Machined Bar Stock Floor Jack Lift Arm Assembly
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Solution Overview
Problem
Traditional lift arms for garage floor jacks, made from castings, require lengthy and expensive machining processes, resulting in inferior surface finish, material strength, and dimensional accuracy compared to machined metal bar stock components.
Innovation Solution
The lift arm is constructed from machined metal bar stock, comprising side plates, block plates, pins, and spacer plates, coupled using fasteners, which simplifies and cost-effectively enhances machining, providing superior strength and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional casting process is used to manufacture lift arms, then manufacturing complexity is reduced, but surface finish quality deteriorates and material strength decreases
Solution Approach 1:
The lift arm is divided into multiple separate components (side plates, block plates, spacer plates, pins) that are manufactured individually using precision machining from metal bar stock, then assembled together. This segmentation allows each component to be machined to high precision standards while maintaining manufacturing feasibility, resolving the contradiction between ease of manufacture and surface finish quality.
2Ease of manufacture
If traditional casting process is used to manufacture lift arms, then manufacturing cost is reduced, but material strength and dimensional accuracy deteriorate
Solution Approach 1:
By segmenting the lift arm into multiple precision-machined components from metal bar stock, each component achieves superior material strength and dimensional accuracy. The modular design allows for optimized material selection and heat treatment for each component, ensuring high strength requirements are met while maintaining cost-effectiveness through standardized machining processes.
Solution Approach 2:
The lift arm employs a composite structure combining multiple metal components (side plates, block plates, spacer plates, pins) that can be made from different steel grades or aluminum alloys optimized for specific functional requirements. This composite approach allows each component to utilize the most appropriate material properties for its function, achieving overall superior strength and dimensional accuracy.
3Productivity
If traditional casting process is used to manufacture lift arms, then production time is reduced, but machining time and cost increase
Solution Approach 1:
Segmenting the lift arm into standardized components enables parallel manufacturing of multiple parts simultaneously. Each component can be machined independently using efficient CNC processes, and assembly is simplified through pre-drilled fastener apertures and standardized connection interfaces, reducing total production time despite the multi-component nature.
Solution Approach 2:
Fastener apertures and mounting features are pre-machined into each component during the initial machining operation, eliminating the need for secondary operations or post-assembly drilling. This preliminary action reduces total machining time and ensures precise alignment during assembly, resolving the time loss concern.
Data Source
AI summary
A lift arm of a floor jack is composed of a number of components made from metal bar stock. The lift arm is adapted to transfer power and motion from a power unit to a saddle, which is adapted to be placed at a lift point of the vehicle, thereby applying pressure to the lift point and raising the vehicle.