Grinding method 2

I have not confirmed this method but it looks good in theory. An electric garbage disposal unit/food waste disposer/sink grinder, aprox 370 W, 2600 RPM, cost: 200 Euro. No knives or blades. Instead, it is a rotating mechanism which presses the material out through small holes in the outer walls.

Grinding method 3 (recommended)

I have never seen this method mentioned in relation to AN prill grinding. However, theoretically, it sounds like a wonderful idea.

A barley crusher/malt grinder is used for grinding barley in micro-brewery operations (enthusiasts brewing their own beer etc). It is a mini grinding mill, a unit operation designed to break a solid material into smaller pieces.

There are two main suppliers of relatively inexpensive barley crushers; Barleycrusher.com and Crankandstein.net

1. https://www.barleycrusher.com/

2. https://www.crankandstein.net/

Of the two I would recommend the Barleycrusher with the following specs:

· Roller assembly: 1, 25” diameter x 5 “ length

· Models: 7 lb (3, 2 kg) or 15 lb (6, 8 kg), go with the 15 lb

· BC adjustment range: 0, 015 to 0, 070 thousands of an inch. Default set at 0, 039. This is the way to fine tune your rollers, to adjust them so that you get finer powder etc.

· Rollers have: 12 TPI knurl

· Comes with a solid base with locators to center the Barley Crusher on a 5 gallon plastic pail. (Pail not included)

· The standard hopper holds 3, 2 kg and the optional large hopper holds 6, 8 kg. Using a 3/8 drillmotor at 500 RPM gives you a crush rate of 2, 7 kg per minute

· The Barley Crusher is shipped fully assembled. There are no adapters needed to use a 3/8 drill motor.

· Cost: 15 lb variant, costs 115 USD with an additional 60 USD shipping

· A hand crank is included but it is advisable that you use a drill (you just fasten the drill bit where the hand crank used to be)

· You will also want a high quality drill with adjustable speed (cheap version drills may be just as good as long as they have an adjustable speed). You want to use a relatively low speed (150-200 RPM). However, you should test and confirm this as higher speeds may be viable. You should not select a battery drill as each battery will only have enough power for 10-12 kg of corn (prills) according to one forum source. Buy a second hand, high quality drill on your local online marketplace or ebay. Just keep in mind that the US voltage (110-120 V) is different from the European (220-230 V).

· Example drill: https://www.dewalt.no/powertools/productdetails/catno/D21520/

Grinding method 4 (not available)

Grist Mills for the crushing of barley or wheat are also effective (wind mill, water weel, motorized or by using an oxe). A ton of material can be processed through one this size in about two hours. To bad this method is not an option for 99, 99% of us.