Finding a Gearbox Motor for Torque-Heavy Syringes

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Discussion Overview

The discussion centers around selecting an appropriate gearbox motor for driving syringes in a mechanism, specifically focusing on the torque requirements and motion specifications. Participants explore various motor types, power requirements, and mechanical setups to achieve a desired stroke length and speed.

Discussion Character

  • Technical explanation
  • Exploratory
  • Debate/contested

Main Points Raised

  • One participant expresses uncertainty about how to measure the required force for the gearbox motor, noting that 2.5 kg is needed to drive the syringe forward at a satisfactory speed.
  • Another participant suggests that a high torque, low RPM motor is necessary to drive the shaft effectively.
  • A specific recommendation is made for a brushless motor with a power rating of 200 Watts and specific current ratings.
  • One participant calculates that a power requirement of approximately 0.25 watts may suffice for the task, proposing a stepping motor with a lead screw as a viable solution.
  • Another participant agrees with the use of lead screws, highlighting their advantages in terms of power and smooth movement.
  • A suggestion is made to source components from McMaster Carr, indicating it as a resource for motors and other mechanical parts.

Areas of Agreement / Disagreement

Participants express varying opinions on the type of motor and mechanical setup to use, with some favoring brushless motors while others advocate for stepping motors with lead screws. The discussion does not reach a consensus on the best approach.

Contextual Notes

Participants mention specific calculations and recommendations, but there is no agreement on the exact specifications or types of motors needed, indicating potential dependencies on specific application details and assumptions about the mechanics involved.

Who May Find This Useful

Individuals interested in mechanical design, robotics, or automation, particularly those working with syringe mechanisms or similar applications.

bauboya
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gearbox torque?!?

Hi, I don't know much about mechanics and I'm trying to build a mechanism to drive a set of syringes, and I need to buy a gearbox motor to drive the syringe shaft forward and back. the syringe needs to be driven 70mm, and I'm going to attach a rack and gear to the motor to get this motion. however, because of the hydraulics, it actually requires quite a bit of force, and i don't know what gearbox motor will be strong enough to drive it. i didn't know how to measure how much force i need so i put weights on the shaft and it needs 2.5kg to drive forward at a good speed. (it doesn't have to be incredibly fast but i don't want it to be terribly slow either).

could anyone recommend a motor that will be strong enough to drive it at a good pace??
or tell me what information and numbers to look for in the data sheet??

thanks so much!
 
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the speed i want to drive it at is 10mm/sec
 


U need to buy high torque and low rpm motor to drive the shaft
 


Buy the brushless motor under the specification
Power: 200 Watts
*.RPM/Volt (KV): 1000
*.Continuous Current: 6-15A
*.Burst Current: 19A*
 


A 70 mm stroke at 10 mm/sec sounds straight forward. The required power is
P = F dx/dt = 2.5 Kg x 9.81 m/sec2 x 10 mm/sec x 1 m/1000 mm = 0.25 Newton-meters/sec = 0.25 joules/sec = 0.25 watts
So probably a 1 or 2 watt motor will suffice. A stepping motor turning a lead screw is one approach. 70 mm will be 55 turns on a 1/4-20 pitch screw. You can either count digital motor steps or use limit switches at the ends. 10 mm/sec will be about 8 turns/sec. A direct drive 480 RPM stepper motor on a 1/4-20 lead screw will work. The control electronics will be less if you use a DC gear motor geared down to 480 RPM with limit switches.
 


I don't know anything about steppers, but I definitely agree with Bob about the lead screws. You just can't beat those suckers for power and smooth movement. I use them for all sorts of stuff. They're incredibly easy to make, as well. Just take some threaded rod (or a bolt for short strokes) with a matching nut, and connect the nut to the thing that you want to move.
 


McMaster Carr on web. they got everything. motors, lead screws, metal, wire etc...
 

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