The Shop > Tools
Anybody build Dan Gelbart angled laser centre finder?
BillTodd:
My version :-)
Based on Mike's (of Mikesworkshop) design , I've pared this down to the minimum using a plastic body and automatic centrifugal switch.
Photo 2 - The cap is sized and shaped to clip into the 21mm battery recess
Photo 3 - the cheap 50p eBay laser module has the wires removed and a 40mm piece of tinned copper wire added to the negative (resister) terminal - the module's PCB has to be trimmed (grinder) to make sure the module will press nicely into the 6mm hole
4 & 5 - Once the module is pushed home the wire can be bent around to form the Negative battery connection. A small piece of plastic foam packing is used to push the 3V lithium cell away from the laser body (the +ve connection).
6 - Once the thing is rotating above a couple of hundred rpm , the battery is pushed against the body of the laser module and it lights up.
drmico60:
Bill, Very nice
Mike
BillTodd:
Thanks Mike :-)
This is the simplest one I can think of:
The rod is turned down to weaken it and then bent . It is then pressed into the head using a barbed form on the end of the rod.(previous version was threaded)
If you need a larger circle, it is a simple matter to twist the head slightly.
The small offset weight does not upset my mill/drill.
BillTodd:
Finally; one that works like Dan Gelbarts' and mounts to the ER32 chuck nut. Using an offcut of Nylon 6 bored to be a press fit .
Incidently, adding an iris as mentioned in the posts above (e.g. something with a small hole between the spring and laser diode) improves the functionality immensely.
I used one hole from a piece of Vero board (matrix PCB ) filed to fit into the laser recess.
Arbalist:
Yes, using a small aperture does seem to work well. I turned a small aluminium housing for the laser and drilled a .65 mm hole in the bottom. It's the little silver canister to the left of the laser in this picture.
Still not got round to housing the battery properly as I've had other stuff to do but I have used it as is and it works very well.
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