I would like to hear your suggestion regarding practical use of electric piston.
This are project requirements.
1.) Piston movement --> 5 cm back / forth
2.) Piston speed is regulated by impulses from arduino. There will be two impulses. One from magnetic contact and second from weight detector.
3.) Speed of piston movement is variable and fastest option is 1 stroke ( back/forth ) i one second.
4.) Now the interesting part....piston should move heavy and light weight. Depending on incoming impulse. If the object is heavier then 3kg, piston will have some longer predefined time, to move this object to other position, if it's lighter, then some other option will be activated... Overall weight will be between 500 grams and 3 kg but i think that most objects will be in 0.5 to 2kg range.
My question would be... What to use in such scenario ? I dont want to use hydraulic system but i dont know if i can make something like this with some electric piston.
arnix:
:-). You are correct.
It's linear actuator..
Thank you for clearing that up! Now, what linear actuator are you designing for? I have a couple on a shelf that will each move 1,000 lbs. Specks, please or link or data sheet.
The speed of a typical linear actuator is determined by the voltage fed to the motor, so it certainly can be controlled. Most can't go up to 100mm/s though, so you'll have to shop around or make your own.
Are there any other constraints like size, weight, energy efficiency, long life, etc.?
@ChrisTenone
I was thinking about solenoid too but i dont know if this can be controlled for such speed. Power consumption should be under 30W and I will use 12V / 3A power supply.
@Paul_KD7HB @ dekutree64
my main job is to find some solution that can move some object in some predefined time. Circuit will be mounted on existing machine and you can look at this like on some sorter. size and weight are not a problem but power consumption is limited to 30W and circuit will be online 24/7.
I guess that actuator / solenoid should work flawless at least 1 to 2 years.
Btw. This system will be installed in factory, so there is no problem with atmospheric conditions.
A.
dougp: @ChrisTenone
So, another commercial-enterprise-seeking-solutions-on-a-hobbyist-forum thread?
Why single me out? My only contribution to this thread was to suggest the word "solenoid".
As I said in the previous thread about this, I'm fine with commercial help unless the OP tries to obscure information in order to obtain technical expertise. The other guy said 'I won't share my code because it's for work.'
And who knows, maybe this is a hobby factory? We have hobby farms ...
You should be ok on power, since 3kg at 100mm/s is only about 3W. Going by the stats on Firgelli actuators (Premium Linear Actuators | 12-24v | FIRGELLI) 30W into a geared leadscrew gets you at least 8W of useful pushing power, or about 25% efficient. So your input should be 12W at most.
If you don't need the static holding behavior of a leadscrew, then a ball screw would be even better since they're much more efficient and won't get hot running continuously. Could get rid of the gears, too. For commonly available ball screws with 12mm diameter/4mm pitch, you get over 9:1 mechanical advantage just from that. And to get 100mm/s output, the motor RPM will need to be over 1500 without any gearing, which is reasonably fast, and torque around .02Nm, which is reasonably low.
For commonly available ball screws with 12mm diameter/4mm pitch, you get over 9:1 mechanical advantage just from that
The mechanical advantage of a leadscrew is not a dimensionless quantity - its angle/distance, which
has units of rad/m (or arguably N/Nm). You can only say it has a 9:1 advantage over some other
leadscrew with 1/9th the value! There is no natural unitary leadscrew to compare to, as with
a gear system or lever.
MarkT:
The mechanical advantage of a leadscrew is not a dimensionless quantity - its angle/distance, which
has units of rad/m (or arguably N/Nm). You can only say it has a 9:1 advantage over some other
leadscrew with 1/9th the value! There is no natural unitary leadscrew to compare to, as with
a gear system or lever.
Thanks. I was going by circumference / pitch, looking at it as a mechanical incline wrapped around. But I did feel like I might be doing it wrong, since then calculating between motor torque and linear force involves knowing the screw radius, which seems a bit weird
I wrote yesterday detailed reply on your posts but it looks like its been deleted so i will post new but shorter version....
Factory:
No, its not commercial project. It's just idea how to help friend which has micro company ( 2 employees ).
Beside, i guess there are bunch of ready made commercial solutions for this. Anyhow....
My question would be:
can i move some 3 kg object in one second ( 5 cm range from x to y point )
We have hobby farms ...