Tuesday, 8 June 2010
Product and Project description
VRAY renders
Manufacture 2
A thin layer of carbody filler on the internal spout wall should make it reasonably waterproof once the two sides are glued together.
Sanding - after the majority of the filler has been filed off (to save time and energy), use a reasonably rough grade of sandpaper to take off the excess.
I needed to repeat the filling and sanding process several times to build up a smooth layer.
Start using finer sandpaper, once all the excess filler has been removed. This will start to produce a smoother surface the finer the sandpaper you use.
After several coats of high-build primer, and some very fine sanding using a high grade piece of steel wool, the surface is ready to spray.
Manufacture 1
Using the 1:1 scale drawing to make sure the block of wood is large enough. Need 3 blocks - two halves that make up 1 full model and then another half to show the internal spout.
The right outside - the outside of the model takes much longer to machine because of the amount of material that must be removed. To make sure the model was secure when on the CNC machine, several screws held the model to the white board beneath.
Once the CNC machining was completed, there was a fair bit of work to be done to the surface of the model - filling, sanding and priming.
The discs do not fit into the hole exactly - it would be best to sand the wood to make the hole larger rather than trying to sand the disc to make it smaller.
Using a rounded file will make the hole slightly larger to house the disc.
The small block that was left by the CNC machine to allow a screw to hold the model in place intersects the spout - the inside must be chiselled out to allow water to pass through the spout.
When setting up the CNC machine to complete the outside, it was difficult to allign the second file with the one that had already been completed. This resulted in the spout wall thickness being slightly smaller than intended - I therefore needed to glue the thin spout to prevent any major breakages during the finishing stage.
Rhino 3D modelling
1:1 scale drawing - able to trace round the outline in rhino.
The discs that house the different sized bottles can all slot into the hole in the model. The grooves ensure the disc remains stationary when screwing and unscrewing the bottle.
These discs will be made using the Rapid Prototyping machine - advantages include the relatively low cost for small items, can make an object as many times as you want using a specific rhino file, its ability to make decent threads.
Redesign - sketching 2
The angle of the bottle in this sketch is far too low - the bottle must rest closer to the centre line/point of the object.
Simple curves - sketch 3D to see how the spout will look - does it taper towards the end?
The spout curves upwards really nicely on this design, though remember to keep the water level in the bottle at the same height as the spout - otherwise spillages may occur.
Almost the final shape - The bottle is resting a little too low and will put too much weight on the rear of the object. The spout is also too close to the centre of the object - again, messing with the stability.
Redesign - sketching
Much nicer shape - good, vibrant colours also. The detail of the grip is a consideration - will the final be made from plastic, will it be rotationally moulded (process used for watering cans), and will it have any features such as grip?
A little too much like a watering can - the curves of the spout, handle and holder don't work together.
Much better, spout and handle point in same direction - 'leaning back' look is pleasing.
Developed shape - more curves than the previous form.
More like an attachment - simplified handle. Interesting ridging detail on the side of the base unit - would look great in chrome.
Almost wishbone-shaped, with a slight twist. The object may be slighty top-heavy - making it more likely to topple over (develop the shape to prevent this)
Lip at the back makes a simplified handle - saves doubling up (bottle is already one).