My engineering project tipping swarf bin 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 requirements Manually operated by one person Lift up to 50kg with 0.2m3 capacity SWL 25kg (safe working load) fit existing 90l bins

Research What 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 design Bin height 650mm Wheel radius (5“) 125mm Skip height 1050mm Lifting distance 275mm min Capacity of 25kg Low centre of gravity

Tyre Selection Solid tyre 10” Holds up to 79kg Bearings included Cost £21.99 Pneumatics Capacity 250kg Cost £19.28 Price of pneumatic tyres on eBay

Concept1 - barrow

Concept 2 trolley

Concept 3 scissor lift

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 prototype I 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 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; Welding Milling Turning fitting

Questions Thank you