I'm getting quite excited about what I see is being done and what is possible with the OpenBuilds C-beam system. I am an Electronics teacher at a local college, and we have the facility to produce small numbers of photo etched printed circuit boards, which students do as part of their courses. These have to be hand drilled, which for a small board of 20-50 holes (typical student work) doesn't take them that long. However, my designs for various things usually end up around 1000+ holes per board, and often 3 or 4 boards in a project of mine (I don't do small projects...). This takes some considerable time to drill, and some minor mistakes are inevitable. Due to our manufacturing process, the cut sizes of the boards can be up to 3mm variance, so automatic board drilling based simply off designed co-ordinates won't work. My idea: An XYZ CNC drilling machine, with a camera. Take a hi-res picture of the board in situ, find the holes and drill them. Several years ago I wrote a program that processed an image of a stock price graph and converted it back into a time indexed table of prices. Identifying a hole profile should be easy in comparison. Whilst I understand something about mechanics, I am NOT a mechanical engineer, so anything mechanical that I want to build has to be straightforward, not require me to drill accurate holes manually, and bolt / screw together easily. Openbuilds looks like it will allow me to do just that. I would like to be able to drill boards up to A2 size, which is 420mm x 300mm. I looked at the C-beam video on youtube, and decided that I didn't want a table like that machine has, I wanted something like a light duty OX. So I ordered some sample plates, wheels and a couple of pieces of C-beam to get my head around how things might line up. I was a little concerned with potential twist on the Z axis in the X plane, and thought that if Z were supported top AND bottom this would be very much reduced. This would mean two Y axis beams, which would need supporting a fixed distance apart. This in turn could transmit that twist back to the Y axis supports on the X axis, so the X axis rails would also need to be doubled up. I am useless at mechanical drawings, and whilst I can see it in my head, and have tried to describe it, I'm not sure how clear I am being. V-rail or C-beam could be used to provide the vertical spacing of the Y axes, as well as vertical spacing between the X axes, so no special plates or drilling should be required. I also wanted to have the lead screws not exposed to the work cutting area, therefore the X axes have the flat side of the C-beam facing inwards. Similarly Y axes have the flat side facing the Z axis, and the Z axis flat side facing the tool. This, however, means that the gantry plates are all wrong.... Unless I use the XL plates, which can run on the outside of the C-beam, and use two of them, with the C-beam sandwiched between them. This would also allow for greater bearing surfaces of the increased load of extra beams, and could also run 6 wheels per plate not 4. So net result is: X axis C-beam 1000mm, 4 off Y axis C-beam 500mm, 2 off Z axis C-beam 500mm 1 off plus framing members to hold it all square and rigid. X axis gantry: XL plates, 8 off. 48 wheels (6 wheels per plate) Y axis gantry: XL plates, 4 off. 24 wheels (6 wheels per plate) Z axis gantry: XL plates, 2 off. 12 wheels (6 wheels per plate). With a total of 84 wheels, that is something like £550-£600 just in wheels (using Xtreme wheels for accuracy)... I also then realised - this might actually be stronger than the OX, and with no custom plates. Sorry I can't provide mechanical drawings, I just have no clue how to draw it...I suppose it looks sort of like a cube, but with Y and Z axes moveable. Thoughts anyone? Regards, Slick Conway.