removing paint from guide bar or tip

[Keith Gandy]

surrounding cooling air just like a radiator or cooling fins

Yep

 

[Keith Gandy]

It's got to get from the bar to the air, no? So the surface of the bar should be the hottest measurable point, correct?

Let me put it in terms you can relate to. If I'm cooking a batch of triple fudge brownies I heat the oven to 350°. The oven is acting as an insulator. I take a temperature reading on the outside surface of the oven, it reads 85°. If I remove the insulation, by opening the door, and take a reading on the inside it's going to be very close to 350°. It's not magically going to now be 45°, like my glass of milk.

The heat from the bar dissipates to the cooler surrounding ambient air. If its powdercoated, which insulates better than paint, it will be a barrier between the metal underneath and the cooler air which will make it resist dissipation

 

[Definitive Dave]

It's got to get from the bar to the air, no? So the surface of the bar should be the hottest measurable point, correct?

Let me put it in terms you can relate to. If I'm cooking a batch of triple fudge brownies I heat the oven to 350°. The oven is acting as an insulator. I take a temperature reading on the outside surface of the oven, it reads 85°. If I remove the insulation, by opening the door, and take a reading on the inside it's going to be very close to 350°. It's not magically going to now be 45°, like my glass of milk.

true but it should instantly be cooler to some measurable degree
AAAAANNNNNDDDD
if you bring ice cold milk we can have brownies together

 

[MyUsername]

You guys need to get laid

....I would also tend to think that anyone posting almost 3,000 posts on a forum about chainsaws(that's only a few months old) .....may also kinda need to get laid also

...just keeping with the comedy theme of this thread which started at post #1

 

[thomas1]

The heat from the bar dissipates to the cooler surrounding ambient air. If its powdercoated, which insulates better than paint, it will be a barrier between the metal underneath and the cooler air which will make it resist dissipation

That same insulation barrier is present when the temp readings are taken. It can't simultaneously stop the heat from escaping the bar and release the same heat for a temp reading.

 

[thomas1]

true but it should instantly be cooler to some measurable degree
AAAAANNNNNDDDD
if you bring ice cold milk we can have brownies together

Not cooler than the outside though, correct?

 

[Magnumitis]

That same insulation barrier is present when the temp readings are taken. It can't simultaneously stop the heat from escaping the bar and release the same heat for a temp reading.

^^^this^^^

 

[Keith Gandy]

That same insulation barrier is present when the temp readings are taken. It can't simultaneously stop the heat from escaping the bar and release the same heat for a temp reading.

Only thing I can think of Thomas is with the powdercoating on its really hot underneath and leaching through on his reading but with it stripped it cools quickly to the point of being less. I really dont know but I dont think Redbull would lie and 60° is alot. Remember in his test of all the bars Cannons ran cooler? No finish on Cannon bars

 

[Definitive Dave]

tired now, brain hurts where are my damn brownies, I WAS PROMISED BROWNIES!!!!!

 

[hseII]

Painted or powdercoated? Id say a painted GB bar would run cooler than a powdercoated Stihl ES

For about 30.

Them your GB bar will be the "unpainted".


Sent from my iPhone using Tapatalk Pro

 

[hseII]

That same insulation barrier is present when the temp readings are taken. It can't simultaneously stop the heat from escaping the bar and release the same heat for a temp reading.

I bet the wood is hotterer.


Sent from my iPhone using Tapatalk Pro

 

[Keith Gandy]

I wonder if one was to take a cylinder and powdercoat it, would the engine temperature go up? Theres a reason they leave the cylinder and fins bare on an air cooled engine?

 

[Keith Gandy]

For about 30.

Them your GB bar will be the "unpainted".


Sent from my iPhone using Tapatalk Pro

Ya after 1 use the GB should run really cool?

 

[thomas1]

I wonder if one was to take a cylinder and powdercoat it, would the engine temperature go up? Theres a reason they leave the cylinder and fins bare on an air cooled engine?

If you put an insulating layer on the outside the internal temperature would likely rise and the external surface temp would go down.

 

[MyUsername]

I have many electric brushless RC cars and trucks. I use IR temp guns to check motor can temps to set up proper gearing. I remember a few years ago reading, (more than once) on RC forums, that different finishes on metal motors can affect temperature readings. Different colors/painted any shiny surfaces can give different temp results. I think IR Guns can't always measure temps properly on shiny surfaces. I tried to search for some of the discussions that I read, but couldn't find them. But I did find this...
http://www.raytek.com/Raytek/en-r0/IREducation/Emissivity.htm

This write up seems to say that you'll get the most accurate temperature reading of a shiny surface if you paint it black.

 

[Keith Gandy]

If you put an insulating layer on the outside the internal temperature would likely rise and the external surface temp would go down.

I see what u r getting at but I cant anwser other than the explanation I gave awhile ago. If factories know the bare cylinder dissipates heat better than the same should apply to a bar? I see what your question is with the original reading with the powdercoating on but I think the temp is so great underneath that its reading really high on the outside. The powdercoating isnt gonna be a total thermal insulator. It would be interesting to see internal groove temps with powdercoating on and off

 

[Keith Gandy]

I have many electric brushless RC cars and trucks. I use IR temp guns to check motor can temps to set up proper gearing. I remember a few years ago reading, (more than once) on RC forums, that different finishes on metal motors can affect temperature readings. Different colors/painted any shiny surfaces can give different temp results. I think IR Guns can't always measure temps properly on shiny surfaces. I tried to search for some of the discussions that I read, but couldn't find them. But I did find this...
http://www.raytek.com/Raytek/en-r0/IREducation/Emissivity.htm

This write up seems to say that you'll get the most accurate temperature reading of a shiny surface if you paint it black.

Very interesting

 

[hseII]

Ya after 1 use the GB should run really cool?

Yes.

Sent from my iPhone using Tapatalk Pro

 

[WOODS]

FWIW I have never owned a vehicle that didn't have a painted radiator. Evaporators and radiators serve reverse functions. The former collects heat from the outside air and transfers it to the circulating refrigerant; the later collects heat from the circulating coolant and transfers it to the outside air.

I don't know if a chainsaw bar acts as a cooling fin or a heat source in normal applications as I don't know the temperatures of each component, but the principles T1 raise are correct - heat moves to the cool. Gloss surface reflect more and dull surfaces absorb more. Interesting test would be operating chain temperatures on a clear coat bar, a flat black bar and a bare bar. Same test for temperatures at bar mount.

Ron

 

[Red97]

Take an old guide bar and dimple it wit a punch, bet the ir gun temp reading will be a good bit different that the smooth bar...