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Seeking SMC Pneumatics Advice
I'm hoping for advice from SMC users. We've never used pneumatics and are looking to purchase SMC valves and a manifold.
I'm leaning towards purchasing the SY3000 body ported valves (SY3120 and SY3220) and manifold with the "M" connector option because the manifold is smaller and lighter than the base mount manifold and the tubes and wires will protrude from the top of the assembly rather than the sides. I'm thinking that connections at the top of the assembly will be easier to access than ones from the side. I'm thinking how much easier it is to package and access connections to the cRIO in contrast to the Power Distribution module for example. However, other CD posts I've seen refer to the base mounted style (SY3140 and SY3240). What has your experience been and why would you prefer one style over the other? Thanks! |
Re: Seeking SMC Pneumatics Advice
Realize the rules for 2013 may not be the same for 2012....
The way the pneumatic rules are written with an odd Cv value & ports size restrictions makes it easier to conform to the rules while having maximum flow through the valve using by individual valves rather than a manifold. The robot inspectors are used to seeing individual valves. I try to make their job easy. |
Re: Seeking SMC Pneumatics Advice
We've used manifolds for two years now. It does simplify the plumbing of the robot and a single manifold for several valves is much more compact than each valve having it's own manifold.
In 2011 we used a 5 port manifold with Base-mounted valves. This means air was supplied in one end of the manifold and was directed out a port on the side of the manifold below each valve. In 2012 we used a 5 port manifold with Body-ported valves. This means air was supplied in one end of the manifold and was directed out the top of each valve. Both configurations save space over what you would normally end up with each valve having it's own manifold. Both configurations also save some weight. Depending on where you plan on placing your manifold one configuration might work better than the other. For 2012 our valves were from the SY3120 series. In 2011 we used SY3140 series. Manifolds are perfectly legal for use in FRC per the last couple of years rules. YES you do have to work harder to find the proper cV value for your valve/manifold combination. YES you do need to have proper documentation proving they are legal. Inspectors have never had any trouble with manifolds in my experience and we've never even had to pull the specifications up. |
Re: Seeking SMC Pneumatics Advice
Here is a paper from Adam:
http://www.chiefdelphi.com/media/papers/2414 Its what 973/1323/1477 have used. A lot of other teams probably have as well. -RC |
Re: Seeking SMC Pneumatics Advice
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A question about the 2012 port size rule (R71): Quote:
Would a valve with 1/4" push-to-connect ports be legal? (1/4" push-to-connect fittings work with the KOP-supplied 1/4" tubing.) ...or would we have to purchase valves with 1/8" NPT ports and then add 1/8" NPT to 1/4" push-to-connect fittings to be legal? An installation would be a lot cleaner if the valves already had 1/4" push-to-connect ports since those interface directly with the required tubing. |
Re: Seeking SMC Pneumatics Advice
For what it's worth, we've used the SMC manifolds for years and if you have a LOT of valves they can make sense. I doubt they are lighter, though. The 4 and 8 valve manifolds are milled out of a solid block of aluminum and are pretty hefty.
Last year we only had three valves on our robot so I got the SY3240-6LO and SY3140-6LO valves that are body ported. The kids liked them a lot better. There are fewer fiddly little parts to mess with and they mount easily. I like them because they are easier for the new members to understand and are easier to re-purpose after the competition season. The big lesson I've learned is that these little valves are delicate, expensive little watch-like devices. Don't make the same mistake we did and store them in a box with the rest of your pneumatic junk. We've lost more valves to getting knocked around in that box than any other source. I've never known an inspector to care about 1/8" NPT fitting rule as long as you can show that the valve meets FIRST specs and you don't have valves with giant fittings (which probably means they don't meet FIRST specs anyway.) After all some valves don't even have threads, the fitting is integral with the valve. Your mileage may vary. |
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Re: Seeking SMC Pneumatics Advice
I am glad to hear inspectors are generally reasonable about these things. The problem comes when an inspector hangs on the letter of the rule. I seen it happen with other rules...
Please do not taken this as inspector bashing. They are volunteers trying to the best they can. I have found them to be generally reasonable and always professional. |
Re: Seeking SMC Pneumatics Advice
We don't use the manifold mounted valves because we always want to mount the valves as close as possible to the cylinder they are connected too. This is so we save as much air as possible.
You loose all the air in the hose running to the cylinder from the valve and this can amount to a significant amount of air. We want to have our compressor run as little as possible. I really wish FIRST would dump the whole CV thing, try and find the actual CV rating of a valve? |
Re: Seeking SMC Pneumatics Advice
We have used manifolds the last two years (5 port). They make plumbing and wiring much simpler. One inlet to the manifold, one mounting location, wires all to one place.
Our only challenge is that some of the manifolds are tough to mount fittings side by side on. We use short extension fittings for every other port. The Cv rating is for the valve itself, not the manifold or other base. |
Re: Seeking SMC Pneumatics Advice
I understand how the wiring is easier but I don't understand how the plumbing is.
When we mount the valve close to the cylinder we only have to run one hose up to that area instead of two. To me this is simpler, cleaner and uses much less air. But to each his own :) Cv will vary according to the pressure used and even temperature, it must be calculated for every given situation. It is a poor value to use for our purposes. |
Re: Seeking SMC Pneumatics Advice
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-One Central Spot for wiring -One Central Spot for turning off and on solenoids manually. -One airline to power all x amount of solenoids, this year we used 6. So it reduced the amount of air by 5 lines. -Its not messy, as I don't have to deal with solenoids in 6 or more spots. -Also you can blank off spots your not using for around $2-4 bucks and add solenoids super easy. This year we thought we were using 6 solenoids, so we bought the 8 guy. Overall we really like the SMC Manifold. -RC |
Re: Seeking SMC Pneumatics Advice
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The common manifold requires longer runs to cylinders, but it has less fittings overall as there is a single input for all solenoids; that combined with the fact that an N-port manifold is far less space used than N single solenoids makes the layout a lot cleaner for most robots. |
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-RC |
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