Optical Centre Punch - #TMC2020

**MachineNZ** · Jul 20, 2020, 11:04 PM

Hi Everyone,
This is my entry for the #TMC2020 :

For those of you that don't know Emma Ritzen (Youtube Channel: Emmas Spareroom Machine Shop) is running a tool making competition on Youtube.
Type #TMC2020 into Youtube to watch videos from creators who have entered.

Regards
Kevin Campkin

**th62** · Jul 21, 2020, 12:29 AM

Interesting! I made one some time ago but couldn't get a convex shate good enough to magnify clearly so I just polished the end flat and scribed crosses top and bottom. To get the cross hairs as fine as possible i used a sharpened hacksaw blade. I also lit mine with an LED.

**MachineNZ** · Jul 21, 2020, 12:39 AM

Originally Posted by th62

Interesting! I made one some time ago but couldn't get a convex shate good enough to magnify clearly so I just polished the end flat and scribed crosses top and bottom. To get the cross hairs as fine as possible i used a sharpened hacksaw blade. I also lit mine with an LED.

Hi there, yes the lens has to be a particular shape thats why I researched online using one of the many Lens calculators.
Yours looks cool with the LED