Also, just in case someone eventually ever wants to order the same VFD by itself, here is a link, currently priced at $71.56, including free shipping:
https://www.aliexpress.us/item/2255800399757754.html?src=google&gatewayAdapt=glo2usa
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Interesting that the VFD is free shipping, but the spindle with the VFD is $67 USD for shippingâŚ
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Yep. Go figure. I guess the weightier spindle puts the total weight into a different class.
When I subtract the price of the (separate) VFD from the total price of the kit with its shipping, it leaves me at a total outlay for just the spindle at $149 or so.
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I still havenât finished printing the parts 
They kinda work like that.
Fundamentally, a VFD is an AC to DC converter to take the mains input and make it DC, then a DC to AC inverter to take that DC back to the AC in the motor. In order to do the âstep upâ functionality, they just need to step the incoming AC up to an appropriate internal DC voltage. Thatâs a lot cheaper/easier to do when youâre going to be converting it anyway.
This is also why they can be used to run 3-phase motors for things like machine tools off a single phase supply. Itâs basically a single phase AC-DC stage then a 3-phase DC-AC stage. They still need to be sized appropriately and may need a higher input voltage to limit the input current on larger units. 10HP on a single phase 120V would be a bit gnarly.
Edit: Thinking about it, in the past Iâve designed both parts separately but never together, nor have I ever driven a motor with them. Our current setup at work would be equivalent to the output stage of a roughly 250HP VFD with a 230V motor or 500HP with a custom wound high voltage motorâŚ
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Wow, very enlightening! Thank you!
Yes, Itâs worth the money!
I own 2 Katsu, but I didnât use them on CNCs anymore, theyâre good for hand trimming.
Have you been able to run this spindle yet?
They have arrived, but Iâve been too busy (swamped) to get into that yet.
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Have you had a chance to get this running yet? Upgrading my LR2 to LR4 and was thinking of setting up a liquid cooled reversible spindle to go with the Jackpot and maybe even try out the RapidChange ATC.
Get a 65mm spindle, 800w aircooled. You wont need anything more. Trust me
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Sage advice.
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Get a bit setter, with collars for all your bits and many collets and collets nuts as you want. Changes can be made in kess than a minute. There is no need for the automated one (you will save 450-600$
I have not. I bought and then life got hectic and theyâre still sitting there. Still sit in the box.
I have my 800w spindle kit also in the box. The Carbide 3d er11 router is more than enough
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