CS 70 motor problems

D

Dagobertono

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Joined
May 8, 2020
Messages
1
Hi.

I have a CS 70 table saw that gets small bursts/spikes in rpm and excessive sparking. The carbon brushes looks good with plenty of meat left on them. I have messured the ohm on the commutator on side by side an opposite and i messsures consistent. I have sanded and polished the commutator. I have re-seated the brushes. Still it behaves more or less the same. Maybe a little better. Could my brushes be lemons or is this signs of a more «sinister» problem?could it be a bad mosfet ect? The speed dial works. 

Anybody have anybideas?
 
Hi, I have the same problem , Can't afford to send it back to festool , again the brushes look okay and the are well seated . Did you ever find the problem ?
 
TS55s, CTs, and other Festools that act funny but appear to have good brushes are usually resolved with new brushes.  Most owners are surprised as just how long a new brush is compared to what they take out of the tool, even though the old one still "looks good".

A new set of brushes should be easy enough to procure, replace, and rule out as the issue.
 
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