You can use this with the Masso controller’s “Dry Run” mode to perform a non-cutting test of your toolpath, helping verify that your machined part will fit correctly on your stock.
The mount holds a 12 mm diameter laser pointer and includes two 3 mm diameter locking holes to secure it in place. These holes are sized to allow self-tapping with a 3 mm machine screw, at least when printed on my 3D printer, and only require minimal torque to keep the laser from moving. I also found that only one screw was needed to secure the laser.
Here is the link to the 3D model and FreeCAD drawing files. Note that I used the name “Dominator” for this project since I already have another version made for my previous CNC machine, but this is designed for the PwnCNC Spindle Mount itself:
Does it move any depending on the Z height? Thats what i was afraid of when I made my Dry run laser.
In my case, mine go into and out of focus moving up and down so going with a stable position is better for me.
Good question. The laser I used has a knurled, threaded front lens that acts as the focus ring. You turn it a small amount to move the lens stack and tighten the spot. I cannot rotate it too far because the front cell will come off, spring behind it and all, but there is more than enough travel to get a crisp dot on my CNC.
On the Masso side, Dry Run lifts the tool to a fixed height above the work and then simulates the path at that offset. Z motion is followed relative to that height rather than plunging into the part, so once you focus at the dry-run height the focus stays consistent during the preview.
If your laser does not have a focus ring or needs the nose closer or farther from the work, give me the measurement from your mount face to the desired standoff. I will be happy to update the FreeCAD model so the holder extends down or up to hit your focus point.
Also, as for powering the laser, I know it is possible to switch it from the Masso via a relay, but for my use I kept it simple: I ran a USB extension through the drag chain and powered the module from a portable power bank. That setup ran for more than two months without a recharge before I tore things down to build the Dominator.
That isn’t my experience. It keeps the current z position. I linked in my post the crosshair laser I use, but thats not usb powered either and as you mentioned requires a separate power supply, and a relay.
