Hi All I am going to be building a heater cabinet for Heat treating and was wondering if the following heater would work? This is what the catalog says;
Easy-to-Wrap Heat Tape with Temperature Controller This flexible constant-wattage heat tape is chemical and moisture resistant. It's made of braided wire
elements wrapped in fiberglass and encapsulated in silicone rubber. Perfect for bending plastics, thawing frozen pipes, and applications requiring rapid
heating. The attached controller lets you regulate the on and off time of the tape. Maximum continuous heat output is 450° F. Tape can be exposed to
temperatures from -60° to +450° F. To prevent burnout, heat tape must not be overlapped and all of the tape must be in constant contact with the surface being
heated. To determine amp draw, divide total watt output by volts. Tape is 1/8" thick, single phase, and has a 6-ft. long power cord. 120 VAC tape includes
a standard two-prong plug; 240 VAC tape does not include a plug. Thanks Paul
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Heater Element
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 franklin |
Heater Element |
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Posts: 6 01/24/2009 02:56 |
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BigTJ |
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Posts: 688 01/24/2009 03:29 |
How many watts? That's what you want to know, not temperature. Something can be hot but have a low wattage and not work. Think of watts as heating power.
To work in an oven you need some heating power, I think you need several hundred watts up to maybe 1,200 for a viable oven depending on your design (how well
insulated, whether or not it circulates air). BTW too many watts will trip standard household circuits, can't remember how much maybe an electrician can
help us out with that, I think it's around 1,500 W which is the max wattage you see in most household appliances. A heat gun works in an oven because
it's fairly high wattage and has a lot of heating "power".
Here's and example of heat vs. watts. A 100-w lightbulb is extremely hot (I think the tungsten filament in a lightbulb reaches 2,500 C, that's real hot let me tell you) but if you use only one it will only heat a hot box to about 100 degrees. A dozen lightbulbs would get you over 350 no problem, the only drawback being you'd probably melt the wires coming into the bulb and burn your house down. Anyway don't take my hot air as gospel if you are serious consult a friend who knows something about electricity don't soley rely on web advice on this stuff, I would hate to give you advice and have you start something on fire.
Last Edited By: BigTJ 01/24/2009 03:35.
Edited 2 times.
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franklin |
#2 | |||
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Posts: 7 01/24/2009 03:34 |
BigTJ
Thanks for the info, looks like it will not work, it is only 216watts Here is a link to the site, http://www.mcmaster.com/#...t-cable-and-sheets/=am0so Thanks again Paul |
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BigTJ |
#3 | |||
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Posts: 689 01/24/2009 03:36 |
Well if they aren't too expensive you could use multiple. Check the cattanach book or with someone on the board, figure out ballpark on the watts and go
from there.
Good luck, -John |
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aparramoure |
#4 | |||
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Posts: 1642 01/24/2009 03:51 |
Why not use a mica heat element?
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franklin |
#5 | |||
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Posts: 8 01/24/2009 03:55 |
I would use one, but I am having issues finding one, I called the place in the back of the Cattanach book, but had no luck.
Any idea of the cost these days? And who else is there to call? Thanks Paul |
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Dnb57 |
#6 | |||
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Posts: 15 01/24/2009 04:15 |
You're correct John. I would not use much more than 1500W on a 120 circuit. That's 12.5A. You never want to exceed 80% of your circuit breaker.
You're at the limit on a 15A breaker and you have a little more room on a 20A breaker, but not much. You may not know what else is on that circuit. Always
best to consult a journeyman Electrician so you don't burn your house or shop down and even worse somebody injured or killed by a fire or electrocution.
Dave |
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aparramoure |
#7 | |||
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Posts: 1643 01/24/2009 10:53 |
Paul, they may have gone out of business.. maybe run a google on mica strip heater elements. (?) As I have in my notes,, the total was around $150, heater,
high temp wiring, thermostat and shipping.
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john channer |
#8 | |||
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Posts: 696 01/24/2009 11:09 |
A poor man's heating element that actually works is readily available at Walmart or a decent hardware store. Not a heat gun but an electric hot plate, you
even get the temperature control with it. Get a new one with a large element to get the length needed, dismantle it and straighten the coil. I've heard
that once heated they won't straighten again, but I haven't tried this on an old one so I don't know. You'll have to rewire it, but if you
write down where what wire goes where when you take it apart that won't be hard. I know these work because I used one for 5 or 6 years until a friend gave
me a strip heater.
john |
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BigTJ |
#9 | |||
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Posts: 691 01/24/2009 13:30 |
I looked at cattanach's book it says 650 w for good heat up.
I know you can get those Mica heaters. I think Harry Boyd (canerodscom) knows where. |
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Parahopper |
#10 | |||
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Posts: 5 01/24/2009 15:41 |
I ordered a 5' 120v, 650 w strip heater (part # S1J54AS1) from Grand Technologies, Inc. in August. Their number is 616 575 9120. They knew exactly what i
was using it for, and also recommended a thermostat (part # 5320-175). Together they ran me about $150 including s&h.
Trey |
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aparramoure |
#11 | |||
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Posts: 1644 01/24/2009 16:45 |
Parahopper,the phone has been dis connected, with no further infor.
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flyman.flyfishingarkan... |
#12 | |||
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Posts: 6 01/25/2009 00:29 |
I got this from Tony in November for a mica strip heater.
--> It is A-Teck in Tulsa --> 1 800 225 6102 --> Ask fot Jim Cox and tell him what you want to do. Larry |
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glassfisher |
heater element | #13 | ||
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Posts: 15 01/25/2009 13:35 |
Grand Technilogies is now Youngblood Automation, phone 616 245 4111. I placed an order 2 weeks ago and the shipping/service was excellent. Even though it
appears that the ownwership has changed, they still know the part numbers when you call.
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franklin |
#14 | |||
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Posts: 9 01/25/2009 14:50 |
Thank you all for your input.
Galssfisher, what did you pay for your heater and what did it include? Thanks again Paul |
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oddsnrods |
#15 | |||
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Posts: 181 01/25/2009 20:55 |
When I was new to all of this rod making I sweated the mica heater details, then I found the plans for the very best hot air oven, from the Planing Form,have
not considered the mica route since. Mine is insulated, works amazingly well and cost less than $60.00
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Parahopper |
#16 | |||
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Posts: 6 01/26/2009 09:21 |
I got an email from Judy Moore at Youngblood Automation (she used to be with Grand Technologies), and they are still carrying the S1J54AS1, price is $72 +
ahipping.
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fishbum |
#17 | |||
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Posts: 244 01/26/2009 10:52 |
Mor Electric Heating Assoc., Inc
http://www.morelectric.com/index.htm Another source for heating supplies. Nice folks to work with. fishbum |
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BigTJ |
#18 | |||
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Posts: 695 01/26/2009 14:45 |
oddsnrods,
What is your temperature delta on that oven? I have yet to measure a heat gun oven, even the McAulntny oven (the one heavily insulated) with less than a 20-degree delta, and the others have a 30-40 degree delta. The one oven I measured like yours had a temperature delta of 45 degrees. I am measuring the temperature with an extremely precise thermocouple not a dial thermometer. I built a McAulntny style oven 3 weeks ago, the write up said zero degree delta, I followed the design to the letter and I still get a 20-degree delta. I think the guy who did the write-up must not have had very sensitive thermometer if he was truly getting a zero delta. In retrospect, intutively it seems physically impossible to have a zero delta, I should have known that was not correct. Despite the 20-degree delta I have done a lot of testing and it bakes great you just have to flip the strips. I left one strip in there for 40 minutes at about 335 and for sure you can tell the difference one end vs. the other. Point is, the reason why in retrospect I think a mica oven is a better way to go is the potential for a lower temperature delta. Not that a low temperature delta is absolutely necessary, it would just be nice not to have to flip the strips. Thanks, -John |
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oddsnrods |
#19 | |||
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Posts: 182 01/26/2009 22:05 |
John , 375 degrees for 4 minutes then turn and repeat. The candy thermometers vary between 5 -10 degrees between them , as the unit warms the temp settles down
and there is less of a difference between them. As I mentioned, when I started out I worried about all of those little details - maybe one of those zero deltas
was one of them. The heat is rushing all about the place in my oven, when heated the strips are easy to work on and do not scorch or darken. One pal of mine
made his own oven which is more akin to a CAT scan unit, I am not sure if it works any better than mine. Like I wrote I am very pleased with it and the design
is less of a hassle to make ( I seem to remember) than a mica version. Very good for those new to rod-making.
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BigTJ |
#20 | |||
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Posts: 700 01/26/2009 23:13 |
Oddsnrods,
Thanks for the feedback and information. I agree all that matters is the results, who cares how you get there. I get good results with my heat gun oven so far as long as I flip so who cares. Would be nice to have an oven with even heating but can do without it for now. |
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