formech_1372:formech_1372

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision
Previous revision
formech_1372:formech_1372 [2020/06/23 02:05] formlabformech_1372:formech_1372 [2024/03/01 01:38] (current) – [Medium Gauge Film] formlab
Line 12: Line 12:
   * Large: ''1370 x 660mm''   * Large: ''1370 x 660mm''
  
-[Vacuum Forming Guide](https://formechusa.com/wp-content/uploads/Vacuum_Forming_Guide.pdf) +=== Pre-drying === 
-----+  * PMMA: 70°C 4 hours
  
-===== Available sheet materials ===== 
  
 +[[https://formechusa.com/wp-content/uploads/Vacuum_Forming_Guide.pdf|Vacuum Forming Guide]]
 +----
  
-{{:formech_1372:materials-ps.jpg?|}}+===== Mould tips =====
  
-==== PS - Polystyrene ==== +<WRAP center round important 60%> 
-  * Uncut sheets. These can be used for the large and small forming area+Moulds should not contain moisture or dust (!) since it could harm the vacuum pump
-  * Thicknesses: 1mm, 1.5mm +</WRAP>
-  * Colors: White, red, black (black has a glossy side), green, blue+
  
-^ Color      ^ Surface finish       ^ Thickness          ^ Size         ^ Cost (per sheet)       ^ 
-| white | matte / glossy | 1mm | 2000X1200 | €18,20 | 
-| white | matte / glossy | 1,5mm | 2000X1200 | €26,80 | 
-| white | matte / matte | 4mm | 2000X1000 | €45,30| 
-| black | matte / matte | 1mm | 2000X1200 | €20,50 | 
-| black | matte / glossy | 1,5mm | 2000X1200 | €32,70 | 
-| red | matte / matte | 1mm | 2000X1200 | €20,50 | 
-| red | matte / glossy | 1,5mm | 2000X1200 | €32,70 | 
-| green | matte / matte | 1,5mm | 2000X1200 | €31,60 | 
-| blue | matte / glossy | 1,5mm | 2000X1200 | €32,70 | 
  
 +  * Can the mould be removed after forming?
 +    * {{:formech_1372:good-mould.png?200|}}\\ **Good mould**
 +    * {{:formech_1372:bad-mould-01.png?200|}}\\ **Bad mould**: even though it looks like it should work, the plastic shrinks while cooling, so vertical walls will be gripped so tight it'll be impossible to remove the mould.
 +    * {{:formech_1372:bad-mould-02.png?200|}}\\ **Very bad mould**: this is an undercut. The mould can never be removed without cutting the plastic sheet
 +  * Include draft angles:\\ {{:formech_1372:draft-angle.png?200|}}
 +  * Can the vacuum reach all pockets?
 +    * {{:formech_1372:vent-holes_01.png?200|}}\\ {{:formech_1372:vent-holes-02.png?200|}}\\ Insert vent holes
 +  * Can it withstand the pressure?
 +  * Can it withstand the heat?
 +==== Tested mould materials include: ====
 +  * **Plaster** 
 +    * <color orange>**!**</color> Apply primer first and then varnish the surface
 +  * **Wood**
 +    * <color orange>**!**</color> Vacuum or varnish the surface
 +  * **PU foam**
 +    * <color orange>**!**</color> Varnish the surface!
 +    * <color green>**+**</color> Heat resistant
 +    * <color green>**+**</color> Strong enough
 +    * <color green>**+**</color> Easy to form (manually or CNC)
 +    * <color green>**+**</color> Material is porous so vent holes in small pockets are not needed
 +    * <color red>**-**</color> Limited runs (once or twice)
 +    * <color red>**-**</color> Hard to remove mould from formed sheet without breaking it
 +  * **3D printed parts** 
 +    * <color red>**-**</color> Limited runs
 +    * Plastic deforms: infill becomes visible if not enough top layers or walls.
 +  * ...
  
 +===== Available sheet materials =====
  
-=== How much does it cost? ===+{{:formech_1372:materials-petg.jpg|}} 
 +==== PETG - Polyethylene terephthalate glycol-modified ==== 
 +Transparent, glossy surface.
  
-<code> +^ Thickness ^ Size ^ Cost (per sheet) ^ 
-startup cost + plastic sheet cost * plastic sheet count * material multiplier +| 1mm | Large - 1370 x 660mm | €16,10 | 
-  + +| 2mm | Large - 1370 x 660mm | €32,20 | 
-( machine time (minutes) * machine time cost ) +| 1mm | Small - 500 x 500mm | €4,20 | 
-</code>+| 2mm | Small - 500 x 500mm | €7,14 | 
 +| 3mm | Small - 500 x 500mm | €10,36 |
  
-  * startup cost: €2: only when vacuum form machine is used +----
-  * plastic sheet cost: cost sheet, including VAT and transportation +
-  * material multiplier: 30%: item cost * 1,3 +
-  * machine time cost: €5 per hour (€0,08333333 per minute)+
  
 +{{:formech_1372:materials-pmma.jpg|}}\\
 +PMMA samples
 +==== PMMA - Poly(methyl methacrylate) ====
  
-=== Plastic sheet prices ===+PMMA is also known as Acryl. It has a glossy surface. 
  
-PETG CLEAR - FULL (1370 x 660) - 1mm: 13,00 per piece\\ +^ Color      ^ Light      ^ Thickness          ^ Size         ^ Cost (per sheet      ^ 
-PETG CLEAR WINDOW (500 x 5001mm: 3,90 per piece\\ +| White | translucent | 3mm | large 1370 x 660mm | 39,20 | 
-PETG CLEAR WINDOW (500 x 500) 2mm: 6,63 per piece\\ +| White | translucent | 3mm | small - 500 x 500mm | €11,20 | 
-PETG CLEAR WINDOW (500 x 500- 3mm9,62 per piece\\+| Green | transparent | 3mm | small - 500 x 500mm | €16,80 | 
 +| Light blue | translucent | 3mm | large 1370 x 660mm | 58,80 | 
 +| Light blue | translucent | 3mm | small - 500 x 500mm | €16,80 | 
 +| Dark blue | transparent | 3mm | large 1370 x 660mm | 58,80 | 
 +| Dark blue | transparent | 3mm | small - 500 x 500mm | €16,80 | 
 +| Yellow | transparent | 3mm | small - 500 x 500mm | €16,80 | 
 +| Cream | transparent | 3mm | large 1370 x 660mm | €58,80 | 
 +| Cream | transparent | 3mm | small - 500 x 500mm | 16,80 |
  
-VIKUGLAS PMMA XT OPAAL FULL (1370 x 660) 3mm: €36,4 per piece\\ +----
-VIKUGLAS PMMA XT OPAAL WINDOW (500 x 500) 3mm: €10,4 per piece\\+
  
-ALTUGLAS PMMA GROEN FULL (1370 x 660) - 3mm: €54,6 per piece\\ +{{:formech_1372:materials-ps.jpg?|}}\\ 
-ALTUGLAS PMMA GROEN - WINDOW (500 x 500) - 3mm: €15,6 per piece\\+polystyrene samples
  
-ALTUGLAS PMMA LICHTBLAUW FULL (1370 x 660) - 3mm: €54,6 per piece\\ +==== PS Polystyrene ==== 
-ALTUGLAS PMMA LICHTBLAUW - WINDOW (500 x 500) - 3mm: €15,6 per piece\\+Uncut sheets. These can be used for the large and small forming area.
  
-ALTUGLAS PMMA DONKERBLAUW - FULL (1370 x 660- 3mm: 54,6 per piece\\ +^ Color      ^ Surface finish       ^ Thickness          ^ Size         ^ Cost (per sheet      ^ 
-ALTUGLAS PMMA DONKERBLAUW - WINDOW (500 x 500) - 3mm: 15,6 per piece\\+| white | matte / glossy | 1mm | 2000X1200 | 19,63 | 
 +| white | matte / glossy | 1,5mm | 2000X1200 | 28,88 | 
 +| white | matte / matte | 4mm | 2000X1000 | €63,42| 
 +| black | matte / matte | 1mm | 2000X1200 | €22,06 | 
 +| black | matte / glossy | 1,5mm | 2000X1200 | €35,19 | 
 +| red | matte / matte | 1mm | 2000X1200 | €22,06 | 
 +| red | matte / glossy | 1,5mm | 2000X1200 | €35,19 | 
 +| green | matte / matte | 1,5mm | 2000X1200 | €34,03 |
  
-ALTUGLAS PMMA GEEL - FULL (1370 x 660) - 3mm: €54,6 per piece\\ +=== How much does it cost? ===
-ALTUGLAS PMMA GEEL - WINDOW (500 x 500) - 3mm: €15,6 per piece\\+
  
-ALTUGLAS PMMA CRÈME - FULL (1370 x 660) - 3mm: €54,6 per piece\\ 
-ALTUGLAS PMMA CRÈME - WINDOW (500 x 500) - 3mm: €15,6 per piece\\ 
  
-PS WIT 900 glans/mat 1mm 2000X1200: €18,226 per piece\\ +  startup cost + ( plastic sheet cost * plastic sheet count * material multiplier ) 
-PS WIT 900 glans/mat 1,5mm 2000X1200: €26,819 per piece\\  +  + 
-PS WIT 900 MAT/MAT 4mm 2000X1000: €45,30 per piece \\ +  ( machine time (minutes) * machine time cost )
-PS ZWART 840 MAT/MAT 1mm 2000X1200: €20,49 per piece\\  +
-PS ZWART 840 glangs/mat 1,5mm 2000X1200: €32,67 per piece\\+
  
-PS ROOD 173 MAT/MAT 1mm 1200X1200: €20,49 per piece\\ 
-PS ROOD 173 glans/mat 1,5mm 2000X1200: €32,67 per piece\\ 
  
-PS GROEN 843 MAT/MAT 1,5mm 2000X1200: €31,59 per piece\\ +  * startup cost: €2: only when vacuum form machine is used 
- +  * plastic sheet cost: cost sheetincluding VAT and transportation 
-PS BLAUW 5010 glans/mat 1,5mm 2000X1200: €32,67 per piece\\+  * material multiplier: item cost * 1,
 +  * machine time cost: €8 per hour (€0,08333333 per minute)
  
- 
----- 
- 
- 
-=== PMMA 3mm === 
-  * heater 75% en 80% 
-  * 230 sec heating (no longer) 
-  * 60 sec cooling 
-  * --> Worked reasonably well 
-  * --> This is lower heat for a longer period 
- 
- 
-=== Medium Gauge Film (0,15mm) === 
-  * profile: 1mm PET (heater 85%) 
-  * heating: 8 seconds 
-  * vacuum: manual operation: start-stop technique to avoid holes if there are large cavities 
- 
----- 
  
 ===== Materials allowed in Formlab ===== ===== Materials allowed in Formlab =====
Line 147: Line 156:
   * **Forming temp range**: ''150–180°C''   * **Forming temp range**: ''150–180°C''
   * **Conclusion**: Very good impact resistance, tricky to get good results – similar price to HDPE   * **Conclusion**: Very good impact resistance, tricky to get good results – similar price to HDPE
- 
- 
- 
  
 ---- ----
Line 179: Line 185:
   * //Formech//: A hand held **infrared thermometer** is essential to know the temperature of the sheet, and they are fairly inexpensive.   * //Formech//: A hand held **infrared thermometer** is essential to know the temperature of the sheet, and they are fairly inexpensive.
   * //Formech//: There is no harm in heating material **slowly**, providing that it eventually gets up to the correct forming temperature. In fact it’s preferable because heat can creep into the full thickness of the sheet. The main reason that people heat plastic rapidly is for output reasons. They want to make more parts in as little time as possible.   * //Formech//: There is no harm in heating material **slowly**, providing that it eventually gets up to the correct forming temperature. In fact it’s preferable because heat can creep into the full thickness of the sheet. The main reason that people heat plastic rapidly is for output reasons. They want to make more parts in as little time as possible.
 +  * **Bubble moulding**: The table should be lowered. If it's in the up-position, the air can't pass the seals.
  
 +
 +===== Drying sheets with the oven =====
 +
 +Use one of the ceramics oven in the metal atelier.\\
 +The control cabinet is behind the oven. \\
 +{{:formech_1372:oven_metal_atelier_01.jpg?400|}}\\
 +
 +
 +Get the key from Peter to be able to power on the oven.\\
 +To turn on the oven, insert the key and turn it to the right. Then turn the red knob to the right.\\
 +
 +==== Control panel ====
 +
 +{{:formech_1372:oven_metal_atelier_02_control_panel.jpg|}}
 +
 +  * There are 9 programs
 +  * Each program can have multiple segments
 +    * Example: segment 1: warm up to 70° in 30 min, segment 2: keep that temperature for 4 hours
 +  * Each segment has 2 values: a temperature, and a time
 +
 +
 +  - Press 'program' until it goes to program 5
 +    - Nothing is on here yet. (This might change in the future)
 +    - Press until there's an empty preset
 +    - In the future there might be a paper with an explanation of what programs do what. I could have a fixed entry on the list
 +  - Segment 1' is blinking. Use the up-down arrows to set a target temperature
 +  - Press the --> arrow to go to the time value
 +  - Set the time with the up-down arrows
 +  - When ready, press the stop / start button to start the oven
 +
 +==== Suggested program ====
 +
 +  * Segment 1: temp: 70° time: 30 min
 +  * Segment 2: temp: 70° time: 4 hours
 +  * Segment 3: temp: 0° time: 30 min
 ===== Clamping tips for high gauge sheets ===== ===== Clamping tips for high gauge sheets =====
   * Apply 80 grit strips of sand paper to the underside of the clamp frame to provide more grip on the sheet. The strips can be held in place with a good quality double sided tape, contact adhesive or preferably a silicone adhesive to take the heat.   * Apply 80 grit strips of sand paper to the underside of the clamp frame to provide more grip on the sheet. The strips can be held in place with a good quality double sided tape, contact adhesive or preferably a silicone adhesive to take the heat.
Line 187: Line 229:
   * Check you have even pressure on the clamping on each side.\\ {{:formech_1372:formech_even_pressure.jpg?400|}}   * Check you have even pressure on the clamping on each side.\\ {{:formech_1372:formech_even_pressure.jpg?400|}}
  
 +
 +===== Machine presets =====
 +
 +==== PS ====
 +  * 1mm (Experimental v2)
 +    * Power: 70%
 +    * Heating: 45 seconds
 +  * 2.5mm (Experimental v2)
 +    * Power: 70%  
 +    * Heating: 85 seconds  
 +
 +==== PETG ====
 +  * 2mm (OK)
 +    * Power: 70%  
 +    * Heating: 70 seconds  
 +
 +==== PMMA ====
 +  * 3mm
 +    * pre-dry: 4 hours at 70°C (between 70-80°C): no blisters
 +    * If using the window: add shims: 3 on each side.
 +    * heater 70% (and 75% at the edges)
 +    * 125 sec heating 
 +      * (without peeking in between)
 +      * This results in ±168°C: nice and flexible.
 +      * Sheet forming temperature: 150 - 175°C. At 150°C, the sheet is not very flexible yet
 +    * 60 sec cooling
 +
 +
 +==== Medium Gauge Film ====
 +  * 0,15mm
 +    * profile: 1mm PET (heater 85%)
 +    * heating: 8 seconds
 +    * vacuum: manual operation: start-stop technique to avoid holes if there are large cavities
 +
 +  * Polypropylene sheet: 1mm
 +    * No profile saved
 +    * Heaters at 50%
 +    * Heating: ±70 sec. Ready when sheet starts pulling flat. Might be ready much earlier too, but these values are the ones we used for testing. The plastic is very stretchy and blew holes in tiny cavities. So maybe better less heat. 
 +----
  
 ===== Troubleshooting ===== ===== Troubleshooting =====
-=== Sheet pulls itself out of the clamping frame ===+==== Preset loading gives wrong values ==== 
 + 
 +Reason of problem: touch screen input is too fast for the slow computer (PLC) 
 + 
 +Fix: 
 +  * **Use firm, deliberate presses with your finger** (not a stylus or fingernail). 
 +  * Don’t try to be too fast. 
 + 
 + 
 +==== Sheet pulls itself out of the clamping frame ====
 //Formech//: The material is presumably not reaching the correct forming temperature, so the sheet is far stiffer than it should be, making it hard to pre-stretch the material and also as the tool comes up on the table the inflexibility of the material requires much more clamping force on the clamp frame. This is why the sheet is pulling out. If you are using the full forming aperture then you will have better clamping, providing your machine has the 8mm round silicone bead seal as shown below. //Formech//: The material is presumably not reaching the correct forming temperature, so the sheet is far stiffer than it should be, making it hard to pre-stretch the material and also as the tool comes up on the table the inflexibility of the material requires much more clamping force on the clamp frame. This is why the sheet is pulling out. If you are using the full forming aperture then you will have better clamping, providing your machine has the 8mm round silicone bead seal as shown below.
  
Line 198: Line 288:
 //Formech//: You could also try turning over the sheet several times during heating to try and replicate a double heater machine, so that the heat penetrates the sheet from both sides. //Formlab//: this method doesn't work easily on big sheets since it sags and becomes flexible. It's not easy to clamp again in the frame. Polycarbonate loses moest heat in the process. //Formech//: You could also try turning over the sheet several times during heating to try and replicate a double heater machine, so that the heat penetrates the sheet from both sides. //Formlab//: this method doesn't work easily on big sheets since it sags and becomes flexible. It's not easy to clamp again in the frame. Polycarbonate loses moest heat in the process.
  
-=== Blisters appear on the surface ===+==== Blisters appear on the surface ====
 There is moisture in the sheet. At the point the blisters appear, the sheet is not hot enough to form yet. You'll need to dry the sheet or switch to a non hygroscopic material. There is moisture in the sheet. At the point the blisters appear, the sheet is not hot enough to form yet. You'll need to dry the sheet or switch to a non hygroscopic material.
  
 +==== Pre-stretch button does nothing ====
 +  * Turn off air supply
 +  * Turn off Formech
 +  * Wait ±1 minute and turn Formech back on. 
 +  * If you can hear the relay click, it works and the air supply can be opened again.
 +
 +==== Heater timer doesn't count down ====
 +  * Enable the heater. (The timer doesn't count down when the machine is cold)
  
  • formech_1372/formech_1372.1592903130.txt.gz
  • Last modified: 2020/06/23 02:05
  • by formlab