Router has died. Need Advise Please.

[Jonathan]

The spindle power output is roughly proportional to the speed, so at just 3000rpm you only get a fraction of the rated 1.5kW. The question to ask therefore isn't, 'what is the minimum speed the spindle will run at?', it's 'at what point is the power output of the spindle too low to be useful?'.

If the list of materials you are cutting is complete, then the 1.5kW spindle will be fine. The only thing it would struggle at is if you need to drill the aluminium, but if you've got a pillar drill that's clearly not a problem.

I just checked here Cutting Speeds - LittleMachineShop.com
and for a 6mm cutter is says about 2500 rpm for aluminium, I'm no expert on this though so just using the figures given.

With a 6mm carbide cutter you'd use around 13000rpm.

Would just need coolant pump Radiator and tank I think this is the way I will go if you think this would work for me?

Yes and you wont even need the radiator if you have a good size tank of water/favorite solution.