Virtual Machine Security Guidelines Version 1.0 September 2007
Machine design Creativity Journal 1.0
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Transcript of Machine design Creativity Journal 1.0
Machine DesignCreative Journey
Objective
To design and build a gearbox capable of lifting a minimum of 8kg’s between 0.5m to 1m
Being assessed on the criteria of performance. Making sure that the design is as small as possible as well as efficient and quick.
Brainstorm Of Ideas and Items
Gear Box Options
Planetary Gears Elliptical Gears Compound Gears
Planetary Gears
Pros:• Downgrading of
ratio/speed• Distribution of loads• Efficient
Cons:• Difficult to work with• Lot of stresses within
the system• Frictional losses
Elliptical Gears
Pros:• Applying load when
most necessary• Distribution of loads
Cons:• Difficult to work with• Reduction factors are
hard• Positioning of gears
Compound Gears
Pros:• Easy to work with• Good reductions• Easy to repair• Allows for many
possibilities and designs
Cons:• Not as efficient as Planetary• Stresses not distributed• May take up a lot of room to
get right reduction
Chosen Idea
3 tiered planetary system Planetary gears are very good at conversion of torque and speed Due to the system being compact, there are a lot of stresses that need to be taken into
consideration between the gears 3 or more stages are required to get the correct amount of reduction.
3 carrier planets per tier 3 is the optimal amount of planets, it distributes load across all gears whilst not having to
much stress and does not generate as much friction as a four-gear system does.
Sample Calculations and DesignSun to Carrier:1+R/S
Planet to Ring:1/(1+S/R)
Sun to Ring:-R/S
Therefore it can be seen that by keeping the ring gear fixed and having it as big as possible whilst the sun gear smaller the ratio is much larger.
Thank you for watching
Does anybody have any questions?