LINEAR EXPANSION ?

[rustynut]

I've seen these guys put a steel rim on a wooden wagon wheel. They heat it up and slip it on, then quick cool
I guess to keep from burning the wooden wheel any more than necessary ?...Was wondering how much expansion to expect and how to calculate it ?.......any one know about this ?
thanks
rn

 

[jeffesonm]

I have no idea but whatever you're making sounds cool and I want to see pics.

 

[semipro]

Maybe try this. There's a link to an online calculator there also.
http://www.engineeringtoolbox.com/linear-expansion-coefficients-d_95.html

 

[DAKSY]

http://www.engineeringtoolbox.com/linear-thermal-expansion-d_1379.html

 

[peakbagger]

Used to do it to bearing races on shafts, heat up race, slide it on shaft and once it cools, it isn't coming off.

 

[rustynut]

just got to wondering just how much expansion would result when heating up a piece of steel.....have done the race thing b4 and know it works.
Have to go thru that formula and have a look......thanks.......rn

 

[WES999]

I deal with this at work frequently, we do rubber molding.
If you put a room temp metal part into a hot mold(300) it will expand, and you need have enough clearance so it will not
get stuck.

example:
Take a 3 foot dia (36 in) steel wheel rim, heat it from room temp 75 to 1000 how much does it grow?
change in temp 1000-75=925

Thermal Expansion Coefficient of: steel 7.3 (microinch/(in oF)) or 0.0000073 inch

L = Linear Expansion
L1 = Initial Length

= Coefficient of Linear Expansion of the Material
T1 = Initial Temperature
T2 = Final Temperature


0.0000073 inch x 36 in x (1000-75)

0.0000073 inch x 36 in x 925
=.243

So the rim will grow by almost 1/4 in, 36.243

 

[rustynut]

their is a use for all that math!.........that's what I was looking for......thanks......rn

 

[rustynut]

WES999,.......looking at your formula I have a question.......wouldn't the L1 (initial length) be the circumference ?

 

[rustynut]

pardon....... I plugged in the circumference and worked thru only to find your answer....... thanks......rn

 

[sportbikerider78]

Typically, the easy way to do this (if your material is steel) is look up a pipe growth calculator.

 

[rustynut]

handy site.........thanks