Don’t damage or loose your eccentric nuts. They are not included in the Shapeoko Maintenance Kit for the 3. The kit has larger eccentric nuts that will not fit/function on your carriage. Carbide emailed me today saying they “no longer have any”, a nice way of saying we can’t support this part any longer. Without them you won’t be able to get the proper pre-load on the v-wheels.
And speaking of the maintenance kit for the 3, they include 3 pullies to replace on the Z and X/Y steppers. Unless you have a miniature gear puller for small stepper motors forget replacing them. They are a press fit on mine. "Hey Carbide, what is your plan for the customer to #1 remove, and #2 install soft aluminum pullies that are press fitted? I’ll need to be satisfied with just the new belts and v-wheels.
Scott, can you be more specific on your model? Perhaps the complete model number and date of manufacture? That would help pin down the problem. Thanks.
The specifics of this are:
- the machine originally shipped with the same eccentric nuts as were used on the Shapeoko 1/2
- said eccentric nuts were used on the belt drive Z-axis, which was designed to be as thin as possible so as to reduce lever effects
- the machine switched over to the Z-Plus as a default Z-axis
- the eccentric nuts were replaced with larger ones (which no longer fit in a belt-drive Z-axis)
For removing the pulleys, the intention there was that they allowed a Maintenance Kit to upgrade a machine from 6mm to 9mm belts — if a machine already has 9mm belts, then the pulleys are redundant spares, only to be used if a pulley is somehow damaged — usually they can be levered off with a pry bar and suitable fulcrum.
Hey @metalbender, I have 4 of the original eccentric nuts that came with my Shapeoko 3 (the bottom ones in the pic; the top ones are the newer kind in the maintenance kit). If this is what you need, send me a PM and I’ll mail them to you.
I successfully competed belts and pullies on Z and X, tackle Y today. If I need an eccentric nut I may shout out. In the long run I may order some from Inventables, they are used on the Y plates.
For those that experienced a Z upgrade on their 3, did you notice a difference in performance?
The Z-Plus is markedly more rigid than the original belt-drive Z-axis, and can be pushed harder, esp. in terms of depth per pass.
The HDZ is that and more, and adds the advantage of being narrower, so increases the X-axis travel width, which was a boon when I had a project which otherwise wouldn’t fit on my XL (serial #0006 upgraded from Standard).
I will note that in softer materials, and for 3D finishing passes the belt drive is quicker/more nimble (and when it was first launched, it was stunningly so compared to the M8 threaded rod in the SO1/2 (for those folks who didn’t get Brandon Fischer’s nifty Leadscrew upgrade)).