Well here goes... Aluminium frame router design

[Clive S]

The problem with big pulleys I am led to believe is the inertia that they have. I have no idea on how much the belt will sag but you can always add the belt cover when you have it up and running.
You will need to run a 70V power supply for the motors.

[njhussey]

I'm running my Nema 34 on a 230V Kinco driver and at the moment it's running on 10 m/min rapids and very happy, had it on 15 m/min and was still happy but don't need that sort of speed. I got the 40 tooth pulleys as the Nema 34 has bags of torque and I wanted as much tooth engagement as possible...

I've not noticed any whip on change of direction...

[Clive S]

Neil I thought you had used 230V but when I looked at your schematic I saw three drives connected to the PS did you originally go with nema 23 all round?

[njhussey]

Neil I thought you had used 230V but when I looked at your schematic I saw three drives connected to the PS did you originally go with nema 23 all round?

I've got an AM882 driver for a 4th axis as well now but did originally plan to use a Nema 23 on all axis as the calculator showed I'd be able to use it on the X axis but I decided to play it safe and go up a size.

[Clive S]

I've got an AM882 driver for a 4th axis as well now but did originally plan to use a Nema 23 on all axis as the calculator showed I'd be able to use it on the X axis but I decided to play it safe and go up a size.

Ah! that fooled me

[njhussey]

On the schematic it only showed the two AC wires that were going to the driver, don't think I even put a representative box on it....

[njhussey]

How about your spindle? You'll also need a bit extra for cable tray, cables water tubes etc....

[CharlieRam]

How about your spindle? You'll also need a bit extra for cable tray, cables water tubes etc....

Doh! I completely forgot about the spindle, Won't do much without one will I

[CharlieRam]

Just had a look at spindle weight and it looks like 5.6kg, maybe another 1kg for cable and pipe so total weight comes in at 60.7kg

[Neale]

Quick answer to your question about "2 volt motors". Ignore motor voltage ratings. For all practical purposes, they are irrelevant. The control electronics are driving short pulses through the motor windings and include some clever controls on motor current, which is the important bit. The motors work using magnetic fields; the higher the current the stronger the field and the more torque you get out of the motor. However, the motor windings are coils of wire which have inductance. In this situation inductance is a bad thing because it slows down the rate of increase in current at the start of each pulse so you lose power. To get round this, you drive the coils with many times their rated voltage - maybe 60-70V for a nominal 2-3V motor - so the current builds more quickly. Then the current limiter in the driver reduces the applied voltage automatically during the pulse so the motor isn't over-driven. This all happens like magic and all you need to know about is the current limit setting in the driver module which should match the motor.