Installation tips

Cartridges must be fitted as tightly as possible.

When preparing to drill holes for placing the heaters, consider the following factors:

  • The inside of the bore must be smooth, without scratches or variations in diameter, no matter how small; finishing with a reamer is recommended.
  • Heat rises
  • Dissipation is greater at the ends and heat will concentrate in the center.
  • Choose stock cartridges between 8 to 11 W/cm2
  • Try to make the drill have an outlet to facilitate easier disassembly
  • Connections must never be inside the hole, as they risk crossing or burning.
  • Connections must be protected to avoid possible drops of liquids, plastics, gases, etc.
  • It is recommended to incorporate probes that should be at a maximum of 15mm from the resistor, connected to a temperature controller.
  • Cartridges must have a minimum separation between them of 3 times the cartridge diameter.

- Extraction

If possible, a hole should be drilled at the opposite end of the connections to facilitate easier extraction of the cartridge.

1. Drilling for extraction

2. Mold

3. Resistance



- Physical characteristics of solids
Material p Fusion Cp Cf
Steel 7.8 1400 0.12 60
Aluminium 2.7 600 0.23 94
Bronze 78.4 900 0.10
Casting 4.2 1150 0.13 30
Stainless Steel 7.8 1600 0.12 56


- Example of heating a cutting blade

1. Resistance

2. Probe

3. Maximum 15 millimeters

4. Maximum fit

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