Tweco iCNC XT - Manual (Page 51)

iCNC XT
Manual 0-5299 INSTALLATION 3-31
3.24 Setting Correct Inertia Ratio
Put the USB cable to the Y-Drive and connect to the drive (follow instructions on section 6.5).
Select Tuning and click Tuning.
1. Click Execute.
2. Use the following formula to determine your inertia ratio Note this only applies with SGMJV 04/08 motors and Neugart PLE60/80
gearboxes.
400W
[Metric] 0.00035 x gantry weight per motor [kg] x effective diameter of pinion ² [mm] = Inertia ratio
[Imperial] 0.1 x gantry weight per motor [pounds] x effective diameter of pinion ² [inch] = Inertia ratio
750W
[Metric] 0.0001 x gantry weight per motor [kg] x effective diameter of pinion ² [mm] = Inertia ratio
[Imperial] 0.03 x gantry weight per motor [pounds] x effective diameter of pinion ² [inch] = Inertia ratio
Example:
Dual drive system so the gantry weight is divided to 2 motors.
Gantry weight = 400kg (882 lb.).
Gantry weight per motor = 200kg (441 lb.).
Motors = 400W
Effective pinion diameter = 30teeth, module 1.5 = 45mm
0.00035 x 200kg x 45 ² = 141.75
Inertia ratio = 142%
Round up the calculated value to the next even one.
NOTE
If you are unsure about your inertia ratio, please contact Victor Technologies technical support for assistance.