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Old 09-12-2006, 04:05 AM   #21
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Quote:
Originally Posted by Yuri_Rage
these are only 1.5 inch diameter by 4 inches long. I'm planning 2 inches in diameter and 12 inches long. (That sounds really bad...)
... especially when taken out of context.
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Old 09-12-2006, 05:23 AM   #22
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and on here, it's ALWAYS taken out of context.

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Old 09-12-2006, 08:12 AM   #23
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How about this nice looking Crankandstein complete system for only $139. Seems hard to beat. Take it out of the box, put it on top of your bucket, dump in your grain, attach drill and grind.

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Old 09-12-2006, 03:06 PM   #24
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Originally Posted by beer4breakfast
How about this nice looking Crankandstein complete system for only $139. Seems hard to beat. Take it out of the box, put it on top of your bucket, dump in your grain, attach drill and grind.
Mine'll be twice as big for a quarter the price.

If you ever hear that on a street corner - run far, far away.
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Old 09-12-2006, 03:20 PM   #25
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Of course you could by one! That's not the point, we could by beer too! Take it out of the box, open the top, put it to your mouth and dump it in your stomach. Where's the fun in that?

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Old 09-12-2006, 03:27 PM   #26
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Ah, well, you have a point, Mr. Chairman! The answer, I suspect, depends on what you consider fun.

Great analogy, by the way.

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Old 09-13-2006, 07:01 PM   #27
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Powder coating may not be desirable- isn't the plastic used generally low friction? I think you want friction to grab the grains. I'd like 4" steel, no gears or knurling. Or 3" aluminum- al has more friction. Chain and Sprockets may be cheaper than gears, either could be added later if it don't feed. Hmm, I should try mine with a gear removed, quieter that way.

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Old 09-13-2006, 07:29 PM   #28
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Quote:
Originally Posted by casebrew
Chain and Sprockets may be cheaper than gears, either could be added later if it don't feed. Hmm, I should try mine with a gear removed, quieter that way.
Chain and sprockets would require extra steps to get the rollers to counter-rotate.
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Old 09-13-2006, 08:12 PM   #29
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Quote:
Originally Posted by casebrew
Powder coating may not be desirable- isn't the plastic used generally low friction? I think you want friction to grab the grains. I'd like 4" steel, no gears or knurling. Or 3" aluminum- al has more friction. Chain and Sprockets may be cheaper than gears, either could be added later if it don't feed. Hmm, I should try mine with a gear removed, quieter that way.
Powder coating has just as many finishing options as paint, if not more. I can use a flat finish or even a textured finish to increase friction. I don't think I'll have a friction problem, but the plastic used in the powder coating would almost certainly wear at a pretty rapid rate. Just for $hits and giggles, I'm going to make two sets of rollers, one set powder coated, the other set unfinished, and compare the results. I might experiment with an aluminum set as well.

As for the material - I'm going to use 2" mild steel. 4" dia. steel would have a LOT of rotating mass, and I'd like to keep power requirements somewhat in check. Knurling is going to increase the friction coefficient - I'm not sure what advantage a plain, smooth roller would give unless you're trying to grind really fine flour.

Gears/sprockets: NONE. I'm going to power one roller and use the adjustable side as an idler. The moving grain should be enough to get it rolling, and an idle roller greatly simplifies the design.
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Old 09-13-2006, 10:39 PM   #30
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Quote:
Originally Posted by Yuri_Rage

Gears/sprockets: NONE. I'm going to power one roller and use the adjustable side as an idler. The moving grain should be enough to get it rolling, and an idle roller greatly simplifies the design.

My JSP maltmill has a viton o-ring on one roller which gets squeezed between them and gets both going. I'm sure there isn't much power being transfered but it does seem to give a bit of impetus when you first start to help it along before the grain starts being crushed. I thought it was an elegant solution.

P.S. A friend of mine has lined up a small engine lathe that is going to live in my garage! I'm gonna have soooo many mills!
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