Cut-Off Machine Spindle Stop Structure for Arm Rigidity
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Solution Overview
Problem
Hand-held cut-off machines with compact and filigree support arms face reduced stability and rigidity due to high forces during operation, leading to potential damage, as existing designs prioritize weight optimization over structural integrity.
Innovation Solution
Incorporating a stop element in the arm cover that limits spindle movement perpendicular to the axis of rotation, redirecting forces into the arm cover and subsequently the support arm, thereby reducing the load on the support arm's second end, and using a metal arm cover with reinforcement struts and strategically placed bearing elements to manage these forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the support arm is designed to be compact and filigree to increase cutting depth, then the cutting depth is improved, but the stability and rigidity of the support arm deteriorates
Solution Approach 1:
The support arm is divided into multiple segments with individual bearing seats and bearing elements, allowing each segment to independently support and stabilize the spindle while maintaining overall compactness and filigree design for increased cutting depth
Solution Approach 2:
The support arm combines lightweight structural elements with strategically placed reinforcing features, creating a composite design that maintains rigidity and stability while preserving the compact, filigree appearance necessary for deep cutting applications
2Weight of moving object
If weight optimization is prioritized in the support arm design, then the weight is reduced, but the stability and rigidity deteriorates
Solution Approach 1:
The support arm features localized reinforcement at critical bearing seats and mounting points where forces are concentrated, while other areas remain lightweight and filigree, achieving optimal balance between weight reduction and structural stability
Solution Approach 2:
The support arm is segmented into distinct functional zones with bearing elements and reinforcing struts positioned only where mechanically necessary, allowing weight optimization in non-critical areas while maintaining stability in load-bearing regions
3Stability of the object's composition
If a one-piece support arm design is used to increase stability and rigidity, then the stability and rigidity is improved, but the weight increases
Solution Approach 1:
The support arm is designed as a segmented structure with multiple bearing seats and bearing elements rather than a solid one-piece construction, reducing material usage and weight while maintaining stability and rigidity through strategic placement of support features
4Weight of moving object
If the support arm is designed with numerous openings and recesses to reduce weight, then the weight is reduced, but the stability and rigidity deteriorates
Solution Approach 1:
The support arm incorporates openings and recesses in non-critical areas to reduce weight, while maintaining full structural integrity at bearing seats and force transmission points, achieving weight reduction without compromising stability and rigidity
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
The invention relates to a hand-held cutting grinder, comprising a cutting disk (11), a motor housing including a drive unit, and an arm (16) having a support arm (17) and an arm cover (18). A stop element (41) is provided for the spindle (12) in the arm cover (18) and limits the movement of the spindle (12) in a plane (48) perpendicular to the axis of rotation (13) during operation.