This wiki page shows a slight increase in the X range when using an HDZ. (+64mm) That makes sense, as the HDZ is kind of narrow. The carriage can slide closer to each end of the X rail. However, this page also shows an increase in the Y range. (+74mm) That doesn’t make sense to me. Just wondering if there’s something I’m not thinking of.
The original belt z is 170±mm wide. The hdz is 130±mm wide. Both z belt and hdz are 13 mm thick but the hdz adds 37mm in the bearing blocks making it about 50mm thick. Perhaps the wiki is wrong. I have Shapeoko 3 with hdz 3.2. Perhaps newer hdz has different measurements. I reused my 69mm router mount so I cannot see how my hdz gets any more y increase over belt z past 37mm. However I see how they get more x. The defaults in cm have in the past compensated for Suckit dust collection which is wider than both belt z and hdz frames. They did that to avoid slamming z carriage into y rails.
I think there’s something wrong with the published values on that link. If you look at the number for the XL without the HDZ and with the HDZ they are the same whereas for the XXL there’s that 74mm increase that you point out. That said I have a Shapeoko Pro and going from the stock Z-Plus to the HDZ represented a 9mm increase if staying with the stock router mount. You could gain a bit more if you also upgrade to the 80mm spindle but not a significant increase. That said I wouldn’t say this in an increase in the Y range but rather simply shifting the same cutting area in the Y direction towards the front of the CNC machines table.
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The numbers for the XXL were derived by reducing the number of steps in Grbl after sending the defaults for an XXL, then moving to the various rapid position points.
They were also done using possibly different versions of Carbide Motion, and it’s quite possible that an error was made in transcribing them.
The HDZ should only increase movement along X and Z for an SO3. Any change in Y is likely attributable to a difference in Carbide Motion, or an error in writing down numbers.
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