Hey there,
I'm building a large-ish CoreXY and wanted to control the Z axis with three NEMA 17's. Two on the front corners and one on the rear. I guess they could be operated separately for bed leveling but let's not worry about that just yet.
Anyway, I was hoping to run them in parallel from a standard Mega2560 and RAMPS 1.4 board.
Is this possible at all?
Motor specs would be this in a NEMA 17 package:
Step Angle: 1.8
Motor Length: 48mm
Rated Current: 1.8A
Phase Resistance: 1.8Ohm
Phase inductance: 3.2mH
Holding Torque: 78oz.in - 55.1N.cm - 5.62kg.cm
Detent Torque: 2.6N.cm
Rotor Inertia: 68g.cm2
Flying Lead Count: 4
Flying lead length: ~300mm
Step angle accuracy: ±5%(full step,not load)
Resistance accuracy: ±10%
Inductance accuracy: ±20%
Temperature rise: 80c Max(rated current,2 phase on)
Ambient temperature: 20c~+50c
Insulation resistance: 100M Min,500VDC
Insulation Strength: 500VAC for one minute
They're usually run off a single A4988 but the design I'm working from actually has 2x motors run in parallel. Guessing the ~5.4A required for three motors might be too much though haha.
I don't mind if it's a case that I need to put pins into the RAMPS headers and hook them up to something more beefy, sitting in a separate module. Just as long as there's a way to drive three steppers off the one "signal".
Help please!
I'm building a large-ish CoreXY and wanted to control the Z axis with three NEMA 17's. Two on the front corners and one on the rear. I guess they could be operated separately for bed leveling but let's not worry about that just yet.
Anyway, I was hoping to run them in parallel from a standard Mega2560 and RAMPS 1.4 board.
Is this possible at all?
Motor specs would be this in a NEMA 17 package:
Step Angle: 1.8
Motor Length: 48mm
Rated Current: 1.8A
Phase Resistance: 1.8Ohm
Phase inductance: 3.2mH
Holding Torque: 78oz.in - 55.1N.cm - 5.62kg.cm
Detent Torque: 2.6N.cm
Rotor Inertia: 68g.cm2
Flying Lead Count: 4
Flying lead length: ~300mm
Step angle accuracy: ±5%(full step,not load)
Resistance accuracy: ±10%
Inductance accuracy: ±20%
Temperature rise: 80c Max(rated current,2 phase on)
Ambient temperature: 20c~+50c
Insulation resistance: 100M Min,500VDC
Insulation Strength: 500VAC for one minute
They're usually run off a single A4988 but the design I'm working from actually has 2x motors run in parallel. Guessing the ~5.4A required for three motors might be too much though haha.
I don't mind if it's a case that I need to put pins into the RAMPS headers and hook them up to something more beefy, sitting in a separate module. Just as long as there's a way to drive three steppers off the one "signal".
Help please!