1. Step-by-step assembly instructions
Hydraulic Claw
Step-by-step assembly instructions
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2. (c) 2013 Mechanical Kits Ltd.
Contents of Claw Kit
Wooden pieces (⅜” cross-section): 2 X 20 cm (7.87”); 2 X 14cm (5.51”); 2 X 6.5cm (2.56”); 2 X 6cm (2.36”); 2 X 4.5cm (1.77”); 3 X 4cm (1.58”); 2 X 1cm (0.39”) 4 X forks 2 X 3²cm Block (1.81²”) Syringes, 10cc: 4 (2 have a hole in the plunger) Plastic Tubing: 2 lengths Wooden dowel, 3/16” diam.: 1 X 11.5cm (4.53”); 1 X 11cm (4.33”); 1 X 9cm (3.54”); 2 X 7cm (2.76”); 1 X 5cm (1.97”); 2 X 3cm (1.18”) Syringe Holders: 2 Mini-washers: 30 1 piece thin card Plus a small piece of sandpaper
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Cut out small pieces from the card as shown below – these will be used to reinforce pieces of wood joined together. Each square is 1cm².
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Use 2 pieces of card (3 cm²) to reinforce the two blocks, and 4 card strips (5cm X 1cm) to join two forks with two 4.5cm wooden pieces (these have 1 hole in through them). Using a dowel as a temporary guide, join the other two forks with two 4cm pieces, as shown, using 4 “L”-shaped card pieces. Use a small amount of wood glue under the card strips.
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Use two 6cm wood pieces, card strips and the longer fork arms to join the arms to the 6cm pieces at 90°, as shown below. Use a dowel as a guide to ensure the holes in the arms and the pieces are aligned.
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Use a 5cm dowel and four mini-washers to hold the longer fork arms in place. Insert a 7cm dowel through the previous construction and the plunger of one of the 10cc syringes. Use two mini-washers to hold the plunger in the middle and two more on the outsides of the dowel, as shown.
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Using the 11cm dowel as a guide, layout and then connect the following, as shown below, (left to right): mini-washer, 14cm piece, 1cm spacer block, 6.5cm piece, mini-washer, 3cm² block, mini-washer, 6.5cm piece, 1cm spacer block, 14cm piece and mini-washer. Place on one side for later.
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Using a 9cm dowel, connect (left to right, on top) a mini-washer, 20cm piece, the 6.5cm piece using its 2nd hole from the previous construction, the 4cm spacer, the other 6.5cm piece and 20cm piece and another mini washer. This is the main frame.
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Connect the fork arm sub-system to the main frame using the 11.5 dowel and lay out the construction as below. The syringe should lay on the block of the main frame. Strip off the small “sticky pad” from the outside of one of the syringe holders and push it firmly onto card on the 3cm² block of the main frame and place the syringe in it so the end of the syringe just protrudes from it. Do not strip off the sticky pad inside the syringe holder yet.
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Use the remaining 7cm dowel to connect the 2nd syringe with a hole in its plunger to the remaining two forks using 4 mini-washers, as shown. The two 3cm dowels, each with two mini-washers, connect the forks and this syringe to the main frame. Secure the syringe holder on the 2nd 3cm² block, and then, without removing the sticky pad inside the holder, push the syringe into it so that the lip of the syringe barrel is aligned with the edge of the 3cm² block.
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Check that your construction looks like the picture below. In it the upper forks are closed and the lower forks lay flat on the working surface. Now remove the syringes from their holders, remove the sticky pads inside from them, and secure the syringes in place.
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Open the top claw. Connect tubing to the syringes and then the other two syringes to the tubing so that they are complimentary. For example: if the lower syringe is fully open then the syringe driving it will be fully closed. The device can be used with air or water in the syringes. Use a very small drop of washing-up liquid with the water as a lubricant.
(c) 2013 Mechanical Kits Ltd.