On 19/11/2013 14:45 Mathew Newton wrote:

On Tuesday, November 19, 2013 8:19:16 AM UTC, The Medway Handyman wrote:

Angle grinder sparks aren't very hot, not enough thermal mass or summit.

If only. My Dad's lounge window was permanently scarred with hundreds of pits by hot sparks from an angle grinder being used on a car several metres in front of it.

+1 (though not hundreds of pits) when an angle grinder was used (not by
me!) to cut paving slabs on the garden 3M in front of patio doors.

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F