Tuesday, March 31, 2009

Diamant Review

Diamant's Model D - 525 Grain Mill was used for this test. I ground 6 cups of flour in two passes. The Diamant will grind finely in the first pass. However, I have found that it's much easier to grind it coarsely then grind it a second time at the fine setting. In total, between the two grinds, it took me 1090 revolutions at 80 RPM which required a time of 13:31 to turn this into a very fine flour.


  • The flywheel, axle and one burr (the rotating parts) equal 21 lbs so once this weight is turning, the momentum (inertia) makes grinding easier than mills without a heavy flywheel.
  • The flywheel handle is longer than some other mills. Two people can turn it by facing each other, each person using one hand to turn the flywheel.
  • The mill contains a 3 inch long brass bushing between the housing and the drive shaft for long life (Note: these have since been upgraded to ball bearings like the Country Living Mill).
  • The flywheel has a groove for a "V" belt if motorization is desired.
  • The mill weighs 53 lbs. Bolting the mill down is highly recommended. Users should be careful not to drop the mill body. Cast iron is far more brittle than steel or aluminum and susceptible to cracking.
  • Mill comes with wrench, screwdriver and parts list.
  • The mill is adjustable to some degree, but different textures of flour require different sets of grinding plates. Diamant sells the All Purpose, Extra Fine, and Extra Coarse grinding plates. Each set runs approximately $135.00.
  • Manufactured in Poland
  • Though the Diamant makes claims of being able to grind nut butters, the truth is that it doesn't do a very good job of it. The Diamant will produce a small bit of nut butter before clogging, and subsequent nut butter must be forced through with some sort of pestel or rod. The Diamant will suffer similar problems with any soft, moist or oily grain, bean, or nut. This is a common difficulty with hand-grinders and not a limitation unique to the Diamant.
  • As flour is hot to the touch as it exits many electric mills, the heat generated may damage the vitamin E content of the flour. The 80 RPM average hand speed in this test using the Diamant didn't heat the flour in any way.
  • Current Price is approximately $1,300.00
Here are the results for a second timed grinding test:
    • I performed two tests using 3 cups of Hard Red Wheat and then again with 3 cups Hard White Wheat to make a total of 9 cups of very fine flour. I milled the grain twice but this time I attempted to make the effort and revolutions the same for the first and the second grind. I measured the threads per inch on the adjustment screw that pushes the rotary burr against the stationary burr so that the burr to burr distance could be determined.

      • First Milling - 0.018", 712 revolutions
      • Second Milling - 0.006", 695 revolutions

      The 1407 Revolutions took 21.6 minutes or 65 RPM. Nine cups of very fine flour were produced from 6 cups of grain, or 156 Revolutions per cup of flour.

Large portions of this review were derived from information and testing data supplied by Don Craig of Kentucky.

1 comment:

Eloquine said...

Wow, this is a really good review. Thank you so much, my husband and I are looking for a grain mill, and this is the best site we have encountered. Thanks thanks thanks !