gearbox torque?!?!?
gearbox torque?!?!?
(OP)
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!!
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!!





RE: gearbox torque?!?!?
RE: gearbox torque?!?!?
RE: gearbox torque?!?!?
1 Watt = 1 Newton meter/second
So you've got 2.5 * 9.81 Newtons and 10 / 1000 meters/second
Which gives you
2.5*9.81*10/1000 Watts
RE: gearbox torque?!?!?
http://www.mcmaster.com/#linear-actuators/=20pezx
I'm sure there are smaller ones available.
RE: gearbox torque?!?!?
(at a relatively cheap price that is) if you know where i could find such a part please let me know!
RE: gearbox torque?!?!?
See notes in spread sheet.
RE: gearbox torque?!?!?
RE: gearbox torque?!?!?
http://www.linak-us.com/
Benta.
RE: gearbox torque?!?!?
ht
you might use a small gearmotor and a crankshaft and rod to move the syringe plunger. Pretty much any available small gearmotor would do that task. Syringe speed would vary with position a bit.
You could instead use such a gearmotor to drive a lead screw- McMaster offers Acme thread lead screws and mating nuts I'm sure. These gearmotors are pretty beasty, they drive a load of 100's or 1000's of lbs- and surely smaller such units are made:
http://www.aerotech.us/productmanuals/qm1027.pdf or
http://74.
Have you considered just using a small air cylinder to move the syringe, and a simple controller to apply the air to extend or retract the cylinder as needed? Presuming you have compressed air available of course.
I doubt that solenoids as listed above would work well, because the force varies greatly with the position of its core rod.