MikeR
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| posted on 16/11/10 at 09:31 PM |
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Made a spreadsheet last night and I can almost get there with different thickness tubes but the last tube ends up with walls of .5mm. That
doesn't seem realistic to me, any wander with the drill and i'll be through.
Think i'm quite happy with the idea of drilling 1" steel. Just need to get some drills and steel now and give it a go with the jig
suggestion from 907 (thank you). If that doesn't work i'll hassle my dad to make a jig to place the centre punch.
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scottfraser
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| posted on 16/11/10 at 09:49 PM |
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easy solution to finding a centre:
One pillar drill with drill installed
One large blob of blu-tac, or other plasticine stuff
One pin
One (preferably) metal ruler
Simply blob the plasticine on the outside of the drill bit & insert pin on one side, put object to be drilled in vice
Switch on drill, and use ruler to guide pin to outside of object to be drilled. Once aligned, the drill is now central, drill
simples..... 
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