Follow up to post #847.
To be clear I'm not going in the tip business. If this works well across a broad range of powders then I'll open source what & were to get the parts.
I had to machine the part shown so it wasn't a simple order/install deal.
I'm doing this to satisfy my own curiosity, test my theory, & hopefully offer a constructive improvement Adam may choose to apply to future revisions.
I had ordered 2 parts & started with the most aggressive thread lead. It has 3 turns per inch & 4 thread starts. These have very deep grooves for such a small diameter (for large stick powders).
First test is with fine ball powder - Lever Revolution.
I did not expect this to be plug and play, but it kind of was. All I had to change was the level. Previously with no tip I'd had to raise the front with the leveling adjusters to have the bubble half out of the circle line. This was required to get small tube feed under .2 for both Lever & H4350. I was still getting a few overthrows, but it was much better when the small tube was below .2 on calibration.
First Lever test with the Acme .333 lead 4 start tip.
- Only change was to center the bubble level. New calibration flow leveled = Large 16.3 / Small .18
- All other calibration settings stock
Ran 20 loads @29.7gr 8.13 sec avg. No overthrows, ES 4.02 sec, fastest = 6.57 (only one sub 7 sec) & slowest 10.59sec (only one above 9 sec).
Not to shabby.
Edit: Added data. Of the 20 drops 4 were 29.68, 2 were 29.72, & 14 were 29.70
Then adjusted advanced settings & ran 29.7 again, this time 25 drops. Avg drop = 6.5 sec No overthrows, ES 1.84 sec, fastest = 5.21 ( x 3 sub 6 sec) & slowest 7.05 ( only 2 above 6 sec both were 7.05).
Edit: Of the 25 drops 3 were 29.68, 4 were 29.72, & 18 were 29.70
This was not the most aggressive setting I tried, it can go faster. I backed off a little as I'm hoping it will work across a good range of powders without having to screw with setting everytime.
- I'll show settings used, however this only applies for use with this tip.
Front on pic shows transition of small tube - Tip. With everything leveled the small tube has no issue keeping the tip fed. The kernels now just line up in the grooves & feed very consistent. Running like 5 calibrations flow rates never varied more than .1 on small tube, an improvement.
More testing to follow. I've got about a hundred Lever loads to do & then I'll throw some N570 in there and run some more tests.