removing paint from guide bar or tip

[MyUsername]

That ultra thin layer of paint is not going to cause any measurable heat retention. ...anyway, once you use a bar a few times, paint is going to burn off any hot areas of the bar all by itself.

 

[thomas1]

,

Holding heat in?

So, if you took the bar off completely, the cylinder would instantly be 25° cooler?

 

[Deets066]

This is what came up when I tried to reply to Thomas 1's post??

 

[Deets066]

The paint or clear probably won't let the bar dissipate heat as well. The bar being measurably hotter will transfer more heat into the saw over a given period of time.

Not sayin I'm gunna take a grinder to all my bars now though

 

[Deets066]

So, if you took the bar off completely, the cylinder would instantly be 25° cooler?

No

 

[thomas1]

View attachment 34825

This is what came up when I tried to reply to Thomas 1's post??

I deleted it. The premise that removing paint from the bar will make the saw run cooler and putting that forth as science was making my brain hurt.

I wasn't quick enough and you guys replied, though.

 

[mdavlee]

I've had some of the tsumura get gummy and look like burnt sugar on the edge after a 9 or 10 minute long cut even with oil dripping on the tip. After that scraping it off was how I had to get the sawdust and crust off.

 

[thomas1]

The paint or clear probably won't let the bar dissipate heat as well. The bar being measurably hotter will transfer more heat into the saw over a given period of time.

Not sayin I'm gunna take a grinder to all my bars now though

So, if the paint is stopping the heat from dissipating, removing the bar completely should eliminate that heat storage, correct?

The bar is never going to transfer heat to the cylinder unless it's hotter than the cylinder.

 

[Keith Gandy]

So, if you took the bar off completely, the cylinder would instantly be 25° cooler?

Im assuming a painted bar would hold the heat in generated by friction which by conduction is transfered through the bearing , sprocket, crankshaft, bearing, and case?

 

[mdavlee]

Im assuming a painted bar would hold the heat on generated by friction which by conduction is transfered through the bearing , sprocket, crankshaft, bearing, and case?

Possibly. I've not seen a problem with heat at 500°+ by contact reading on the exhaust side fins of the cylinder when milling. Finding the optimum temperature for power would be nice. Dyno time and a fan or heat gun may be needed for that.

 

[Keith Gandy]

I look at it like this, if u have a nose sprocket goin bad and no oil goin to the bar and the bar blues up and overheats the needle bearing which in turn heats the crankbearing? Ive seen what happened on a 261 from that exact scenario in which the needle and crank bearing let the piston eat the cylinder up

 

[thomas1]

I look at it like this, if u have a nose sprocket goin bad and no oil goin to the bar and the bar blues up and overheats the needle bearing which in turn heats the crankbearing? Ive seen what happened on a 261 from that exact scenario in which the needle and crank bearing let the piston eat the cylinder up

Yep, the friction is generating heat. Paint doesn't generate heat.

 

[Keith Gandy]

Yep, the friction is generating heat. Paint doesn't generate heat.

I am wondering about the temp difference between the bar and cylinder. If the bar got too hot it would transfer the heat to cylinder ?

 

[Keith Gandy]

Yep, the friction is generating heat. Paint doesn't generate heat.

I think the clearcoat or paint will hold heat in. Any barrier between the bare metal and air will insulate?

 

[Brush Ape]

Anyone just cut wood anymore without being worried about oil, bar temp, rpm from spark plugs, etc?

I don't worry about nothin'

worryin's a waste of my ....... time.

 

[thomas1]

I am wondering about the temp difference between the bar and cylinder. If the bar got too hot it would transfer the heat to cylinder ?

The temperatures are always going to attempt to equalize. Hot on one side, cold on the other and somewhere in the middle is the point of equilibrium.

 

[thomas1]

I think the clearcoat or paint will hold heat in. Any barrier between the bare metal and air will insulate?

That same paint barrier exists at the tail of the bar. If it's insulating the bar from the air why isn't it insulating the bar from the case of the saw?

 

[Deets066]

I deleted it. The premise that removing paint from the bar will make the saw run cooler and putting that forth as science was making my brain hurt.

I wasn't quick enough and you guys replied, though.

I'm just thinkin out loud and believe me when that happens there is no science involved

 

[Keith Gandy]

That same paint barrier exists at the tail of the bar. If it's insulating the bar from the air why isn't it insulating the bar from the case of the saw?

The chain is contacting the bare rail and groove and the bare sprocket to bearing to crankshaft to bearing

 

[Keith Gandy]

Its pretty simple the way I see it. If u paint the coils on a AC condensor coil, will the painted coil release as much heat to atmosphere as a bare coil?