Opitec 104.689 User manual

1
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
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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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

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
4
D105434#1
Scale 1 : 2
5b
9
10
5a
13
13
12
14a
14b
14a
14b
3
15
15
1
13
2 12
3
6
4
7
13
8

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)
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E104689#1
Ø 2,50
Ø 2
200
90
3
10
2,50
79°
Ø 3
Ø 2,50
Ø 3
17 23 23
300
8 63 8
Version with joint
Glued version
2
3
3

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.
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4
13
13
5a
9
60
90
85151
10 10
4
Ø 22
70
4
60
90
85151
10 10
4
Ø 22
70
4
5b
6

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
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6
4
8
10
7
5b
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
70
4
14a
14b 12
13

Patterns
Scale 1 : 1
9
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60
90
85151
10 10
4
Ø 22
70
4
Bow(5b)
Arm (6)
Modelling felt (15)
Hat
Scarf

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Once the correct position is achieved finally glue it in place.
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E104689#1