How to drill a hole in a tricky-to-align place

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I need to drill a hole with a centre where the edge of another hole is. How could I hold the drill in the right place or otherwise make this hole without the bit slipping towards the other hole?

I need a 25mm hole with its centre at the back of the hole in the middle of the pictured triangle.
 

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Sponsored Links
Centre punch, then small drill first.
It would be better done with a pillar drill, rather than a hand held drill.
 
Last edited:
Sponsored Links
Do you mean the centre of the new hole is literally on the edge of the existing hole, like this...

upload_2021-4-21_23-0-29.png


If so, no amount of clamping will prevent the centre drill trying to wander into the hole and pulling the holesaw off centre. File a groove to allow the centre drill somewhere to go(see below), then use a method already mentioned to guide the new hole on target.

upload_2021-4-21_23-5-52.png


OOI, how come we can't see through the centre hole?
 
if its a one off then consider a half inch drill centre punched in a triangular pattern then nibble and file to shape
but as said a template and holesaw if many need doing
 

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