Automatic Switch


Pbmaster11

Recommended Posts

Wow! Such negativity! I am no engineer. I cannot with specificity draw up the plans for this. I have the basic concept. I would need to research some specs. But, I would not nay-say your capabilities just because you are asking here. All you need is a plan to follow and maybe some skill at electrical soldering. This cannot be difficult. Motorcycles have voltage sensing switches that ground excess generator power. The only question is how to assemble that switch. The box itself will be easy peasy.

Link to comment
Share on other sites

Im not sure what your trying to make or what you want to control. If you go over to phenix controls web site you can buy all the current sensing relays you need to control your entire shop based on whatever tool you happen to have running. For a single shop vac I doubt its worth the effort but if you for example wanted your dust collector to fire up with your table saw that is easy and inexpensive.

Link to comment
Share on other sites

Basically control a tool and have the vac turn on... exactly what the above link does... just how my brain works. how can I make that. whether it is cheaper or more expensive I am trying to see if it is possible..

 

I get it but I doubt you can beat those prices just because they buy so many parts in bulk. If you want something more elaborate check out phenix his stuff is great as is the service.

Link to comment
Share on other sites

Yes you can build one but there are lot of things to consider. Too many wood workers have fires every year from sparks in the dust bin, oily rags, soldering coper air lines with a torch and the list goes on. No need to build a $30 switch if you don't have the skils. I was a licensed electrician and when it came time to control my ClearVue cyclone I used all coper wire, all the correct gauge, a relay ( contactor actually) the correct contacts and I built it in a NEMA enclosure. The relay was 18VAC so I could run doorbell wire to all the blast gates. Even with all this planning, I put a switch on the bell transformer circuit so I could shut off power to the relay when I closed the shop for the night. Just in case a micro switch failed or some other anomaly, I didn't want stuff going on when I wasn't there.

In my opinion, You and your shop are important and not worth the risk.

BRuce

Link to comment
Share on other sites

Craftsman makes the same thing in a 4 outlet version...I think I paid about 12 bucks for it.  At that price you have to be a crazy person to invest even ten minutes into trying to make your own. :)   I tried gargling it but couldn't find it...I'm sure they're still out there if you look hard enough.

Link to comment
Share on other sites

Even electrical engineers with a full set of tools and supplies buy these pre-made rather than building them.  But, if you want to build rather than buy for the experience, and you are willing to spend more for the satisfaction of making it yourself, then I think you need to ask The Electron Whisperer rather than The Wood Whisperer.

Link to comment
Share on other sites

HELLO!!  We are all woodworkers here!  Think of all the times we have been told it would be cheaper/better/safer to buy something that we are building?  Sometimes its not about saving money, but rather trying and learning something new.  Using common sense and using old equipment to test with, I see no reason why PBMaster cannot give this a try. Yeah, he may blow up a piece of equipment, or get some sparks shooting, but he will also have learned what not to do.

Link to comment
Share on other sites

PB - kudos for trying it out. Just be careful with it (as you always should with electricity). I would think the component costs would add up but I guess you won't know till you come up with a plan and do the shopping. I'm wondering why you'd want 6 or 7 of them. The usual set up is for a shop vac to turn on when another tool is turned on. What are you planning?

Link to comment
Share on other sites

I use one of these -  http://www.woodcraft.com/Product/2005117/8394/WoodRiver-110-Volt-Dust-Collector-Remote-Control-Switch.aspx   BUT it was less than $50 when I bought it about 8 years ago and before Woodcraft put their house brand name on it.  Works great and I keep the button fob attached to my belt when in the shop.

Link to comment
Share on other sites

 

   I have seen other systems where you can use a remote control (looks like an car alarm key fab) to start a tool remotely, for me that would be a better option. 

 

This is what I use as my DC is in my garage away from my shop and they work well!

Link to comment
Share on other sites

I think folks way over complicate these things. Tool vac switches are cheap and you will never build one cheaper than you can buy it unless your stealing the parts. Some people wire their blast gates to the DC but that destroys the motor with frequent on and off cycles. Our new shop has to be wired so that when any stationary power tool is running the dust collector will start this is mandated by code. The same goes for spray booths the exhaust fan must be on before air is supplied to the dispensing system. A simple current sensor switch inside the panel is really all it takes. Any time there is ample current draw the switch is closed activating a relay. The sensors are cheap and simply slide over the wire and require no connection to the line. We have ours set up to where any 10a draw will power the the DC system and the draw from the DC holds the draw until its shut down manually at break times or end of work day. For a sander vac system its very easy to install a sensor inside a normal wall box with the outlets and as long the vac is plugged in down stream of the sensor it will turn on and off with the sanders. A small vac like a shop vac does not even require a relay you simply connect the vac outlet to the sensors built in switch. None of this is complicated, expensive or dangerous. If you can install a light switch you can easily set up these sort of systems. Our DC system cost less than $50 to set up and took all of about 10 minutes. There is no need to mess with stringing low voltage systems all over your shop to fail down the road. 

 

 

 

  • Like 1
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Who's Online   1 Member, 0 Anonymous, 51 Guests (See full list)

  • Forum Statistics

    31.2k
    Total Topics
    422.1k
    Total Posts
  • Member Statistics

    23,776
    Total Members
    3,644
    Most Online
    RiadhWooder
    Newest Member
    RiadhWooder
    Joined