Kegerator construction
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AT
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jasonaustin
Generally, fridges (cf freezers) are simple insulated boxes, so all but the rear wall are just plastic/insulation/metal. The rear wall is 'usually' where the evaporator is installed - some are a metal plate that is clearly visible on the inside of the fridge, others are built into the wall. Turn on the fridge and see where the condensation appears - this is where the evaporator is.
Either way the only thing that should get in the way of drilling holes in the sides/door/top is any wiring going to the thermostat and/or light.
Freezers generally have coolant pipes in all walls so are more difficult to miss!
Jason
Either way the only thing that should get in the way of drilling holes in the sides/door/top is any wiring going to the thermostat and/or light.
Freezers generally have coolant pipes in all walls so are more difficult to miss!
Jason
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Frothy
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BlightyBrewer
B)
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BlightyBrewer
You could have done a very rough calc to see if you would be okay (static loading only):-
Consider the shelf to be a simply supported beam, with a point load (fermenter) in the middle (this is not the case in practice, since the fermenter would be a uniformly distributed load, but for the sake of this calculation we will assume a point load).
Lets say the shelf is 50mm long, 30mm deep, and 3mm thick. We will be working in SI units (Newtons (N), kilograms (kg), seconds (s), and Meters (m)).
So, the maximum beding moment is at the mid-length, and is equal to M=P*L/4=25kg*9.81*0.05/4 = 3.07Nm (where P=load in Newtons, 9.81=acceleration due to gravity (m/s^2), L=length of shelf)
The second moment of area of the shelf is I=(b*d^3)/12 = (0.03*0.003^3)/12 = 6.75 x 10^-11 m^4.
Therefore the stress at the extreme fibre is S=(M*d/2)/I = (3.07*0.0015)/0.0000000000675 = 68222222.2 N/m^2 = 68.2 MPa.
The ultimate (breaking) tensile stress of glass is anywhere between 30 and 90MPa. Therefore, you are sailing very close to the wind there johnmac. However, since we have taken a worst case scenario of a point load (you have more of a uniformly distributed load), you are probably okay.
Consider the shelf to be a simply supported beam, with a point load (fermenter) in the middle (this is not the case in practice, since the fermenter would be a uniformly distributed load, but for the sake of this calculation we will assume a point load).
Lets say the shelf is 50mm long, 30mm deep, and 3mm thick. We will be working in SI units (Newtons (N), kilograms (kg), seconds (s), and Meters (m)).
So, the maximum beding moment is at the mid-length, and is equal to M=P*L/4=25kg*9.81*0.05/4 = 3.07Nm (where P=load in Newtons, 9.81=acceleration due to gravity (m/s^2), L=length of shelf)
The second moment of area of the shelf is I=(b*d^3)/12 = (0.03*0.003^3)/12 = 6.75 x 10^-11 m^4.
Therefore the stress at the extreme fibre is S=(M*d/2)/I = (3.07*0.0015)/0.0000000000675 = 68222222.2 N/m^2 = 68.2 MPa.
The ultimate (breaking) tensile stress of glass is anywhere between 30 and 90MPa. Therefore, you are sailing very close to the wind there johnmac. However, since we have taken a worst case scenario of a point load (you have more of a uniformly distributed load), you are probably okay.
QUOTE 50mm long, 30mm deep
Did you mean cm, rather than mm?
I could imagine an engineer at Bosch thinking, “what’s the worst case loading for the shelf? a leg of beef? Or some prat could put a keg of beer in there. Then what if a toddler comes along and starts pulling at it? “
Bosch have reputation to maintain and don’t need headlines like that!
On the other hand, maybe a bean-counter told the engineer to stop being silly and let the legal department worry about things like that!
Did you mean cm, rather than mm?
I could imagine an engineer at Bosch thinking, “what’s the worst case loading for the shelf? a leg of beef? Or some prat could put a keg of beer in there. Then what if a toddler comes along and starts pulling at it? “
Bosch have reputation to maintain and don’t need headlines like that!
On the other hand, maybe a bean-counter told the engineer to stop being silly and let the legal department worry about things like that!
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BlightyBrewer
QUOTE (johnmac @ Jul 9 2006, 01:27 PM) QUOTE 50mm long, 30mm deep
Did you mean cm, rather than mm?
D'Oh!
But still, it won't change the end result since these two numbers are divided in the calcs...but it is still very embarrassing! Lesson, always check and double check, and get someone else to check aswell.
DaaB....you make a good point, it is more like a distributed load applied at two discrete points, or if we really want to go to town, it is a plate problem rather than a beam problem with simple supports on three edges... :stun
Did you mean cm, rather than mm?
D'Oh!
But still, it won't change the end result since these two numbers are divided in the calcs...but it is still very embarrassing! Lesson, always check and double check, and get someone else to check aswell.
DaaB....you make a good point, it is more like a distributed load applied at two discrete points, or if we really want to go to town, it is a plate problem rather than a beam problem with simple supports on three edges... :stun
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mysterio
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Frothy
stonking mysterio.
I just picked up a 4ft chest freezer for £10 (it's as old as I am)
Found this site earlier but I think its a bit over the top, still really looking for a front opening chest freezer that would accomodate a 50L keg or 2 corny's.
Matt
http://www.rayfes.com/me/kegerator/kegerator.php
I just picked up a 4ft chest freezer for £10 (it's as old as I am)
Found this site earlier but I think its a bit over the top, still really looking for a front opening chest freezer that would accomodate a 50L keg or 2 corny's.
Matt
http://www.rayfes.com/me/kegerator/kegerator.php
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Vossy1