Harry McMullan
Design brief
In my project I am manufacturing a tipping swarf bin/ dumper for workshop in Bangor
There are many others on the market although I aim to make my bin a lot lighter, more portable although can still carry the same load.
Major customer requirementsManually operated by one person
Lift up to 50kg with 0.2m3 capacity SWL 25kg (safe working load)
fit existing 90l bins
ResearchWhat have you researched and what have you learnt– The height of the skip is 105cm– Have a lot of competition with existing products– The bin needs to be able to withstand wear and tear– Must be able to off load into a British standard skip
Websites for existing products;
– existing product– other ideas– tipping skips
Existing measurements
Current swarf bins
two 57cm in length bins sitting on a 100x60x93(cm) trolley
Also another bin on a 73x 66 trolley
48cm aluminium bins
80L capacity
Density of swarf
Mass of 0.517kg
Volume = 0.00398m3
Density = mass / volume
Density = 129.8995kg/m3
Density of steel = 760kgm3
Therefor if maximum weight is 25kg then the volume is 0.195m3 ie 195 litres
Product Design Specification– the product must last up to 5years with daily use
– if safety regulations change the product must adapt and be easily
changed
– The safe working load will be 25kg
– Maximium load of 50Kg
– Must be able to deal with water/ coolant
– The bin will be weigh between 15-20 kg
– Go up and down kerbs/speedbumps
Detailed designBin height 650mm
Wheel radius (5“) 125mm
Skip height 1050mm
Lifting distance 275mm min
Capacity of 25kg
Low centre of gravity
Tyre Selection
Price of pneumatic tyres on eBay
Solid tyre10” Holds up to 79kgBearings includedCost £21.99
Pneumatics10”Capacity 250kgCost £19.28
Concept1 - barrow
Manoeuvrability
123cm between lathes in the workshop
98cm between front lathes
97cm access
10cm curb outside shutters and also opposite skip
Speed bump between shutters and skip
82cm in width door if shutters fail
width height length
80cm 80cm max
95cm
Initial prototypeI created a prototype to allow me to see the forces in which my scissor lift would encounter when lifting swarf.
Mechanism design
Importance of hole spacing
Buckling is how it would fail
Lift 300mm and 25kg
From model if I lift 25kg with a mechanical advantage of 5 then 50N needs applied
LIFTING FORCE
Force applied
2N 0
2.5N 50g (0.49)
6N 100g (0.981)
7N 150g (1.47)
Max guidance for a worker to be lifting
There is no law on how much a worker can lift although there is set figures of guidance to maintain a high safety standard.
Male – 25 kg
Female - 16kg
Mechanism
Threads on lead screw to lift and recline scissor lift
I used an Acme thread which is used in vices etc which doesn’t allow feedback
Uses high friction as safety feature
Easier to machine than square thread
Used a standard ball race bearing in for the rollers
Solidworks
manufacture
Cutting material Scissor assembled
Welding the frame for trolley
Process I have used;WeldingMillingTurningfitting
Thank you
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