MicroTrac Drive Module Rubric
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The purpose of this document is to describe the features that are desired, or required of the MicroTrac drive module. This Rubric describes requirements for a sub-urban use case. This usecase is based on the imagined living situation and requirements of Andrew Spina.
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User Key:Ben
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FeatureImportance of FeatureDetailed ExplanationVariables and ConstraintsAcceptance Criterion
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Safety
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Limited Pinch Points
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Low risk of tippingThis is an integration requirement for the tool as a whole.Low down weight?I have used one of these and there is a danger of getting the bucket stuck and flinging the whole chassis up, catapulting the operator over the front to the bucket area. More of a hazard then sideways tipping, which shouldn't be a problem.
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Breaking must be reliable
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Part failures shouldn't be dangerousIf a part breaks (like a wheel going flat) the operator or other nearby people should be safe.
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Movement
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Top SpeedFind a good motor max rpm to drive wheel diameter ratioA fast walking speed?4-5 mph?
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Turning RadiusSkid steer = good turning radius.Can spin on a point in thoery. A track drive would rip up the ground when doing this however.
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Multi-TerrainMicroTrac must drive acceptably on the following surfaces: Grass, Dirt, asphalt, concrete, shallow mud.
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Gentle TraversalDriving across and turning on a surface must not harm the surface beyond the specified amount.
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Water resistanceIt may be worth sealing the bottom half from working in mud or water.This could be incorperated in the chassis
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Fabrication
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Few highly skilled operations
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Component based designHigh modularity allows simple maintanence and improvement of constituent modules without complete redesign.
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Favor inexepensive materials
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Integration
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Quick attach to MicroTracThe drive module must attach to MicroTrack (I'm not sure which part) within the specified time.A rear tow hitch with a rear standing platform could be a conflict and a safety issue.
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Modular driveA modular switch between tracks and four rubber pneumatic wheelsGround level drive wheel would be needed for this to be an easy switch. 2wd?I think this should be a option when fabricating, not a switchable feature. To begin with at least.A FWD skid steer loader would not be to bad for front end bucket work. Good weight distribution and should be tested IMO.
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Customisable front attachmentsHighNeed to be able to make dozer, screening, bucket attachments and anything else the owner wants to fabricate for himselfA standard connecting system. Additional ram mount points on arms?I would say stay pretty closely to the dingo/kanga latching system
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Dimensions
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WeightPrefer lighter weight. This effects when MicroTrac will mark surfaces.The lighter it is the less it can counterweight for bucket weight, the less it can grip = the less it can tow/pull/dozeI don't suggest skimping on the structure weight, and see how it performs in prototyping. I was actually thinking of a removable rear counterweight to make excavation more effective.
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WidthMust fit through the average residential gate (apprix 3 foot wide)Power cube is 26 inches wide. This leaves 5-6 inches for each track width and side walls. Doable.
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HeightThe operator should have a clear view over MicroTrac.
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Depth
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Maintanence
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FrequencyLong lasting (and few) disposable parts are preferable.
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ComplexitySimple maintanence is preferred
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UbiquityAll non-permanent parts must be replaceable.
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Cage
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Must contain a Power CubePower Cube is 26x26x26 inches
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Pedestool controls
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Standing platformFor an operator to stand on the rear and be able to see the front attachment clearly.Flatform size to fit a large mans foot. Grippy surface.15x26 inch platform, checkerplate overlay?
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