Monday, November 17, 2008


Relate to brief and specifications

This was my brief:
My client is Doctor Tony House. He needs a garden light to light up some poacita in his Coromandel home. I have made myself the stakeholder. The light must be self-powered and be able to charge all day and then automatically turn on at night. Because it is in the Coromandel it needs to be rustproof so materials such as stainless steel, plastic, aluminium, brass and copper might be good. The light must also be weatherproof / waterproof. The cost must not exceed $30 and the light can be no taller than 500mm.

My light is self-powered because it has solar panels to charge its rechargeable batteries. It is able to charge all day, with the solar panels, and it switches on at night because it has an LDR (light dependant transistor) which can tell if it is dark or light.

I have used only rustproof materials – plastic and aluminium – so that it will not suffer salt damage in the Coromandel. It is also very heavy because of how big it is and all the rivets in it. It will not be blown over by wind. But it is not weatherproof. Because of the pieces not fitting together and having to use self-taping screws there are large gaps in the shell of the lantern. If I had used a wood mould for vacuum forming I probably wouldn’t have this problem. But as it is the light does not meet this specification.

It also does not meet the 500mm height specification. Because of the vacuum forming machine not fully sealing the moulds in the bottom bulb I had to cut off a lot of the edge on the Gerbel to make it even all the way around. Because of this the two pieces do not sit perfectly together so that I had to add a lot of strips around it to bridge the gap between them. This added considerably to the height and took it over the 500mm limit. The light does not meet this specification either.

My budget was $30. I spent $4 on the circuit board, $10 on LED’s, $1.50 on batteries, $0.50 on heat shrink, $2 on aluminium, $1.50 on the solar panels, $5 on the rivets, $0.50 on wood, $2 on Styrofoam, $1 on screws and $3 on acrylic. I would have been just over budget, $31, but I had to spend almost double this on vacuum form plastic, taking me way over budget. I couldn’t stick with my original design or build the light I wanted if I didn’t have this plastic.


EVALUATION of final product

We started off this project with a field trip. We went to the Corillion, Waitangi Park and Civic Square to look at lights that blend into their surroundings. I wasn’t very inspired by this but I learnt something about the technical side of camouflage. The thing that did inspire my design was some Henry Moore sculptures that I found when I was researching ideas for my light and neon coloured lights. One thing that remained throughout the process was the coloured light.

The first few ideas I sketched with these inspirations in mind were kind of boxy and square, which looking back would have been a lot easier to build. But the design I settled on was four spheres on top of each other with a spike on the bottom to make sure it wouldn’t blow away. It was going to have a different coloured light in each bulb (reflecting my love for the neon design) and be clouded plastic. It was to shine all sorts of colours on the poacita. I had no idea in the beginning how I would create it, just that I liked the design.
We researched non-corroding materials and poacita grass. I liked the brass, copper and aluminium but I thought that if I used these metals I’d use all metal or none at all, as I didn’t like the plastic and metals together. So, considering my design, I went with none at all. Having decided that, I had to research plastics as well.

When I drew my design on Freehand I decided that I would have three bulbs, rather than four, to make it easier for myself and to make sure it wasn’t too tall for the brief. I drew up the design on Solidworks. After doing this and talking to Terry about it I realised that I had nowhere for my circuit to go, so I added a base at the bottom. This was going to be made out of white plastic so that the circuit couldn’t be seen. I then started my mock-up. I used corrugated cardboard for the bulbs and flexible cardboard for the discs between them.

Finally I started my design. The first change I made was to swap the coloured lights for coloured discs. The discs were to be made out of coloured acrylic, in pink, blue and yellow. This was my first job – to cut out the five discs on the CAM2 machine. The first mistake I made was to drill out the holes for the rivets and screws straight away, without having even created the pieces that were to attach to them. These caused many problems later; I had to make a new disc on the CAM2 machine and often drill out new holes. This means I have useless holes in the design that just added to its non-waterproof state. This is definitely something I would be very careful of if I did it again.

I then got to the stage where I had to make brackets. I was offered the opportunity to use Polymorph to create these. This was good as it fit with my No Aluminium rule. I designed jewel shaped brackets. Eventually we abandoned the Polymorph because, even after rolling out with a rolling pin, it was still lumpy and we would have cut them out on the CAM2 machine anyway. So I decided to use coloured acrylic and cut them out. These first caused problems because the CAM2 wouldn’t go over the engraved part, so we had to do them in two goes. The second problem they created was when I tried to drill them out they snapped. I broke three this way, and had to make more. So if I did this again I would stay away from the Polymorph and be very careful with my brackets.

To make the moulds for my vacuum forming I used two different materials – wood and Styrofoam.
Where the wood was smooth and even the Styrofoam was lumpy and irregular. Also the wood lave was much quicker to use than filing down the Styrofoam by hand. I lot of time (including after school) was spent filing these. I did have a slight problem with the wood lave in that I didn’t know for sure which tool to use and so ended up making a few scratches in it. But that was quite easy to fix. I would definitely use wood for all my moulds if I had a repeat.

Next I had to use all my moulds. Quite a few pieces of vacuum forming plastic were wasted because I cut them too big or too small. Eventually I got it right and moulded half of my Styrofoam moulds at a time. The plastic on the biggest bulb halves didn’t quite reach the bottom so in order to have relatively smooth sides I had to gerbil quite a lot off the edges of both. Which was a problem when I came to put it all together. When cleaning these I came across a way to have them frosted, like my original plan. When using thinner and a paper towel to clean off the excess polystyrene the paper left a residue on the plastic that made it look clouded.

After all the vacuum-formed pieces were ready I started assembling the shell. I made vacuum forming plastic (VFP, I’ll call it) strips to attach the bulbs to each other and riveted them on to their respective bulb halves. Then I started to form the base and this is where I encountered my biggest problem. Because I had had to take off so much of the two halves of the bottom bulb they no longer fit together exactly. There was a large gap. In order to fit the parts together I had to fit strip after strip in side each other, until I had four strips in total and the base was a lot larger than I planned. This meant that the design became much bigger than the specifications stated it could be and it took a very long time. I couldn’t frost the strips so later when I put the wires in they were much more visible than I’d planned. Also because I used Polystyrene for the bottom bulb the piece was uneven and didn’t fit correctly, even after four strips, so we had to use self-taping screws. Using the screws was a good idea, and it saved me time, but it meant that the design was very far from waterproof, as it was meant to be. If I hadn’t had this huge gap I would have spent time fixing the other small gaps, but with this it just seemed pointless.

Next thing I had to do was to start assembling the base, so I needed my brackets to be ready. I had to bend the edges so I used the Thermoplastic Heat Bender. To take them out, put in the vice and bend them before they cooled down was too much for me so I needed help. A few were snapped/squashed during this but I had expected this and made quite a few more, so I had extras. Next I started to try to rivet them onto the base but the rivet gun would not fit and quite a few more were snapped this way. Eventually I decided that they just would not work. Even if they did, they would leave another large gap. So I decided to make aluminium brackets and stick the jewels – minus their flap bits – on top. The aluminium brackets weren’t hard. I measured, cut and bent them quickly. When it came time to attach them I found I could move them, rivet them, and then bend and twist them back into shape. This was something I couldn’t do with the plastic brackets. Then I attached the plastic brackets on the outside, along with a strip of white acrylic, and not even one cracked as I thought they might. In hindsight I would have done the aluminium brackets in the first place and saved myself a lot of time. Now the base was almost done.

Because of time constraints I needed help with making my circuits. Once these were done I had to put them into my circuit. I thought it would be very fiddly to put these through the holes that were made for them. The only small problems were that one more hole needed to be drilled and the wires needed to be extended. Neither took long. I would probably take more exact measurements of the wires if I did it again. Once these were in the only things left were to rivet up the pieces, which went smoothly, glue down the solar panels, also fine, and attach the base. The base was easy enough except that the holes didn’t match up on the bottom disc and the brackets. As I said in the beginning this was often a problem and we just drilled new holes.

I am really happy with my final product, even if it didn’t meet the specifications and barely met the time limit. Though many, many things went wrong it still looks good in the end so I’m pleased. If I did it again I’d definitely take more care to meet the specifications. Now I know to stay away from the Polymorph, not be too hasty when deciding where to drill out my holes, and be very careful when drilling through small pieces. I also won’t let what I really want to build get in the way of meeting the brief. But even though I didn’t meet the specifications or the brief I did stay true to my original design and I was encouraged to do this by my teacher. Despite all this I still love my lantern.



Ban Saw
CAM machine x2 with a 2mm milling bit
Rivet Gun
Metal Bender
Soldering Iron
Solder Sucker
Drill Press Hand Drill
3.3mm Drill piece
5mm Drill piece
2.5mm Drill piece
Corrugated Cardboard
Masking Tape
Double Sided Tape
Wood lave
Belt Sander
Thermoplastics Heat Bender
Hot Glue Gun
Vacuum Forming Machine
Screw Driver
Centre Punch


Circuit Board
Coloured LED
Transistor Oscillator
Heat Shrink

Vacuum Form plastic
( 6 x 35mm x 35mm
4 x 600mm x 40mm
500mm x 40mm
300mm x 40mm
600mm x 120mm )
Solar Panels
3mm Acrylic Plastic (in pink, white, yellow and blue)
( 100mm x 100mm
125mm x 125mm
150mm x 150mm
2 x 200mm x 200mm
600mm x 40mm )
PVA glue
2.5mm self-tapping screws

Monday, November 10, 2008

Finished lantern, in the dark!

Finished lantern!!


(nearly all about waterproof-ness)
Use all wood NOT styrofoam.
Carefully measure holes BEFORE drilling out.

Week 5 Term 4


Week 4 Term 4

This week I came in everyday before school and most days after school. And Saturday and Sunday. I have almost finished everything. I came across countless problems but you can see them in my evaluation.

Light finished EXCEPT for solar panels and bottom circle

Base with middle attached and circuits (and wires with heat shrink)

Inside of base with all circuits on

Top of lantern with bases for solar panels glued on

Inside of first bulb with all circuits

Top of light with bases for solar panels

Bottom of light with first circuit stuck in

Base of lantern with aluminium brackets and jewels

Brackets with edge bits cut off

Three working circuits

Brackets, bent

Middle section, with main wire hole drillled

Top of lantern, with main hole driled


Tuesday, November 4, 2008

New brackets (to replace broken ones)

Very top of lantern with vacumn strip riveted

Half of bulbs with vacumn form strip riveted

What my design will look like when finished

Bulb halves with pink disc riveted in between

Bulb halves riveted with blue disc in between

Jewel brackets, bent

Broken brackets

Jewel brackets on the heating machime with the base they will rivet into

Base with joiner made of vacumn form

Bottom of base bulb with strips riveted

Base of middle bulb with vacumn form material strips

Vacumn form material strips to join halves of bulbs

Vacumn formed mould taken off wood

Wood mould vacumn formed

Video Interview

Thursday, October 30, 2008

Week 3 Term 4

On Tuesday this week I dug out the Styrofoam from my vacumn mould and moulded the second half of the bulb. On Wednesday I was sick but I came in after school and cut off the excess on my vacumn mould. I then trimmed it on a gerbil. Then I cleaned it. I managed to get a frosted look by cleaning it with thinner and a paper towel. I will do this for all the rest of the bulbs too now. I will also be 'sewing' the half bulbs together with more vacumn form material. On Friday I came in in the morning and posted photos and blog and calendar. In the rest of the day I will have practical. I will need to dig out the Styrofoam from my second mould and clean and trim it. I will then finish filing down my largest polystyrene bulb and vacumn form it, in two halves and clean and trim these. I will need to finish off my second half of the wood bulb as well, and vacumn form both halves (plus cleaning and trimming). And at some point I will have a video interview. And I'm coming in on Saturday..

Styrofoam bulb before filing

Vacumn formed half of bulb

Bulb just after vacumn forming

Parents comments

Mum: I really like the design and think the blog looks great. Can't wait to see the finished product. It looks like you've done a lot of hard work, and it's all very detailed. Well done!

Dad: Well I've had a look over the blog and there's heaps to it, isn't there. It really does look like a mini-engineering project with the software design, the circuit board, the cutting out of the metal box and the detailed blog notes. A million miles from what I had available at school as a subject when I went to college. It all looks very impressive and beyond me already! Keep it up - this looks like really practical stuff.

Tuesday, October 21, 2008

Interview Questions

-What have you enjoyed about DTM?
-What have you not enjoyed?
-Have you enjoyed the blogging over writing? Why?
-How do you think you have achieved this year?
-Do you like your final design?
-How different is your final design from what you imagined?

Week 2 Term 4

On Tuesday I cut out polystyrene circles to make a mould for the vacumn forming machine. I cut them out on the band saw, no problems. I then cut the top off to make it the right height and glued them together. They were left to set. On Wednesday we did blog and calendar. I posted two photos. I also worked on my checklist a little more and wrote down the questions for the video evaluation interview. On Friday I had more practical. I did my first vacumn forming on a half of my styrofoam bulb because the whole was too big to fit. A few pieces of vacumn forming material were wasted. I also cut out and stuck together more styrofoam circles for the bottom bulb.

Week 1 Term 4

On Tuesday this week I did blog and calendar. We were given the final checklist to work on and I could tick off most of the components. I have to finish off the rest. On Wednesday we had practical. I took my wood out of its clamps and Terry cut them out for me. I also drilled out holes in the top of my jewel brckets. I had a problem in that I broke three of them. I cut more on Friday but this was really annoying. On Friday I sanded my wood circles in the woodwork room. I also learnt abotu the wood lave which I will have to use next week.

Circle made into half a bulb on the wood lave

Circles cut and sanded, ready for the wood lave

Monday, October 13, 2008

HOLIDAYS 27 Sept-12 Oct

In the holidays I didn't really do anything technology related, except think about what I have to do when I get back to school, because I was away most of the time. I know that I don't have much time left and I have to work mega hard until the end of term. Next thing I have to do is working on cutting out the wood for my mould, for the vacumn form machine.

Squares cut out

Squares drawn on the wood before cutting out

Tuesday, September 23, 2008

Week 10 Term 3

On Tuesday this week Terry wasn't there so we had a reliever. The activity Terry left us to do was origami. So we made paper boxes and boats for an hour. On Wednesday we had half a period of blogging and calendaring. The other half of the period we had practical and I was cutting out squares of wood to shape into spheres on the wood lave, to be a mould to use on the vacumn forming machine. I cut them out on the band saw in the wood work room. The first 6 I did were 350mm by 350mm, and the second lot were..

All jewel brackets finished

Tuesday, September 16, 2008

Week 9 Term 3

On Tuesday this week we had practical. I cut out two more of my jewel design brackets on the CAM machine, and filed the ones I'd cut out in week 7. I also took photos. On Wednesday I did my blog and calendar. I also added photos, changed labels and worked on my check list. On Friday I finished the last of my brackets and filed them all to perfection. On the last set of brackets the CAM machine went all the way around so I didn't have to set up the machine twice. In don't know why that happened. Next week I can start constructing the base.

Week 8 Term 3

this week was exam week so we had no classes.

Pink brackets cut out

Green brackets being cut out

Tuesday, September 2, 2008

Week 7 Term 3

On Tuesday this week I started my Poly morph sheet, I had to boil up the jug 3 times to get the water hot and keep it hot. We then put the Poly morph balls into the water. Straight away they started going clear and lumping together. I was able to roll it out soon, but some bits were still too hard and went even harder once it was out of the water. I put it back in but the water wasn't hot enough. I need to finish it on Friday because I didn't have time to boil water up again on Tuesday. On Wednesday I did blog and calendar. I also re-coloured my blog. Terry checked my blog and gave me six credits. On Friday we did practical. I started to finish off the Polymorph but came to the decision that it wasn't going to work because there were too many bubbles and lumps in the surface of it. It wouldn't cut right or look nice and acrylic would do the job just as well. So I decided to use acrylic. First I drew up the jewel design on 2D design, then cut out the first two brackets in pink acrylic, on the CAM machine. A problem I encounted was that the CAM machine cut out the outline perfectly but ignored the shallow inner line. I don't know what to do about this so I just got rid of the outline and got the CAM machine to go around again and cut out the inner lines. I had to do this for both sets of two brackets.

Thursday, August 28, 2008

Jewel bracket design

Week 6 Term 3

On Tuesday this week we were in the computer labs. We had our final checklist given to us and we were working on finishing it. I just changed some labels and updated a few blogs. I also added some photos. On Wednesday I was sick. On Friday Terry gave us the Poly morph. It is plastic that melts in hot water and can be moulded. I will use it to make brackets to stick the base together, so I don't have to use aluminium, which doesn't fit with my design. On Friday I designed the brackets. The design (see the photo) is a jewel. It will fit over the base. There are eight of them to make. I decided that I would roll the Poly morph into a sheet and cut out the eight jewels on the CAM machine. I will then bend the end flaps over by adding hot water.

Tuesday, August 19, 2008

Base on Solidworks

Two base discs with holes drilled

All discs cut out

Week 5 Term 3

On Tuesday this week I first quickly changed some labels on my blog. Then I consulted with Terry and started on my next step; to drill holes in the two white bottom discs. I had to mark eight holes evenly around the circle, 10mm in. I figured out a good plan for doing this (see above drawing. I drew in the red lines and then just measured 10mm in on each line) I then drilled out the holes. On one discs I used a 3mm bit and on the other a 2.5mm. Next step is to drill holes on other discs. On Wednesday I blogged and did by calendar and posted pictures.

Tuesday, August 12, 2008