acfixer69 wrote:Big Swede's SPP machine was the cat's ass viewtopic.php?f=50&t=49704 take a look you might fine a nugget. Good stuff in there.
Thanks, looking back it it now, my bits are too small.
I had found this and it has the base at .125" which is 3mm, yet the other post is calling out base width at between 5.3mm and 6mm. My length is because it is calling out for an 11mm length and not 5.5mm to 7.4mm as in the post. That made my bits long and small. Back to bit making I think for me.
Got to making more bits today.
I made the concave washer movable. It'll rest against the drill chuck teeth. This way I can adjust the length on the bit.
The 2nd bit without the washer shows a locking collar to hold the washer in the correct spot. The hole though the washer is about the same size as the width of the bit. I made them according to the measurements in the 3rd post of this thread viewtopic.php?f=50&t=49704 which I had forgot about.
Did I mention I am at work and our grinder is broken so I hand filed these. They are stainless steel too by the way. (my arms are tired of filing, lol) at least they should last.
Nice. The one on the right looks perfect.
Only one suggestion. I found that the edges of the tip had to be sharp so as to bite the wire and hold it on the mandrel.
I finally made some real SPP!
I made a new tensioning device and tried out my new bit. It worked for like 4 inches of great SPP and then it started to double up on itself at the bit. I think my little drill can't keep a smooth speed. I am controlling it with a variac and it'll go fine and then bog and then go fast. I might have to switch over to the drill press at my Dad's place. At least this gave me some motivation to keep trying.
Dad300 mentioned you'd have waste at one point. I'd say he was right. After this 2 lb spool is out I might have to buy a 10 lb'er.
Hello,
I started to make my own SPP with 0.4 mm stainless steel wire, AISI 304. I made a tarod out of a screw. I made the shape rectangular and it is 4/2 mm near the screw nut.
The external size of the loop is about 5/3 mm because the spring widens a bit. Is it suitable for the 2" column or I shoud make the tarod thinner?
I forgot to mention, I can use the column of 1.3 or 1.6 m. I thought to let SPP bigger to be able to use more power but use higher packing length to compensate for the lack of HETP of a bigger, rectangular SPP. What do you think?
Iulistoi wrote: ↑Fri Mar 26, 2021 3:30 am
I forgot to mention, I can use the column of 1.3 or 1.6 m. I thought to let SPP bigger to be able to use more power but use higher packing length to compensate for the lack of HETP of a bigger, rectangular SPP. What do you think?
" I know quite certainly that I myself have no special talent. Curiosity, Obsession and dogged endurance, combined with self-criticism, have brought me to my knowledge and understanding "
They look way to big to work properly.. what are the size of the SPP..
Mars
" I know quite certainly that I myself have no special talent. Curiosity, Obsession and dogged endurance, combined with self-criticism, have brought me to my knowledge and understanding "
Iulistoi wrote: ↑Sat Mar 27, 2021 9:51 am
They are 5/3/5 but being twisted let's say 5/5. How big should they be?
What does 5/3/5 mean.
Mars
" I know quite certainly that I myself have no special talent. Curiosity, Obsession and dogged endurance, combined with self-criticism, have brought me to my knowledge and understanding "
I made 3 kg SPP in 4 days, manualy. The volume of 3 kg is about 2.2 l... quite dense because I used 0.4 and 0.45 mm wire. The size is 4 mm wide x 5 mm average length. When you blow through the column it's quite hard. You can breath through it but I would have preferred a little bigger SPPs to be able to use more power.
Yesterday, I tried the SPPs and when I finnished the heads collection with high RR at 95.5%, I bring more heating to the pot to make things go faster and the boiler started to puff through the lid. I reduced the heating and I collected hearts at 2.5 l/h at 93% with minimum RR. I increased the RR again in the end of hearts to squeeze most of the good, drinkable spirit and the ABV increased again to 95% and then the tails was very well compressed.
In conclusion, I am satisfied with SPPs but if I did others, I would choose a little larger diameter of springs, maybe 4.5 or even 5 mm.
I made another mandrel with triangular profile. 2 kg was made with first, rectangular shape and the last one kg, with triangular shape. I blended the two types. I don't know that was a bad idea.
Yeah, there was a lot of work and effort. At least I know that I'm able to make 1 kg of SPP in about 8 hours of work with just a drill, mandrel and pliers.
