View Full Version : Laser center finder, anyone here make/use one?

09-07-2014, 08:20 PM
Saw it here:


curious... and thinking of something like this to run it:


cheap enough, ought to be low power enough to be safe?

Forrest Addy
09-07-2014, 08:45 PM
Great idea: The chuck is independent of the centering device. You can vary the convergence distance at will, cheap and simple to build, you can run the quill up and down to converge on a spot or a hole rim - maybe center a disk by lasing the OD's edge.

First link:

Probably OK for rough work. You could leave it in place full time.

No good for less than 0.010" C/L location. It would be like signing a check with a 4" brush.

Second link:

Seems like you have to run the spindle a couple hundred RPM to make visible circles; Thus you need battery power or a slip ring. Otherwise the cord would spool up on the spindle. Why not a laser lecture pointer? Mount it in an angled bracket made from an Indicol clamp?

Old Hat
09-07-2014, 09:04 PM
I'm still finding guys that won't use a Coaxial, let Luke Skywalker keep the lasers.
W T F cars that help you park them. etc. etc. etc.

Bet the chimps are laFFing at us.

09-07-2014, 09:34 PM
Pretty sure I'll make one to feed the curiosity at least...

-Forest, he said good for 50 microns, so 0.002 inch sounds pretty reasonable on a drill press. Figured the laser would go in one hole, then @ 180* mount the battery.

-Old Hat- whatsa Coaxial?... :)

Old Hat
09-07-2014, 09:42 PM
http://www.google.com/aclk?sa=l&ai=CKUapigkNVKubOYnnyQHGsYH4DuLR_JEHgorQmpoBuMH1wZ oBCAQQASgFUN_LtoH6_____wFgycbbjfykqBOgAaacxNUDyAEH qgQnT9BhM6G8wCM62wo9YSX2a79MGJ_dpBcHbnB0RpVEZPdT7G ZAoTdbwAUFoAYmgAfC47sqkAcBqAemvhvgEuiY88LalsG0UQ&sig=AOD64_2OtUmRsr3OFNr8ftSGGkJ3CI83KA&ctype=5&rct=j&frm=1&q=&ved=0CCAQwg8&adurl=http://cnc-specialty-store.com/maintenance-tools/co-ax-indicator-coaxial-indicator%3Fcurrency%3DUSD


Coaxial indicator dial remains stationary while the machine spindle rotates. Exact chucking not needed. Operates at any angle from horizontal to vertical without any change, and from internal to external by simply changing the feeler. With so much Coaxial indicator travel either way you can dial a hole or diameter in a matter of seconds.

09-07-2014, 09:46 PM
Ahh, can you tell I've never even run a milling machine, much less own one... yet...

Old Hat
09-07-2014, 09:51 PM
Ahh, can you tell I've never even run a milling machine, much less own one... yet...

Jeese, ya didn't have ta log out!:D

09-07-2014, 10:20 PM
I saw the video some time ago so I made a crude copy to try it out. Used a laser pointer from the Dollar store and junk from my scrap box: http://www.gadgetbuilder.com/LaserCenterFinder.html

The dot from my cheapo finder isn't bright enough to see with my task light on but with just shop lights it shows up nicely. The dot is about 1/8" wide, which works OK since you're judging tilt to the circle, not position of the dot. I was able to repeat within about 3 thou so it will work for some things but I'm keeping my old Starrett edge finder in case I need to be closer than that.


09-07-2014, 10:51 PM
I guess the lazer would have to be set at an angel towards the center for it to work?

09-08-2014, 03:46 AM
I made two of these gadgets, see:

09-08-2014, 11:09 AM
I like the idea. It's basically an optical wiggler, and I use a wiggler when I don't have room for a coaxial.

I may make one for my micromill. It does not have a lot of height.