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Calculating motor torque required to operate a syringe type paste exrtruder

the_digital_dentist

Calculating motor torque required to operate a syringe type paste exrtruder
May 22, 2015 11:22AM

Registered: 12 years ago
Posts: 5,788

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?

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the_digital_dentist

Re: Calculating motor torque required to operate a syringe type paste exrtruder
July 03, 2015 12:31AM

Registered: 12 years ago
Posts: 5,788

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

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misan

Re: Calculating motor torque required to operate a syringe type paste exrtruder
June 09, 2018 04:00PM

Registered: 13 years ago
Posts: 972

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 :-).

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dc42

Re: Calculating motor torque required to operate a syringe type paste exrtruder
June 10, 2018 02:27AM

Registered: 10 years ago
Posts: 14,683

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.

Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].