On 07/04/2021 18:58, George Miles wrote:
Not often you see mains ones... [1]
But if a it got hot enough to short an armature winding, then yup it may
still spin but will be really rough, lack power, and you may see lots of
sparks from the commutator.
So check the brushes, and if those look good, suspect the armature.
Looks like they are fairly cheap to replace.
I would expect the process to be similar to what I did on my SDS:
http://wiki.diyfaq.org.uk/index.php/Makita_HR2450_SDS_Drill_Armature_Replacement
[1] the extra control electronics in the modern battery ones will
usually shut them down if things get too hot, before damage occurs.
--
Cheers,
John.
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