[Biggs427]

What's the inductance of the motors? This value + voltage to the drive will tell how fast your stepper can spin.

What kind of linear motion do you have? From what I see in your GRBL config it looks like 5mm pitch ballscrew.

15mm/sec2 is really low and if I happen to be right, 1200mm/min should be 250rpm shouldn't be too hard to obtain. Unless your steppers inductance is really high.

Have you tested to decouple the stepper from the linear motion and spin it by hand? Maybe it binds somewhere.

[charlie1126]

I am using a linear kit that I bought on ebay. This is what is included.

2 x SBR20-300mm Linear guide

2 x SBR20-600mm Linear guide

2 x SBR20-1000mm Linear guide

12 x SBR20UU Linear blocks

1 x SFU / RM 1605-350mm- C7 ballscrew with nuts and end machined

1 x SFU / RM 1605-650mm - C7 ballscrew with nuts and end machined

1 x SFU / RM 1605-1050mm- C7 ballscrew with nuts and end machined

3 x BK / BF 12 support for ballscrew

3 x 6.35mm*10mm Couplings

[charlie1126]

I have tested the motors by spinning them by hand and they spin fine. No binds.

Shaft diameter 8 mm; Shaft length 20 mm; Body Length 76mm; full length 97mm; Step Angle 1.8° Step Accuracy 5% Holding Torque 1.9N·m (269oz·in) Rated Current/phase 3.0 A Phase Resistance 1.2 ohms Rated Voltage (≠driving voltage) 3.6 V Inductance 3.7 mH ±20%

4amps is the max current.

What's the inductance of the motors? This value + voltage to the drive will tell how fast your stepper can spin.

What kind of linear motion do you have? From what I see in your GRBL config it looks like 5mm pitch ballscrew.

15mm/sec2 is really low and if I happen to be right, 1200mm/min should be 250rpm shouldn't be too hard to obtain. Unless your steppers inductance is really high.

Have you tested to decouple the stepper from the linear motion and spin it by hand? Maybe it binds somewhere.