270 lines
13 KiB
HTML
270 lines
13 KiB
HTML
<html devsite>
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<head>
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<title>ITS-in-a-Box Assembly</title>
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<meta name="project_path" value="/_project.yaml" />
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<meta name="book_path" value="/_book.yaml" />
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</head>
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<body>
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<!--
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Copyright 2017 The Android Open Source Project
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<p>ITS-in-a-box consists of a plastic box that is laser cut from computer-aided
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design (CAD) drawings, a chart tablet, and a device under test (DUT). This page
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provides step-by-step instructions for assembling the ITS-in-a-box.</p>
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<p><img src=images/camera_iab_cad.png></p>
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<p class=caption><strong>Figure 1</strong>. CAD image for ITS-in-a-box.</p>
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<h2>Required tools</h2>
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<p>Before getting started, ensure you have
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<a href="camera_its_iab_tech_drawings.zip">downloaded the technical
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drawings</a> for the ITS-in-a box and have the following tools available:</p>
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<ul>
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<li>Phillips head screwdriver</li>
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<li>Pliers</li>
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<li>Exacto knife</li>
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<li>Wire cutters or scissors (optional)</li>
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</ul>
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<h2 id=lighting>Step 1: Lighting</h2>
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<p>To assemble the ITS-in-a-box lighting component:</p>
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<ol>
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<li>Gather the lighting hardware shown in Figure 2:
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<br><img src=images/camera_iab_light_assembly_parts.png width="50%"><br>
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<strong>Figure 2</strong>. Light assembly parts.<br><br>
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Hardware includes LED light bars, plastic light baffles, plastic light mounts,
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metal light clips included in the LED lighting kit, and four 6-32 screws with
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acorn head nuts.</li>
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<li>Place LED light bars in the mounts with lights pointing down and towards
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the table, as shown in Figure 3 (left side):
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<br><img src=images/camera_iab_light_bar.png width="50%"><br>
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<strong>Figure 3</strong>. Close-up of light bars with lights facing down
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and screws threaded through clips.<br><br>
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Thread the screws through the light clips using a screwdriver and while holding
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the metal clip. The screw head should be be on the inside of the C shape of the
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light clip as shown in Figure 3 (right side). Threading the screws requires
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pressure as the fit is tight.</li>
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<li>Bolt the clips to the plastic baffles as shown in Figure 4:
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<br><img src=images/camera_iab_light_baffles.png width="50%"><br>
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<strong>Figure 4</strong>. Light baffles with clips attached (acorn nuts are on
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the side of the plastic not shown).</li>
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<li>Assemble the lights by snapping the baffles to the LED light backs with the
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clips.
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<br><img src=images/camera_iab_light_assembled.png width="50%"><br>
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<strong>Figure 5</strong>. Assembled lights.<br><br>
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The LED lights should point down and the plastic should form a back to the light
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to block the shiny, reflective back of the LED light bar.</li>
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</ol>
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<h2 id=phone-mount>Step 2: Phone mounts</h2>
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<p>To assemble phone mounts:</p>
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<ol>
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<li>Gather the phone mount hardware shown in Figure 6:
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<br><img src=images/camera_iab_phone_mount_parts.png width="50%"><br>
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<strong>Figure 6</strong>. Phone mount assembly parts.<br><br>
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Hardware includes two aluminum phone trays, two plungers, two rubber tips, and
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four 8-32 pan-head screws.</li>
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<li>Cut the rubber tips short enough to not interfere with plunger operation
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(roughly in half), then use the rubber tips to cover the plungers.</li>
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<li>Assemble the phone mounts using pan-head screws to attach the plunger
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mechanisms to the aluminum trays.
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<br><img src=images/camera_iab_phone_mount_assembled.png width="50%"><br>
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<strong>Figure 7</strong>. Assembled phone mounts.<br><br>
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Ensure the screws do not protrude beyond the plunger in the retracted or
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extended plunger position.</li>
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</ol>
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<h2 id=phone-mount>Step 3: Aperture plate</h2>
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<p>To assemble the front aperture plate:</p>
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<ol>
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<li>Gather the front aperture plate hardware shown in Figure 8:
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<br><img src=images/camera_iab_front_plate_parts.png width="50%"><br>
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<strong>Figure 8</strong>. Front aperture plate assembly parts (front plate
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top has the narrower space from slots for tabs to edge).<br><br>
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Hardware includes four short nylon screws (provided in the ITS-in-a-box kit) and
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eight washers (required to keep the screws from protruding through the back of
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the plastic plate).</li>
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<li>Add phone mounts to the front square aperture plate as shown in Figure 9:
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<br><img src=images/camera_iab_front_plate_assembled.jpg width="50%"><br>
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<strong>Figure 9</strong>. Assembled front plate, phone mounts in middle
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position.</li>
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</ol>
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<h2 id=tablet-holder>Step 4: Tablet holder</h2>
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<p>To assemble the tablet holder:</p>
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<ol>
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<li>Gather the tablet holder parts shown in Figure 10:
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<br><img src=images/camera_iab_tab_holder_parts.png width="50%"><br>
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<strong>Figure 10</strong>. Tablet holder space assembly parts.</li>
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<li>Attach the spacer bars to the back of the tablet holder by threading a
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nylon screw into the hole at the bottom-left or bottom-right of the tablet
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holder (the screw threads properly in only one direction).</li>
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<li>Mount the spacers on the opposite side of the nylon screw as shown in Figure
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11:
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<br><img src=images/camera_iab_tablet_spacer_detail.jpg width="50%"><br>
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<strong>Figure 11</strong>. Tablet holder, location of plastic spacers and
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nylon screw.</li>
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<li>Assemble the tablet holder with the screw head in the counter-drilled
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plastic, then assemble the remaining pieces as shown in Figure 12.
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<br><img src=images/camera_iab_tab_holder_spacer.png width="50%"><br>
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<strong>Figure 12</strong>. Assembled tablet holder spacer (washers account for
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thickness variations in the plastic).</li>
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<li>Gather the tablet plunger parts as shown in Figure 13:
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<br><img src=images/camera_iab_plunger_parts.png width="50%"><br>
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<strong>Figure 13</strong>. Tablet plunger parts with plastic tips cut
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(later designs have only one plunger in the center).</li>
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<li>Cut the plastic tips to correct length and use the tips to cover the
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plunger heads.</li>
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<li>Attach plungers to the plastic, placing the acorn nuts on the outside to
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ensure minimum clearance on the inside for the tablet (and to prevent
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interference with plunger operation.</li>
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<li>Connect the plunger(s) with the screw heads facing the box as shown in
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Figure 14:
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<br><img src=images/camera_iab_tabholder_assembled.png width="50%"><br>
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<strong>Figure 14</strong>. Assembled tablet holder (acorn nuts face away
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from back panel of box).<br><br>
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All acorn nuts are on the same side of the tablet holder to maximize clearance
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for the tablet.</li>
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</ol>
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<h2 id=box-assembly>Step 5: Assemble box</h2>
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<p>To assemble the box:</p>
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<ol>
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<li>Place the front panel with the circular aperture flat on the table, inside
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facing up.</li>
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<li>Connect the front and back walls by inserting tabs into slots as shown in
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Figure 15:
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<br><img src=images/camera_iab_top_bottom_placed.png width="50%"><br>
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<strong>Figure 15</strong>. Top and bottom attached to front (as seen from
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right side).<br><br>
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Position the front so the chamfered side of the circular aperture is on the
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inside of the box. The front of the bottom can be identified by the small hole
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for the power cord box exit (out of the field of view). The plastic hooks for
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the sides should be pointed in the same direction.</li>
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<li>Attach the back to the top and bottom as shown in Figure 16:
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<br><img src=images/camera_iab_back_no_sides.jpg width="50%"><br>
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<strong>Figure 16</strong>. Back attached, no sides.<br><br>
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Push the back onto the tabs, then slide the back to the right (when facing the
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back of the box) to fit under the hooked tabs.</li></ol>
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<h2 id=light-install>Step 6: Install lights</h2>
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<p>To install the lights:</p>
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<ol>
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<li>Place lights in the assembled box as shown in Figure 17:
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<br><img src=images/camera_iab_light_installed.jpg width="50%"><br>
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<strong>Figure 17</strong>. Proper light placement (back removed).<br><br>
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Ensure lights are pointed in the right direction (towards the top and bottom and
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towards the front of the box).</li>
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<li>Secure lights by squeezing the pin into the small hole on the rectangular
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tab that extends through the slot in the top/bottom, as shown in Figure 18:
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<br><img src=images/camera_iab_pin_led_mount_details.png width="50%"><br>
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<strong>Figure 18</strong>. Detail of inserted pin in LED mount tab on outside
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of box.<br><br>
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Squeezing of the pins is best done with a pair of pliers using gentle pressure;
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you should feel a little give in the plastic as the pins are squeezed in place.
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Insert the pins for both the bottom and top light sets. As the pins are small
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and easy to drop, it is easiest to insert them to the bottom with the box
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upside down.</li>
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<li>Attach the power cord to the lower light bar as shown in Figure 19:
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<br><img src=images/camera_iab_light_cord.jpg width="50%"><br>
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<strong>Figure 19</strong>. Detail of lighting power cord.<br><br>
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Thread the power cord through the hole in lower-front-right. The power cord has
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different connectors at each end: The narrow connector fits to the LED light bar
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and the larger connector fits to the power adaptor.</li>
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<li>To prevent the power cord from pulling on the light assembly, use a zip tie
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to secure the power cord to bottom of box as shown in Figure 20:
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<br><img src=images/camera_iab_light_cord_secured.jpg width="50%"><br>
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<strong>Figure 20</strong>. Power cord zip tie attachment on bottom of box
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(shown on its side); trim ties as necessary.</li>
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<li>Wire the top lights to the bottom lights on the left side and secure the
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cable to the front of the box. Some drawings show the cable secured on side of
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box, but it is easier to wire them to front corner as shown in Figure 21:
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<br><img src=images/camera_iab_light_cord_zip.jpg width="50%"><br>
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<strong>Figure 21</strong>. Detail of light cord anchored out of field of
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view.</li>
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</ol>
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<h2 id=sides-holder>Step 7: Attach sides, tablet holder, and handles</h2>
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<p>To attach the box sides, tablet holder, and handles with locking mechanism:</p>
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<ol>
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<li>Snap the right panel into place by pushing and sliding it upwards. The
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bottom of the panel should be flush with the bottom of the front and back panels
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as shown in Figure 22:
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<br><img src=images/camera_iab_right_side_placed.jpg width="50%"><br>
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<strong>Figure 22</strong>. Right side panel in place (viewed from back).</li>
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<li>Place assembled tablet holder in right tabs as shown in Figure 23:
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<br><img src=images/camera_iab_tabholder_inserted.jpg width="50%"><br>
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<strong>Figure 23</strong>. Right side, tablet holder inserted in slots (viewed
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from back of box so it appears on the left).<br><br>
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If the tabs are too tight to allow the tablet holder to move up and down, sand
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the tabs with 100 grit sandpaper to thin them and create a better fit.</li>
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<li>Snap the left panel into place by pushing and sliding it upwards, as shown
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in figure 24:
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<br><img src=images/camera_iab_left_side_placed.jpg width="50%"><br>
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<strong>Figure 24</strong>. Left side panel in place.</li>
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<li>Gather the handle parts shown in Figure 25:
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<br><img src=images/camera_iab_handle_parts.png width="50%"><br>
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<strong>Figure 25</strong>. Handle and box lock parts.<br><br>
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Hardware includes four wide plastic pieces (for outside the box) and two narrow
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pieces (for top of the box). Screw holes are not placed symmetrically on the
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plastic strips.</li>
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<li>Assemble the handle as shown in figure 26:
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<br><img src=images/camera_iab_handle_assembled.png width="50%"><br>
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<strong>Figure 26</strong>. Assembled handle.<br><br>
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Acorn nuts are usually placed on the top of the box. While this is not strictly
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necessary, it makes the outer part of the handle as flat as possible. If the
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handle is loose, insert washers to allow the acorn nuts to tighten effectively.
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</li>
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</ol>
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<h2 id=final-assembly>Step 8: Final assembly</h2>
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<p>To perform final assembly of the ITS-in-a-box:</p>
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<ol>
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<li>Using two nylon screws (short or long), attach the square aperture panel
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with phone mounts to the front of the box as shown in Figure 27:
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<br><img src=images/camera_iab_front_attached.jpg width="50%"><br>
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<strong>Figure 27</strong>. Attached front panel.<br><br>
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Place one screw on the top of the box and one screw on the bottom of the box.</li>
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<li>Test the 4"x4” gatorboard aperture blank to ensure it fits in the square
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opening, as shown in Figure 28:
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<br><img src=images/camera_iab_gater_no_aperture.jpg width="50%"><br>
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<strong>Figure 28</strong>. Gatorboard installed, no aperture cut.<br><br>
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The fit should be snug. If the blank is too tight, shave it; if too loose, make
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another.</li>
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<li>Cut apertures for cameras. You can cut a single aperture (for testing a
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single phone) or two apertures (for testing two phones). Apertures for the Pixel
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and Pixel XL front and rear cameras are shown in Figure 29:
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<br><img src=images/camera_iab_front_apertures.jpg width="50%"><br>
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<strong>Figure 29</strong>. Front of ITS-in-a-box with front and rear camera
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aperture cuts.<br><br>
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The front camera is a circular aperture since there is no flash or laser, while
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the rear camera is a rectangular aperture that allows the flash and laser to
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operate without being blocked.</li></ol>
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</body>
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</html>
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