[HH] Opening a skull (on topic, honest!)

[Greg London]

Has anyone used these guys?

http://www.uxcell.com

I ask because they have really, really, low prices on stuff.

http://www.uxcell.com/pneumatics-c-1920_1921.html

16mm Bore 25mm Stroke Single Rod Double Action Air Cylinder for $9.99

Their prices seem so low compared to other pneumatics sources
that I wonder if its really just some kind of scam.
Or the parts are complete junk (which is one particular kind of scam).

But if its legit, a pneumatic skull would be within the realm of
possibilities.

One of the projects I wanted to do with the microcontroller was
to make a smart steam valve for some of the radiators in my house.
Then I started looking at solonoid valves that could handle steam,
and they were usually a couple hundred dollars.

uxcell has one for $17.

http://www.uxcell.com/24v-320ma-76w-thread-dia-port-position-solenoid-valve-p-176976.html

Greg





> Mark Komarinski wrote:
>> Ah, a friend gave me [a solenoid] that is in two pieces (the inner shaft
>> can be
>> removed from the solenoid).
>
> Yes, that's a typical design. The first of the two products I linked to
> is like that.
>
>
>> The range of movement was rather small but
>> after thinking about it may be enough to get the jaw to open.
>
> A lever will increase the travel. Or just find a different solenoid with
> a longer travel.
>
> If you don't need a lot of force, and have a solenoid with a removable
> plunger, you can stretch beyond the manufacturer's travel specification,
> but I believe the force decreases following the inverse square of the
> distance.
>
> Automotive door look actuators can be a good source for fairly long
> travel solenoids (technically I think some are motors). This one:
>
> http://www.amazon.com/HIGH-POWER-DOOR-LOCK-ACTUATOR/dp/B0002KR9PW
>
> has 3/4" travel, and instead of using a spring return you reverse
> polarity.
>
>  -Tom
>
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