These are videos of hulling rice between two pieces of plywood, a simple pinch roller system using easy to find parts, and an easy to build rice de-huller using Stoltz RP-57 rollers. The videos also include instructions for building these human powered rice hullers. If you have questions or know of other simple rice hulling methods you can contact me at firstname.lastname@example.org.
The videos above show the two handled rice huller hulling rice and then it is taken apart showing the various parts. We use Stoltz RP-57 polyurethane rollers which are 3 inches wide and about 5 inches in diameter with a 1 1/8" hole at the center. The rollers need no modification. We purchased ours through Eastern Marine in Newark Delaware. All other parts may be purchased at hardware or lumber stores. The belts we're using to drive the paddy feed roller are vacuum cleaner belts, Hoover self-propelled wind tunnel, Style 170. Go to the chain and sprocket page for details about the spring and gap setting system.
We use a table top drill press to drill our holes so they are well aligned. We also use a fortsner 1 1/8" bit to create smooth sided holes.
The gap is set by turning the lock nut against the metal brace and the spring tension is set by turning the nut on the bolt. The goal is to set the gap and spring tension so the rice is hulled using the least amount of load, that is with less spring compression. Extra compression (load) only puts more pressure than needed on the rice grains and rollers without increasing the hulling percentage. The foam also acts as a spring pushing against the our spring so the spring compression must first overcome this force from the foam between the sidewalls.
If you have questions after watching the video please email me at email@example.com. Good luck.
We did de-hull wild rice!