Any reason not to bake a rotor @200' for 1 hr?

Status
Not open for further replies.
G

gtsun

Joined
Sep 21, 2009
Messages
1,609
I cleaned up a stock rotor that's been ground & drilled, now I want to paint it & was going to use High temp (500') engine/caliper paint. It's good stuff but needs to get up to 200' for one hour to cure fully. I have a shop oven we use for things like this so know ones cup cakes will get stinky but is it ok to heat a Norton rotor to 200' for a hr??? I'm sure they get hotter during use but not sustained that long.. What say you more metallurgicaly knowledgeable folk?
 
What is the point of painting it? It is inside the primary chain case, and not visible unless you are running an open case. It is bathed in oil, so will not corrode.

The clearance between the rotor and stator is only about 0.005 inch...paint could reduce that by 1/2.

I doubt the rotor might experience 200 F temp in normal use. I would worry that elevated temp might affect the magnetism.

Slick
 
I was wondering more about the magnets than the metal that they are mounted in. Unfortunately I have no insight for you on this gtsun, other than maybe using another type of paint that doesn't need baking...are you running it dry with a belt drive?
 
Slick i think he means the brake rotor (brake disc) not the alternator rotor :oops:

I can't see that doing any harm as long as you build heat up slowly by starting oven from cold with disc in not putting a cold disc into hot oven. But more importantly let it cool slowly by just turning oven off an leaving door open a little with disc still inside. The temperature is to low to effect the metal but sudden heat or cooling thermal shock should be avoided. If there are problems with the disc warping then the chances are it would have wrapped anyway in normal useage with time at some point.
 
I read "ground and drilled" to mean trued up round, and balanced. Funny how the brain works sometimes.

Sure...200 F is no problem.

Slick
 
Duh ya ain't painting the friction surfaces so just go out and more/less practice brake skills w/o wasting electricity carbon and money. Paint in holes will be fine if dirty a long time after. Just because the paint ain't fully set up on first use don't matter a whitworth unless phyysicaly rubbed which better not happen any way.
 
I've seen the iron brake discs on my car orange hot (hotter than red hot). You could see them glow through the mag wheels.
It didn't cause any harm.
200 degrees doesn't sound like much, even if it's 200C.
 
toppy said:
Slick I think he means the brake rotor (brake disc) not the alternator rotor :oops:

I can't see that doing any harm as long as you build heat up slowly by starting oven from cold with disc in not putting a cold disc into hot oven. But more importantly let it cool slowly by just turning oven off and leaving door open a little with disc still inside. The temperature is too low to affect the metal but sudden heat or cooling thermal shock should be avoided. .
Click to expand...

Do you do all that when they get hot on a bike ride?
 
Triton Thrasher said:
toppy said:
Slick I think he means the brake rotor (brake disc) not the alternator rotor :oops:

I can't see that doing any harm as long as you build heat up slowly by starting oven from cold with disc in not putting a cold disc into hot oven. But more importantly let it cool slowly by just turning oven off and leaving door open a little with disc still inside. The temperature is too low to affect the metal but sudden heat or cooling thermal shock should be avoided. .
Click to expand...

Do you do all that when they get hot on a bike ride?
Click to expand...

No but i don't brake for an hour either. :D
Also its not my disc so i would treat it like that if i was doing it for him. If it where me i would just buy a new disc or uprated set up to improve brakes (i have updated them) but that was not the question asked.
 
Some olde cowboyes used Steam train firebox doors for machineing into brake discs, as theyed been heat cycled repeatedly -
red hot to cold ' one or two ' times , so were dimensionally stable / stress releved , as it were .
 
Matt Spencer said:
Some olde cowboyes used Steam train firebox doors for machineing into brake discs, as theyed been heat cycled repeatedly -
red hot to cold ' one or two ' times , so were dimensionally stable / stress releved , as it were .
Click to expand...

:roll: :lol: :?: :idea: :!: :shock: :|
 
Well since I'm using a very small oven it will take a little while to heat up. I will set in in and let it heat up slowly and monitor it as it sits. Cooling down to ambient temp will happen naturally by letting it sit. Not really necessary but it will cure the paint better. Not sure if the drilled disc will make much difference, I am running a Brembo MC with braided line & de chromed disc already. Should help in the wet at least.
 
Status
Not open for further replies.

Similar threads

Y
  • Locked
Is there any reason not to use Redline in the tranny
Replies
3
Views
1,303
BrianK
B
Back
Top