As the Connecting Rod Turns, episode 1 . . . . . . .Now that the epoxy fumes have cleared out of my brain, I've had some time to peruse what is obviously a pre-production, "approval print" to be put in front of ? ? ? . . . . .
Some of my observations, which address some concerns, follow:
Shows 74.8 across the flats big end, into a 75mm bore!!?? Like IO says.
Jack,
See my comments below:
Hypotenuse of 79.25 - I need more detail.
Transpositionalerrormidget . . . . . . . A/ Hypotenuse of 74.8mm x 27.0mm IS: . . . . . 79.52mm AAAhhhhmmm, please explain
your number.
2/ ADDITIONALLY: Your numbers and interpretation are not what is drawn on the "print". The big end does not have a simple rectangular section. It is notably narrowed, although that width is: "unspecified",
the resulting hypotenuse is significantly smaller.
d/ Did anyone notice the 3mm tapered drilling specified in the left view? ? ? The purpose of this "center hole" is no doubt to provide an "anchor point" for radial turning of the big end to: 74.8mm Ø ! ! !
Viola! Fitment through 75.0mm bore now is a moot point, especially when combined with the large "cheek reliefs" shown on the drawing. I realize that the "print" is unclear about this dimension. That is
what "approval prints" are about. Communication ironed out at both ends . . . . . . .
z/ If we further postulate that the designers at Saenz know what they are doing, have made rods before, and accept communication to allay client fears, well then, no problem.
I recommend a Collegiate level Engineering Graphics Course for those who wish to gain expertise in interpreting "prints". Take one that includes Geometric Tolerancing pratices.
https://www.google.com/search?q=geometric+tolerancing+examples&rlz=1C1CAFB_enUS728US730&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwiAgoG7rpbZAhVrtlkKHVA4AtkQsAQIOw&biw=1920&bih=949Not every racer needs to be an engineer. But we all need to understand "engineer speak" and "engineer show & tell" or we end up with bright, shiny, new, useless, expensive bits. And if we are too critical, we end up friendless as well . . . . . . .
JMHO . . . . . Voiceofreasonboy