Balancer to crank fit problem.
- Thread starter Flint
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Ya to me it looks horrible to me. I’d send it back too. Kim
I've had to skim .001-ish off every 440 Source balancer I've come across. No big deal. Interesting yours is too big for the crank snout.....chinesium at it's best.
When I got my damper from 440 source, pretty sure I read on the instructions where they make them SLIGHTLY undersized so they fit on a worn crank. I used blue indicating fluid on the crank snout to see the high spots and where the damper was rubbing. I used a light file on those areas and it fits like a dream.
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You're supposed to hone the bore of the Damper, not reduce the diameter of the crank.
Next time you try and fit someone else's damper on that crank fit, it will be loose.
Next time you try and fit someone else's damper on that crank fit, it will be loose.
65CopCar
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Agree. My neighbor has a Sunnen hone that we hone them on.
The problem is that most folks cannot measure the bore accurately. Many think they can measure the crank to a tenth, and most can't.
I am a metrology nerd (I do a lot of metrology coaching). I am comfortable saying that I can measure the bore to 0.0002" repeatedly. On a good day a tenth - maybe. I would use a 2 point bore gage set up with gage blocks. Also have internal 3 point micrometers and less accurate methods.
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I'm a Machinist and you have to develop a certain "touch" when you are setting your Mic from a Gage block.
Then you need to remember that same force when you measure a part. Dial bore gages take that out of the
equation, but not everyone has one. The 440 Source instructions clearly tell you to take the excess stock out
of the damper. This measuring stuff is not rocket science, but it does take some practice.
Then you need to remember that same force when you measure a part. Dial bore gages take that out of the
equation, but not everyone has one. The 440 Source instructions clearly tell you to take the excess stock out
of the damper. This measuring stuff is not rocket science, but it does take some practice.
It wasn't so much that I reduced the diameter of the crank snout, but rather filed burrs and high spots that were on there. That is why I used the indicating fluid to find the high spots as I indicated. I didn't file where it didn't need to be. I could tell by the initial fit that it was only hanging up on a couple of spots.
65CopCar
Well-Known Member
I have done gage R&R studies on od mic measurement on seasoned machinists. The results were scary bad. I'm not saying machinists can't measure. Its just that many were never taught the basics and are not good at it. Some excel at it.
My dad handed me a bore gage 49 years ago and said - this is how you do it. Now start measuring. We were making aerospace parts. His stuff is on the moon.
Flint
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Also how many people actually had any of their measuring equipment go through a PMEL lab to check the accuracy.It’s not just, oh I checked zero. It’s about being linear. Most likely wear on older quality brands and most likely drunken threads on cheap junk. Mine are old Starrett carbide faced and have been checked for accuracy. Measure several times before you call it.
65CopCar
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Don't get me started on calibration labs. We don't get along. I cannot count how many times I found calibration labs have a TUR (total uncertainty ratio) below 1, which means that item they are calibrating is more accurate than what they are calibrating with. I have many many stories. I actually got a quality manager removed from his role at a large manufacturer because of this - this started it but his attitude about the subject finished it.
The reason the labs get away with is is because the folks hiring them generally do not understand metrology and do not hold them accountable. The expectation is very low - send them the instrument for calibration and accept as gospel what comes back.
Flint
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I always just delt with USAF PMEL. They would check my privately owned equipment for me.
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