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Hot Box Temperature - Page 3

post #61 of 74

Hot boxing!  I never laughed so hard!  Well, okay maybe that's a lie.  I can totally see these guys on a snowboards.  Warning bad language.

 

post #62 of 74
Quote:
Originally Posted by ScotsSkier View Post
 

:)   I have to admit it has been to some extent trial and error with the PID!    Certainly didn't turn out as straightforward as expected.!  When i built my hot box I insulated really well and installed a 500w  baseboard heater + fans. What I found was they, while the heater was great at getting it up to temperature, with the thermal inertia and the size of the heat source, even with the PID it was almost impossible to hold it in a tight temperature range.  Soooo, I have now installed a 100W roof heating cable on the base of the box as well.  The 500w takes the box up to near the  desired temp and then the 100W element stays energized and holds it in a tight range.  If the temp drops more than 5-10 degrees the 500W source then kicks in again.  I should really make another mod and use the second output on the PID to fine tune the 100W element but now I have it pretty much dialed in as is.  

Thats some nice nice engineering with your heat system.  Ya trial and error seems to be the common theme with pid's.  When tokos thermobag first came out, their temp/duration rec's went as high as 74 cel.  I couldn't find that literature, but theres this link that contradicts their original rec's.

 

http://www.tokous.com/thermo_bag.htm

post #63 of 74

My sons race on a rec team in California ( = lame snow). My oldest is usually top five and his skis always seemed to come off the hill stripped bare of any remnant of wax at the end of the day. My research looking for ways to overcome this led me to this thread and based on info gleaned here, I built a hotbox.

 

It's primitive in comparison to the photos I see posted here. I used available resources and ran it for hours and hours with nothing in it to make sure it was reliable. The thermostat cuts off when it hits 142 degrees and I have multiple thermometers telling me the circulation is good.

 

I cycled all of our skis through it one time last week with a thick layer of Toko NF, and after a hard day of skiing in conditions that started out icy in the morning and turned to mixed snow/rain by the end of the day, none of them came home looking stripped. In fact, some of them looked luscious by comparison to what I am used to at the end of a day.

 

I just finished cycling the oldest sons race skis thru twice more, first with a coat of Toko LF Yellow followed by a cool down and scrape and then a coat of Toko LF Red. After cool down from the red, there is a small area where the wax looks kind of like a shattered window. Kinda crackly. I'm wondering based upon the collective knowledge here if anyone can tell me...  not enough wax in that area? Or box too hot?


Edited by Recon - 3/8/14 at 11:47am
post #64 of 74
Could be either problem. Hard to say without pic. For that Toko yellow I'd run 125. I personally never run anything over 135, and my ski sauna has been very effective.

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post #65 of 74
Quote:
Originally Posted by Recon View Post
 

My sons race on a rec team in California ( = lame snow). My oldest is usually top five and his skis always seemed to come off the hill stripped bare of any remnant of wax at the end of the day. My research looking for ways to overcome this led me to this thread and based on info gleaned here, I built a hotbox.

 

It's primitive in comparison to the photos I see posted here. I used available resources and ran it for hours and hours with nothing in it to make sure it was reliable. The thermostat cuts off when it hits 142 degrees and I have multiple thermometers telling me the circulation is good.

 

I cycled all of our skis through it one time last week with a thick layer of Toko NF, and after a hard day of skiing in conditions that started out icy in the morning and turned to mixed snow/rain by the end of the day, none of them came home looking stripped. In fact, some of them looked luscious by comparison to what I am used to at the end of a day.

 

I just finished cycling the oldest sons race skis thru twice more, first with a coat of Toko LF Yellow followed by a cool down and scrape and then a coat of Toko LF Red. After cool down from the red, there is a small area where the wax looks kind of like a shattered window. Kinda crackly. I'm wondering based upon the collective knowledge here if anyone can tell me...  not enough wax in that area? Or box too hot?


I would not worry about it.  It may be an area where metal is in the ski.  At 142 F it's not too hot at all.  If the ski looks good after you scrape and brush I would say again don't worry.  It could have been from contraction as the ski cooled down.  I go to 150 F all the time.  I have noticed with the same wax on different skis that some will look different.  I have noticed this in areas where metal is in the skis and the thinner parts of the skis.  In the end, the skis have been fine for multiple seasons and boxing treatments.  If you are not doing this already, after you turn off the heat, keep the fans running until things cool down a while.  Anyway, now you see the difference good base prep. can make.

post #66 of 74
When I scraped them, I found abundant wax right there so it wasn't that....

No kidding on the base prep! I do my skis the same as I do the kids so I can see the difference. It's HUGE!
post #67 of 74
Quote:
Originally Posted by Recon View Post

When I scraped them, I found abundant wax right there so it wasn't that....

No kidding on the base prep! I do my skis the same as I do the kids so I can see the difference. It's HUGE!


Now just keep up with the iron and you will be golden.  I clean once in a while with the Swix Glide Wax Cleaner as well.  Other than that I brush out skis no matter if I wax or not that night.  The Swix Glide Wax Cleaner does not remove hydrocarbon waxes.  It's more like a hot scrape and maybe better, but that's just my opinion.   Happy boxing to you.

post #68 of 74

Hi everyone, I recently built a hot box for my skis and I would like to share it and see what everyone thinks. Also maybe anyone could give me suggestions on what to maybe alter on it. 

My dimensions are 2ft x 2ft x 7.38ft long (225cm). The total items I used were half inch thick plywood, 120v space heater, three fans (photos only show two but I do have another one), many sheets of inch thick reflective styrofoam insulation, a heat shield made from aluminum strips 6ft long riveted to two aluminum flat rods to add rigidness, three digital thermometers for three temperature zones, a thermostat, 2 dual rack railways (20in tall), and 6 dual hinged racks (16in long).

The temperature I usually run the hot box at is 125 degrees Fahrenheit. My thermostat is set to keep the temperature 125 with + or - 5 degrees. I generally keep the skis in for 4 hrs. That time seems to be the typical period most people do it. The hot box can hold 4 pairs of skis.

 

 

 

Thermostat that is mounted on the side. It has a thermometer that is fed through a hole at the top of the hot box.

On the top of the box there are three thermometers (not including the thermostats thermometer) that all measure three different temperature zones. I measure the left, center (rear), and right. The thermostat measures the temp of the center front part of the box. All these thermometers are digital and are connect by a wire so I can lower them in deeper to read all the zones. (very helpful)

post #69 of 74
Nice job! Very similar set up to mine except I used 1/4 ply with 1 inch framing. I also use a PID instead of a thermostat. I actually found it retained heat too well and would start to overshoot on temperatures even though the PID had cut the power . So I added a n additional heat source (100w) roof deicing cable which comes in above 100degrees and shuts off the 500w heater. Helps hold the temps much steadier
post #70 of 74
Quote:
Originally Posted by northwestracer View Post
 

Hi everyone, I recently built a hot box for my skis and I would like to share it and see what everyone thinks. Also maybe anyone could give me suggestions on what to maybe alter on it. 

My dimensions are 2ft x 2ft x 7.38ft long (225cm). The total items I used were half inch thick plywood, 120v space heater, three fans (photos only show two but I do have another one), many sheets of inch thick reflective styrofoam insulation, a heat shield made from aluminum strips 6ft long riveted to two aluminum flat rods to add rigidness, three digital thermometers for three temperature zones, a thermostat, 2 dual rack railways (20in tall), and 6 dual hinged racks (16in long).

The temperature I usually run the hot box at is 125 degrees Fahrenheit. My thermostat is set to keep the temperature 125 with + or - 5 degrees. I generally keep the skis in for 4 hrs. That time seems to be the typical period most people do it. The hot box can hold 4 pairs of skis.

 

 

 

Thermostat that is mounted on the side. It has a thermometer that is fed through a hole at the top of the hot box.

On the top of the box there are three thermometers (not including the thermostats thermometer) that all measure three different temperature zones. I measure the left, center (rear), and right. The thermostat measures the temp of the center front part of the box. All these thermometers are digital and are connect by a wire so I can lower them in deeper to read all the zones. (very helpful)


I like it.  You might turn one of the fans around so that the air is spinning.  Or point one up.  125 F will be fine for soft wax.  If you want to do some harder waxes I would shoot for 150 F.  Can it do 150 F?

post #71 of 74

Yea it can go up to 150F. I might try that sometime. Just to let anyone that was wondering know I am using the Johnson Controls A419 Thermostat. It can go from -30 to 212 degrees F.

post #72 of 74
Quote:
Originally Posted by northwestracer View Post
 

Yea it can go up to 150F. I might try that sometime. Just to let anyone that was wondering know I am using the Johnson Controls A419 Thermostat. It can go from -30 to 212 degrees F.


Sweet!  I use a similar heating and cooling thermostat.  I like the heat shied too.  Good boxing to you.

post #73 of 74

With regards to making a hot box; is it possible to make one with a window?  Not sure of the value of it other than I would like to keep an eye on things.  Ovens have them, so while it might not be cost effective, it could prove entertaining :popcorn

post #74 of 74
Quote:
Originally Posted by L&AirC View Post
 

With regards to making a hot box; is it possible to make one with a window?  Not sure of the value of it other than I would like to keep an eye on things.  Ovens have them, so while it might not be cost effective, it could prove entertaining :popcorn

 

You don't rate the entertainment value of collapsing a Schrödinger's wax wave function?   

 

Sure you can build one.    It would even add thermal inertia, not a bad thing.
 

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