# Fire — programmable electric furnace, kiln and forge

Fire is a proposed repairable thermal-processing platform for local fabrication:
controlled heat, a chamber matched to the work, and a record of the whole batch.
It develops the existing common-furnace and kiln/forge sketches into a dedicated
project. It is currently a design preview, without built or rated equipment.

## Design basis and boundaries

The operator selected Fire as a programmable furnace/kiln/forge on 2026-10-27
and requested publication with Air/Water styling, past notes and an Open Source
Ecology direction. The workshop inventory explicitly calls for metal kilns,
forges and ovens for glass and metal; a CNC note proposes a common furnace;
the pizza/bread oven note asks about resistance and induction heating.
These are architectural seeds, not qualified furnace drawings or firing recipes.

Fire owns thermal equipment, process planning and batch temperature/energy
records. Earth supplies characterized material. Batteries owns energy storage;
its pack design does not establish the converter, service or sustained power
available for a furnace. Historical Tesla/Lyne experiments contribute logging
and measurement ideas only; no anomalous power source is assumed.

## Proposed architecture

- A serviceable frame and enclosure, with a replaceable insulated hot-zone module.
- A resistance-heated chamber as the initial architecture to develop for general
  chamber heating. Element, lining, crucible and sensor selections depend on
  temperature, atmosphere, charge and duty; no final maximum temperature is rated.
- Removable shelves, hearths or crucibles selected for their particular process.
  Glass, ceramics and metal processing require separate qualified contact parts
  and recipes. Food equipment is separate from contaminated workshop hot zones.
- A ramp/hold/cool program and temperature log, with material/batch identity,
  sensor location, calibration, energy, deviations and inspection results.
- Independent overtemperature cutoff and power isolation, separate from the
  software controller. Extraction, enclosure and electrical protection are
  designed for the actual charge and installation.

Induction is a separate development branch: matching converter, resonant parts,
coil/crucible geometry, cooling and protection. It is not a setting that turns a
resistance chamber into an induction furnace. OSE's 20–50 kW furnace discussion
is an architectural reference with stated goals, not evidence of a finished
machine and not Fire's selected power rating. Iron/steel melting is a later
research question, not an advertised capability of the first chamber.

## Public profile sketches

| Sketch | Target | Nominal ramp | Hold | Nominal cooldown |
| --- | --- | --- | --- | --- |
| Warm & dry | 120 °C | 2 °C/min | 30 min | 1 °C/min to 80 °C |
| Heat treatment | 550 °C | 4 °C/min | 45 min | 2 °C/min to 80 °C |
| Non-ferrous melt | 750 °C | 5 °C/min | 30 min | 3 °C/min to 80 °C |

These are original illustrative software profiles, starting at 20 °C, not
approved material recipes, measured temperature curves or equipment limits.
Actual workpiece temperature lags the sensor. Material composition, thermal
mass, atmosphere and phase changes govern the real schedule; passive cooling
does not guarantee a programmed cooling rate. The JSON download marks every
profile `illustrative-not-approved` and has no hardware-control endpoint.

## Energy planner

`heater allowance (kWh) = rated input (kW) × ramp-and-hold duration (h) × assumed duty`.
Cost is that allowance multiplied by the entered electricity tariff. This is
schedule arithmetic, not a heat-transfer or melting model. Cooldown time is
shown separately and is excluded from heater hours. Auxiliaries, actively heated
cooling, converter losses and standby use are not added. Assumed duty is editable;
the page never represents the resulting allowance as measured consumption.

## Open workshop direction

Use the GVCS principle of repairable machine modules: replaceable heater and
lining assemblies, standard sensors where appropriate, accessible power
components, a documented bill of materials and maintenance instructions.
Publish calibration methods, parts revisions and actual run records alongside
future CAD. Modularity does not imply interchangeability between incompatible
temperatures, atmospheres or contamination classes.

The initial downloadable module list has no quoted prices or whole-system
total. The immediate design queue is the first material/process envelope,
thermal and electrical sizing, lining/crucible selection, sensor placement,
independent cutoffs, and a measured reference load. Scale only from those results.

## Public references

- https://www.opensourceecology.org/gvcs/
- https://wiki.opensourceecology.org/wiki/Induction_Furnace_Overview
- https://wiki.opensourceecology.org/wiki/Open_Source_Induction_Furnace

Reviewed 28 October 2026. Historical source claims do not establish equipment ratings.