base para time laps

7/28/2019 Base Para Time Laps

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TAKE TOMBO


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Use this sheet to control the accuracy ofyour printer the square is 7/7 or 177.8mm/177.8 mm. The difference should not begreater than 0.7 mm (0.0276) in any di-rection. If the difference is equal inboth directions you can still use yourprinter it just means the Take Tombo willbe slightly bigger or smaller


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You can directly meas-

ure the axle length fromthe drawing, note that theholes are 1mm deeper oneach side. The holesshould be wide enough toallow the axles to turneasily without too muchplay, if they are a bittight sand the ends of the

axles until you get aloose fit.


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Make the propellerfrom 6mm (1/4) plywood.

To give the propellerlift form the blades asshown, I use an angel

grinder with a sandingdisc, which makes a lot ofdust but is very quick.The 2 holding holes shouldbe loose enough to allowthe propeller to lift off.


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TAKE TOMBO

INTRODUCTION

The Take Tombo is an old Japanese toy, and means bam-boo dragonfly. Traditionally they are made entirely frombamboo and stuck on a thin stick , which is clasped be-tween both open palms and when the right hand is movedsharply back this causes the propeller to turn and whenreleased will take off.

I have designed this project to be fun, and easy to

build. But principally to show how easy it is to makecogs, if you can make this project you can make a clock.

http://www.woodentimes.com/

A WORD OF CAUTION

Please be aware that when the propeller launches youcan not always predict its path, and should be used with

caution. The propeller turns very fast and can causedamage to persons or objects on contact. I can and willnot take any responsibility for damages caused becauseof miss use.

LEGAL NOTICE

You may copy and distribute these plans as often andin what ever form you wish. You may not use either the

plans or the end product for commercial profit, or alterthem in any way.
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TAKE TOMBO

MATERIALS

The plans are drawn in metric, but obviously beingfull scale can also be measured in imperial. If you useimperial plywood you will have to make adjustments toallow for the difference in thickness. The plywood usedis Baltic birch throughout, which is a good quality ply-wood, and should be used for the cogs, for frame andgrip you could use solid wood. For the axles use a hard-wood dowel. The plywood amounts are approximate and do

not allow for any miss cut cogs or parts.

You will also need screws and a wood glue

Material Metric Imperial

Plywood (cogs andspacers)

6 mm

20cm/40cm

1/4

8/16

Plywood (propeller) 6mm2.5cm/18cm

1/4

1/7

Plywood (pinions andspacers)

9 mm10cm/10cm

3/84/4

Plywood (frame) 12 mm20cm/30cm

1/2

8/12

Axles 6mm25 cm

1/410


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TAKE TOMBO

CUTTING THE COGS

Use a low tack spray adhesive to attach the desiredpart to the plywood, if you have a narrow band sandercut over the lines and sand down to line middle. Be asaccurate as possible. You could leave the big cogs solidas the spokes are purely decorative.

ASSEMBLY

Before you glue anything, first do a dry run to make

sure everything runs smoothly without any notable resis-tance. One common problem is binding, this is when atooth or teeth mesh so tightly that the cog can notturn, mark the tooth and sand accordingly, also pay at-tention to the axles, you should have a small amount ofaxial movement and they should turn freely.

LAUNCHING PAD

The 2 holding pins can be made of anymetal rod you have, I have used 3mmbrass rod, you could however use a nailor similar. The propeller holes shouldbe slightly bigger than the rod diame-ter used.


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TAKE TOMBO

HOW TO USE

Make sure you have plenty of room, preferably out-doors. Angle the Take Tombo so that it is pointing awayfrom you, grip the dowel handle between thumb and indexfinger and pull backwards with enough force to launchthe propeller. With practice you can get it to fly 10m(32 ft) wide or if held straight 4m (13 ft) high. I ex-perimented with several propellers but got the best re-sults from the one here, but if you can beat my dis-

tances with a better propeller I would like to know.

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