sherline_training_sop
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Last edited: Furst (08/26/20) | Last edited: Furst (08/26/20) | ||
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====Overview: | ====Overview: | ||
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* Flashcut | * Flashcut | ||
* Sample prep | * Sample prep | ||
+ | * CNC Setup | ||
+ | * G-code Modification | ||
* Drilling | * Drilling | ||
* Printer Maintenance | * Printer Maintenance | ||
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* Cleaning | * Cleaning | ||
* Remember to enter job information into the 3D print job log! | * Remember to enter job information into the 3D print job log! | ||
+ | {{: | ||
====Safety==== | ====Safety==== | ||
- | * The print heads can be very hot - do not touch them with bare hands unless positive they are cool. | + | Eye injuries |
- | * As with any automated machinery make sure that your body is clear of the moving parts to avoid injury. | + | |
- | * The support removal tank for the F270 is filled with heated caustic chemicals that dissolve the support material. An apron, Gloves, and a face shield | + | |
- | ====Job Setup==== | + | ====Applications==== |
- | - **At the Computer: | + | The Sherline CNC is used exclusively |
- | -Load your STL file into the print software on the computer adjacent to the printer (Cura for Ultimaker, GrabCad Print for F270). | + | |
- | - Set Print Parameters: | + | |
- | - Position the part on the build tray in a way that is conducive to 3D printing (flat side down) | + | |
- | - Select appropriate layer or slice height (the more slices the higher the print resolution but the longer it takes to print) | + | |
- | - For Ultimaker: | + | |
- | - Select " | + | |
- | - Check appropriate filament | + | |
- | - Send job to Ultimaker using USB drive | + | |
- | - For F270: | + | |
- | - The F270 the printer will print a raft before printing the model. Make sure first layer is set to support material or removal will be incredibly difficult. | + | |
- | - Send job to F270 over Ethernet | + | |
- | - Record the material used and print time in the online log along with the other job information requested. The print log should be on the desktop or https:// | + | |
- | - **At the printer: | + | |
- | - Ultimaker: | + | |
- | - Make sure print bed is clean | + | |
- | - F270: | + | |
- | - Make sure that there is enough room on an CLEAN build tray for your part, and that the build tray is secured | + | |
- | - Start the job at the printer | + | |
- | ====Part Removal and Cleaning==== | + | Typical applications include adding macro to micro interface connecters |
- | **Ultimaker** | + | |
- | * Remove part from print bed using a spatula or razor being careful not to cut yourself or scratch the build plate. Make sure no body part is in line with the tool should it slip or the part break free unexpectedly. | + | |
- | * If support was used, submerge print in warm water for several hours to dissolve PVA filament. (prints can warp if submerged in water for over 24 hours) \\ | + | |
- | **F270** | + | |
- | * Remove the build tray and flex it to break the bond between the material and the tray. | + | |
- | * Separate your part from the build tray with a spatula and scrape off any debris so they tray can be reused. | + | |
- | * Put on the appropriate PPE: don gloves, a face shield, and a lab coat. | + | |
- | * Carefully, slowly, and without splashing cleaning solution, open the support removal tank lid and remove and open the tank. | + | |
- | * Place large parts directly in the tank, small parts may be put in the SS box and placed into the main basket. | + | |
- | * Carefully, slowly, and without splashing lower the basket back into the tank and close the lid. | + | |
- | * Set timer for 8 hours using the " | + | |
- | * Select the temperature to be 70 degrees C and push the power button to warm the tank. | + | |
- | * After cleaning time has elapsed, follow the instructions above for opening and removing parts. | + | |
- | * Rinse part in warm water. | + | |
- | ---- | + | ====Software==== |
+ | The Sherline CNC uses a retrofit Sherline mini mill in combination with the FlashCut CNC software. This SOP does not cover dxf2fgc conversion code. | ||
- | ====Rates==== | + | FlashCut CNC offers a user interface for positioning, |
- | F270: | + | ====Sample Prep==== |
- | {| | + | 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 |
- | ! Material || $/Spool || cu in/Spool || $/cu in || $/cc | + | - place a sheet of tinfoil or wax paper over hotplate to avoid spilling of crystal bond |
- | |- | + | - place sample and backing plate on covered hot plate and allow them to reach equilibrium |
- | PLA || 79 || 60 || 1.31 ||.08 | + | - using the CrystleBond stick and a pair of tweezers to hold the sample in place, gently paint on a thin layer of Crystal Bond to both the substrate and backing plate |
- | |- | + | - using tweezers, flip the substrate over and place CrystalBond sides together, wiggle side to side to minimize air bubbles. |
- | ABS || 164 || 60 || 2.73 || .17 | + | - place the hot bonded slides on the teflon fixture and align the substrate and backing plate. Remove from heat. |
- | |- | + | - After sample has cooled, use a razor blade to remove any CrystalBond on the edges of the sample. This will insure that edge finding finds the edge of the sample, rather than the edge of the crystlebond. |
- | Sup || 228 || 60 || 3.79 || .23 | + | - After drilling is done, place back on hotplate to separate backing plate from sample before placing sample in acetone to remove any remaining CrystalBond. |
- | |} | + | |
- | F270 hourly charge: $1/hr to pay for head replacement | + | ====CNC Setup==== |
+ | {{:tools: | ||
+ | - 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. | ||
+ | - load the edge finder into the drill chuck | ||
+ | - select the jog menu from the FlashCut software | ||
+ | - using the faster setting, jog the edge finder to just below the edge of the fixture and within a quarter inch of the top left corner edge in both X and Y. | ||
+ | - start the spindle by slowly ramping up the speed from zero (starting the spindle at full speed can result in damage to the motor) to between 800 and 1300 RPM. | ||
+ | - switching to incremental jog, slowly jog in x or y until the edge finder kicks out | ||
+ | - once kicked out, zero the program axis and repeat | ||
+ | - turn the spindle off and jog the spindle up and away from the fixture | ||
+ | - offset the X, Y program coordinates to account for the radius of the edge finder | ||
+ | - offsetting by the radius can be easily accomplished by keying in values to the program coordinate system. | ||
+ | - zero the program coordinates again, and verify the center of the edge finder is directly over the corner of the fixture | ||
- | Ultimaker: | + | **The machine is now zeroed in X and Y** |
- | ABS: .12/gram | + | |
- | ----- | + | |
- | =====F270 Quick Review===== | + | |
- | Tool Lead: Andrew Furst \\ | + | |
- | Contact: Andrewfurst@ucsb.edu | + | |
- | ====Safety Concerns==== | + | |
- | | + | |
- | | + | |
- | | + | |
- | | + | - Without changing the coordinates, |
- | - Select File -> New Project -> Add Models -> Import desired models | + | - Using the jog commands, position the spindle over a sacrificial portion of the sample |
- | - Move models around on virtual build tray so that models on a used build tray do not overlap any previously printed spots | + | - slowly ramp the spindle speed up to full speed and apply diluted Kool Mist coolant over the sample and within |
- | - the purge block and printed model should be placed close together to minimize print time | + | - using incremental jog on slow speed, slowly bring down the bit until it enters the fluid and just touches |
- | - Select "Print Settings" | + | - zero the program Z axis. |
- | - From menu, select desired slice height, and verify that the first layer material is set to support. | + | - raise the spindle using the jog function |
- | - Open and place build tray into F270, making sure that the tray is locked in place by pulling up on the front locking arm until arm is PARALLEL to build tray. | + | |
- | - Select print, and send the job to the F270 3D printer | + | |
- | - on the F270 touch screen, select your job, and then select print. | + | |
- | ====Post Processing==== | + | **The machine |
- | | + | |
- | | + | |
- | ====Maintenance Schedule | + | ====G-code modification==== |
- | | + | The sample G-code is as follows: |
- | | + | |
- | | + | |
- | * Clean exterior of printer as needed | + | G21 (select mm units) |
- | * Clean touchscreen as needed | + | G49 G80 G90 (cancel offsets, cancel cycles, absolute coordinates) |
+ | G98 (Move the drill away from the part when drilling is finished) | ||
+ | |||
+ | G00 X0 Y0 Z5 (rapid move to the upper left corner of slide, 5mm above) | ||
+ | |||
+ | (Hole drilling blocks) | ||
+ | |||
+ | (G73=canned peck drilling cycle 1) | ||
+ | G73 X17 Y-12.5 z-1.2 Q.1 R0.5 F2.5 (x=coordinate of hole, y=coordinate of hole, Z=depth of hole, R=retract value, Q=depth of each peck, F=feedrate) | ||
+ | |||
+ | (G73=canned peck drilling cycle 2) | ||
+ | G73 X58 Y-12.5 z-1.2 Q.1 R0.5 F2 (x=coordinate of hole, y=coordinate of hole, Z=depth of hole, R=retract value, Q=depth of each peck, F=feedrate) | ||
+ | |||
+ | |||
+ | (Closing block) | ||
+ | M30 | ||
+ | |||
+ | |||
+ | When using G73 canned cycle, X and Y set the coordinates of the hole, and Z sets the maximum depth below machine zero. R sets the starting height of the drilling cycle as well as the retract height between pecks) | ||
+ | (Q sets the depth each peck will go into the workpiece until it excedes the Z value set above. F sets the feedrate or the rate at which the drill will decend into the workpiece) | ||
+ | (If you are cracking the slide or getting excessive break out you should reduce the feedrate value and the depth of each peck. | ||
+ | |||
+ | The Z value should be slightly deeper than the thickness of the sample without backing plate. This insures all holes drilled in the sample are through holes. NEVER drill without a backing plate as you will hit the fixture. | ||
+ | |||
+ | ====Drilling==== | ||
+ | | ||
+ | - the file should be visible in the bottom left hand corner of the FlashCut GUI. ensure all values are correct before continuing | ||
+ | | ||
+ | | ||
+ | - select the start button to run the G-code | ||
+ | - as the machine drills, flush the cut continuously with coolant to wash away glass particles | ||
+ | - use the vacuum line to soak up any extra coolant during the run | ||
+ | |||
+ | |||
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+ | ====Rates==== | ||
+ | * hourly billing for lab use applies | ||
+ | * No additional charges result from tool time | ||
+ | * Used drill bits are free | ||
+ | * If a new dill bit is selected, ensure it is logged within FBS so recharge can be applied {{: | ||
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+ | |||
sherline_training_sop.1664825141.txt.gz · Last modified: 2022/10/03 19:25 by furst