Chip formation
Visible chips carry heat away. Fine dust or smeared edges can signal rubbing.
Support
Acrylic needs close support against vibration; polycarbonate tolerates impact better but still softens with heat.
Cooling choices
Use only coolant or lubricant methods approved by the tool and plastic manufacturer.
Method for this decision
- Identify the plastic and its approved blade or tooth category; do not assume one plastic behaves like another.
- Clamp or support close to the cut, leave protective film where appropriate, and set a continuous feed.
- Inspect chips and the kerf: dust, glazing, smear, or a melted edge means heat is not leaving effectively.
Worked example
Example: acrylic can crack from vibration while PVC can smear from rubbing. A sharp application-matched blade and close support address different failure modes; changing only RPM may not fix either.
Limits and stop conditions
Do not add coolant or lubricant unless the tool and plastic maker allow it. Ventilation, guarding, and cleanup remain necessary because hot plastic, chips, and fumes can create hazards.