Air Gun Pellet Sorting Machine

YRRAH Pellet Sorter

NOTE: 1 FEB 26 I've added a STL which can be used to print a number of indexes which can be used to replace the bail method of release.  The bail is easiest to learn to use.  The indexes are fastest to operate and with care and practice can be as accurate and much quicker than the bail.  These indexes are clipped on the bed plate and used to index the waist of the pellet.

A shout out to"YRRAH", Harry in Oz which gentleman popularized the technique some twenty five years ago.

This machine is used to sort pellets more quickly and efficiently (and I posit more accurately) than any known method. Sorted pellets group together. This improves accuracy and reduces or eliminates fliers.

There is considerable debate about whether this method works or not among those who have either never tried it or never learned how to operate the rolling table. The machine is sensitive to pellet placement, orientation and release. It takes practice to get consistent. This machine can be mathematically proven to be extremely accurate. Pellets must be very nearly identical to roll to the same point. With practice you will be surprised just how much more accurate your shooting will be. Bench rest shooters in particular will notice an improvement in group size.

The theory of operation is explained in the PDF you can find in the files folder for this thing.

The STL files are available on this page and there is a discussion of the machine here: https://www.airgunnation.com/threads/pellet-rolling-table-3d-print-files.1065200/

There is a video explaining operation here: https://www.youtube.com/watch?v=DVGoby1fggY

This machine works and works very well. It is far faster than weighing and sorting by head size and if you give it an honest try you will find it is actually more accurate than that process.  This because the length of the pellet, the head diameter, the skirt diameter (all three of these physical measurements) are tested in each roll. It is a very precise testing method and highly discriminating.  If any of the three measurements is varied a pellet will roll to a different place.  So it sorts them so that they are identical on the three major dimensional points; length, diameter of head and diameter of skirt.  These are THE characteristics which cause one pellet to fly to a different place from another.  Don't buy into the lie propagated by some who would sell you a $4000 rifle as the panacea for inconsistent pellets.  That's a lie and they know it.  Prove it for yourself.

The size of the bins is your easiest means of adjusting the sensitivity of the sort. Smaller bins are more accurate. The PDF explains the math. I'll bottom line it though. The sweet spot is 1 inch wide anything wider than that should be held in a separate group because the characteristics of those pellets are sufficiently different to cause it to shoot to a different zero. Neither can you combing the group which was on the high side with the group which was on the low side (unless you are trying to increase group size).

Notes: Print the spindle on a raft. I'd print parts one at a time as some of the detailed work will be frustrating if your printer is picky. You'll want a layer height of around .20 to .16 unless you want to sand contact points. You might still need to sand them even at those heights. Lube contact points with silicon grease after assembly. Good luck. I like PETG but PLA works just fine.

Category: Sport & Outdoors