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gary wrote:How do you account for the burr on the needle exit point Albert?
Viewmaster wrote:Anyway it's the actual end exit hole shape that counts. Just leave any small burrs alone which are outside the viewing area.
gary wrote:harry dalek wrote:
I have seen tiny drill bits at jaycar and of cause bunnings that might be another ebay thing to get in bulk from china .
hmmm - they have some small drill bits but nothing like .25mm as far as I am aware, but I am happy to be wrong...
sure you should be able to get them online...
gary wrote:Well, technically, the aperture size would ideally be 0.22695625392149 mm
so the smallest there (.3mm) would be 32% oversized - but I suppose you'd still get a picture, albeit somewhat blurred...
gary wrote:The advantage of a needle (or conical cutter) over a drill would be that it effectively countersinks the aperture thus giving you a thinner aperture - which for a camera is always good.
The disadvantage, as I see it, is controlling your "piercing" depth - something Albert appears to have solved.
gary wrote:The problem there Harry, as I see it, is finding the centre of the oversized hole prior to piercing.
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