Sure, I actually did the alignment holes and tiling myself so I’m happy to share. Take a look at the CAM setups here: http://a360.co/2xSfuQ6.
Not sure how familiar you are with it, but for tiling to work, you need two things:
- A reference location, such as a hole, to locate the piece as you move it through.
- A reference edge, to ensure your workpiece stays square to the machine’s axes as you move it through.
The first thing I do for any of the pieces is drill some holes using a 1/8" bit. One of them serves as the reference location, and the other three let me put in screws to hold down the piece:
Note that the XYZ origin point is in the corner of the first tile above. But for the next tile, I have the origin set to the reference hole:
Prior to putting the workpiece onto the machine, I’ve had the machine drill some 1/8" holes into the waste board along its Y axis, and inserted steel pins. This lets me line up the workpiece to the machine Y-axis and give it that reference edge:
My workspace is constrained in that I can’t actually push the workpiece through — I have to pull it out and flip it around because of the wall in the back. But I want to be able to stick to the same reference edge of the workpiece. To solve this, I have the same setup with steel pins on the right side of the machine:
Then I mount the workpiece flipped around and screw it in. To set the work origin, I just manually jog the machine until the 1/8" bit is lined up with the reference hole:
At this point I run the toolpaths for the second tile. If everything works out, I have a perfectly lined-up and complete piece!
In practice, each tile might be off by half a millimeter or so, but it’s good enough for my purposes. There’s multiple possible sources of error:
- The tool deflection when drilling the original holes. This is hard to control for.
- My error when lining up the bit with the reference hole. This should actually be pretty low, since you can sink the bit all the way into the hole to line it up.
- Error introduced by slipping the X-carriage during tool change. This isn’t good for the machine and is probably the primary source of error, but since my actual carves don’t use a 1/8" bit, not sure what to do about it.
This is one of the pieces that came out the worst:
For the pieces that came out better, you can only tell where the tile division is if you really know to look for it. Honestly, I’m surprised by how well it works: