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Step 2: The principle of how it works.

The trap is sprung when the rat runs over the roller which rolls the bent nail of its axle and release the arm lifting the door and the trap shuts catching ratty.

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<p>This looks great, especially since it's taking advantage of a rat's natural behavior. Would you be able to post any of the sizes, i.e. height width depth of the overall trap? We have (smaller) wood rats and (larger) tree rats here; one of the troubles I've had with other live animal traps is the mesh is generally too big for the wood rats, and they trip the trap then crawl out through the wire! </p>
<p>I figured Dr Qui wouldn't mind if I did a little 'reverse engineering' on this, so I went to a known-successful trap <a href="http://ddg.gg?q=!a+B000LNX06C" rel="nofollow"> http://ddg.gg?q=!a+B000LNX06C </a> and it is 8-1/2&quot; long x 4&quot; wide. It is 4-1/2&quot; high but from the image, I'm guessing that's for the C battery compartment, so I used 4&quot; x 4&quot; x 9&quot; as my starting point for size.</p><p>From the photos I used Sketchup to get as close as I could: looks like I could use a flat sheet of metal 9&quot; x 18&quot; and bend it into a close approximation of the shape. </p><p>Then I built one from cardboard, and encountered a couple problems. The doors don't want to slide down properly: perhaps the angle of the pivot arm is too acute? Also, the &quot;track&quot; makes the rat opening narrower than 4&quot;. </p><p>Back to Sketchup for some quick modifications and my second prototype is working better! I'll try to snip it out of sheet metal this weekend and post back some results if I'm successful.</p><p>I haven't figured out the roller mechanism yet : from the pics, I don't recognize the roller part as salvage from anything, and I haven't come up with an easy or clever way to reproduce it. Maybe a capped piece of PVC with fins glued on? I have a bin of old printer parts here but couldn't find anything suitable. Worst case: I'll try printing something at my local library on their Makerbot!</p>
I actually found this on the net! lol! I just had to try to find it on instructables. GREAT JOB! LOVE IT! :)
<p>Your daddy was one smart man. </p>
Nice work! Although I fully support the wooden version of this just to get them out the house alive. Let em' live, but if they keep comming back their dead.
Wonderful trap you have there I've never seen one like it before, simple design and it looks easy to reset. Good job on the ible and congrats to your dad for the job of building it. I hope to make one myself soon.<br>Again Nice Work;<br>Dan<br>
Thanks.
Thanks,<br> <br> He also made a Magpie trap a few years ago, Its an interesting trap.<br> <br> I need to pull it out of the garden as it has become all grown up by grass and weeds since and there are a couple of magpies that are becoming very cheeky&nbsp; I would like to get rid off.&nbsp;<br> <br> I will do a&nbsp; retro how to on it also.<br>
this closely resembles the rabbits traps i have made for myself and family ,nice work on the photos to show how to make without having to disassemble the one you've got

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Bio: Learning to live with Fibromyalgia brought on be numerous injuries some old some quite recent. Currently under no fixed agenda, just going with the flow ... More »
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