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Topic: Position control (Read 2 times) previous topic - next topic

Robparsons86

Hey guys....I need your advice on making a decision.

I am trying to make an actuator to push a hydraulic clutch master cylinder and I don't want to sped over $1000 on it. I am curious if I can get accurate position control probably within the .0325" range if I use this magnetic encoder http://store.makerbot.com/magnetic-linear-encoder-v1-2-kit.html

And I want to control the position of this actuator http://www.parker.com/portal/site/PARKER/menuitem.de7b26ee6a659c147cf26710237ad1ca/?vgnextoid=fcc9b5bbec622110VgnVCM10000032a71dacRCRD&vgnextfmt=EN&vgnextdiv=&vgnextcatid=6147618&vgnextcat=COMPACT+EHA+ELECTRO-HYDRAULIC+ACTUATOR&Wtky=ACTUATORS

I am also curious if I should use a rotary encoder to send a signal for the position or should I use a potentiometer?

I want to hook it all up to the arduino so that when I pull a lever the rod moves in conjunction with how much I pull the lever, if the lever is half pulled then the rod is half extended. I want full range control of the rods position via the lever.

I am super new to the arduino stuff but I do have a basic understanding of how things work, I need your opinions before I spend $500 on the actuator.

Let me know if this will work.

Thanks,

zoomkat

Quote
I am trying to make an actuator to push a hydraulic clutch master cylinder and I don't want to sped over $1000 on it.


Perhaps you should consider getting an electric linear actuator that has an internal pot (probably less than $150).
Consider the daffodil. And while you're doing that, I'll be over here, looking through your stuff.   8)

Robparsons86


Quote
I am trying to make an actuator to push a hydraulic clutch master cylinder and I don't want to sped over $1000 on it.


Perhaps you should consider getting an electric linear actuator that has an internal pot (probably less than $150).


Can't....not enough force vs speed I can get high force but low speed and vice versa!

Need to move a clutch master cyl 1.2" as fast as possible!

zoomkat

Quote
Need to move a clutch master cyl 1.2" as fast as possible!


How fast? How much force required? In automotive clutch applications the speed of a master/slave hydraulic system may be limited by the size of the tubing connecting the two cylinders. Are you sure the electrohydraulic actuator you have chosen will meet your specifications? In hydraulic systems that require quick response, pressurized accumulators are usually used as the hydraulic pumps themselves may not move the fluid very fast.
Consider the daffodil. And while you're doing that, I'll be over here, looking through your stuff.   8)

Robparsons86


Quote
Need to move a clutch master cyl 1.2" as fast as possible!


How fast? How much force required? In automotive clutch applications the speed of a master/slave hydraulic system may be limited by the size of the tubing connecting the two cylinders. Are you sure the electrohydraulic actuator you have chosen will meet your specifications? In hydraulic systems that require quick response, pressurized accumulators are usually used as the hydraulic pumps themselves may not move the fluid very fast.


This is a stand alone hydraulic unit with built in resivoir and pump.....max speed of unit is 3.1" a second and it has a hiqh force that will be adequate for what I am doing. This actuator will work but it is just a dc motor driving it! I need some sort of position control for my application.

Thanks,

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