30 Amp 120v relay

[Derek Eggers]

Anybody know where I can pick up a 120v 30amp relay in Lex, hopefully during lunch break?  

Example here: http://www.veneersupplies.com/products/Vacuum-Controller-Relay-30-amp.html

--
Derek Eggers

[michael culp]

Grainger or Square D maybe?

-Michael

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[Chris Harn]

My “hardware guy” mentioned you might be able to salvage a relay like that from a home AC compressor.

 

Got any HVAC friends?

[Dave Hempy]

Grainger should have something like that. 

[Derek Eggers]

Thanks Chris,  I do have  a compressor that I salvaged from an old refrigerator.  I'll see if the relay is rated to 30 amps.  

...this is the hazard of saving everything.  When I need something there is too much stuff to dig though and I end up buying something anyway. (please don't tell my wife I just admitted this.).

-Derek

--
Derek Eggers

[Chris Harn]

My electrical experience is very layman but...

This is the vacuum system for the CNC?

30 amps is a lot... I was talking with my partner (hardware dude) he was estimating 10 amps would be enough, but not our call.

We have a 10 amp, you can have, (also a 5v which you could maybe connect to the gecko board?) http://globalsoftware-inc.com/harncw/relays.jpg

 

Here is what we do with this stuff: http://globalsoftware-inc.com/harncw/automatedloadout.jpg

 

And yeah I’m a hoarder too, my office is an EWaste dump.

 

 

From: Derek Eggers

Sent: Thursday, October 18, 2012 12:05 PM

To: coll...@googlegroups.com

Subject: Re: 30 Amp 120v relay

Thanks Chris,  I do have  a compressor that I salvaged from an old refrigerator.  I'll see if the relay is rated to 30 amps.  

...this is the hazard of saving everything.  When I need something there is too much stuff to dig though and I end up buying something anyway. (please don't tell my wife I just admitted this.).

-Derek

On Thu, Oct 18, 2012 at 11:39 AM, Chris Harn <har...@hotmail.com> wrote:

My “hardware guy” mentioned you might be able to salvage a relay like that from a home AC compressor.

 

Got any HVAC friends?

 

 

 

From: Derek Eggers

Sent: Thursday, October 18, 2012 11:32 AM

To: coll...@googlegroups.com

Subject: 30 Amp 120v relay

 

Anybody know where I can pick up a 120v 30amp relay in Lex, hopefully during lunch break?  

Example here: http://www.veneersupplies.com/products/Vacuum-Controller-Relay-30-amp.html

 

 

--
Derek Eggers

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Derek Eggers

[Dave]

--- On Thu, 10/18/12, Derek Eggers <eggers...@gmail.com> wrote:

> From: Derek Eggers <eggers...@gmail.com>
> Subject: 30 Amp 120v relay
> To: coll...@googlegroups.com
> Date: Thursday, October 18, 2012, 11:32 AM
>
> Anybody know where I can pick up a 120v 30amp relay in Lex,
> hopefully during lunch break?  Example here: 

http://www.veneersupplies.com/products/Vacuum-Controller-Relay-30-amp.html

Would Graybar, over on Fortune Court, have one?

> --
> Derek Eggers

Dave

[Dave Hempy]

I have a solid state relay rated around that much you can BORROW.  It’s committed to a project, so I’d need it back sooner or later.

 

-dave

 

 

From: coll...@googlegroups.com [mailto:coll...@googlegroups.com] On Behalf Of Derek Eggers
Sent: Thursday, October 18, 2012 12:05 PM
To: coll...@googlegroups.com
Subject: Re: 30 Amp 120v relay

 

Thanks Chris,  I do have  a compressor that I salvaged from an old refrigerator.  I'll see if the relay is rated to 30 amps.  

[Derek Eggers]

Thanks Chris.  

This is for a Vacuum Reservoir that I'm building to do Vacuum Bagging for the sailboat hull core repair (and other fiberglass projects).  ....and possibly, if all goes well Vacuum Infusion.  I took a little Vacuum Infusion training class in Louisville a few weeks back and learned enough to decide not to try it for the first time on my sailboat repair.  If the process fails I'd rather have it fail on a small part.  I want to get the rig setup -- to run a part sometime later this winter. 

I also have collected parts to setup vacuum clamping which we could use on the CNC machine.  My wife would be thrilled if I left my vacuum rig at the Collexion.   

I do have a 12 Amp relay, but since the directions called for a 30Amp I thought I'd go with it.  It depends on the starting amperage for the vacuum pump I'm using.  I have a relatively small 1/6 hp vac pump (harbor freight), so I doubt it will pull anything close to 30 amps.  ....but then (as a backup vac supply) I'm also leaving space to hook up my compressor which would run through a venturi to draw a vacuum.  This might draw more amperage than the little vacuum pump I have and thus I figured going with 30 amp rating might be a good choice.

I'll send pictures later if you're interested.  Thank you, and your hardware guy, for looking for parts and offering to let me borrow them. 

-Derek 

--
Derek Eggers

[Derek Eggers]

Michael,

Thanks.  Grainger has what I need.  

-Derek

--
Derek Eggers

[Dave]

--- On Thu, 10/18/12, Derek Eggers <eggers...@gmail.com> wrote:

> From: Derek Eggers <eggers...@gmail.com>
> Subject: Re: 30 Amp 120v relay

> To: coll...@googlegroups.com
> Date: Thursday, October 18, 2012, 12:32 PM
>
> Thanks Chris.  
>
> This is for a Vacuum Reservoir that I'm building to do
> Vacuum Bagging for the sailboat hull core repair (and other
> fiberglass projects).  ....and possibly, if all goes well
> Vacuum Infusion.  I took a little Vacuum Infusion training class
> in Louisville a few weeks back and learned enough to decide not
> to try it for the first time on my sailboat repair.  If the process
> fails I'd rather have it fail on a small part.  I want to get the
> rig setup -- to run a part sometime later this winter. 

Hmm, toss in a diffusion pump, and a decent torch, and people could
start making their own vacuum tubes [1]. Hmm, might need an oven,
too.

[1] Are any of y'all old enough to remember when Dr. Todd
had his CRT production/rebuild facility down in the southern part
of Lexington? Are any of y'all old enough to even remember who
Dr. Todd is?

> I also have collected parts to setup vacuum clamping which we could
> use on the CNC machine.  My wife would be thrilled if I left my
> vacuum rig at the Collexion.   

Hmm, might be dangerous. No telling what might get vacuumed. ;-)

> I do have a 12 Amp relay, but since the directions called for a
> 30Amp I thought I'd go with it.  It depends on the starting amperage
> for the vacuum pump I'm using.  I have a relatively small 1/6 hp
> vac pump (harbor freight), so I doubt it will pull anything close
> to 30 amps.  

Most of those are powered by induction motors, and induction motors
can pull a rather incredible current when starting (or in a locked
rotor condition). 30 Amps might be a bit much, even considering the
starting surge, though, for a 1/6th horsepower motor. You could
probably measure the DC resistance of the motor, and then divide
117 Volts by that for a truly worst case number. In reality, it
would be even less, since there's certainly some leakage inductance
that would serve to limit the AC current flow somewhat, even with a
locked rotor/stalled condition.

> ....but then (as a backup vac supply) I'm also leaving space to
> hook up my compressor which would run through a venturi to draw
> a vacuum.  This might draw more amperage than the little vacuum pump
> I have and thus I figured going with 30 amp rating might be a good
> choice.

Have any of y'all played with a Vortex Tube? Those things are wild!

http://en.wikipedia.org/wiki/Vortex_tube

You put compressed air into a port, and hot air comes out one
side, and cold air comes out the other side. Yeah, they're kind of
loud, but they produce some pretty hot and pretty cold air, with
no moving mechanical parts at all.

> I'll send pictures later if you're interested.  Thank you, and your
> hardware guy, for looking for parts and offering to let me borrow
> them. 

Parts is parts?

> -Derek 

Dave

[David Hempy]

Cool!  I'd really like to see that in action, Derek.  This month's Make has me thinking about building a vacuum forming table. 

And, I've got some trailer rash on my Hobie that needs some fiberglass work.  Not that a little repair needs vacuum bagging...but you've reminded me that fix is "on my list".  The good thing is that it seems to sail just fine with 100 mph tape!  ;-)

-dave