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Originally Posted by m102404
Some PTW questions...
Some of it's a bit noobish...sorry.
I have a PTW motor...I'm pretty sure it's a 480. I can't recall or find the post that I think McGuyver made that described how to tell one from another. It might not even be on this forum (vs. Systema forum, etc...). If someone knows off hand how to tell a 480 vs 490A vs. 490B apart...please let me know or point me to the right thread.
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If you have a picture of the motor, I can tell you what it is, approximately when it was made and the winding type. 11t is 490a and 14t is 490b as stamped on the amrature.
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On one of the motors I have the brushes are worn about halfway through and are starting to look pretty raggy where they contact the comm. The comm looks pretty good...no nicks/scores/gunk (inspecting through the brush hoods with the brushes out). How long can you go with the brushes before they're done? Just use them until they stop working...or is there a don't use past this point sort of thing like a brake pad? I don't know that I've ever actually worn out a set of brushes.
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If it is a 490, you should replace the brushes when they are half worn, or when the brush spring is at 90 degrees to the hood. You only need brushes for the 490. For the 480, you need a brush hood set, as well as brushes. Or you can harvest those parts off a dead motor if you have one available.
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When it comes time to replace them, if I understand things right I'm going to need to replace the brush hood with a 490 brush hood and get 490 brushes? Is that correct...and what's the local Canadian source for them (DoubleTapTactical?))
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Chris can get you the brushes, I think he normally stocks them.
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Re. getting/building another PTW...and I have not kept up with all the generations of Systema builds.
Are the Systema SCK's still hit and miss high lemon rate thing? Do the issues stem from electronics and motors or actual fit and alignment of the rest of the parts?
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Current problem with 2012, outside of the motor, is the cylinder shell. But that is not an issue if you use an older cylinder. Kits have always had off-spec parts, and nothing in my experience has made me change my assessment over the years to avoid the kits, unless you have them properly assembled and the off parts replaced or modified.
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Are the electronics/motors compatible between 2008 and current SCK's. Not mix and match per se but rather using one set in lieu of another. i.e. I have a bunch of extra 2008 boards, spare motor and mechbox....I know all those work. If I have issues with the current SCK will the 2008 board fit the current body...will the motor...etc..? Or have they changed the dimensions somewhere (I remember reading something about that a while ago).
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Everything is compatible, except older cylinders in the Supermax. One thing you can count on is that after Gen 1, all dimesions are the same. I can take a 6 year gearbox and it fits perfectly in a 2012 body.