Why use scn5 linear actuators?

Topics and questions about actuators etc.

Why use scn5 linear actuators?

Postby ferslash » Fri 20. Jul 2012, 17:32

I have seen that a lot of projects uses scn5 linear actuators, they are kind of expensive compared to wiper motors, at first look, they seams to have better performance and weight moving capacity, but... i just saw in ebay a big range of linear actuators... from other brands or kinds, that were cheaper... this kind of actuators can replays the scn5? for example: http://www.firgelliauto.com/default.php?cPath=69

obviusly there has to be a reason for the price, but what is the reason??? does anybody knows why scn5 are that popular in this comunity (and why are expensive)?

best regards from mexico

fer
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Re: Why use scn5 linear actuators?

Postby Roadster2 » Fri 20. Jul 2012, 17:44

The majority of the 'alternative' actuators are much slower than the SCN5's and are virtually useless for our application. The SCN5 units enjoy their popularity, and price, because they are easy to interface to a PC and because there doesn't appear to be much out there to compare with them.
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Re: Why use scn5 linear actuators?

Postby sirnoname » Fri 20. Jul 2012, 18:35

Perhaps we collect the facts of this thread.

What do you think is the differnt between the price of wiper engines and SCN5?

I start with SCN5+interface+power+wirings = 900$ vs. wiper+interface+power+wirings = 400$.
May this be correct?

Then I would like to know the price of the simulator rigg.
Maybe about 1000$?

If you agree it is ~25% more expensive than wiper?
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Re: Why use scn5 linear actuators?

Postby ferslash » Fri 20. Jul 2012, 18:47

good point !
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Re: Why use scn5 linear actuators?

Postby motiondave » Sat 21. Jul 2012, 00:54

you could always use these instead of wipers, http://www.motiondynamics.com.au/worm-d ... orque.html
And perhaps use JRKs .
This works out to be about $500-$600 for the pair. And they are 180rpm, most wipers are 50-60 rpm.
http://www.youtube.com/watch?v=r2Y5kQyJ ... re=g-all-u here is me on mine. I buddy took the video and it shows underneath as well. This thing can really move sharp and hard! Videos do not do justice!
http://www.youtube.com/watch?v=ZbN8XF027lc this is a previous build with the same motors and single turn pots, still it was fierce!
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Re: Why use scn5 linear actuators?

Postby tronicgr » Sat 21. Jul 2012, 16:10

ferslash wrote:... but... i just saw in ebay a big range of linear actuators... from other brands or kinds, that were cheaper... this kind of actuators can replays the scn5? for example: http://www.firgelliauto.com/default.php?cPath=69


Did you notice the actual speed of these "High speed" actuators? 1.5-3 inch per second, it not that much of a use for motion simulator. An actuator must have at least 200mm/s to be considered of any use. For example SCN5 has 400mm/s (16inch/second) and SCN6 has 200mm/s (8inch/second).

Now the power of the motor is another issue. The SCN5 has only 10kgf capability... :roll:

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Re: Why use scn5 linear actuators?

Postby ferslash » Mon 23. Jul 2012, 18:25

thanks tanos and motion dave for your answers :D
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Re: Why use scn5 linear actuators?

Postby Riton » Thu 4. Oct 2012, 14:22

load speed drops dramatically, look curves manufacturer.
10kg is together with a small charge.
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Re: Why use scn5 linear actuators?

Postby motiondave » Thu 4. Oct 2012, 14:50

alpefe wrote:Hello, for me all SNC system actuators 5 and similar type, are very bad.
if they have speed, they have power, it is much better to use these other wipers or better http://www.motiondynamics.com.au/worm-drive-motors-en/worm-drive-motors/worm-drive-motor-12v-180w-180-rpm-20nm-torque.html .
with this other system, you may have 400mm/seg. speeds. and a force of 30kg>, so if you use 3 units and pneumatic assistance, you can move smoothly to the whole real speed.
but why bother and spend money foolishly?, is my opinion, a greeting.


And this is how the motors can move http://www.youtube.com/watch?v=ZbN8XF027lc
I have since refined settings and motion, and Bobbuilt is working with them as well now. And they move more weight that scn5.
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Re: Why use scn5 linear actuators?

Postby Riton » Thu 4. Oct 2012, 14:57

Yes it is very effective! it is springs ?
Floriske also uses it, it is a good solution.

I test as an equivalent system mass compensation, I think this is a good solution.

It is also possible to use the same kind of editing with SCN5.
Precision in movement and sensations are in my opinion the best on the cylinders SCN5
Last edited by Riton on Thu 4. Oct 2012, 15:24, edited 1 time in total.
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