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--- workshops:prototypes:twindeck_1210_drawing_machine:start [2019/12/04 12:15]
Peter Musk [Summary]
+++ workshops:prototypes:twindeck_1210_drawing_machine:start [2019/12/19 12:24] (current)
Peter Musk [Design Files]
@@ Line 1: / Line 1: @@
 ====== TwinDeck 1210 Drawing machine ======
-===== Summary =====
+{{ :workshops:prototypes:twindeck_1210_drawing_machine:img_9986_graphics.jpg?nolink&500 |}}
+====== Summary ======
 Use laser cut parts, bolts, nuts , washers, electronic components, a small DC motor and patience to construct a machine that draws Guilloche patterns of almost infinite variety.
@@ Line 11: / Line 11: @@
-==== Rationale ====
+===== Rationale =====
 This workshop was devised as a way to explore the 'M' in STEAM. The complexity of the patterns produced are determined mainly by the relative speeds (gear ratios) of the connected drawing wheels, which are a function of the number of teeth on each gear. When the ratios are a simple factor, less complex patterns are produced and as users explore this device this pattern will emerge. Prime numbers of teeth on the gears give the most complex patterns.
@@ Line 18: / Line 18: @@
 The mathematical explanation of these patterns has been well resolved (though it is complex), and interested participants can be guided to deeper understanding as required.
-==== Skills Introduced ====
+====== Materials ======
-==== Materials ====
+New parts purchased from Ali Express:
-A number labeled photo of materials
+|                                                                                            ^ Description                            | Cost   | Quantity  |
+|{{ :workshops:prototypes:twindeck_1210_drawing_machine:gear_motor.jpg?200&nolink }}         | TT 3V-12V smart car motor              | $1.50  |        1  |
+| {{ :workshops:prototypes:twindeck_1210_drawing_machine:dc_boost_module.jpg?200&nolink }}   | MT 3608 DC-DC boost module             | $0.48  |        1  |
+| {{ :workshops:prototypes:twindeck_1210_drawing_machine:speed_controller.jpg?200&nolink }}  | PWM variable speed motor controller    | $5.50  |        1  |
-^Part Number  ^Description  ^Quantity  |
-|1  |  |1  |
-|2  ||1  |
-==== Tools ====
+=== Additional materials: ===
-==== Files ====
+  * 1 x A3 sheet 3mm clear acrylic (for cutting gears)
+  * 1 x A2 sheet 4mm plywood (to construct console)
+  * 10 x 3mm pop rivets (with pins removed) Size 5.3/4
+  * 2 x 3mm pop rivets (with pins removed) Size 5.2
+  * 1 x USB cable (recycled from dead computer mouse)
+  * 2 x 10mm o-rings (to hold pen in place)
+  * 6 x 25mm M3 countersunk screws
+  * 12 x 15mm M3 button head screws
+  * 10 x M3 washers
+  * 6 x M3 locknuts (for pantograph)
-===== Instructions =====
-Rename the steps as you like, use //italics// or **bold** for emphasis
-==== Step Zero: ====
-When you arrive at the workshop - minimum state of readiness for the participants, cover OHS, not essential for all workshops.
+====== Tools ======
+Assembly during the workshop required
+  * hot glue guns
+  * small Philips screwdrivers
+====== Instructions ======
 ==== Step One: ====
+Assemble the console sides and top using the 15mm M3 screws in the slots provided around the case.  You will need to mount the internal support (for the speed controller) as this is done, locating the lugs into the slots in the console sides.
+{{ :workshops:prototypes:twindeck_1210_drawing_machine:img_9991_inside_console.jpg?nolink&600 |}}
+Do not attach the base at this time.
 ==== Step Two: ====
+{{ :workshops:prototypes:twindeck_1210_drawing_machine:img_9988_console_and_parts_closup.jpg?nolink&600 |}}
+Add the electronics (using hot glue as required.
+The speed controller has 4 holes that match the support, and should be held in place with screws. The reverse button should push through the slot provided and lock into place.
+You will need to remove the speed control knob (it pulls off) to mount from the inside. Fix in place with the threaded washer and knob.
+The motor is held in place with longer screws, but you will need to remove the flexible cover (and discard it).
 ==== Step Three: ====
-==== Step Four: ====
+The instructions for use (see below) explain how the gears are placed, and how the pantograph arms deploy. In trials it was found that the pantograph was a bit too long for easy use, so consider reducing the length, or using a single arm (instead of joining the two halves of each side).
-===== Development notes =====
-===User Guide ===
+The pop rivets go through the center hole of each gear, and locate into holes in the top of the console. Put a washer underneath to reduce friction. If the movement is unstable, consider replacing these with M4 screws, but do not overtighten.
-The following  User Guide hand-out was developed for this workshop explaining the operation and assembly of the device:
-==== Bill of Materials (BOM) ====
-^Material  ^Quantity  ^Cost  ^Supplier  |
+====== Design Files ======
-|Arduino Nano v3  |1  |$3.40  |[[https://goo.gl/HDGZa5|AliExpress]]  |
-|MAX7219-dot-matrix-module  |1  |$2.10  |[[https://goo.gl/ypmgEq|AliExpress]]  |
+Graphics for gift packaging:
+{{ :workshops:prototypes:twindeck_1210_drawing_machine:twindeck1210_packaging.pdf |}}
+Graphics for engraving onto the top of the plywood console:
+{{ :workshops:prototypes:twindeck_1210_drawing_machine:twindeck1210_plywoodb_aa1600.ai |}}
+Laser cutfiles for console, gears, pantograph arms and supports (AI and Corel formats):
+{{ :workshops:prototypes:twindeck_1210_drawing_machine:twindeck_cutfiles.zip |}}
+(one file shows an example of how to layout gears and pantograph supports)
+SVG versions of design and cutfiles:
+{{ :workshops:prototypes:twindeck_1210_drawing_machine:twindeck_svg.zip |}}
+====== Development notes ======
+===Recycled parts ===
+Power for the motor in this device comes via a USB connection (standard 5V). This was chosen to avoid the need for batteries but required preparation prior to the workshop.
+Cutting the USB cable and connector from a defunct piece of equipment provides a reasonable length of cable and a functioning connector for zero cost. The exposed wires were stripped , and soldered to the appropriate connections on the DC-DC boost board described above.
+Testing involved using a multimeter to monitor the DC output while adjusting the in-built trimmer on the boost board (a small potentiometer manipulated with a fine screwdriver), so the output voltage from the USB connection was set to exactly 5V.
+This preparation allows the use of parts recycled from a variety of eWaste (Apple cables run at slightly higher than 5V, for example), and simultaneously allows for checking for faulty USB connectors (which were discarded).
+===User Guide ===
+The following  User Guide hand-out was developed for this workshop explaining the operation and assembly of the device:
+{{ :workshops:prototypes:twindeck_1210_drawing_machine:twindeck1210_user_guide.docx |}}
 ====   ====