IMO, the only reason to get anything larger than a properly rated 800 Watt HF spindle for a Shapeoko is to get an inexpensive (Chinese) spindle with a collet larger than ER-11. There are workarounds for that limitation for most. Unlike routers, HF Spindles should be rated on output rather than input power. So, a 800W HF spindle should be the approximate equivalent of a “2 HP” router at rated speed. Jianken seems to be the only Chinese manufacturer that provides (albeit overly optimistic) speed and torque curves for their spindles. Based on input power ratings of the others, it’s likely that the G-Penny ratings are the most realistic of the other Chinese manufacturers - like HY.
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