Quantity Survey professionals in Kenya rely heavily on precise technical drawings to prepare accurate cost estimates, manage contracts, and oversee construction projects. Mastery in using and maintaining drawing equipment and materials is essential to ensure clarity, accuracy, and professionalism in all documentation submitted to clients, contractors, and regulatory bodies. This chapter focuses on identifying key drawing tools and maintaining them to extend their lifespan and guarantee consistent quality in quantity surveying work.

1.1 Identification and care of drawing equipment

This topic introduces the essential drawing equipment used by quantity surveyors and the best practices for their upkeep. Proper identification and maintenance of tools help reduce errors in measurements and drawings, which directly impacts project budgeting and timelines. In Kenya’s competitive construction sector, well-maintained equipment reflects professionalism and supports compliance with national standards such as those from the Kenya Bureau of Standards (KEBS).

1.1.1 Drawing Equipment: Specifications and Uses

• Drawing boards must be kept clean and free from scratches to avoid interference with the drawing surface.
• T-squares and set squares require regular checking for straightness and integrity of edges to maintain accuracy.
• Compasses should be lubricated occasionally and have their pencil leads sharpened for smooth arcs.
• Mechanical pencils need lead refills and proper storage to prevent lead breakage.
• Erasers should be soft to avoid damaging drawing sheets but firm enough to remove graphite cleanly.
• Protractors must be transparent and unwarped for precise angle measurement.

1.1.2 Proper Handling and Usage of Drawing Equipment

Correct handling of drawing tools ensures precision and prolongs tool life, which is critical in producing accurate quantity surveying drawings. Kenyan quantity surveyors working in offices or on-site must adopt consistent handling techniques to avoid equipment damage and drawing errors.

• Always place tools on the drawing board gently to avoid dents or scratches.
• Use the T-square by aligning it firmly with the board’s edge to maintain straight horizontal lines.
• Hold set squares steadily when drawing angles to prevent slippage and inaccurate lines.
• When using the compass, adjust the radius smoothly without forcing the legs beyond their limits.
• Use mechanical pencils with light pressure to avoid lead snapping and uneven lines.
• Clean erasers before use by rubbing on scrap paper to remove accumulated graphite.
• Store all equipment in designated cases or drawers to prevent exposure to dust and moisture.

1.1.3 Maintenance Practices for Drawing Equipment

Maintenance of drawing equipment is vital for quantity surveyors to ensure longevity and reliable performance, reducing replacement costs and maintaining drawing quality. In Kenya’s diverse climate, proper care protects tools from humidity and dust that could degrade their usability.

• Clean drawing boards regularly with a soft cloth and mild detergent to remove dirt and grease.
• Inspect T-squares and set squares for nicks or bends; smooth edges with fine sandpaper if necessary.
• Lubricate compass joints with light machine oil to maintain smooth movement.
• Replace worn mechanical pencil leads promptly and check mechanisms for jams.
• Store erasers in airtight containers to prevent drying and crumbling.
• Keep protractors flat and avoid stacking heavy objects on them to prevent warping.
• Schedule monthly equipment checks to identify and address wear or damage early.

1.1.4 Consequences of Poor Equipment Care in Quantity Surveying

Neglecting the care of drawing equipment can lead to inaccurate measurements, poor-quality drawings, and ultimately flawed quantity surveys. This affects cost estimation, project timelines, and client trust, which are critical aspects of a quantity surveyor’s professional responsibility in Kenya.

• Inaccurate lines and angles can lead to wrong quantity take-offs, resulting in budget overruns.
• Damaged tools may produce inconsistent drawings, causing disputes during tendering or construction.
• Frequent replacement of poorly maintained equipment increases operational costs.
• Poor-quality drawings reflect unprofessionalism, potentially damaging the quantity surveyor’s reputation.
• Errors in drawings can delay project approvals by regulatory bodies such as the National Construction Authority.

Chapter Summary

This chapter covered the identification and proper care of various drawing equipment, emphasizing the importance of maintaining tools such as pencils, compasses, and rulers to ensure accuracy and longevity. It also addressed the identification and handling of drawing materials, including papers and inks, with guidance on preserving their quality. The chapter highlighted the necessity of consulting manufacturer’s instructions and adhering to workplace procedures to optimize the use and maintenance of both equipment and materials. Relevant environmental legislation was discussed to ensure compliance with regulations that protect the workplace and surrounding environment. Additionally, the correct use of Personal Protective Equipment was outlined to safeguard users from potential hazards during drawing tasks. Together, these elements promote efficient, safe, and environmentally responsible technical drawing practices.