Johnd0e

thanks der8auer. that helps tons, i dont think id have ever found that info searching google haha. glad i was on the right track with threading the holes...if there is one thing im good at its google image search lol. glad you pointed out the hole sizing and thread pitch before i started machining, i was originally planning on using 1/4-28 tapped holes around the perimeter and the inner circle, and then a 1/2-20 tap in the center....so equivalent to an m6 fine thread around the perimeter and inside holes and an m13 fine thread in the center. guess ill just redo it to be coarse thread and bump my outer holes to 3/8-16 thread (m10 equivalent) thanks again, your a big help. material comes in tomorrow, so ill be starting on it asap.

so copper never showed up....apparently the guy who does all the ordering for the shop "forgot" to order my stock. anyways, i have enough copper to make 3 bases coming next week....i made sure he ordered it haha. but in my spare time ive been looking at other bases on google and looking up more info on the leidenfrost effect. as for the leidenfrost effect all i could find about "breaking" the barrier is an article from nasa or something explaining how they used nano particles to create a textured surface which resulted in the ability to make water boil over the leidenfrost effect point. Soooo since ill never have the means to do anything like that, i was thinking something along the lines of rough milling all the surfaces that will contact ln2, tapping all holes and possibly sand blasting the insides of the base to try to texture the finish.....at least ill try that on one base to see what happens. heres what i figured for one of the bases, with weight compared to a complete solid base. (i also changed my base height from 2.0" to 2.5" becuase the 2.0" base weighed ~1.5kg solid) consists of an inner and outer ring milled into the base, outer ring has 16 x .25" tapped holes inside of it, and the inner ring has 8 x .25" tapped holes inside. center hole is .5" and also tapped. i figure tapping will not only create more surface area then a straight hole but also give more sharp corners. not sure if that works, but i got the idea from the koolance base i think it was....i dont remember but somebody already did it is all i know. thoughts, concerns, input?

Thank you very much thats exactly the kind of help i was hoping for. Glad i posted here. Thank you for that info. Cant say im educated on the leidenfrost effect, im aware its caused by very different temperatures coming into contact creating a barrier. Like cold water in a hot pan. Thats about as far as my knowledge goes so i guess ill have to do some more reading up on that. By sharp edges are you speaking of the the corners where the horizontal and vertical faces meet? Would machining circles into the block in a "bullseye" orrientation be more effective? Thanks again.

alrite, i posted this over on ocn but i figured id double my chances of getting input by posting here too. anyways, im making my own ln2 pot, as the title suggests, during breaks at work. so far ive taken measurements off my waterblock back plates to get things like diameter of the pot and were the holes need to be on the mounting bracket. only thing im at a loss for is placement of the thermal probe and how much surface area i should go for in the copper base? i believe its alot of surface area will make it a fast pot and too little will make it slow. but how much is to much and how little is to little? anyways heres my cad drawing of what it will look like, pretty much just a round version of the gemini F1. consists of a copper base, aluminum canister, aluminum mounting bracket and aluminum extension. overall diameter is 3.000" (can you tell im american), total height is 8.000". copper base is 2.000" thick. EDIT: i should mention to disregard all the holes in the copper base as thats just there as a visual aid for what ill be doing to gain the surface area(just like the kingpin pot i believe). depth, diameter and number of holes will change depending on surface area i decide on, hopefully with the help of others.