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Author Topic: Inch per foot / degree?  (Read 11707 times)

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Offline BCGQC

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Inch per foot / degree?
« on: May 02, 2014, 06:14:01 PM »
How many degree is one inch per foot?

Offline J-Bear

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Re: Inch per foot / degree?
« Reply #1 on: May 02, 2014, 06:48:32 PM »
4.76 degrees

Offline mcbain

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Re: Inch per foot / degree?
« Reply #2 on: May 02, 2014, 07:07:23 PM »
Hi I would have guessed 5 .Not up on my math any more.Easy way too work out is a large peice of card board and a cheap protractor.Draw a 90 degree line.measure out 4 ft. measure up 4 inches and draw line back to center of your 90 and connect the dots the protractor will tell you the degrees.Can do same with a Ranger compass.Luck Mcbain
I started out with nothing Istill have most of it.

Offline J-Bear

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Re: Inch per foot / degree?
« Reply #3 on: May 02, 2014, 07:21:48 PM »
I just used a computerized right angle calculator and inputed the 1 and 12 .
To me rise over run is an easier way to determine slope. I made up a jig and just position it on my sluice so it is an automatic 1 in 12 when the bubble is centered.
JR

Offline directmule

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Re: Inch per foot / degree?
« Reply #4 on: May 02, 2014, 07:57:26 PM »
I kept a copy of this, don't remember where I got it:

Here are a few angles and degrees
1" drop in 12"              4.76  Riffles happy
1.5" drop in 12"           7.12  Riffles need slower water
2" drop in 12"              9.45  Deeper riffles needed but may start to flush if you stop the material flow
2.5" drop in 12"          11.70  Vortex mat starts working well
3" drop in 12"             14.03  Vortex mat happy
4" drop in 12"              Everything flushes out

Offline JOE S (INDY)

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Re: Inch per foot / degree?
« Reply #5 on: May 02, 2014, 08:00:39 PM »
OK - think it out:

12" run with 12" rise = 45 degrees (the old "Right Isosceles Triangle" - remember?).


1" rise in 12 inches equals that 45 degrees divided by 12.  Comes out to 3.75 degrees for each inch of rise.


To prove it - multiply 3.75 degrees times 12. 

  nerd$#@  Joe   <-party->
Wiser Mining Through Endless Personal Mistakes


Offline HeavyMetalX

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Re: Inch per foot / degree?
« Reply #7 on: May 03, 2014, 06:20:17 AM »
This angle is only a rough guideline.... if your pump is not giving the right gph, then things have to be adjusted there as well... basically ya get close, and then watch your riffles for a few... if things are scouring out and are loading as should, then all is good, keep shoveling.

Offline SnowSpider

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Re: Inch per foot / degree?
« Reply #8 on: May 03, 2014, 07:09:13 AM »
So many variables too deal with  .. riffle size,sluice angle,water velocity,sluice width size, i just use my gut feeling for sluice set up you wont find a level,adjustable square,protractor,plumb bob,or ruler in any of my equipment boxes LOL ... your sluice will talk too you if you listen too it... I tryed going with angles and all that other stuff never worked for me .like the Gold Miner spiral wheel they send a piece of cardboard cut too the angle you need too run it  LOL no one told the river cons or gold here in Alberta thats how there supposta react LOL and if the water is muddy   ... sheesh .   Best way too set up a sluice is too use it lots and get too know what your sluicing.. the angle will work itself out ... dont forget too test your tailings, the gold is not lost if it gets washed out  its just in a pile 4 feet away  LOL
Cold Wet and Tired aint Prospecting Fun??

Offline gagoldguy

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Re: Inch per foot / degree?
« Reply #9 on: May 03, 2014, 09:34:12 AM »
Best page on the internet......

pitch to angle convert

You'll play with it for hours.
Kind of like a cat watching fish in the bowl.

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