screw-threaded bore
Implementation Method 2
Friction forces between the bottom of the workpiece and the fixturing surface prevent the workpiece from moving laterally
Data Source
AI summary
An edge clamp for use in clamping a workpiece to a fixturing plate, wherein the workpiece includes a top surface and one or more side, the edge clamp comprising: a body having a top surface, wherein a clamp portion extends laterally from the body, and wherein a stabilizer portion extends downwardly from the body; an aperture extending through a thickness of the body from the top surface; wherein the clamp portion includes a lower surface having at least one clamp pad, and wherein the stabilizer portion includes a side surface having at least two registration surfaces separated by a stabilizer groove.