It’s a great truism of anything connected to a hobby, making anything, fixing anything as much as of life in general, that whatever it is you’re doing the one bit of kit you find you need is the one you don’t have. How many times have you taken a whole bunch of stuff and tools out front to fix the car only to find that the one spanner you need is the one you didn’t bring.
So it was with me realising I needed a lightbox if I was going to stand any chance of transferring sketches to better quality paper for final drawings. I had a couple of sheets of a varirty of good old fashioned carbon copy paper but it wasn’t what I wanted and you can’t see where you’ve been so easily with it. Jumping on-line I realised I’d be in to over £200 for an A3 size. And the boxes on offer were just like I’d used in the past; big, heavy things fabricated out of metal extrusions and packed with great big fluoro tubes that get hot.
I wanted something slim and low in profile, capable of taking an A3 sheet and certainly cheaper than £200 or so. After no more than two minutes thought I decided to make my own. One mad project I’d done a couple of years ago was converting a new office machine into a do-it-all device complete with coffee machine, DVD player, stereo sound, screen etc. It was made to “float” on a bed of light, and for this purpose I’d usesome brilliant low voltage cold cathode light tubes. Very compact, bright and they don’t get hot. I tracked down the company Luxx and ordered some tubes in white and the various bits of power supply and inverters.
So with four tubes in hand I worked out how big I wanted the box to be, essentially A3 plus a bit. Again using an old work supplier, and there are lots of people out there who can supply you should you need, I purchased two pieces of Acrylic sheet (Perspex) cut to my dimensions. One is white, for the base of the box so I didn’t have to paint the whole interior and the other opal for the top.
Then off to the local wood store for some strip wood in two widths for the frame. By laminating the strips together I could create frame sides with an integral rebate to take the acrylic sheets and leave me with a flush surface.
I made sure that this rebate was continuous around the top to fully support the top opal sheet. To fix the white base sheet I cut thin strips and four triangles to give me four corner fixing points and some support areas for the base. See pic on the right. I simply took my time, which means taking plenty of time to let glue dry and set, and simply glued the structure together. PVA wood glue is great stuff if you leave it alone to do its thing.
While the frame dried I got busy on the base sheet and lights. The tubes come in square section housings so you can rest them on whichever face you want for the best effect. Luxx usefully supply some very handy velcro tabs for fixing the lamps in position which makes life dead simple. I also measured the positions for some mounting holes for the inverters, the white boxes shown, drilled some holes and put them in place. two tubes can run off each one. Once I’d decided on the light spread I wanted it was merely a case of positioning the Velcro bits and fixing the lamps in place. Some white tape to manage the wiring and it was ready to go.
I’d used two layers of double sided tape to hold the front sheet in place and so everything mounted into the back of the frame using the foiur screw holes in the corner triangles I’d put in at the start. The base sheet slipped in without any fuss and once screwed together I had a great little light box.
And here it is in action. I know full well that the light spread is not continuous across the box, but that’s not an issue. What I have is plenty of light coming through allowing me to trace away to my hearts content. It works through some pretty thick papers so all is well. I use it as shown, propped up on a plastic laptop support from our good friends at IKEA which makes a very comfortable working angle. I’m very pleased with it.
What you can see lurking on it in the pic is a loose sketch for a chopper/bobber/ low riding composition I’m starting to work up. Watch this space for the final version.
Oh, and by the way, if you do fancy making a similar lightbox the lamps are Deluxx 5 and the code number is TE26290-65UV. They will happily give you advice about inverters and cables if you need it, but it’s all on the website.