23-10-2012, 06:03 AM
Claudio,
The best way to get it concentric is to drill it wiht a drill press. If you try and do it with a pistol drill you won't get it square and if it's not dead square it will never be concentric.
I have a nice drill press at work I'm more than happy to drill out a few props for you. I've done heaps of them, Like I said before the trick is to sharpen the drill so it doesn't grab.
You could use a step drill as wayne suggested I think these are made so they don't grab, they are often used for opening up holes in sheet metal. You'd have to by one tho' and make sure it has a step the right size.
The best way to get it concentric is to drill it wiht a drill press. If you try and do it with a pistol drill you won't get it square and if it's not dead square it will never be concentric.
I have a nice drill press at work I'm more than happy to drill out a few props for you. I've done heaps of them, Like I said before the trick is to sharpen the drill so it doesn't grab.
You could use a step drill as wayne suggested I think these are made so they don't grab, they are often used for opening up holes in sheet metal. You'd have to by one tho' and make sure it has a step the right size.
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