The laser cross hairs on my old Sears drill press stopped working so I thought I'd try to build a laser centering device I believe was invented by Dan Gelbart. A search for laser centering device should pull up a couple of video's of it in use.

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Seems pretty safe but use at your own risk and of course always wear safety glasses. Also the laser could come on unexpectedly when assembling or just bumping around on the bench or in use so use caution, the laser used is a Class IIIa device. I don't think I would want to spin it over 1000rpm.

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

I've been playing with it for a week or so and I think it's a nice addition to have to my drill press and it was very inexpensive to make. You need parts from a small relay to make the centrifugal switch and a small laser that can be focused. It is powered with 3 LR44 battery's in series.

It is held in place with 5ea 8x3 mm magnets that I've become quite fond of. It fits 3 of my 1/2 inch drill chucks that measure about 1.481 inches. I had to sand the inside of the holder until it slipped on easily but without any slop. The photo's have some notes for clarification and should be self explanatory. 4ea 3mm and 4ea 4mm screws are self tapped into undersize holes.

Hope it's useful to someone.

Cheers

Kisssys

Relay [https://www.amazon.com/gp/product/B00NF0ICSO/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1](https://www.amazon.com/gp/product/B00NF0ICSO/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1)

Laser [https://www.amazon.com/gp/product/B07THR1WGM/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1](https://www.amazon.com/gp/product/B07THR1WGM/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1)

Battery [https://www.amazon.com/gp/product/B07Q16ZPFC/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1](https://www.amazon.com/gp/product/B07Q16ZPFC/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1)

Magnets [https://www.amazon.com/gp/product/B07DD61G2F/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1](https://www.amazon.com/gp/product/B07DD61G2F/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1)

Category: Machine Tools