HME Technology router NEE AMC-E controller WinAMC software

[Jonathan]

Since the existing driver uses 37 volts (odd number) you don't want to go below that as then you wouldn't be able to run the machine at the original feedrates. I'd want to use a higher voltage to get better acceleration, particularly as those are Nema 34 motors which will be slow on that voltage.

If you're after a '1-box' solution I could make one for a similar price to the one from DIYCNC, except with the 4.2A, 50V drivers and just under 50V power supply (or the 70V drivers). Plus including whatever else you need, spindle control etc. PM me if your interested.

Why do you say holding torque would be more important than feedrate? The forces on the cutter / machine are tiny when it's not moving! Alternatives to the Kress are the 1.5kW and 2.2kW water cooled spindles on eBay. Not cheap, but you get what you pay for in my opinion ... see recent discussion in other threads.

[artmin]

Why do you say holding torque would be more important than feedrate? The forces on the cutter / machine are tiny when it's not moving!

Just my ignorance! I assumed that when stationary, the motors would be maxxed out to prevent any movement .



Thanks for that link 2e0poz, but he hasn't had a good start on the 'bay. Mind you, ebay can treat sellers like dirt


I'll send you a PM Jonathan

[Jonathan]

Just my ignorance! I assumed that when stationary, the motors would be maxxed out to prevent any movement .

When stationary is the only time the motors will deliver their rated torque, so 1.5Nm. To calculate the holding force you need to know the pitch of the ballscrew and the diameter. For example if it's a standard 16mm ballscrew with 5mm pitch and direct drive gives holding force of about 1880N with your motor, plenty!
(Formula is F=2*T*pi/p where T is torque and p is pitch if anyone's interested)