SAS

F06

 

BAE 417

Design of Machine Systems

 

Laboratory No. 2

Functional Analysis of a DEWALT Model DC759KA Cordless Drill/Driver

 

Introduction

 

    The DEWALT Model DC759KA Cordless Drill/Driver is designed to meet a number of performance requirements to be competitive in the marketplace.  Performance in this case is characterized by the ability to of this machine to drill holes in a variety of materials with drill bit up to 0.5 inches in diameter, or to install or remove threaded fasteners.  Some important performance parameters may include the overall torque capacity (N.m) and speed (rpm) capacity of the cordless drill/driver and the ability of the battery pack to store sufficient energy (A.h) to sustain operation of the cordless drill/driver for an acceptable period of time.  Operator comfort and ease of operation are also important features.  Obviously, the nature and variety of materials to be drilled may limit the utility of this device.  This laboratory investigation is intended to guide students through a performance testing program to evaluate several of the performance factors of the DEWALT Model DC759KA Cordless Drill/Driver.  Resources available to the student will include various reference materials as supplied in class.

 

Requirements

 

    For this laboratory exercise you will be required to develop a test regiment to address the following performance factors regarding the DEWALT Model DC759KA Cordless Drill/Driver, and how it compares with a cord-type drill (DEWALT Model DW505).  Your test regiment must include a statistical comparison of performance data between models.  Your lab report for this investigation will be limited to the submission of the performance data and statistical analyses along with conclusions regarding overall product performance.  Your test regiment is due next week at the beginning of lab.  Be certain to include a step be step set of procedures for your test regiment along with the number of repetitions required for a statistical comparison.  Also, include all of the parameters to be measured in the comparison procedures.

 

  1. What is the stall torque of the drills/drivers?
  2. Is there sufficient cooling provide for the AC or DC electric motors?
  3. What is the power consumption of the drills for the various tasks?
  4. Characterize the rates at which various tasks can be performed by either drill.  Are there any differences?
  5. What is the useful battery life for performing various tasks (drill holes, driving screws, etc.)?