Opitec 104.689 Manuale utente

E104689#1

104.689

Thermo See-saw

Important Notice:

Beware of fire, never leave a

burning candle unattended!!

Warning!

This product contains small parts that can be swallowed

There is a danger of choking

Please Note

The OPITEC range of projects is not inten-

ded as play toys for young children.They are

teaching aids for young people learning the

skills of Craft, Design and Technolo- gy.

These projects should only be undertaken

and tested with the guidance of a fully qua-

lified adult. The finished projects are not sui-

table to give to children under 3 years old.

Some parts can be swallowed. Dan- ger of

suffocation!

1. Product Information:

Article: Mechanical toy in project pack form

Use: In Design Technology, Key stage 3

2. Material Information:

2.1 Material: Pine (Coniferous) softwood

Beech (Deciduous) hardwood

Wood should be relatively dry before working

Working: All wood can be planed, sawn ,drilled shaped and sanded

Mark out according to the plans or use patterns

Joining: Glue and wood joints

Finish: Wax (liquid or solid)

Clear wood varnish

Staining (coloured, water soluble then clear varnish)

2.2 Material: Welding rod, copper coated steel

Working: Bending

Joining: Screws and push joints

Finish: No special finish necessary

2.3 Material: Modelling felt

Pressed wool fibres, dyed

Working: Cutting with scissors

Joining: Gluing

3. Tools

Saws: Use a Fret saw for all round shapes and curves that cannot be sawn with a

normal Tenon saw

Note! Fret saw blades should be inserted with the teeth facing forward

Use a special Fret sawing board, hold the work down and saw with

slow constant strokes, turning the work as you go

Use a Dovetail or Tenon type saw for all straight cuts

Note! When sawing, hold the work in a vice or use a bench hook

Filing: Use the correct grade of wood rasp or file according to the work in hand

Note! Rasps and files only cut on the forward stroke!

Sanding: Use a block and glasspaper for all flat surfaces and loose sheet for curves and

individual shapes

Drilling: Use a hand drill or machine drill stand

Note! Adhere to the safety rules when drilling , tie all long hair back,

remove rings and jewellery, wear safety glasses and an apron

Cutting: Use scissors

Note! Scissors have sharp edges and can cause injury!

Gluing: Do not apply glue too thickly

Read any instructions before use

2E104689#1

E104689#1

4. Parts List

Part Material Quantity Diagram / Part N° Size

Base Pine 1 10 x 100 x 200 mm

Seesaw

Pine strip 1 10 x 10 x 200 mm

Pine strip 1 5 x 10 x 300 mm

Beech dowel 1 ø 3 x 150 mm

Mechanism

Welding rod 1 ø 2 x 250 mm

Welding rod 1 ø 1 x 200 mm

Bimetal spring/coil 1

Wooden ball 1 ø 20 mm

Washer 1 3,2 mm

Connector 1

Tea light 1

Figures

Wooden ball 2 ø 15 mm

Wooden ball 4 ø 10 mm

Pipe cleaner, brown 1 500 mm

Felt, oloured 1 100 x 150 mm

5. Exploded diagram

6. Designing and making

6.1 Designing and making the see-saw

6.2 Making the mechanism

6.3 Designing and making the figures

6.4 Finishing and testing

D105434#1

Scale 1 : 2

14a

14b

14a

14b

2 12

6.1 Designing and making the see-saw

6.1.1 Mark out and drill the holes in the pine strip (2)

Note: the holes are different sizes!

6.1.2 Mark out the parts for the support as shown (3) and saw into the individual sizes

NOTE: It is best to mark out the parts with dividers, then saw each length, finally place the pieces on top

of each other and drill them in a single action.

6.1.3 Once the parts have been drilled , mark out and cut the joints and the notches for the candle holder

Note: To make the construction

easier you can simply glue the

parts of the support on top of each

other

instead of cutting the joint

(See diagram below)

E104689#1

Ø 2,50

Ø 2

200

2,50

79°

Ø 3

Ø 2,50

Ø 3

17 23 23

300

8 63 8

Version with joint

Glued version

6.1.4 Saw 4 lengths of 30m long dowels (4) and use them as spacers between the supports.

Glue them in position

Note: From this point on in the plans the description will show the version of the design using the halving

joints.

6.1.5 Cut a 60mm length (5a) from the welding rod (5) and remove any burr from the ends with a file. Glue a woo-

den ball (13) on the end of the rod (5a). Then insert the metal rod through the 2,5m dia hole in the middle of

the see-saw top. Add a washer (9) and push the rod through the central hole in the base, add a further was-

her (9), then finally another wooden ball (13) The see-saw top should be able to swing up and down freely

on this axis.

6.2 Making the Mechanism

6.2.1 Bend a length of welding rod (5) into a bow, see the pattern shown page 9. File any burr from the ends of

the rod.

Note: A length of plastic water pipe ( 90mm dia) or an empty wine bottle will serve as a bending former

6.2.2 Bend the other welding rod (6) to the arm shape shown on the pattern (see page 9) and remove any burr

from the ends.

6E104689#1

85151

10 10

Ø 22

85151

10 10

Ø 22

6.2.3 Slide a connector block (10) so that it is in the middle of the bow and tighten the screws.

Now glue (use an all purpose glue ) the ends of the rod into the holes in the top of the seesaw

Note: Make sure that the bow is pushed right into the top of the see-saw

6.2.4 Insert the straight end of the arm into a wooden ball (8) use a piece of scrap dowel (4) sharpened to a point

to hold the ball in place.

Note: Once this has been seen to work glue it in position with an all purpose glue!

6.2.5 Push the Bi-metal coil (7) over the end of the arm rod and clip it over the hook, clamp it with a pair of pliers

6.2.6 Insert the free end of the Bi-metal coil into the connector block and hold it with the fixing screw. Arrange the

coil so that when a lighted candle is placed underneath the flame will heat the coil.

6.2.7 Testing the design of the mechanism

Light the candle and place it under the thermo metal coil, in a short while the coil will unwind and the arm

will swing to the other side. Once out of the heat the coil will cool and the arm see-saws back to the orginal

position.

If the system does not function properly check that the bearings are free enough. Also check that wooden

ball on the end of the arm is in the correct position. Adjust it to find the correct tipping moment

E104689#1

Endhook

Fixing

6.3 Making the figures

6.3.1 Cut two pieces (14a) each 150mm long and (14) two pieces each 50mm (14b) from the pipe cleaner (14)

6.3.2 Bend the piece (14a) in the middle and about 10mm from the end lay piece 14b across for the arms and

twist them together as shown. Leave about 30mm for the legs (See diagram)

6.3.3 Insert the top of the pipe cleaner into a wooden ball (12) as a head and then draw in the features on the

face with felt tip pen

6.3.4 Bend the arms forward and glue a wooden ball (13) in between the hands

6.3.5 Using the modelling felt (15) see patterns on page 9 , cut out two circles and two strips . The circles serve

as hats and the strips as scarves

6.4 Final assembly and test

6.4.1 Glue a figure on each end of the see-saw

6.4.2 Glue the support in the middle of the base

6.4.3 Light the candle and check the function

8E104689#1

Ø 22

14a

14b 12

Patterns

Scale 1 : 1

E104689#1

85151

10 10

Ø 22

Bow(5b)

Arm (6)

Modelling felt (15)

Hat

Scarf

10 E104689#1

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