I'll analyze this engineering drawing to identify the key dimensions and specifications of the bracket.
Let me work through the important information systematically:
Main Dimensions:
- Overall length: 88 mm
- Width sections: 33 mm and 22 mm (totaling part of the 88 mm)
- Height/depth: 30 mm
- Side height: 22 mm
- Bottom flange width: 13 mm
- Top section width: 35 mm
- Vertical section height: 21 mm
Hole Specifications:
- 4 holes with diameter 4.5 mm (noted as "4-∅4.5")
- Hole positions: 6 mm from edge, 16 mm between some holes, 3 mm spacing
- Threaded holes: 4-M3×0.5 (4 threaded holes, M3 thread, 0.5 mm pitch)
Features:
- 4 notches with ∅1 (diameter 1 mm)
- Bending radius: R1 (1 mm radius on bends)
Material:
- S/S 304-4B (Stainless Steel 304, finish 4B)
Scale:
- 1:1 scale (actual size)
- Units in millimeters (mm)
Surface Roughness Requirements:
The table shows various surface roughness requirements (Ra values):
- 1.6a: 6.35 μm
- 3.2a: 12.55 μm
- 6.3a: 25S μm
- 12.5a: 50S μm
Machine Tolerances:
Different tolerance levels based on dimension ranges:
- 0.5-6 mm: ±0.1
- 6-30 mm: ±0.2
- 30-120 mm: ±0.3
- 120-400 mm: ±0.5
- 400-1000 mm: ±0.8
- 1000-2000 mm: ±1.2
This is a technical drawing for a metal bracket with specific mounting holes, dimensions, and manufacturing tolerances. The bracket appears to be designed for mounting purposes with both clearance holes (∅4.5) and threaded holes (M3).
Final Answer:
This is an engineering drawing for a stainless steel bracket (S/S 304-4B) with overall dimensions of 88 mm × 30 mm. Key features include: 4 clearance holes (∅4.5 mm), 4 threaded holes (M3×0.5), 4 notches (∅1 mm), and R1 bending radius. The drawing specifies machine tolerances ranging from ±0.1 mm to ±1.2 mm depending on dimension size, and surface roughness requirements from Ra 6.35 to 50 μm. Scale is 1:1 in millimeters.
Parent Tip: Review the logic above to help your child master the concept of mechanical drawing worksheet.
