add documentation

helpfulengineering · Aug 31, 2020 · b7c9174 · b7c9174
1 parent f3c0d4e
commit b7c9174
Show file tree

Hide file tree

Showing 8 changed files with 63 additions and 0 deletions.
diff --git a/docs/manufacturing/assets/valve_flush.jpg b/docs/manufacturing/assets/valve_flush.jpg
diff --git a/docs/manufacturing/assets/valve_packed.png b/docs/manufacturing/assets/valve_packed.png
diff --git a/docs/manufacturing/assets/valve_print_supports.png b/docs/manufacturing/assets/valve_print_supports.png
diff --git a/docs/manufacturing/assets/valve_section.png b/docs/manufacturing/assets/valve_section.png
diff --git a/docs/manufacturing/assets/wash_steps.jpg b/docs/manufacturing/assets/wash_steps.jpg
diff --git a/docs/manufacturing/valve.md b/docs/manufacturing/valve.md
@@ -0,0 +1,47 @@
+# Valve
+
+![valve section view](assets/valve_section.png)
+
+The valve is designed to be printed using SLA printing. It's theoretically possible to achieve the required tolerances with FDM, but holding pressure at \~40 PSI is an additional challenge, easily met using SLA.
+
+## Print Settings
+
+In order to achieve the 0.4mm hole required to achieve the necessary airspeed, SLA exposure times will need to be reduced far below the defaults.
+
+### AnyCubic Photon Z - "Basic" Resins
+
+|-----------------|---------|
+| Layer Thickness | 0.050mm |
+| Normal Exposure | 3s      |
+| Bottom Exposure | 60s     |
+
+## Orientation / Supports
+
+![valve with print supports](assets/valve_print_supports.png)
+
+In order to minimize cleanup while preserving surface quality, it is recommended to print the valve with the barb attachment up, and generate supports for the barb. This also permits an increased print density when compared to an angled print.
+
+![valve packed](assets/valve_packed.png)
+
+## Post-Processing
+
+### Washing
+
+To wash the part of uncured resin, and preserve IPA supplies, a 4-wash process is advised (left to right):
+
+![washing steps](assets/wash_steps.jpg)
+
+* Step 1: IPA - bulk resin removal - remove supports after this
+* Step 2: IPA - resin removal
+* Step 3: IPA - final resin removal
+* Step 4: Water - IPA removal
+
+In addition to the usual concerns with washing SLA parts, the internal cavity of the void must be flushed of uncured resin. This step is also useful to verify that none of the egress holes have clogged during printing.
+
+Flushing should be performed at each stage of the washing process to ensure the internal cavity is fully clear of uncured resin.
+
+![valve flushed](assets/valve_flush.jpg)
+
+### Curing
+
+Due to the reduced exposure times in printing, it is recommended to double standard curing times to ensure a full cure, especially of the interior cavity.
diff --git a/docs/testing/README.md b/docs/testing/README.md
@@ -0,0 +1 @@
+# Testing / QA
diff --git a/docs/testing/equipment.md b/docs/testing/equipment.md
@@ -0,0 +1,15 @@
+# Equipment
+
+In order to verify the successful manufacture of the valve, the following equipment will be needed:
+
+## Air Supply
+
+Air compressor with regulator, should be able to provide 15L/min @ 40 PSI
+
+## Flow limiter
+
+Pressure compensated, should be able to limit to 15L/min to match standard medical equipment. Can be approximated with an 0.8mm printer nozzle @ 35 PSI. [Calculator for airflow](https://www.tlv.com/global/TI/calculator/air-flow-rate-through-orifice.html)
+
+## Manometer
+
+A manometer that can accurately show pressures in the 0-20cm H2O range is vital. A U-tube manometer is easily constructed out of clear vinyl tubing.