Jump to content
Nugget Shooter Forums

DIY Sluice Riffle Shape


jeremyisme

Recommended Posts

Hi all,

First post and all, so please be gentle!

I have been trying to research about making a DIY sluice for use with the dredge I am also making. I am looking to make a 3 stage sluice.

But I have been having trouble finding specific information about the shape and size of the riffles in a sluice. I know they are L shaped, or more correctly a 7 shape, with flow as such <- 7 <-

But how high are the riffles?, how long are the tops of the riffles? Do you set them back at an angle? Do you keep them off the bottom of the sluice slightly or put them right on the bottom of the sluice?

So if anyone is able to give me some pointers, that would be much appreciated. (pictures would be really good!!)

Thanks

P.S I did try to search, but it seems dry washing is very popular on this forum, and that all that populated my results!!

Link to comment
Share on other sites

Building your own 3 stage dredge is an ambitious project. The size of the riffles will depend some on the size of your dredge hose. Really big dredges suck up big rocks. Your riffle design must allow them to roll over and out the tail. Small dredges can only suck up small rocks, so the riffles are designed accordingly. Generally on stream sluices the first few riffles are Hungarians followed by some 45 degree riffles. The idea is to design your riffles (and operate your sluice) so that you maximize laminar flow and minimize swirl or turbulence. Steady laminar flow will tend to keep the fines trapped in the low pressure zone immediately behind the riffles (the down stream side) until you build up sufficient concentrates to justify a clean out. Any swirl or turbulence will tend to dislodge and kick some of the concentrates from behind the riffles. If you pre-classify, then your riffles can be shorter and your flow rate can be reduced to maximize recovery. There is a lot of literature out there that is beyond the scope of an e-mail thread. Happy reading!

Link to comment
Share on other sites

  • 5 months later...

I too want to hear this one.

I went to my local AC sheet metal fabricator.

Had him bang me one up years ago from 18 gage.

8" by 48" clean trak first 6"...

3/4" riffles turned 45% toward the flow every 8" ..... 6 Riffles from start to end.

Lined with Rubber Mat, and Indoor out door carpet.... 3/4 inch diamond lat on top of carpet......

Later I had a bevel throat put on the front of 10" 12" down to 8"

I have never seen any thing better working.

Total Cost..........$$35.00

Link to comment
Share on other sites

  • 2 weeks later...
I too want to hear this one.

I went to my local AC sheet metal fabricator.

Had him bang me one up years ago from 18 gage.

8" by 48" clean trak first 6"...

3/4" riffles turned 45% toward the flow every 8" ..... 6 Riffles from start to end.

Lined with Rubber Mat, and Indoor out door carpet.... 3/4 inch diamond lat on top of carpet......

Later I had a bevel throat put on the front of 10" 12" down to 8"

I have never seen any thing better working.

Total Cost..........$$35.00

It only cost you $35.00 to make your own? Do you have plans for it or anything?

Link to comment
Share on other sites

That was just the sheet metal work.

I had to add the expanded steel and matting.

Mine was smaller then this one but pretty much the same Idea.

http://nevada-outback-gems.com/design_plan...hand_sluice.htm

Here is some info for yea!

http://www.goldgold.com/sluicing.html

Link to comment
Share on other sites

  • 2 months later...

Body Talk

Have you ever wondered why you sometimes take an almost immediate liking to a person you have just met? Or worried about why someone you were talking to suddenly became cool and distant? The chances are that it wasn't anything that was said but something that happened: a gesture, a movement, a smile. Social scientists are now devoting considerable wow power leveling.attention to "non-verbal communication," what happens when people get together, apart from their actual conversation.

Professor Erving Goffman of the University of Pennsylvania is involved in a continuing study of the way people behave in social interaction. He feels that gestures, movements and physical closeness have meaning which the words that the people are using do not carry.

The closeness of two people when talking, movement towards and away from each other, and the amount of eye contract all reveal something about the nature of the relationship between the two individuals. We tend to be only subconsciously aware, if at all, world of warcraft gold,of the various patterns and rituals of social behavior. We expect other people to act according to the same "rules" that we do, so much so that the manners and behavior of persons from another culture can be extremely confusing.

Fox example, North Americans tend to expect more physical distance between two speakers than do Latin Americans. Consequently, when the Latin American seems to be leaning too close, the North American complains of "invasion of his space." The Latin American, on the other hand, often considers the North American to be "cold" or "distant" because he keeps a greater distance between himself and the person he is speaking to. (world of warcraft gold)

Eye contact is one way of measuring the degree of closeness of relationship between two speakers, although there are cultural variations in the meaning of eye contact. In the Middle East, for example, it is considered extremely provocative for a woman to let a man catch her eye, let alone return his gaze. Social psychologist Michael Argyle observes that there is more eye contact between people who like each other than those who are indifferent or hostile towards each other. And the longer the length of the gaze, the more likely it is that the listener is more interested in the person who is speaking, than the actual topic of conversation. Frequently looking down can indicate submissiveness or embarrassment. Looking away repeatedly may express boredom or dislike. Women tend to engage in more eye contract than men, especially when talking to other women.cd keys

But too steady eye contact can make one feel uneasy at times. Most people become uncomfortable under the intense gaze of a stare. One scientist suggests that perhaps one reason that man becomes tense under the force of a stare is in his biological ancestors: in apes, a stare signifies aggressiveness and hostility. The person who insistently fixes his eyes on our face is often more successful in arousing our dislike than impressing us with his directness and sincerity.

Similarly, the smile cannot always be interpreted as a sign of friendliness. The person who smiles almost constantly and with little apparent reason makes us uneasy. Even though he may believe that he is expressing friendliness, he may really seem nervous and tense. In other animals, bared teeth are a warning gesture, a danger sign. Aion gold

Genuine warmth or interest can be revealed in the eyes, suggests Dr. Eckhard Hess of the University of Chicago, who believes that the pupils of the eyes can indicate emotion or interest. The opened pupil tends to be associated with pleasant, satisfying experiences. That special sparkle in the lover's eyes need not be fantasy, for love may make the pupil grow larger. Sometimes when we feel that a person is "warm" or "friendly", it is possible we are reacting to a form of non-verbal communication - his opened pupils.

The next time you are at a party, take note of some of the silent messages being sent around you. Notice which persons seem to draw naturally together to speak, which others try to stay further apart or even avoid meeting each other's eyes. You may find that this silent language is much more fascinating than the actual conversation going on around you.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...