Rubber Band Car

Induku Wooden Models, New Item, Shop Stuff

For a long time I wanted to make automata with some kind of self driven mechanism. This car is the first step in this direction. It has a working engine, driven by 2 rubber bands and comes in a kit that is only 105 x 210 x 1 cm in size. This is the standard size of a postcard. I sell these and ship them in an envelope and they make awesome Birthday cards (who would not want a rubber band driven, wind up, laser cut plywood car kit  as a gift). If you are interested in one get it here:

Buy It Here!

wind up car kit (3)

All the bits and pieces.

As with many of the things that I have been making recently, it is a laser cut model. Most of the parts are pressed out from 3 mm plywood sheets. The axles are 4 mm dowels and everything assembles quite easily. Download the instructions* here:

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*Note the hard part of developing a kit is, for me, the instruction manual. Again writing the manual took more time than developing rest of the whole kit.

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1 of 2 postcard sized part sheets.

wind up car kit (2)

All the parts removed and sorted.

A small bit of CA-glue (supper glue) is needed to ensure there is no slippage of the gears on the axles. This is in different to many models that can be assembled without glue – but to tame the 2 band power of the engine it is necessary in this model. A bit of wax on the gear teeth allows for smooth running of the mechanism.

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CA-glue needed mostly on the drive gear.

The best part of the car is the gear system. In contrast to the gears in the Strandbeest model, there is an increase in the number of rotations from the drive gear to the final gear, rather than a reduction. The reason for this is two fold:

  • First it is to allow the car to run farther than just 2 turns of the wheels. Two turns is close to the maximum that the rubber bands can be wound. With the gear ratio of 1:3 and 2 sets of gears the large wheels turn approximately 18 times making the car go 3 – 4 meters on only 2 turns of the key.
  • The second reason is to slow down the mechanism. The gear train ends with a flywheel and total gear ratio of 1:27. The moment of inertia of this small flywheel is enough to slow down the mechanism sufficiently (although the car still moves reasonably fast).
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Mechanism in action. Drive to fly wheel ratio = 1:27

I am very happy with how this model has turned out. Let me know what you think about it, or feel free to get your own (here) if you think it is awesome.

I am already busy designing a new model and are currently very exited about it. Follow me on any of the social media channels to see what it is.

R

 

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Wooden Posters

DIY, New Item

I bought Lauan plywood a while ago to use as cheap material for constructing things in the workshop (e.g. work area in spray-paint booth). Using a cut off piece to test some of the settings on the laser soon changed my view of this material. The Lauan hardwood panels engrave very well – it is uniform and it allow for a very good scale of shades from light to dark. The wood itself is also nice when sanded and treated with some lacquer or oil. I thus started to use it to make engraved posters. The size of these are 30 cm x 40 cm (11.8 in x 15.7 in) but I am thinking of making large multi-panel maps.

Some of them are for sale here: BUY A WOODEN POSTER

See more MORE IMAGES HERE.

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I also made some book covers using this wood that can be seen here.

I am currently almost out of this wood but will probably get some more in the future.

R

A selection of notebooks.

DIY, New Item

Over the past year I have made a selection of notebooks all bound with Coptic Stitching. The first book I made was with a cover that I cut on a scroll saw. I have recently started to use a laser cutter to make even more detailed cutouts. This machine is also excellent for engraving and the range of covers have extended to include some very nice and detailed engravings. Many of the books are currently for sale here: Induku on Etsy.

In the future I will also make some kits with all the items (wooden covers, needle, thread, wax, bone folder etc.) to make your own Coptic Stitched book (excluding only the paper). Without the paper the weight will be low and the shipping cost will be much much less (I may even provide free shipping). The cost of the components and absence of labor (it takes me around 2 hours to bind one book) will also mean the price for a kit will be around 1/4 of the price of a book. Follow me on Facebook to see when the kits are available.

Here is all the Coptic Stitched notebooks that I have ever made (click on any image for a larger version):

 

R


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