I got a set of Luke’s new eccentric nuts, and thought I would post a note about them.
- They are a direct replacement for the eccentrics in the shapeoko 3.
- They require a 9mm wrench to adjust, instead of a 8mm wrench like the originals.
- They go all the way through the plate, instead of just a little bit like the originals. This should make them much more secure.
- They are nicely made, and marked with a machined dot on the “Wide” side. This is handy in those spots where you can’t see them end on and are trying to adjust.
- They’re pretty inexpensive (about $13 US), and took about a week to arrive at my location from the UK.
Installing them is pretty easy, remove the wheels with eccentrics, push the eccentric out of the hole if it doesn’t come out by itself. Put the wheel/shim back in place, and thread the screw into the eccentric. Line the eccentric up with the hole in the plate and which holding the eccentric with a wrench, tighten the screw. If you’re careful, you can do all this with the carriage plate still on the machine. Do be careful not to lose the shim, it’s necessary for the spacing to all be proper and not bind.
Then, go through the normal process of adjusting the eccentrics.
Coupled with a tougher wheel, you should be able to put considerably more clamping force between the wheels, and that should stiffen up the axis somewhat.
After running a couple small jobs, and tramming the system back up after the installation, it appears that these are holding position better. They are certainly much more robust than the originals. For the cost, they’re a worthy upgrade for me.