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So I was about to install my new Summit crankshaft damper and something didn't look right to me...
This would have sucked. I mean it's not a lot but hell it's not zero either.
Contacted summit, they're sending out a new one. Couldn't ask for better customer service.
First thing, no machinist uses calipers to measure anything precisely. The first measurement is +- .002 which is probably in spec if using micrometers. Calipers are good for rough measurement but precision? No way.
I don't think you will find one that is perfectly machined.We use laser lining to align pulleys and hubs at work and NEVER use the hubs for a mounting area for the alignment tools.We always use the motor or pump shafts as the hubs are never machined true to the bore.I have seen over .100 difference on some and alot of them turn way more RPM than your car will ever see,No issues as long as it is mounted correctly
I agree about using calipers instead of mics, but that's all some people have. In my opinion as a lifetime T&D Maker, this is much ado about nothing. If it's balanced, it's balanced as a complete assembly. Plus, the diameter you're measuring isn't a working diameter. The serpentine grooves pitch diameters are what's important. They're like a thread. The major diameter isn't the working diameter, and can runout considerably (within reason), and it doesn't matter. The pitch diameter is the working diameter, much like the serpentine grooves pitch diameter. Hope this is making sense.......
Last edited by grinder11; Jun 27, 2022 at 05:42 PM.
measuring the belt-grooves trueness to the centerline is a much more complicated matter. You want balance obviously, but you don't want your belt whipping out of round at 7000rpm
I kind of laughed a little at the measurement techniques being used here to "prove" a balancer is bad.
Try taking it to a machine shop and have them check the balance if you want to do a useful measurement. They could also dial indicator the belt grooves for you and tell you the run-out.
Used calipers as a visual reference for you lot.
I chucked my "balacer" in a lathe and indicated off a shaft
This balancer is a mess. The replacement they sent is 2 though out which I'm ok with.
Lol you guys....
summit harmonic imbalancer
