How did i cut a sewer pipe straight without cracking

DO NOT TRY THIS AT HOME! Make sure you operate your angle grinder by following all the safety rules mentioned in this video description:
How did I cut the pipe that is only partially excavated? Very easy. I show you how to cut the 6" clay pipe, it may work with the 4" clay pipe, if you take the  guard off, but that may be very risky, especially with a cheap blade.
Read and follow ANGLE GRINDER SAFETY first:
- Use the correct wheel for the machine’s size and speed, and the work to be performed.
- A cutting disc should NOT be used for grinding.
- The RPM rating of the disc/blade must be higher than that of the angle grinder.
- Adjust guards to deflect flying particles away from operator.
- Use an 180° guard between operator and wheel!
- Before use inspect wheels for cracks, defects and wear. Replace worn discs.
- Perform “ring test” as appropriate.
- Allow grinder to come to full speed and warm up before use and to a complete stop after use.
- Do not grind on the side of the wheel.
- Do not use liquid coolants.
- Always use two hands. Keep hands away from rotating wheel and avoid continuous vibration.
- Wear proper PPE including eye & hearing protection; leather gloves; natural fiber clothing; apron and respiratory protection as needed.
- DO NOT wear loose fitting clothing or have hanging strings.
- Maintain good footing, balance & work position.
- Do not carry grinder with finger on the switch.

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