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but is it conduction if there is no physical contact between the herb and the heater? except, maybe, a couple of points of contact, rather than the "mash it down against the heater plate" in the PAX.

very nice! much more impressive than my BBQ thermometer.

not a clue … i need at least another iteration on the pcb - it needs some edge fingers to program the processor and to connect to the BBQ thermometer pcb … i'm not sure yet how that should work. but knowing that it is possible to get the BBQ thermometer my way - makes a bunch of things so much...

Another update … my parts bin of BBQ thermometers was getting empty, and somewhat on a whim, i got on Alibaba and ordered another 20, from a different vendor … pretty fast shipping - a week … so i pop it open to look at the probe and lo and behold, a much smaller probe - new one on top, old one...

maybe you can help me understand the heat transfer dynamics ... specifically: what is the equation that quantifies the heat transfer from the surface of the heater to the incoming ambient airflow? i try to find this every once in a while, but with no success. i did find a calculator that...

i thought i had a datasheet for the 18650, but i guess i didn't save it, but i would swear that the characteristics were identical to the 26650, except less capacity of course. i.e. 70A discharge rate and voltage has an extremely sharp knee at the end of the discharge - plus the 1000x recharges...

i feel if i exhale vapor, that is wasted vapor - it should be absorbed. i can see the vapor in the draw tube during the inhale, so i know what i'm getting - seeing it on exhale is not necessary to know it's there. so i can control the amount inhaled so very little is wasted. adding fresh air...

if it were me, i'd wait until i had a working prototype before incurring this kind of expense.

i was (am) pretty impressed with the LiFePO4 cells from A123Systems: 70 Amps (120 Amp burst), 15 minute recharge, adequate capacity at ~ 2/3 of the best capacity li-ion. i guess Musk/Tesla has moved on from this chemistry.

on the east coast it is 120v @ 60Hz

because … internet experts. long term storage is never an issue in my crib, but i did get some 62% boveda and some herb sat in the jar for several weeks. then, when i vaped the herb, there was a white film on the inside of the glass vial holding the herb. my analysis is that the herb picked...

i have measured the temp in the middle of the herb in the vial to be 50F below the heater temp, and it rises to the heater temp at the start of the hit, then drops 50F after the toke. i just keep the draw tube on the vial between hits … no vapor escapes, and if i don't clear the draw tube, the...

at the risk of speaking when not being spoken to, i will assume you mean The Herbal Cube (aka Bud Toaster), when you reference "the cube", so … yes, the herb is inside the heater, but don't forget the radiant heat aspect. the ribbon heater is surrounded with a cylindrical shiny stainless steel...

what is it with bongs? is it your experience that all vaporizers are so hot that you must have water cooling/filtration for the vapor? or very sensitive lungs? it occurred to me after thinking more about @JJR's convection, all glass vape, that he was running it at 500F - and it seems all the...

well, i don't use a bubbler or water tool, so that is left to the user. i never need it - the draw tube is adequate cooling for me. and the keyboards! can't have a bong just sitting there, waiting for me to knock it over on my desk and spill bong water all over the keyboards. taking keyboards...

@cascades - no, the glass oven tube is not easily removable without disassembling the cube by taking the pcb out the bottom to have access to the ribbon heater, which holds the oven tube pretty snuggly … it really doesn't get dirty, but a q-tip/iso could clean it. i don't use concentrates/oil...

no, not at all - not a product yet, so there is still time to make it better. i was confused about the conduction characterization - i see the PAX and PAX2 as being pure conduction, and mine is not like that - that is, needing to mash the herb against the bottom heater plate. when my oven tube...

@JJR - part of what @Stu is basing his comments about the "rules" has to do with a lot of history on this forum about material safety ... it can get heated ... and, eventually it just gets down to "you pays your money and you takes your pick". You, like me, value 100% safe all glass air and...

ah, i see what you are saying. well, i see it more as radiant heat, rather than conduction, but i take your point. it definitely heats the herb while it sits inside the oven tube - inhale or it just cooks away.

sorry for not being clear … it is definitely convection. the herb sits in a flat bottom vial, the vial is put into the oven tube. the herb does not touch the heater. the ribbon is encapsulated … there is a stainless steel washer 1/8" below the top of the oven tube - not shown in the diagram -...