Jeremy Harris wrote:I'm in desperate need of a nice glass of wine right now, so will put off the final testing with a motor until tomorrow.
Meanwhile, so you don't all think I'm slacking, here are a couple of photos of the finished unit.
oldswamm wrote:Funny how the real world shows up those 'little' details.
Do they make a version of the driver with an inverted high sides?
oldswamm wrote:Since it came up, I thought I'd explain the lazerjet technique in more detail, so anyone who tried it would be more likely to succeed.
A lazerjet works by transferring plastic powder to paper electrostatically.
It then melts the powder into the paper.
To make a transfer, you need a paper that the melted plastic doesn't penatrate well, but still bonds to.
Then you melt it to the pc board with a cloths iron.
When you wash off the paper, you have the carbon/plastic compound left on the board.
Things to watch out for: To much heat/time/force, and things will smear. As someone pointed out, you have to let it cool, so it's well bonded and to avoid the thermal shock. If you can find the controls for the printer, set darkness, or whatever they call it, to max.
Been a long time, hope I haven't forgotten anything, as I intend to use the technique for my own prototypes.
oldswamm wrote:Luck with the changes, Jeremy.
Jeremy Harris wrote:When we first switched to CAD/CAM the guys in our drawing office didn't notice that the (US) software they were using defaulted to inches. They drew up a torpedo tail nut that should have been around 30mm high, maybe 40mm diameter and sent the punched tapes away to the CAM part of the operation, a workshop about 200 miles away. Two weeks later a pallet turned up with a 30inch high lump of perfectly machined stainless steel...................
Jeremy Harris wrote:I'll try and tidy up the circuit diagram and post it later, once I'm reasonably sure that there are no more mods needed.
I've not tried this before, but here's a video shot with my still camera that I've just uploaded to Flickr. With luck you may get to see the controller running..........
Jeremy Harris wrote:I've never had boards made, but if anyone has any advice on sending artwork out and getting boards fabbed up on a small scale I'd find it useful. There seem to be lots of choices, but getting decent service and good value would be the challenge.
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