Hi, I ran on a specific problem during my work in lab. I need to create some mechanism which allow me to move light element on short distance (~0.2 mm) with high velocity (~10 m/s) with really good precision.
I already tried servo, stepper engine and even created a mechanical solution with springs. All that had some issues (slowness, not precision enough, too big steps etc.)
So I count on you with some creative solution for my problem.
Pneumatics?
Hydraulics?
Pyrotechnics?
You mean a light-emitting element? Could you use multiple lights and switch them on/off?
No, i meant lightweight. Sorry for being unclear.
Could You be more specific? I am experienced only in electonics. Have you got some solution on mind?
No, I don't think I could
Just spitting out creative thoughts.
Electrostatics?
Voice coil?
No object, even a lightweight object, can accelerate from rest to 10m/s in zero time, move 0.2mm and then stop in zero time. So what time is allowed to move 0.2mm?
I wonder if the actuators that move the heads in hard drives move that fast.
I am aware of that. But i need to achieve highest acceleration and deacceleration possible. I need to do a move in time like 20 ms.
A solenoid connected to a proper lever with a pivot point will allow you to easily do such a movement. You need to adjust your mechanical construction ability.
Thank you for that answer. I already considered it. I'm just a little bit affraid that this solution my not work because strong electric field is involved in my experiment. It can disturb mechanism to work or mechanism can influence on experiment results. Anyway I'll probably test it.
An electron could do that. Well, in a nanosecond or so. I'll bet even a proton could, too.
move light element on short distance (~0.2 mm) with high velocity (~10 m/s) with really good precision.
Details, please.
If your experiment is that sensitive, why are you introducing electrical stuff at all, especially Arduino stuff?
Every object with mass has an inertia - even as lightweight as electrone.
I need to move needle (syringe needle) by 0.2 mm in time of 20 ms. The clue is to stop that movement in shortest possible time to avoid vibration caused by inertia of setup. Another important thing is repetitiveness of procedure.
Where would like that energy to be dissipated?
Rethink your entire approach. There exist very fast injectors, so your present idea of using a syringe is a waste of everyone's time.
I don't use any syringe. I don't inject anything. I just need to move a needle.
It does.
It's hard to be specific in such a micro scale. I would guess that stopping should be shorter than a 2-3 ms.
Maybe it will be easier to describe when i post a video. Needle movement video
You can see a microscopic close-up of needed movement recorded in 3100 fps. This setup uses stepper engine 28BYJ-48. The needle moves 0.23 mm in about 23 ms. The problem is vibrations on start and end of movement. (For scale balls on video has diameter of 200 um.)
The the problem is your setup is allowing vibrations. Bolt it the concrete floor! Or bolt it to a concrete slab on your bench.
Setup doesn't vibrate before initiating movement. After many tests I affirm that vibration from video is caused by phisics of stepper engine mechanism.
Hi,
How about using the mechanism that moves HD heads.
They are known as "voice coil"
They are very fast and accurate.
Probably I will test it. Thanks for sugestion.