Electronics > Beginners
Potentially a stupid question but...
james_s:
There's no reason to suspect the hair dryer doesn't pull 1750W, those ratings are usually quite accurate. With the volume of air moved by a typical hair dryer you need a LOT of energy to make it hot. A hot air rework station will be moving vastly lower volumes of air.
rhb:
I remember watching with amusement as hair dryer wattage ratings climbed to the limit of a standard 15 A outlet which is the only reason I mentioned it. I'm surprised the remark drew so much attention.
The point I was trying to get across is that a standard 120 V circuit is more than enough to power a rework station. The initial power draw might be large, but once it's up to temperature it will drop substantially. A modest amount of insulation will reduce the draw for a thermostatically controlled preheater to very little once the device has warmed up.
sbmotoracer:
If an 1800 watt rework station would be able to comfortably handle most boards then why do we have rework machines that have bottom heaters that consume the same amount of watts as a 120v line with a 15amp fues like:
https://www.ebay.ca/itm/LY-IR6500-V-2-IR-BGA-rework-station-soldering-system-Infrared-reballing-machine/322515180186?hash=item4b17671a9a:g:GDIAAOSwA3dYJDMr:rk:2:pf:0
I'm not disagreeing with anyone just legitimately curious as I don't think rework manufactures are going to have a ... waving contest with watts consumed. I can't imagine the higher heat output would mean anything over a certain amount.
not1xor1:
--- Quote from: sbmotoracer on December 30, 2018, 01:03:44 pm ---Want to start off by saying hello. :-) First post.
This may seem like a stupid question but [...]
--- End quote ---
no question can be more stupid than a subject that does not provide any clue about the content of your post >:D
rhb:
--- Quote from: sbmotoracer on January 11, 2019, 04:43:51 am ---If an 1800 watt rework station would be able to comfortably handle most boards then why do we have rework machines that have bottom heaters that consume the same amount of watts as a 120v line with a 15amp fues like:
https://www.ebay.ca/itm/LY-IR6500-V-2-IR-BGA-rework-station-soldering-system-Infrared-reballing-machine/322515180186?hash=item4b17671a9a:g:GDIAAOSwA3dYJDMr:rk:2:pf:0
I'm not disagreeing with anyone just legitimately curious as I don't think rework manufactures are going to have a ... waving contest with watts consumed. I can't imagine the higher heat output would mean anything over a certain amount.
--- End quote ---
That's a nice looking unit. But not a good thermal design. The board is fully exposed so the heat losses are huge. I wouldn't want to run that on a summer day. That's a reflow oven with no sides or insulation. When you turn it on, there's going to be an 1800 W 8" x 10" space heater running even if the board is much smaller.
Here's what I plan to construct:
A slide out adjustable board mount similar to theirs.
An insulated forced air oven to slowly bring the entire board to 85-125 C
Hot air gun mounted as shown.
A small IR heating element under the hot air gun if tests indicate heating the back of the board is needed.
BTW That unit is usable on a standard 12 AWG, 20 A 120 V circuit with an appropriate change from a 15 A to a 20 A receptacle and a step up transformer. However, it will trip the breaker if anything else is drawing current on that circuit. In modern NEC code construction the kitchen circuits will be your best bet for drawing 20 A. Typically each counter will have a separate circuit.
Other options are the electric dryer outlet and the electric stove outlet.
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