Nick Hulme
Well-Known Member
- Joined
- Oct 6, 2008
- Messages
- 338
- Reaction score
- 84
This is an old one so I expect most of you know it already.
You have a part and you want a hole that goes in here -
And comes out here -
So you centre both points
Then you get you one of these -
And put it here -
Drill both ways up, each time with the bottom hole on the centre, the target here is a 7mm hole so I started with 5mm from each end -
Then drill freehand through from each end with the next size up, 6mm here,
And finally finished size from each end and you're golden -
Demo is wood but I've used it on Aluminium and steel parts, sometimes you need a custom centre tip,
- Nick
You have a part and you want a hole that goes in here -
And comes out here -
So you centre both points
Then you get you one of these -
And put it here -
Drill both ways up, each time with the bottom hole on the centre, the target here is a 7mm hole so I started with 5mm from each end -
Then drill freehand through from each end with the next size up, 6mm here,
And finally finished size from each end and you're golden -
Demo is wood but I've used it on Aluminium and steel parts, sometimes you need a custom centre tip,
- Nick
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