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1  Community / Gigs and Collaborations / Need to hire someone for a project on: January 22, 2013, 05:05:53 pm
Hey guys.....I am sure I can eventually figure out how to do this stuff but time constraints are going to limit me making this project work.

what I need to do is pretty simple, I need to make an arduino track the position of a rod and move it with a potentiometer.

basically I have an electro-hydraulic actuator that uses a 12vdc motor to move a rod in and out.....its basically a high speed high force linear actuator. the actuator is setup with 2 leads 1 for power and one for ground, hook it up one way and the shaft moves out and vice versa.

I was thinking of using https://www.sparkfun.com/products/8607 to track the position and then just another pot to move the shaft to the specified position.

I am sure this is a fairly simple setup but like I said I don't have much time to set it up and make it work.

I am willing to "hire" someone to help me out with this because I need it ready to go within a couple months.

you can email me @ r.parson@telus.net

thanks,
2  Using Arduino / Motors, Mechanics, and Power / Re: Position control on: November 18, 2012, 01:48:37 am
The actuator I listed is high speed and good precision, it's priced at roughly $6-700 bucks. Is anyone able to point me in the right direction of creating the position control for this?

Thanks,
3  Using Arduino / Motors, Mechanics, and Power / Re: Position control on: November 16, 2012, 03:16:18 am
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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.

You could attach a linear pot to the moving shaft, or simply use foward and reverse travel limit switches.

If I use a pot as a feedback device then use another pot as an input device to change the position? For every change of voltage the shaft will move a certain distance? Would that work?
4  Using Arduino / Motors, Mechanics, and Power / Re: Position control on: November 13, 2012, 09:01:20 pm
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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,
5  Using Arduino / Motors, Mechanics, and Power / Re: Position control on: November 13, 2012, 01:57:45 pm
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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!
6  Using Arduino / Motors, Mechanics, and Power / Position control on: November 12, 2012, 01:37:13 pm
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,
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