Differences

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--- sherline_training_sop [2022/10/03 20:47] – furst
+++ sherline_training_sop [2022/10/05 22:18] (current) – furst
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 Last edited: Furst (08/26/20)
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 ====Overview:====
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 ====Applications====
-The Sherline CNC is used exclusively for for drilling holes in glass, ceramic, silicon, or other brittle materials. Milling of brittle materials is not supported. The Sherline uses a high speed spindle in combination with abrasive diamond drill bits to slowly abrade the material away.
+The Sherline CNC is used exclusively for for drilling holes in glass, ceramic, silicon, and other brittle materials. Milling of brittle materials is not supported. The Sherline uses a high speed spindle in combination with abrasive diamond drill bits to slowly abrade the material away.
 Typical applications include adding macro to micro interface connecters to Microfluidics chips.
 ====Software====
-The Sherline CNC uses a retrofitted Sherline mini mill in combination with the FlashCut CNC software. This SOP does not cover dxf2fgc conversion code.
+The Sherline CNC uses a retrofit Sherline mini mill in combination with the FlashCut CNC software. This SOP does not cover dxf2fgc conversion code.
 FlashCut CNC offers a user interface for positioning, zeroing, and running the G-code, however it has no CAM capabilities. This means that G-code must be hand written based on the location of holes.
 ====Sample Prep====
-A backing plate is required for drilling, and should be bonded to the substrate to be drilled to improve backside cut quality. If bonding is not permitted, slowing down cut speed may result in less blowout on the backside of the hole.
+A backing plate is required for drilling, and should be bonded to the substrate to be drilled to improve backside cut quality and prevent drilling into the fixture. If bonding is not permitted, slowing down cut speed may result in less blowout on the backside of the hole and a backing plate should still be used.
   - set CrystalBond hotplate to 121 degrees C
   - place a sheet of tinfoil or wax paper over hotplate to avoid spilling of crystal bond
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 ====CNC Setup====
-  - Turn on the Flashcut CNC box {{:tools:sherlinecncmill:img_2879.jpg?400|}}
+{{:tools:sherlinecncmill:img_2879.jpg?400|}}
+  - Turn on the Flashcut CNC box
   - On the Sherline computer, start FlashCut CNC (thunderbolt icon)
   - Within FlashCut, select the home tab, followed by seek home. This will move all axis to their zero position.
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   - clamp the bonded sample into the top left corner of the fixture
-  - Without changing the coordinates, swap the edge finder for the selected abbrasive drill bit
+  - Without changing the coordinates, swap the edge finder for the selected abrasive drill bit that you intend to drill with
   - Using the jog commands, position the spindle over a sacrificial portion of the sample
   - slowly ramp the spindle speed up to full speed and apply diluted Kool Mist coolant over the sample and within the fixture.
-  - using incremental jog, slowly lower the drill until a the coolant over the sample turns cloudy due to glass dust
+  - using incremental jog on slow speed, slowly bring down the bit until it enters the fluid and just touches the surface of the wafer. a small plume of glass dust will be seen when the rotating bit contacts the wafer or glass surface.
   - zero the program Z axis.
   - raise the spindle using the jog function and turn off the spindle.
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   * Used drill bits are free
   * If a new dill bit is selected, ensure it is logged within FBS so recharge can be applied {{:tools:sherlinecncmill:img_2873.jpg?400|}}
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