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Adjusting a Traverse

Adjusting a Traverse

In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...

Accuracy and Precision

Accuracy and Precision

Accuracy, limits, and approximation

Accuracy, limits, and approximation

Accuracy, limits, and approximations are common in many fields, especially in engineering calculations. These concepts are imperative for ensuring that a given value is as close as possible to its true value.
Accuracy is defined as the closeness of the measured value to the true or actual value. In engineering mechanics, repeated measurements are taken during theoretical or experimental analyses to ensure that the result is precise and accurate.
The accuracy of any solution is based on the...

Field Procedure for Staking Out Curves

Field Procedure for Staking Out Curves

Staking out curves is an essential process in construction to ensure the accurate alignment of structures along a curved path. This task involves positioning stakes at calculated locations corresponding to the curve's design, effectively translating plans into physical markers in the field. The process begins by determining the geometric parameters of the curve, including the radius, central angle, and tangent distances. These parameters are critical for identifying key points such as the...

Taping Over Different Ground Profiles

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Taping over varying ground profiles requires careful adaptation to achieve accurate measurements. On smooth, level ground with minimal vegetation, the tape can rest directly on the ground. Here, the taping team, typically consisting of a head and a rear tapeman, coordinates their positions with clear communication. The rear tapeman holds the tape at the starting point and guides the head tapeman toward a range pole placed beyond the endpoint, using hand or voice signals to ensure alignment.On...

Design Example: Traverse Angle Computations

Design Example: Traverse Angle Computations

Traverse angle computations are a critical component of surveying, used to compute the internal angles within a closed traverse. A traverse consists of a series of connected lines forming a closed loop, often used for land boundary delineation or mapping. Calculating the internal angles ensures accuracy in the traverse geometry and is essential for checking survey data integrity.The process begins with known azimuths and bearings of the traverse sides. Internal angles at each vertex are...

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Related Experiment Video

Updated: Mar 16, 2026

Adaptable Angled Stereotactic Approach for Versatile Neuroscience Techniques

Adaptable Angled Stereotactic Approach for Versatile Neuroscience Techniques

Published on: May 7, 2020

Can a surgeon drill accurately at a specified angle?

Valentina Brioschi¹, Jodie Cook², Gareth I Arthurs¹

¹Department of Veterinary Medicine , University of Cambridge , Cambridge , UK.

Veterinary Record Open

|August 23, 2016

Summary

Surgeons struggle with accurate drilling angles, especially near 30°, with accuracy improving closer to 90°. Perceived difficulty, not surgeon experience, impacts precision in drilling tasks.

Keywords:

bone drilling drill angle drilling accuracy

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Published on: May 23, 2021

Area of Science:

Orthopaedic surgery
Surgical skills assessment
Biomechanical engineering

Background:

Accurate drilling is crucial for surgical outcomes.
Understanding factors influencing drilling accuracy is essential for improving techniques.

Purpose of the Study:

To evaluate surgeon accuracy in drilling specified angles.
To determine the impact of surgeon experience, task repetition, drill bit size, and perceived difficulty on drilling accuracy.

Main Methods:

Participants (students, veterinarians, surgeons) drilled holes at various angles (30°-90°) using different drill bit sizes.
Perceived difficulty of each angle was recorded.
Hole angles were measured using a digital goniometer.

Main Results:

Drilling accuracy increased significantly as angles approached 90°.
Surgeon experience, task repetition, and drill bit size did not affect mean drilling error.
Increased perceived difficulty correlated with decreased accuracy, particularly at acute angles.

Conclusions:

Surgeon accuracy is limited, especially at angles ≤60°.
Computer-assisted navigation or custom drill guides may be beneficial for critical angle drilling.