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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
I did experiment with spin coating other surfaces with photoresist using a spare PSU fan motor.. worked fairly well.
Main issue is that the focus adjustment is incredibly finicky even with a good module. I along with the combined intellects of #hvcomm came up with a fix involving rotating or otherwise moving a suitably shaped large lens so that the laser beam intersects different areas to "fine tune" focus as required.
inspired by the mini lens/motor unit in the PS3 modules. Also it is interesting to note that in theory you can use a motor with preset "beam plate" stencil rotating to one of n preset locations, reducing the time required to "scan" the board by generating existing common pin layouts, then completing the process by "linking point to point".
I stumbled across this method by shining UV LED light through a sheet of Veroboard, and the resulting PCB development had nice sharp edges.
This might also allow a UV LED array to be used instead of the expensive laser.
I love CNC machines myself. After college I plan to get one for any projects... Can you take picks of your CNC machine that has a Zeta plane? I don't think I would want to build one though :P It looks costly :o and mistakes = costlier.
some progress on the cnc. I've made all boards and put them in the box... weeeel you know how at one point the box just gets a bit to smaaaalll WELCOME TO THE JUNGLE hee hee. Connected everything and started testing. Some problems poped but will remove them and hopefully - first movement tomorrow or even tonight.
twist2b wrote ...
I love CNC machines myself. After college I plan to get one for any projects... Can you take picks of your CNC machine that has a Zeta plane?
Hi there - I've posted few pics up the thread. If you are interested in something more specificaly -please write.
no idea about finishing it, because I have exams soon and not much time. But every spare time goes to it. I've finaly got it moving. Here is a video - I am driving it trough the keyboard. Still alot of tuning to be done and test a G-code on it. Also here is a pic how it all looks.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Also if you haven't already, add a safety interlock to prevent laser running when the cover is open (or limit its power to safe levels). Its also possible to increase resolution by adding the zone plate from a PS3 module, and adding a second "prefocus" lens behind the main one.
Just a thought but my version is using the SLA7062M microstepping IC (fairly cheap, and the pcb is simple) ever heard of this IC?
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CNC Pcb etcher -NOW MOVING
WELCOME TO THE JUNGLE hee hee. Connected everything and started testing. Some problems poped but will remove them and hopefully - first movement tomorrow or even tonight.
