Feed Rates and cutters for wood panels

[jimbo_cnc]

As I understand it, I'm below corner speed even at max feedrate, so I have full torque available.

Advantage slow machine! :)

[Ger21]

The only time you have "full torque" available is when the motor is not spinning. That's why it's called holding torque. As soon as it starts spinning, the available torque starts decreasing.
If you're spinning so slow that you don't lose much torque, then your resolution is probably poor.

[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.