# Day 4 of 2024 release Week! Introducing the Onefinity Spindle Kit by Redline CNC

**URL:** <https://forum.onefinitycnc.com/t/day-4-of-2024-release-week-introducing-the-onefinity-spindle-kit-by-redline-cnc/29461>\
**Category:** Announcements\
**Created:** [November 21, 2024, 4:21pm UTC](https://forum.onefinitycnc.com/t/day-4-of-2024-release-week-introducing-the-onefinity-spindle-kit-by-redline-cnc/29461 "2024-11-21T16:21:46Z")\
**Posts on this page:** 1\
**Showing post:** 42

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**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\
**Post date:** [November 23, 2024, 4:02am UTC](https://forum.onefinitycnc.com/t/day-4-of-2024-release-week-introducing-the-onefinity-spindle-kit-by-redline-cnc/29461/42 "2024-11-23T04:02:21Z")

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Hey Onefinitycnc,

> [@OnefinityCNC](#):
>
> 110v spindles are 1.5kw need 13A peak have a 12 Amp slow blow fuse. 2.2KW are 220V and only need about half that or 7.5 amps peak. Approximate formula is watts/voltage give current.

Then your 2.2 kW / 1.5 kW ratings do not mean the mechanical power delivered at the end of the shaft, like IEC 60034-1 demands. Obviously what you mean with your ratings of “1.5 kW” and “2.2 kW” is the so-called [apparent electric power](https://en.wikipedia.org/wiki/AC_power#Apparent_power).

That means that the mechanical power delivered at the shaft is much lower than with _ **real** _ 1.5 kW or 2.2 kW spindles. What you give is the power that is drawn at the input. IEC 60034-1 requires another power rating: The mechanical power available at the shaft.

[See here](https://forum.onefinitycnc.com/t/anyone-using-huanyang-gt-series-vfd/13083/12) for example calculation. There you see that a spindle that _ **really** _ delivers 2.2 kW mechanical power at its shaft draws more than 3.8–4.5 kVA (and would require a 22 A fuse at 220 V)

In the example linked above, I show that a chinese spindle manufacturer does the same: Offering with power consumption, not power delivery. Like the Makita, where they give the hp that it consumes, not that it delivers, like [explained here](https://forum.onefinitycnc.com/t/looking-for-recommendations-for-a-er20-2-2kw-220v-80mm-starter-spindle/26163/28)

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