Group 1 - Black & Decker Drill

Revision as of 19:42, 6 December 2009

Executive Summary

The Black & Decker® DR202 3/8” Variable Speed/Reversible Drill is a must-have tool for almost any project. This six-pound power tool is light enough to be used for the everyday 'do it yourself' tasks while the five-amp motor is powerful enough for professional carpentry and construction jobs.

The main purpose of the DR202 is to drive and remove screws, and drill holes through various materials such as dry wall, steel, soft and hard woods, and plastics. It operates by taking electrical energy supplied by a standard household power outlet which it converts to rotational energy used within the motor. The rotational energy is transferred to mechanical energy, moving the gears within the motor, which supplies the torque to move the bit. It has variable speed: the farther the trigger is depressed, the higher the speed of the drill. The drill can also be locked for continuous use by squeezing the trigger while pushing in on the trigger lock mechanism. Additionally, the drill has a 8’ electrical cord with a two-prong plug. It has a direction reverse switch: push the switch to the right for forward rotation (clockwise rotation), push the switch to the left for reverse rotation (counterclockwise). The drill has a fifteen-position keyless chuck and a convenient bit holder located on top of the drill.

Side view of Black and Decker DR202 Drill	Top view of Black and Decker DR202 Drill	Front view of Black and Decker DR202 Drill

Gate 1: Request For Proposal

The below link navigates to the Gate 1: Request For Proposal page which outlines:

Project Purpose
Group Members' Backgrounds
Proposed Time Management
Group Dynamic Analysis
Pre-Dissection Analysis

Request of Proposal Page

Gate 2: Preliminary Design Review

The below link navigates to the Gate 2: Preliminary Design Review page which outlines:

Gate 2 Purpose
Cause For Corrective Action
Parts List
Product Dissection Plan
Post-Dissection Analysis

Preliminary Design Review Page

Gate 3: Coordination Review

The below link navigates to the Gate 3: Coordination Review page which outlines:

Gate 3 Purpose
Cause For Corrective Action
Component Summary
Design Revisions
Solid Modeled Assembly
Engineering Analysis

Coordination Review Page

Purpose

Gate 4 is the final project review in which the reassembly process is analyzed.

Product Reassembly Plan

The product's reassembly is best approached by reassembling each "Product Reassembly By Steps" table seen below details a step-by-step process for reassembling the drill.

It is recommended that photographs of parts, assemblies, and stages be used as aides during the disassembly process.

Torx #15 screw driver
Flat-head screwdriver
Needle-nose pliers

1 = easy; requiring little effort.
2 = medium; some prior thinking required.
3 = hard; required multiple attempts; two people recommended.

Post-Reassembly Analysis

Below are a few sample questions that address the final condition of the product, disassembly/reassembly differences and further product recommendations:

- Does your product run the same as it did before you disassembled it?

The product runs the same as it did before the disassembly process. We attribute the successful disassembly and reassembly of the process to the detailed notes and photography making it easy to retrace the steps.

- What were the differences between the disassembly/reassembly processes?

The main differences between the disassembly and the reassembly processes were the attention to detail needed. For example, it's easy to remove all of the small washer, the heat sink, and the red washer, but when returning the armature to its original form, the person doing the reassembly needs to know the order and the orientation of the heat sink so that the product will fit in the drill housing properly. similarly, when combining the field and the reverse ring, there are many opprotunities for mistakes: wire placement and the proper orientation of the reverse ring on the field itself.

Taking good notes and paying close attention to each piece prior to removing it is allowed the group to reassemble the entire product.

Different tools used:

Needle-nose pliers

- What additional recommendations would the group make at the product level

The only area of the drill that the group felt could benefit from modification was the field and reverse ring. The first modification that could be made would be to implement a notch into the field and a protrusion on the reverse ring such that the two could only fit together one way. This would prevent the two from being reassemble improperly. The second modification would be to replace the current system of connecting the wires individually into the reverse ring with a single plug in system which would further reassmbly confussion.reduce faughlty reconstruction of the motor assembly

Contact Us

Group 1 E-mail

References

Gate 1:

[1] "Model # DR202 Spec. Sheet." Toolbarn.com. 06 OCT 2009 <http://www.toolbarn.com/blackdecker-dr202.html>
[2] “How Stuff Works: Power Drill.” How Stuff Works. 05 Oct 2009 <http://home.howstuffworks.com/power-drill.htm>

Gate 2:

[1] "DeWalt Service Technical Information" dewaltservicenet.com. 12 OCT 2009 <http://www.dewaltservicenet.com/Products/DocumentViewPDF.aspx?productid=33258&typeId=8795&documentId=21976&AspxAutoDetectCookieSupport=1>

Gate 3:

[1] "DeWalt Service Technical Information" dewaltservicenet.com. 12 OCT 2009 <http://www.dewaltservicenet.com/Products/DocumentViewPDF.aspx?productid=33258&typeId=8795&documentId=21976&AspxAutoDetectCookieSupport=1>