Miller table size

[A#1]

I'm about to start making a miller table.....

How big should I make it?

 

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[RTR]

Now, this board here.....Is it just like a water gate?

Space it up "a couple nickles"?

Adjust the water speed accordingly to keep the box behind it regulated?


Having some issues with the pic

Thats correct,At least thats how I designed the table.Ill see if I can find a better pix. of it

 

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[A#1]

View attachment 1722805 Thats correct,At least thats how I designed the table.Ill see if I can find a better pix. of it

Awesome, thanks.

 

[RTR]

Now, this board here.....Is it just like a water gate?

Space it up "a couple nickles"?

Adjust the water speed accordingly to keep the box behind it regulated?


Having some issues with the pic

View attachment 1722805 Thats correct,At least thats how I designed the table.Ill see if I can find a better pix. of it on the right you'll see wooden dowels glues in place.For the 'dam' board to slide up & down .This allows for easy change of water flow down the table.
But through trial & error i found the best water flow to be 2 nickles high.(that's with a 4" drop over the 4 ' table length,and using This size pump).

 

[A#1]

I was wondering if I would want it to be adjustable, or hard mounted

Do you change it often?

 

[RTR]

I was wondering if I would want it to be adjustable, or hard mounted

Do you change it often?

In the beginning i changed the height often to get it correct,But i don't anymore. So you could probably skip that .Cause now the 'proper height' is known.FOR this particular table & pump combo

 

[RTR]

different view while being built

 

[A#1]

In the beginning i changed the height often to get it correct,But i don't anymore. So you could probably skip that .Cause now the 'proper height' is known.FOR this particular table & pump combo

I suppose I imagined more of a hardmounted, set height for a desired water depth.

Then adjusting the pump flow for proper performance.

 

[RTR]

I suppose I imagined more of a hardmounted, set height for a desired water depth.

Then adjusting the pump flow for proper performance.

that will work

 

[arizau]

A bottom outlet for water flow is uncontrollable (unknown until you try it) unless the "gate" can be adjusted. I would eliminate the bottom gate idea and make a dam (shorter then the sides and back) where water is forced to flow over the top of the dam as the reservoir over fills. Water seeks it's own level so it will overflow evenly across the width of the dam if it is set up level to begin with and you can infinitely adjust just how much that flow is (the water depth on the table itself) by adjusting how fast the reservoir is filled. There should be little to no turbulence at the base of the dam and what little there may be will settle down in a very short distance as the water levels out across the bed. Water speed can be adjusted by adjusting table angle Kind of the KISS method IMO.

Good luck.

 

[A#1]

Seems to me that a bottom outlet for water flow is uncontrollable (unknown until you try it) unless the "gate" can be adjusted. I would eliminate the bottom gate idea and make a dam (shorter then the sides and back) where water is forced to flow over the top of the dam as the reservoir over fills. Water seeks it's own level so it will overflow evenly across the width of the dam and you can infinitely adjust just how much that flow is (the water depth on the table itself) by adjusting how fast the reservoir is filled. There should be little to no turbulence at the base of the dam and what little there may be will settle down in a very short distance as the water levels out across the bed. Kind of the KISS method IMO.

Good luck.

I reckon that makes some sense too. Decisions, decisions.....

 

[RTR]

the idea of the Dam is to smooth out the water(eliminating bubbles and waves)while its just leaving the reservoir.

 

[arizau]

A dam overflowing evenly will not create that scenario unless it is tall and fast flowing.

 

[RTR]

Build one & let me know .Been there ,did that.
A#1....Also don't forget the 'slot' on the table.Its the width and depth of a table saw blade. About 8" downstream from the Dam.It will catch all the small gold.

 

[A#1]

seems like an underflow dam would create a more stable, easier to construck reservoir behond it.

 

[arizau]

Both are equally easy to construct. The difference is that one is only going to flow a pre-set amount of water (maybe too little, maybe too much) depending on the dimensions of the opening once the reservoir level is set unless that opening is adjustable. The other has flow regulated by a valve, which you will have to use anyway, so volume of flow, depth across the table, is adjustable without experimenting with different sized openings. No matter what design you choose, make sure that you tightly classify the feed so that gold is king.

Good luck.

PS In either instance, introduce the water into the reservoir evenly across and under the water fill level to prevent bulging and/or bubbles.

 

[A#1]

Both are equally easy to construct. The difference is that one is only going to flow a pre-set amount of water (maybe too little, maybe too much) depending on the dimensions of the opening once the reservoir level is set unless that opening is adjustable. The other has flow regulated by a valve, which you will have to use anyway, so volume of flow, depth across the table, is adjustable without experimenting with different sized openings. No matter what design you choose, make sure that you tightly classify the feed so that gold is king.

Good luck.

PS In either instance, introduce the water into the reservoir evenly across and under the water fill level to prevent bulging and/or bubbles.

In the type of reservior/dam system you speak of....What dam height would you suggest?

Or could you perhaps give a photo or illustration of it?

I understand the principal of what you're saying, but not quite how to build it yet.

 

[arizau]

The dam can be about 1/2" shorter than the height of the walls since the flow down the table during operation will always be less than that. Bevel the bottom so you can install the dam slightly slanted backwards so when you tilt the table the water will still flow down the dam rather than free falling. If you don't bevel then just make sure the high point is still at about 1/2" shorter than the sides when installed and fill the void at the base.

 

[A#1]

Build one & let me know .Been there ,did that.
A#1....Also don't forget the 'slot' on the table.Its the width and depth of a table saw blade. About 8" downstream from the Dam.It will catch all the small gold.

I like the slot, do the sands clear out well enough?

 

[A#1]

The dam can be about 1/2" shorter than the height of the walls since the flow down the table during operation will always be less than that. Bevel the bottom so you can install the dam slightly slanted backwards so when you tilt the table the water will still flow down the dam rather than free falling. If you don't bevel then just make sure the high point is still at about 1/2" shorter than the sides when installed and fill the void at the base.

Something like this? With say, a 1.5" wall, and a 1" dam.

 

[arizau]

You got it.