I have one in the oven at 400°F, will take it out in half an hour. Flywheel has been in the freezer for several hours. Will they go together?
Or am I ?
Or am I ?
weirdest damn meal everWhat are ya making?
Trying to make a new ring gear go on a flywheel.What are ya making?
Your premise is correct, but not the conclusion. The steel will indeed expand equally in all directions, by a percentage per degree. So, across the width of the gear, you will get, say, 5% expansion for a certain temperature rise. Same with the thickness. The other dimension of a ring, though, is circumference, and you will get the same 5% expansion of the entire circumference. That will make the hole bigger, by a lot, because the circumference is by far the largest dimension of the part, so you get the largest amount of expansion for the given %. Make sense?When symmetrically heating a steel part like Al did, that's not already installed on a shaft, the steel will expand in all directions. It doesn't magically know there's a hole in the middle and to only expand away from the hole. Therefore the hole shrank. I could see heating the outer portion of the ring gear which in theory would expand and pull the cooler, inner portion (the hole) out with it.
I believe the most effective way to fit the part is to dry ice the "shaft" part, like Twindows said, and press it in an ambient "hole" part. I've successfully pressed many parts this way.
Not really. What I'm saying is that the metal expands by a uniform percentage in all dimensions, and the longest dimension will have the greatest amount of expansion for a given percentage. (5% of 100 is a lot more than 5% of 2.) The longest dimension of the ring is the circumference, being analogous to the length of a long skinny part. So the largest absolute amount of change occurs at the circumference. Yes, the outside circumference will change by a bit more than the inner circumference, but this is inconsequential. Of course by the nature of circles, a change in circumference is directly related to a change in diameter.So you're saying the uniform heat will expand the hole because its circumference is smaller than the outside diameter (ring gear teeth portion) circumference?
Due to my failure with about a 400°F difference in temperature, I'd probably like to try the dry ice for the flywheel, and still heat the ring gear to 400 in the oven. I need as much temperature difference as I can get.Thermal expansion equation. I'd still not bother heating the gear and dry ice the shaft part.
And all because I wanted to know if it would work. And it didn't.Lots of nerd talk in here.