Pelt Preload Method

CoolROD · 08-21-2003, 08:58 PM

Can I use torque and the pitch angle of the screws between the cold plate and the waterblock to set pelt preload?

I have a teflon washer under the head of the button heads, and I can lubricate the threads. I will have to build a torque wrench small enough...

How is everybody else doing it?

iggiebee · 08-21-2003, 10:16 PM

First, it would extremely helpful if you would lap the peltier. IMHO they all have horribly uneven surfaces which will [edit] increase even further the inefficiency of the pelt.

I have not used a torque screwdriver simply because I did not have one. I belive pelts call for 200 pounds per sq inch.

What I did was to tie the screws slowly and evenly, making sure I always shifted to next screw diagonally opposed. It's working like a charm achieving between 20 to 25 C below below ambient temperature (what ever unscientifically may be).

CoolROD · 08-21-2003, 10:34 PM

OK thanks, I will look at the flatness. I am going to try and hit the manufacturer's spec'd preload, but I still want to know how other people are doing it.

08-21-2003, 08:58 PM	#1
CoolROD Cooling Savant Join Date: Mar 2003 Location: North Carolina, USA Posts: 225	Pelt Preload Method Can I use torque and the pitch angle of the screws between the cold plate and the waterblock to set pelt preload? I have a teflon washer under the head of the button heads, and I can lubricate the threads. I will have to build a torque wrench small enough... How is everybody else doing it? __________________ Jack of all Trades, Master of None. Last edited by CoolROD; 08-21-2003 at 09:08 PM.

08-21-2003, 10:16 PM	#2
iggiebee Cooling Savant Join Date: Jun 2003 Location: Miami, Florida US Posts: 117	First, it would extremely helpful if you would lap the peltier. IMHO they all have horribly uneven surfaces which will [edit] increase even further the inefficiency of the pelt. I have not used a torque screwdriver simply because I did not have one. I belive pelts call for 200 pounds per sq inch. What I did was to tie the screws slowly and evenly, making sure I always shifted to next screw diagonally opposed. It's working like a charm achieving between 20 to 25 C below below ambient temperature (what ever unscientifically may be). __________________ I stop for 1 C. "Those that give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." -- Benjamin Franklin (1773) Last edited by iggiebee; 08-22-2003 at 12:05 AM.

08-21-2003, 10:34 PM	#3
CoolROD Cooling Savant Join Date: Mar 2003 Location: North Carolina, USA Posts: 225	OK thanks, I will look at the flatness. I am going to try and hit the manufacturer's spec'd preload, but I still want to know how other people are doing it. __________________ Jack of all Trades, Master of None.

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