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Calculating motor torque required to operate a syringe type paste exrtruder

I'm looking into making a paste extruder using a syringe. Does anyone know how to calculate the required torque to drive it and the pressure that will develop inside the syringe?
I couldn't figure out how to calculate the required force, so I went with what I thought would be enough. Keeping fingers crossed... starting tests tomorrow.


http://forums.reprap.org/read.php?166,528570
Re: Calculating motor torque required to operate a syringe type paste exrtruder
June 09, 2018 04:00PM
I did not know how to calculate it either, but after breaking one tube I had to learn it: [fightpc.blogspot.com]

Just for other readers looking for answers (but most likely too late for the OP :-).
Re: Calculating motor torque required to operate a syringe type paste exrtruder
June 10, 2018 02:27AM
Do you know how much pressure you need? If so then the torque needed to produce that pressure is easy enough to calculate:

Work_per_turn = plunger_area * leadscrew_lead * pressure = motor_torque * 2 * pi * leadscrew_efficiency

Solve for torque or for pressure.


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