120V Heatbed: Difference between revisions
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*'''[[Insulated Heatbed]]''' | |||
*Hackaday article - [https://hackaday.io/project/8671-110-230-v-pcb-heated-bed] | *Hackaday article - [https://hackaday.io/project/8671-110-230-v-pcb-heated-bed] | ||
Revision as of 03:11, 27 April 2019
About
- OSE Reasons for using a nichrome 120V bed are scalability and lower cost for large beds.
- Reason for DIY nichrome beds is clear for larger beds on the basis of cost.
- Sound design is required a safe method:
- Do not use parts that melt at low temperature. Thus, use Nichrome C wire and braided fiberglass insulation.
- For connection, use high temp 200C wire, and simply wind them around each other. But wait... How to Connect Wire to Nichrome Heaters.
Sourcing
Pad
- Ultimaker beds are 500W - - [1]
- 8" bed on amazon is $84. [2]
- 8" bed on Aliexpress is $45 - [3]
- Expensive 12" on amazon - [4]
- Silicone rubber sheet - to 450F - [5] - $6/sf
- 10x10" heatbed aliexpress 500W - $10 - [6]
- 200W 8x8, $13 - [7]
Silicone Rubber Sheet
Double Sided Tape
- $3/sf - [10]
Single Sided Tape
- Kapton tape, 4"x100ft - $25 - [11]
- Enough for 300 small beds (4"), or 33 12" beds.
Coated Nichrome Wire
- Need 30 Ohms of wire, about 10' long
- See Nichrome Wire
Uncoated Nichrome Wire
- Need 30 Ohm resistance for the length of wire at 120V to get 480W, for P=IV, V=IR, I=V/R -> P=V^2/R = 120^2/30 according to Electrical Power Calculator.
High Temp Nichrome in Fiberglass
- Claim of 1200C - [12]
Sleeving
Rope Heater
- Up to 500C - [15]. Description: helical winding around core material, then insulating sleeve.
Helical Nichrome Coil
- Can be stretched - [16]
Carbon Fiber
- Carbon fiber is also used as a heating wire - [17]. Interesting. But it appears it can only do 15W/meter? Why is it limited? Limitation appears to be encapsulating materials - [18]
Example of a DIY Nichrome Heater
- Idea is to wind Nichrome around an inner core, as otherwise, the heater element gets too long. That is just a practical consideration for these types of heaters if running high voltage.
- Here is 31 ga and 19 feet - for 90W - at 115V. [19]
- Here is another at 12V, with 16 gauge - 10' long, going up only to 225C. [20]
.
Derivative for OSE + Calculations
- 31 ga, 19 feet long above
- Power to bring 31 ga up to 2000F is under 4A - so with full 500W, 31 ga wire would probably blow up. [21]. Need to go thicker to handle the power.
- See Electronics Stack Exchange - [22]
Links
- Insulated Heatbed
- Hackaday article - [23]