8. unhappy with heating up, not enough power, hot air circulatuion unusable
I measured the heating power with 800-900W depending on filament temperature
not enough especially when the hot air circulation is on the board temperature raise is way too slow to follow the reflow profile
here I had the hot air fan only on during the soak phase the lamps on at 100% barely getting the temperature stable
then I switched it on at peak temperature and cool down
I ordered now 6 1300W tubes 10 inches long
having the tubes connected as pairs in series I get 1950W
this should be sufficient and the 10A electronic relais should handle that with no problem
P=1300W*6/4
also 12 of those holder which schould fit the compartment, I may have to add a few mm to make the tubes fit the spring loaded contacts properly
also the cool down is a bit slow I think about removing the back side slots and replace that with a steel fan protection for less resistance for the air flow
the used fan is an EBM Pabst 4656N with 230V 19W 160m³, nothing to change there to improve much in the same size
I had a look in my fan box and having on hand 120mm a 19 (same model) and 20W 230V one
as well as a 150mm 39W with 405m³
I guess I go for the big one mounted outside, just need to order a fitting fanprotection
cutting hole just with hand cutters at it in the middle of night here, tomorrow I will get the jigsaw
the metal quality is very bad sometime the steel simply broke when bending it outside to cut next part
also the feet need to be replaced as they smear black stuff when moved without lifting completely
bite out all the old fan slots
Used a saw to remove as close to the new smaller marking then a Multitool to grind the rst away
also drilled holes for new fan
taped the inside insulation to prevent air from blowing inside it, now all air should go into the PCB compartment
threads cut
FAN!
