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