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This Instructable was inspired by member CobyUnger'sManual Chainsaw. He did a great job creating a versatile tool that fits right in your pocket. My only hesitation with creating his version is that I tend to abuse my tools and I had concerns that the fabric strap would become frayed and fall apart over time. So I modified the design a bit to put on some pipe handles.

Step 1: Materials and Tools

Materials you will need:

(1x) chainsaw blade. I think the one I used was around 30" long

(2x) 3/4" pipe caps

(2x) 3/4" pipe nipple, 5" long

A small amount of concrete mix

Some water (for the concrete)

Electrical tape

Tools you will need:

Metal grinder with a cutting wheel

Small hand file

Rubber Mallet

Vise

Tape measure / ruler

Several clamps, although not necessary, definitely helpful

Mixing container

Paint stick / Mixing stick

Leather work gloves

Step 2: Cut the Chain

The first thing I did was cut the chain using the grinder and a cutting blade. The grinder made quick work of the blade. I simply clamped the chain to a board, and came in from above between the links. If you don't have a grinder, I'm sure this could also be accomplished with a hacksaw.

Step 3: Grind the Pipe Caps

The next step was to make a slot in the pipe caps to allow the saw blade to be fed through. I clamped the pipe caps tightly in a vise and slowly cut a slot through the cap. I then cleaned out the slot with a file.

This would be a tough job without a grinder. If you are able to get through those caps with a hacksaw, then more power to you.

Step 4: Feed the Blade Through

Screw the caps onto the end of the nipples to create two handles.

Then feed each end of the chain through the slots into the handle. Keep feeding chain through until you have about 5" of chain coming out of the back end of the handles.

Finally, wrap tape around the blade between the 1/2" and 1 1/2" mark. Keep wrapping tape until it builds up and barely fits into the pipe.

Step 5: Pull the Tape In

After you've wrapped the tape around the blade, pull the blade (wearing gloves of course) so that the tape is pulled into the handle. Keep pulling until you can see the tape peaking through the slot.

The objective is to have the tape create a seal against the pipe cap once it is pulled into place.

Step 6: Mix and Pour the Concrete

To hold the blades in the handles, I used premixed Quikcrete Concrete mix. The stuff came with a lot of larger aggregate mixed in. The mix needs to be fine enough to be poured into the pipes, so I sifted it through my fingers until the bigger chunks were removed.

I have no idea what the water/concrete ratio was. There was so little concrete being used that I didn't bother calculating it. I just mixed it into a slurry that was manageable. Use a paint stick to mix the concrete into a smooth milk-shake consistency.

Right before scooping the concrete in, I sprayed the interior of the pipe with WD-40. In my mind, this provides some additional protection from the blades becoming rusty while the water evaporated out of the concrete. Does it actually make a difference? Got me.

Use the paint stick to scoop the concrete into the back of the pipe. The concrete tends to get gooped-up near the opening. Knock the pipes with a rubber mallet will allow the concrete to work down.

Step 7: Let It Dry

You will want to let the saw sit for a few days so that the concrete has enough time to set. I found that it took a while for the concrete to completely dry (I think I left it for 5 days or so). I used a couple clamps as stands so the wet concrete wouldn't spill out.

Step 8: Possible Improvements

This guy can boogie through branches pretty well. I plan to add a 90-degree elbow and another 5" nipple to each handle, so that the handles are L-shaped. I think this will make the ergonomics of this saw much better

Since posting this Instructable, several members have thought of clever improvements:

Member bjkayani suggested adding a T to the end of the handle, so that two people could operate the saw, one on each end.

<p>Sorry but I fail to understand: has this tool actually a practical value or is it just a curiosity?</p><p>I've had my share of wood cutting with all sorts of tools and situations, not the least with real chainsaws. but a manual chainsaw? It can't be anywhere near effective at the sort of cutting speed one can produce manually, and then without guidance of a blade? </p><p>There's wire saws, flexible blades, but a manual chainsaw?</p><p>Maybe I still have something to learn here, but yea, I believe desertsniper's comment &quot;craziest nunchucks&quot; just about sums it up...</p>
<p>This item is MORE of a survival tool <strong><em>and/or </em></strong>a tool to cut small dead trees and shrubs [less than 4-6 inches in diameter] to use for gathering firewood while camping or just making a clearing. Besides it is environmentally much better than using a gasoline powered chain saw to do the same simple task. It fits nicely in a backpack taking up very little space. If the user does come across a standing tree trunk, then it can be used for making nice slices for arts &amp; craft projects {coasters for glasses, stool seats, &amp; table tops}. There are inexpensive commercial ones available for $20.00 or less for retailers like Amazon or Tmart that should be in every camper's, hiker's, &amp; hunter's backpack. It is much EASIER to use a manual chain saw to reduce a 12 foot long 4 inch diameter tree or branch into 18 inch long pieces of wood for a fire than to try breaking up a 12 foot long 4 inch diameter tree or branch into the necessary sized pieces.</p><p>Rule of Thumb:</p><p>Length of chain &times; &frac14; = Ideal diameter of object to be sawed</p>
<p>i agree,</p><p>unfortunately I have to say that this is the most stupid tool I have seen, that isnt even a good art piece. If you want a portable cutting tool, you would use small hand saw. Chainsaw blades are designed for high speed cutting and material removal, while supported by a chain bar. Withou the chain bar, chainsaw chains are useless. Handsaw blades are designed for manual low speed material removal.</p><p>I can only imagine that whoever made this, only made it, to put on the web to see all the clueless people who would praise the idea.</p>
I have no idea why you have such a strong negative reaction to this. I've used it and found it helpful to have. It obviously can't compete with the speed of a powered saw, but for those that only want a fraction of the power for a fraction of the cost, then it makes perfect sense. It's not like I'm suggesting that you should throw out your gas powered tools. Way to be a miserable downer bud
<p>I wouldn't call that a &quot;strong reaction&quot;. People, including myself, are just wondering about the usefulness of such a tool. Because the design of a saw chain is for high speed guided cutting and none of this is the case with manual use. I'm sure your design will work, but it can't be effective and neither can it be a match for manual saws. So I too, wonder why somebody woud spend so much effort on making a tool like this, unless it is for curiosity. If you are looking for pocket tool for cutting wood I'd recomment this kind: <iframe allowfullscreen="" frameborder="0" height="281" src="//www.youtube.com/embed/GQggUkTiiRs" width="500"></iframe></p>
<p>http://www.wired.com/2007/07/hand-powered-ch/</p>
<p>Nice Idea ! I can see that if you were doing a lot of tree trimming ( like it was your job or something ) , or you were gathering a winters worth of firewood , then I agree with gungajin that a real chainsaw would be more useful . But to do minor tree trimming in your yard , it appears to be very useful , or to take with you camping or something , you wouldn't need to carry a real chainsaw , along with a gas can and 2 stroke oil with you . It would fit in a bag , and for what little bit of cutting you would need to do , it would probably be less work than getting out a real chainsaw . It all depends on what you are doing !!</p><p>Cheers , take care and have a good day !!</p><p>Ray</p>
I've found it useful.
<p>At first glance I thought they were some strange nunchucks. Good 'ible</p>
<p>When it showed up in my email, my first thought was, &quot;That's a weird jump rope.&quot; Then I read the description. That would probably hurt a lot.</p>
<p>Upon reading comments, I guess I'm not the only one</p>
<p>This seems like a lot of work for something that is eventually go dull and have to be thrown away. It seems like the other design using the hand sewn webbing is less work and you can just remove the chain saw and replace it with a sharp one.</p>
<p>Sharpening a chainsaw is easy. Throwing away a chainsaw because it's dull is like throwing away a knife because it's dull. And it would take a LOT of hand sawing to dull a saw blade.</p>
<p>Chainsaw blades can be re-sharpened. </p>
Concrete doesn't need to be sloppy wet, it should be the consistency of toothpaste.<br>Also the WD-40 was unnecessary, water doesn't need to evaporate out of concrete if it is mixed properly.<br>A thicker paste (still loose enough to move in to the pipe as you tap on the walls of the pipe for vibration) doesn't evaporate, the water reacts with the lime in the cement, it never leaves the concrete.<br>The reason yours took so long to cure is because the mix was so heavily diluted.<br>The dryer the concrete mix, the stronger, and more durable it is.<br>Wetter concrete flows easily, but it takes longer to set and is weaker versus thicker mixes.<br>Any rusting that occurs during cutting will just add iron to the concrete, which makes stronger bonds.
<p>Two thumbs up!</p>
Curing, not during cutting, silly autocorrect.
One thing you could do instead of concrete, would be that resin used for securing fiberglass or plastic handles to sledge hammer heads or axes or whatever.
<p>For all you sceptics... Go on youtube and type: Survival Chainsaw and Kershaw Tension REVIEW. They actually sell this kind of thing.</p>
<p>nice idea! somewhere i had seen something similar before but never mind... i suggest using bike bar ends with an angle around 90 degrees as a grip to have the ability of using it in different positions or being with two persons cutting the wood. </p>
this kind of resembles nunchaku which are prohibited in some places, like canada. i question whether these would be legal to make where i live :/
<p>i came here just because of the thumbnail in the email i recieved, i thought &quot;cool, some sort of sadistic ninja fantasy weapon ;)&quot; lol , anyway i have my doubt that it has no practical application problems, since the teeths are so large its likely to get often stuck. (Since a chainsaw operates at higher speed than a human arm)</p>
<p>Good Idea ! I read through the comments , and there were some good suggestions . One thing , I saw that you sifted out the aggregate in the concrete mix . You can buy &quot; mortar mix &quot; which is basically concrete mix with just sand and not all of the stones , it is used for laying bricks or concrete blocks . </p><p>A little humor here . Concrete mix sounds like a crime . It is &quot; aggregated mortar &quot; !</p><p>Cheers ! take care , and have a good day !!</p><p>Ray</p>
<p>Some one, some where in the US is going to search the internet for &quot;Pipes&quot;, &quot;Pipe ends&quot; and &quot;Chainsaw chain&quot; 10 minutes after their spouse buys a pressure cooker and have Homeland Security bust in their doors. </p>
<p>lol</p>
<p>мне кажется в ручную резать этой цепью это есть трудно!!</p>
<p>exactly</p>
<p>caziest nunchucks ever!</p>
<p>might I suggest drilling a hole through each handle near the bottoms so that if you had to cut a branch that was higher up than you can reach, you could attach ropes to the handles to lengthen them? I bet with the weight of the concrete in the handles its easy to throw them up and over your target limb. Good job! </p>
<p>That is a great idea. You could weight the end of a rope, throw it over a branch and hoist the blade up from the ground. Then cut the branch from ground level. Really genius. Mind if I add that to the 'improvements' step?</p>
Not at all... post it how ever you choose! thanks for asking.
<p>oh, cool,,, I thought that it was jump rope,, </p>
<p>Super! Thank you! Отличное решение!</p>
<p>Это интересно а как это на самом деле режет?</p>
<p>Yes, it will cut, but it is a bit of exercise. I cut a fallen branch 3 to 4 inches in diameter without too much trouble. </p>
This is a great idea! I made one of these too but mine just has leather for a handle. I will be updating to this very soon
<p>Great idea-I would like to put a pair of bicycle handle grips on the pipe for a better grip.</p>
<p>One of the strongest resin fills would be resin used for chemical fixings (metal studs glued into concrete where expansion anchors would burst the concrete) - Fischer do a nice two part cartridge which has the advantage of no mixing and a nice long nozzle to get right down to the bottom - strong enough for industrial handrails.</p><p>Might come in handy as a chain wrench as well.</p>
How about using pvc and hydraulic cement? It would help save weight and time. Or possibly an epoxy in place of the concrete?
<p>PVA?</p>
<p>I've had that big bag of concrete mix laying around for a year, so I used that rather than buying epoxy. But epoxy definitely would have been a lighter alternative. My fear is that the concrete will prove to be too brittle and will chip out over time. An epoxy fill would probably be better suited to this type of application</p>
<p>Cotter pin. I now have a use for old saw blade. Probably a little different construction but I have unreachable limbs to remove.</p>
<p>Great job! How about modifying it so you can attach lines to heave a weighted line over a high branch and use. Should only have to drill holes in the ends of the pipes to tie the lines to and make a weighted ball to attach to a heaving line. Attach a plain line to the other handle. Heave the ball over a limb, pull it up till the blade is on the limb, grab both lines and start cutting. </p>
<p>Fill it with epoxy or jbweld.</p><p>You could even use lead free Body Solder.</p>
My first thought was &quot;awesome nunchucks&quot; ;-)
Zombie nunchucks!
<p>This is pretty cool, I like how the tape cushions the movement to preserve the concrete. Might have to do this, but one change I think I'd make is using the center hole of a tee and a shorter nipple, then a couple close nipples and caps for the ends. Much easier on the wrists. That would probably double the price though. There's always a trade-off.</p>
<p>Greetings, Seems to me that an ever easier way to secure the chain would be like a carter pin or some sort of wire rather than concrete or bonding agent. A carter pin or wire is easily removable and the blade is easily replaced where as concrete seem permanent. Just my idea as an alternate to what's listed here...</p>
Hydraulic would be my second choice, for one it remains more pliable then concrete or mortar but epoxy would be my first choice, but at least you used up some concrete mix before it got hard. Using WD40 did exactly opposite of what you wanted. I'm an old concrete guy and before the days of the EPA, after we did the final finish on the concrete, we would spray it with diesel, to keep it from drying out too fast, which also helps the concrete's strength. So the pipe and WD40 is like spraying the concrete with diesel then covering it with plastic. You had a good thought where most people won't even try to think out of the box. Also before anything corrodes, your blade will be wore out, so no worries.
<p>NICE</p>

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