Third Hand++: A multi-use helping hand for electronics and other delicate work.

In the past I've used the third hands/helping hands available at chain electronics shops and have been frustrated with their usability. I could never get the clips exactly where I wanted them or it took more time than it really should to get setup right. I also wanted the ability to hold small circuit boards and alligator clips just don't do a very good job.

I was familiar with the adjustable coolant hose systems used to spray coolant at cutting tools in the machining industry and thought that would be a great place to start. I ordered various nozzles and hose segments from my favorite online machine tool supply company and started experimenting. This is what I came up with. While it still has plenty of room for improvement it has served me well over the last 3-4 years.

These arms can be placed into pretty much any position and they will stay there.

Another nice feature is that you can make all sorts of attachments for holding whatever you need to work on. So far I've made a circuit board holder, a clamp, a mount for an LCD, and an extraction fan for keeping fumes out of your face.

All you really need are some simple hand tools, a couple taps, a drill bit and a drill to make the basic version. If you have all the tools you need, it can be made for $20 or less.

Step 1 Getting Started

The first step is to gather everything you'll need.

Tools:
- Drill (A hand drill will work but a drill press would be better.)
- 3/8" drill bit
- 1/8-27 NPT tap
- 6-32 Tap
- A tap handle
- Ruler
- Center punch

Don't forget safety glasses!

Parts:
- The Base:
I used a block of 1/2" thick aluminum (5.75"x2.5"x0.5"). Aluminum is heavy enough to be stable and is easily tapped. You can use whatever you want as long as it is at least a 1/2" thick and can be tapped. (Plastic, wood, MDF, steel, etc...) The lighter the material, the larger the base needs to be in order to remain stable. If the material is too soft the threads will wear out and the arms won't stay in. If you don't have a local source for the aluminum you can order it from an online metal sales company cut to length for about $6 plus shipping. I have used www.onlinemetals.com for other projects in the past.

- The arms:
The arms are made from coolant hoses and nozzles used in the machining industry to keep cutting tools cool and lubricated. I used the Snap Flow brand coolant hose system which I bought from www.use-enco.com. They sell a "Male NPT Hose Kit" that has 13" of hose and an assortment of nozzles and connectors. That gets you most of what you need to make a two handed Third Hand. I'd recommend buying two kits and a few extra nozzles and connectors. For around $12 you will have more than enough parts to make 4 arms.
For each arm you will need:
- One 1/8 NPT connector
- 4-5" of hose
- One 1/8" 90 degree nozzle.
You may want to consider buying the hose assembly pliers for $23. They are a little difficult to snap together by hand. I didn't buy the pliers but I kind of wish I had.

- The Hands:
Each hand is made out of a banana plug threaded into the 90 degree nozzle and an alligator clip. I chose the "Flexible Banana plugs (2-Pack)" from radio shack because it has 6-32 threads that will thread into the nozzle. The alligator clips are the standard 2" size.

Comments

[jwmallett]

I saw this instructable a few months back and acquired most of the parts. Thank you for this instructable and others who have taken the time to post their ideas. I was deciding on which type of platform to get. In the meantime, I saw this portable work vise. I paid 30 bucks for it with shipping on ebay. Most of them are a few dollars more, maybe expect to pay 40-50 with shipping. Little did I know when I purchased it, I found out that you can tap the brackets that hold the boards and the coolant hose screws into it securely. I saw a post on here about an addition of a Irwin quick grip, I think this one is a micro or mini. I was going to get around to tapping the other three, but after using this, I have abandoned getting a platform and building a table version. This thing rocks! I can fit the tiniest DIY boards snugly in the vise and quickly adjust it to secure and area. This is extremely useful for getting to both side of a circuit board, and the table is heavy enough that I can apply enough pressure to effectively pull components, etc. Plus this thing can be used for all sorts of things. Keep the ideas flowing!

[jwmallett]

BTW, the tap I used was a 3/8-24 found on ebay. Also I want to note that, there is a hole in the hardened rod that the blue plastic mold goes through, its about a quarter inch in diamter. I think I used a 3/16 bit and just happen to hit it! on the back side I drilled a 3/8 hole, if i remember correctly and was able to force fit the attaching peice. I put a machine screw in from the back side ( i think it was #10 or #12), sorry it has been a month or so, I cant remember, but it was bigger than the hole in the straight nozzle. Fit through the hole that was machined from the factory. Then I added some epoxy for good measure on the inside of the nozzle. then trimmed the screw and added an acorn nut and washer and tightened it up. Works like a charm!

[jwmallett]

[quaeredeo]

Please would someone make one and let me buy it from you. What would you charge to make one for me? [e-mail]

[Schliermaaker]

Take a look at;

http://www.exltek.com

http://www.exltek.com/Products/Lookup.aspx?ItemNumber=Clip_Sticks_14

[foxmcf]

I searched over and over again for the 'perfect' soldering station. This is definitely it. I ordered my hose kit from enco on Monday, and they arrived today. Thank you for the great instructable! I also ordered a couple of these magnetic vise grips, and together your possibilities on soldering configuraitons are endless.

Here is a link. If the link stops working, search google for "Napa 77-4025 Magnetic Soldering Clamp Vise"
http://www.ebay.com/itm/Napa-77-4025-Magnetic-Soldering-Clamp-Vise-/250933642527?pt=LH_DefaultDomain_0&hash=item3a6ccf851f

[Boaticus]

Great instructable! I made the 4-armed part tray version. Also added a sheet of 1/16th thickness neoprene rubber to the bottom for more traction and less scuffs on the work bench.

[bwdidwhat]

You did an amazing job on that. Just saying.

[zeremy]

i really have to have one of those trays

[stagebuilder]

It's usually better to just drill through metal with the size bit you want rather than using a "pilot" bit like drilling in wood. It will cause your larger bits to wear unevenly. So just use the size you wish and go slowly, gearing down the drill press if you can, and releasing every now and then rather than forcing straight through. Also, you should always use a lubricant when drilling any metal. This will also save your drill bits.

[rstraugh]

Cool, thanks for the pointer. I've wondered about that. Often I'm using a hand drill and find it too difficult to drill all the way through in one pass with large bits. But, I can see how that would wear out the outside of a bit faster.

[qualia]

conversely, if a straight hole without the drill wandering is the objective, or when going through hard materials, like annealed tool-steel (hardened tool steel drilling = fail) , sometimes it is good to drill a pilot hole and go up in bit sizes till you've got the hole size you're after. dont try go in drill bit steps of more than 2mm larger than the last, or it will srsly rip up the tip.

[johnpeck1]

I drill metals all the time. I use a small pilot hole, 1/8. Then finish it with the proper bit. This makes a clean hole and saves your bigger bits point. Makes a perfect hole every time.

[mildsteel]

good idea, but be careful when doing these things because some equipment are hot on working times.

http://www.metal-supplies.com/12201/index.html

[hi111]

 Could you please give links to the exact things you used?
Tanks in advance!

[nbagf]

male npt hose kit 
right angle 4 pcs kit 
1/8-27 NPT tap
6-32 tap


hows that for a part list ($25.49 without tax or shipping costs)

[natter37]

is that actually called "Coolant Hoses"? cos when i try and find it it only comes up with hoses :/ is there another name for it?

[superjail3]

 couldnt the base be wood otherwise great instructable

[ZeroTruths]

Yes, but then you'd need to find a way to add more weight so that it wouldn't tip over as easily.

[TheGreatS]

Or you just make a bigger base.

[slithytove2]

I have been browsing some of the loc-line products (officially retailed at http://modularhose.com/) and had a few ideas:

They sell a magnetic base (though for the 3/4" system, item 60532) (just need to get the converter to go from 3/4" to 1/4" or 1/2" if you want a smaller one)
Using two of the Y-Fittings (item 41408) you could get 3 arms, with one set apart from the other 2 (this would actually allow greater range of motion that the fixed base)
Alternately you could use a solid 4-way cross (item 41498)

While coming to a bit higher price than above (about $35, $13 of which for the magnetic base, which could be built for cheaper), it would create a more modular and flexible system.

[steel plate]

http://www.ysteelplate.com

[wjulaxer13]

what would be considered the max temps that this hose will handle? I would like to make this to handle braising temps which are quite a bit higher than standard soldering. thank you

[maurice1993]

I wann one just like the last one, with 4 hands, how much? =]

[techturtle2]

I have that same soldering iron. be careful with it it gets WAY to hot! :)

[joerice01]

 What are you using to filter on the back of the solder fan?

[ngenius]

What machine was used to mill the parts trays into the aluminum?

[u_r_teh_svck]

its called a milling machine

[112251919112]

Have you ever that of marketing this?

[urbanwoodswalker]

Ok, I definately need these...I am in the USA....anyone figure out how to make one with US materials?  Or, a link to getting the hoses here?

[planetscape]

I am in the USA, and purchased my NPT hose materials from the link listed above: http://www.use-enco.com/.

[planetscape]

I would definitely recommend purchasing the pliers as well as the NPT hose kits - not only do they make it much easier to assemble the hoses, connectors, etc., but also to disassemble them, and you may want to do that if you buy one of the kits and want to shorten an 'arm', as the kit lengths are a default 10 units.

[punkhead58]

An easy solution to this is simply clothes hanger wire.

[SpiroExDeus]

For those in the UK (like me) Tilgear www.tilgear.info are a good distributor for the loc-line stuff (just type loc-line into their search box) - you CAN get them through the US site mentioned here but international buyers have to jump through quite a few hoops first.

instead of using www.onlinemetals.com, UK buyers can use Metals on the web www.metalsontheweb.co.uk. This will DEFINITELY be cheaper than the US option as metal is so heavy the postage costs from the US would be phenomenal (especially since the USPS don't do surface mail any more - I miss surface mail. It took ages but it was SO much cheaper).

[Cabbages and Kings]

Cheers! A very helpful comment. Thanks.

[bikeNomad]

Using the same clamp, I figured out an easier way to attach it to the LocLine. I used a straight nozzle, and drilled out the clamp hole using a 5/64" bit so I could pass a #6 screw through it. Then I put a nylon spacer over the screw, and used a regular nut inside the nozzle to hold the whole thing together. You will see a bit of distortion due to screwing it together tightly, but it holds quite well.

[bikeNomad]

I used 0.040" stainless aircraft safety wire around the barrels.

[bikeNomad]

like this:

[bikeNomad]

I had the same banana plugs, but the only nozzles I had on hand were larger than the screws. So I filled the ends with epoxy putty and then put the banana plug screws into the epoxy putty and let it harden.

[bikeNomad]

Another way to do this would be to make a stack of thinner material: three pieces laminated or bolted together. This would be easier for people without mills to produce.