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Short question topic

A place to ask general spud cannon related questions.
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Unread postAuthor: Gippeto » Wed Mar 28, 2012 11:36 pm

Haven't used nylon in a poppet style valve...have used Nylatron for a few though. Works fine at 3000psi.

I use an undercut design on the valve stem and face off the valve body flat. The stem is undercut with a ball end router bit, and the sharp edge faced off to leave a flat ~ .020" wide. The plastic part of the stem is ~ .060" wider than the port.

Seals easy (have never had to lap one), really good flow, and no wedging effect from the pressure. :)

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Unread postAuthor: Gun Freak » Fri Apr 06, 2012 9:48 pm

I got another vacuum motor but this time it's way smaller and runs off a rechargeable battery (chordless vacuum). So it's also much weaker... Maybe it won't nearly kill me like the last one :roll: So anyway, my question is since this is DC, is it possible to run it on AC without blowing it up?
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Unread postAuthor: Gun Freak » Sat Apr 07, 2012 8:17 pm

Anyone...
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Unread postAuthor: warhead052 » Sat Apr 07, 2012 8:31 pm

You could try, if you got it free then its worth a shot.
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Unread postAuthor: MrCrowley » Sat Apr 07, 2012 8:46 pm

Gun Freak wrote:I got another vacuum motor but this time it's way smaller and runs off a rechargeable battery (chordless vacuum). So it's also much weaker... Maybe it won't nearly kill me like the last one :roll: So anyway, my question is since this is DC, is it possible to run it on AC without blowing it up?
Just find some form of charger that converts AC to DC. You could probably grab the charger for the vacuum battery and just wire it directly to the vacuum motor assuming the vacuum motor draws what the charger puts out. I've used 12v drill chargers to rewire and power fridge compressors.

I'm by no means an expert but my understanding is that you can use a 240v (or whatever you use in America) to 12v (or whatever the vacuum motor runs off) transformer that has a rectifier in it. The transformer steps down the AC voltage and then I assume there is a rectifier that turns it in to DC from AC.
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Unread postAuthor: warhead052 » Sat Apr 07, 2012 9:16 pm

Crowley, if we used 240v our stuff would fry out in a heat beat. I am pretty sure its 120v for most things, but 240v for stuff like washing machines and ovens and that sort.
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Unread postAuthor: MrCrowley » Sat Apr 07, 2012 9:29 pm

Yeah well just use whatever it is you use in America, 240v was just an example ;)
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Unread postAuthor: warhead052 » Sat Apr 07, 2012 10:02 pm

Haha, yeah. I suppose a decent ac to dc converter would work Gun Freak, unless you are trying to change the way the motor spins.
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Unread postAuthor: Gun Freak » Sat Apr 07, 2012 10:20 pm

Alright so if I find a battery charger with ample voltage (I'm aiming for 12) and snip the connector off and split the wires, I can connect that to my motor? I'm a total electronics noob. I found a 12V and a 9V charger but I don't wanna cut any of em up. I'm gonna keep looking around though, I'm sure I'll find a 12V charger that I don't use.
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Unread postAuthor: warhead052 » Sat Apr 07, 2012 10:22 pm

Might work, what was the original voltage for the motor?
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Unread postAuthor: Gun Freak » Sat Apr 07, 2012 10:31 pm

I don't know because the battery wasn't in the vacuum when I got it (from a trash pile) and I was stupid not to peruse the vacuum for specs. But I didn't see anything on it while ripping it apart. I am gonna try to look up the model and find out the voltage. I'm guessing it was 12, because my tests with a 9V didn't seem strong enough for a vacuum.
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Unread postAuthor: MrCrowley » Sat Apr 07, 2012 10:34 pm

Check how much current it draws as well; this will have to be equal to or less than the output current of the power supply charger.
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Unread postAuthor: Gun Freak » Sat Apr 07, 2012 10:45 pm

I know it draws a lot, because it drained a 9V in about a minute of running. I don't know if current draw will be something I can figure out but I'll try.
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Unread postAuthor: MrCrowley » Sat Apr 07, 2012 10:52 pm

A voltmeter should do it though I am surprised there's nothing on the vacuum motor itself.
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Unread postAuthor: warhead052 » Sat Apr 07, 2012 11:02 pm

A charger won't cut it. Trust me... My shitty emergency 12v compressor won't even run on a 12v charger, I even tried a 24v to see if it would boost it but nope. So try finding just a solid step down transformer, from 120 to 12v to make sure you have a steady flow of current, rather than the ridiculous drip flow of a charger.
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