1st post so I hope that I'll give enough information to get some good tips/advice! we've a project that we're planning which will involve the drilling/cutting of a LOT of 20mm holes in 75x50x3mm tube. We need to drill/cut the holes very accurately down the centre line of each face of the tube. The holes are evenly spaced along a 2300mm length of tube however the spacing changes in the central section of the length where the holes will be closer together. I've been going around in circles and may well be overthinking the process so am after good ideas to approach this problem please! Ideally we'd like to achieve this with minimum investment in equipment/tooling to start with (we have nothing to speak of) so appreciate that we're really looking for an accurate, manual process where time will be the main cost. As things progress we could look at semi-automating the process using a hydraulic punch but that really isn't an option yet. Any ideas would be brilliant, thanks in advance!