Here we go again . . . MK4

**routercnc** · 01-09-2022

I’ve looked into lots of options and one of them is to go for a 3kW motor (Chinese wc spindle) via a belt drive onto a DIY cartridge with an ER32 collet. With a ratio of 2:1 I get x4 the torque of my 1.5 kW direct drive spindle and 9,000 rpm. Or 1.5:1 I get x3 the torque and 12,000 rpm. I’ll need to check the max rpm of the bearings I use for the cartridge.
Anyway only planning at this point so my question is can I run the 3kW spindle off a standard UK circuit (13A). The spindle claims it runs up to 10A which is OK on paper but I wanted to check any real world usage, thanks.

**Voicecoil** · 09-09-2022

Originally Posted by routercnc

I’ve looked into lots of options and one of them is to go for a 3kW motor (Chinese wc spindle) via a belt drive onto a DIY cartridge with an ER32 collet. With a ratio of 2:1 I get x4 the torque of my 1.5 kW direct drive spindle and 9,000 rpm. Or 1.5:1 I get x3 the torque and 12,000 rpm. I’ll need to check the max rpm of the bearings I use for the cartridge.
Anyway only planning at this point so my question is can I run the 3kW spindle off a standard UK circuit (13A). The spindle claims it runs up to 10A which is OK on paper but I wanted to check any real world usage, thanks.

Another option might be to go for a constant power spindle, i.e. one where the torque increases as the speed decreases/ I have one from Jian-Ken and it chomps through ali nicely.

**routercnc** · 10-09-2022

Originally Posted by Voicecoil

Another option might be to go for a constant power spindle, i.e. one where the torque increases as the speed decreases/ I have one from Jian-Ken and it chomps through ali nicely.

Do you have a link?