Optical centre punch

View of the CAD file & assembled materials (brass, medium carbon steel & acrylic)…
knoba - optical centre punch

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All machined to stated dimensions.
knoba - optical centre punch

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Loupes’ internal bore has been reamed.
knoba - optical centre punch

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Polished rings at ends and grained through body for finish & finger grip.
knoba - optical centre punch

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Recess for rubber ‘o-ring’ to stop the loupe slipping out of position.
knoba - optical centre punch

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Centre punch is being soaked (the punch is at the front & the bits at the back are for another project).
knoba - optical centre punch

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Punch is going to be quenched in old engine oil.
knoba - optical centre punch

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View through loupes’ optic.
knoba - optical centre punch

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CAD drawing below is for another project and the reason I wanted to make this tool.
knoba - optical centre punch

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O-ring fitted and held in place with epoxy glue.
knoba - optical centre punch

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Tool needs a case to protect the optic and keep the tool together.
knoba - optical centre punch

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Looking forward to using it for the next project…
knoba - optical centre punch

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knoba - optical centre punch

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Cross-hairs were scored on the lathe and highlighted with a blue sharpie pen.
knoba - optical centre punch

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knoba - optical centre punch

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knoba – Optical Centre Punch – 2015.dxf (link below)
knoba - optical centre punch

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knoba – Optical Centre Punch – 2015.dxf (updated)

With thanks to “PJ’s” at PJ’s – Home

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