Spindle Recommendation - Page 3

1. ## Re: Spindle Recommendation

Originally Posted by mactec54
But it requires twice the amps to achieve the same 746watts, on the different voltages, that's elementary level math V(V) = P(W) / I(A) the Amp requirement it what is different, between using 120v and 240v, as for a transformer you always size a transformer to eliminate any loss there might be

This is the difference

120v @ 746w= 6.2 amps

240v @ 746w=3.1 amps
Watts are the same, therefore Hp rating is the same. Wattage is the measure of work performed. Wire size is based on amp draw. All transformers have losses.... look it up. All pretty basic stuff.

https://www.copper.org/environment/s...ns_losses.html

https://www.electricaleasy.com/2014/...fficiency.html

2. ## Re: Spindle Recommendation

Wmgeorge and mactec, thanks for the info provided. Going back to the basics helps understand the limitations of the motors in question.
I was extremely skeptical about adding a 220v outlet to power a spindle but after some digging it seems a very easy process. Risk serious injury involved but I would let my buddy work on the breaker panel and I will do the wiring; he is an electrician. I think this will be the best solution. Which is what I was recommended at first but was not aware how simple the work is, my bad.
Now, I will need to decide if I want a 220v 1.5kw or 2.2kw spindle...back to researching a bit more!

3. ## Re: Spindle Recommendation

Originally Posted by Phil_Par
Wmgeorge and mactec, thanks for the info provided. Going back to the basics helps understand the limitations of the motors in question.
I was extremely skeptical about adding a 220v outlet to power a spindle but after some digging it seems a very easy process. Risk serious injury involved but I would let my buddy work on the breaker panel and I will do the wiring; he is an electrician. I think this will be the best solution. Which is what I was recommended at first but was not aware how simple the work is, my bad.
Now, I will need to decide if I want a 220v 1.5kw or 2.2kw spindle...back to researching a bit more!
Since my shop is wired for 240 volts it was a no-brainer for me. My control panel is a CNCRP 120 volt pre-wired plug and play and it had outputs to control the VFD from Mach3. You want the 2.2 kW spindle. I went with a Hitachi VFD but would not do it again. You do not need all the bells and whistles. Make sure your drive is rated for single phase input and will go up to 400 Hz. Mactec has a lot of experience with the Chinese drives.

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