Adjustable Work Table Fence Assembly for Precise Outfeed Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fence assemblies for work tables, such as router tables, face challenges in maintaining precise guide paths due to variations in manufacturing tolerances of metal or polymer extrusions, affecting the quality of finished stock, especially when adjusting for full-face cuts where outfeed support is necessary.
Innovation Solution
An adjustable fence assembly with an outfeed fence adjustment mechanism, featuring first and second mounting posts on the outfeed fence that can move along a fence adjustment axis transverse to the feed direction, allowing for selective adjustment of the offset between infeed and outfeed guide planes, ensuring precise alignment and support for out-fed stock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If tracks are formed from metal or polymer extrusions, then the fence assembly can be manufactured with standard extrusion processes, but the manufacturing tolerances of the extrusions cause variations in the guide path of the sled assembly
Solution Approach 1:
The sled assembly is made movable along the track to allow dynamic adjustment of its position. The adjustment mechanism enables the sled to be repositioned within the track to compensate for variations in track geometry, transforming a static, fixed-position system into a dynamic, adjustable one that can adapt to manufacturing tolerances.
Solution Approach 2:
The system allows changes in the positional parameters of the sled assembly along the track. By adjusting the sled's position within the track, the effective guide path can be optimized to compensate for track manufacturing variations, changing the operational parameters to maintain precision despite manufacturing tolerances.
2Strength
If shims are used to provide backing for the outfeed fence, then the outfeed fence can be supported to prevent flexure, but the adjustment mechanism becomes more complex
Solution Approach 1:
The adjustment mechanism integrates the support function and adjustment function into a single unified structure. The mounting posts serve both to support the outfeed fence and to enable its adjustment, combining multiple functions into one mechanism rather than using separate shims for support and separate mechanisms for adjustment.
Solution Approach 2:
The mounting posts perform multiple functions: they provide structural support for the outfeed fence, enable adjustment of the outfeed fence position, and maintain alignment. This multi-functional design eliminates the need for separate shims and adjustment mechanisms, reducing overall system complexity while maintaining support strength.
Data Source
AI summary
A sled assembly configured to push stock along a fence includes a carriage and rollers mounted at spaced apart positions. The rollers engage the fence to guide movement of the carriage therealong and each has a peripheral portion for being received in a fence race. An adjustable roller mount selectively adjusts the position of the roller to align the peripheral portions of the rollers with the width of the race. An adjustable fence assembly includes an outfeed fence movable relative to an infeed fence. An outfeed fence adjustment mechanism includes mounting posts at spaced apart locations along the length of the outfeed fence movable to drive movement of the outfeed fence along an axis transverse to the feed direction.