Drill Template Bushing With Dowel Pins And Knurled Body
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Solution Overview
Problem
Existing bushings used as drill guides for templates are prone to spinning, pushing through, or being removed from the template when the drill bit is inserted or removed, leading to potential damage and prolonged downtimes in industrial applications, particularly in the aerospace industry.
Innovation Solution
A bushing design featuring a metal head and body with dowel pins and a left-handed nut fastener that securely mounts within the template, utilizing dowel pins to prevent rotation and knurling for frictional engagement, along with adhesive for stability, ensuring the bushing remains fixed and prevents movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple metal bushing is used to guide the drill bit, then the template is protected from wear, but the bushing can spin, push through, or be removed from the template
Solution Approach 1:
The bushing is divided into multiple functional components: a head portion, a body portion, and a fastener portion. Each segment serves a specific function - the head provides positioning, the body guides the drill bit, and the fastener secures the assembly. This segmentation allows the bushing to achieve stability without requiring a completely complex monolithic structure.
Solution Approach 2:
Dowel pins are pre-installed in the template holes before the bushing is mounted. These dowel pins protrude through the template surface and are positioned to engage with corresponding recesses in the bushing head. This preliminary action ensures that when the bushing is installed, it is immediately prevented from rotating or becoming misaligned, addressing the stability issue before operation begins.
2Reliability
If the bushing is securely fastened to prevent movement, then the template integrity is maintained, but the installation and repair time increases
Solution Approach 1:
The bushing assembly is segmented into removable components (bushing body and fastener) that can be independently handled. The bushing body remains permanently mounted in the template via dowel pins, while only the fastener needs to be installed or removed during maintenance. This segmentation dramatically reduces repair time compared to replacing entire bushing assemblies.
Solution Approach 2:
The fastener portion of the bushing is designed as a consumable component that can be easily replaced when worn or damaged. Rather than replacing the entire bushing assembly or repairing the template, operators can simply remove the damaged fastener and install a new one, minimizing downtime and maintaining template integrity with minimal effort.
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 bushing design effectively prevents rotation, spinning, pushing through, or removal from the template, ensuring the template's integrity and reducing downtime by maintaining the bushing's position, allowing for efficient and repeated use without the need for frequent repairs.
Implementation Method 1
knurling for frictional engagement
Implementation Method 2
along with adhesive for stability
Data Source
AI summary
A bushing for a drill template, the bushing has a head portion for receipt of a drill motor. The head portion has a top surface and a bottom surface with at least one pin protruding from the bottom surface of the head portion. The pin fits within a secondary opening in a template to help retain the bushing in place. A body portion extends from the bottom surface of the head portion. The body portion has an outer surface with a portion of it threaded. The body portion extends through a primary drill hole in the template. A fastening nut having inner threads mates with the outer threads on the body portion to lock the bushing to the template. A bore extends through the head portion and the body portion for receipt of a drill bit.