Feed Rates and cutters for wood panels

[jimbo_cnc]

page 3
https://www.geckodrive.com/gecko/ima...cs%20Guide.pdf

Torque doesn't start reducing straight away, it's not until corner speed it falls off.


Resolution is what it is. It's 10mm pitch direct drive and I don't have the option to gear the motor faster on this machine. Driver has serious micro-stepping capability, depending on how you think theoretical resolution translates into real-life accuracy.


When I add power into the calcs, it may reveal some acceleration problems at lower speeds.

[Ger21]

Look at a chart from a motor manufacturer. They don't look like the one from Gecko.
Torque starts dropping immediately.

[Jonathan]

At very low speed the torque is approximately 2/3rds of the rated holding torque. The then gradually lowers from that value then quickly drops off at the corner speed.

[jimbo_cnc]

The first chart from the first hit on google looks a lot like the gecko chart :)
http://www.orientalmotor.com/product...-only-1-8.html

But I see many different characteristics, so yes, new torque model needed before I look at power and stall.

[Ger21]

Yes, 60oz motors have flatter torque curves. But we don't use those.

[JAZZCNC]

Yes, 60oz motors have flatter torque curves. But we don't use those.

And if you find a Chinese supplier that gives you an accurate Chart for that particular motor then Frame it because it will be a Rare thing.!!

[jimbo_cnc]

Ger21 was right about the acceleration. 0.2g would be good.
Just spotted I was putting 12A into my 4A motors!

^Am I right(that I was wrong!). What sort of current should I put in 'Set phase current' box?


It was all seeming too simple, both options were more than adequate. Now I'm down to much lower accelerations, and that's still with the optimistic flat torque model.

I've taken advantage of higher ball screw efficiency, and better value for screw inertia.

I need to program some realistic cutting operations to see if I can spot any difference between the machine options.