Yes, thanks.

Thanks! My intention is to put everything into the public domain via YT. -- Dave

@@orophilia that is Nobel. If you want to make money on your inventions, you certainly could. You could even make plans and sell those. Get in touch if you want to talk about it. Hans

@@HansHartman i would buy one... haha. i'm not skilled enough to build one of these

@@HansHartman MBMMLLC made a big one of these about 5 years ago, there have been a few other identical small ones over the years as well. Its a good basic design.

very noble of you . Get it done and contact me . I would be honored to be your first customer .. I am serious . love your table ..BRAVO

I have litharge. That's quite a nice idea. -- Dave

Thanks!

@@orophilia 😢

There is a top to the box (not shown) that should protect the electronics. I appreciate your ideas! -- Dave

Yeah, the table is a nice size for the back of a pickup. Thanks for the comment! If you know Jason tell him that I need a bit of that flour. -- Dave

Thanks, Tripp!

This is so cool seeing one of the first table builders I started watching on shaker table builds commenting on another great table builders video. So awesome to see see the mutual respect you 2 have towards each other. Both of you are extremely bright and inspiring guys to watch.

@@f5stwista Yeah, I learned a lot from watching his videos. -- Dave

I grew up outside of Toronto and spent a lot of time with my dad rockhounding around Bancroft. Glad to meet you. -- Dave

@@orophilia I also spent tons of time with the old man prospecting/detecting. I’m on the Island and definitely a pleasure to meet you. Mitch or Rusted ✨

@@RustedPioneering A pleasure, Rusted.

Hi John, Yeah, that's a good plan. Rocks also will work well. -- Dave

Thanks so much for the wonderful offer! At this time I'm not able to run the table, but I should be back in business soon.

@@orophilia The offer stands. Let me know where to send it when you can play with the table again.

Yeah, there are a lot of variations and tunings of this type of table. I've been out of action for a while but I'm getting ready to try several more ideas.

Hi Rick, that would be great. When you get a little bit please let me know. -- Dave

@@orophilia I will contact you next week 🙂

@@rick9297 Super!

I have all the 'footage' to make a build video and I'll be doing that next. I'll include the circuit diagram that I used with the micro and I'll also suggest an easier circuit. -- Dave

Ok, best I subscribe then 😏

Yes, for sure. -- Dave

Thanks, Tom, I'll see if I can figure out how to implement it in the next iteration. -- Dave

Yeah, you can watch the gold marching as you BBQ your T-bone. 😋

@@orophilia oh ya...

Thanks, John.

Flour gold wizards the man hence the name 👍❤️💛💚

@@rastaralph7154 Do you know how to get in touch with him?

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Yes, the motor and controller are homemade. Yes, the pot controls the PWM amplitude (the width of the pulse). I added two other PWM controllers to control the pump and a spare that's not in use. I use 12 V from the battery.

I'm looking forward to it also. I've been working out strategies for larger throughput and I don't see why not. If you find the material then we'll get it done. I don't think a single huge table is the way to go because the weight and cost of the table grows much faster than the throughput. So, there's an optimum size for the table, probably around 3' X 6'. The job then is to engineer a feed system to make it automatic. -- Dave

Good idea. I think I have all the footage to put together a decent build video. I'm a bit under the weather at the moment but I'll start reviewing what I have. Yes, driver-control box is interesting.

I’d love to try to separate it. please contact me at. orophilia.gold@gmail.com

Good comment! Yes, I've done a lot of experiments on this. It's very complicated because the motion of the gold and the separation of the waste depends on so many things including the rate of water flow and its direction, the slope of the table, the type of material, the bump rate and amplitude, etc. So, I've decided to keep the bump direction parallel to the grooves and vary other parameters. Cheers, Dave

I'm travelling, so I have to remember the details without seeing the unit. I didn't count the turns on the coil because I really didn't need to. Counting turns is a pain and I had already estimated the number of turns and the force that would be generated. The inner diameter of the coil is 2 inches and the outer diameter is 3.25 inches. The coil is about 3/4" thick and as I recall it has 8 ohms impedance. The magnets are 3/4 X 1 X 2 (I think, but it doesn't sound right. I'll look it up.) and they are backed by a 1/4" A16 plate. With 12V I would only get 1.25 Amps through the coil (not enough), so I used a step-up switcher to produce 18V for the high-current switch. With that I can get 2 Amps through the coil. I run the table at 5.85 Hz and about 50% on the PWM. I'm an old engineer, so I consider that marginal. I would prefer at least 3 Amps for the coil, i.e., 24 V from the switching power supply. The high-current switch is driven from the microcontroller because I wanted to play with acceleration profiles. The acceleration profile is not needed; in the end I just drive the table one way for half the time and the other way half the time. However, I consider it important to have adjustments for both the frequency and the amplitude. This allows fine adjustments that can really affect the performance of the table. If you are not familiar with programming micros perhaps I can help. I used an ESP32, but that's total overkill, a simple Aduino would do. Be careful with the total moving mass. My table has about 5.5 kg, including everything except the dirt. The bump adjustment is also very important. It's a fun project and after a bit of tuning it works remarkably well. -- Dave

Yeah, I want to do the same thing, remove more of the black sand. I'm working on it slowly, trying to understand the factors that improve performance. There are a lot of adjustments that can be made to the table, and there are three competing desires: High feed rate, high concentration ratio and low gold loss rate. -- Dave

Agreed.

Yes, certainly Aluminum would work. 1/2" thick Al plate would be very heavy relative to plywood. -- Dave

Hello. The grooves are 1/4" wide and 0.09" deep. I've found that that works well for this kind of table. They are completely square x-section but the ends of the grooves that allow the gold to run onto the table have a special profile. I'll cover that in the next video. -- Dave

@@orophilia Thanks a bunch Dave.. i appreciate the reply.. Looking forward to it.. i see you've had alot of videos that my Notifications never gave me.. wtg KZfaq.. haha Really dug your grinder rock crusher design also!!! Good Stuff Dave 👍

@@tadvanallen YT is an enigma, for sure. -- Dave

Hi Jason. Yes, I've tried several small 12V DC motors in the 35 W to 50 W range. I used this style for the first couple of tables that I built. If interested, you can take a look at my first video. I don't know how to use a rotary motor with a bump mechanism. The bump mechanism with the linear motor, with its force and frequency adjustments is a huge improvement for this style of table and I recommend that you find a way to implement it. It makes for an excellent, finely tunable, multiple-purpose table.

Hi Stephen, You'll need 24AWG magnet wire, not speaker wire. When you say you've found code, is that for the Arduino? You'll need a microcontroller to drive the H-bridge switch.

I used 1/2" Baltic birch plywood for the top. The plywood was laminated to a hardwood frame measuring 3/4" X 1.25" and I divided up the internal volume in a 3X2 array with more of the same hardwood frame material. This structure is called a torsion box. It's very stiff and flat.

Howdy. I have a build video coming, so you can take a look at the details. -- Dave

That's super generous of you. Yes, beach and river gold is what I'm looking for to test and tune the machine. Please leave an email at . Just 30 or 50 mg is enough, and good or bad, I'll make a video. The finer the better. -- Dave

Hi GSF. I'm currently running 1/2" per foot back to front (2.5 degrees) and level left to right. I can adjust this for higher feed rates (3.5 degrees) and a slight downhill left to right tilt, or for lower feed rates (1.5 degrees) and slight uphill tilt left to right. The latter works well for cleaning. -- Dave

@@orophilia So is it the BUMP that causes the left to right movement of particles ?

@@mohammednovalija Yes, exactly. The bump is like the tap on the side of a gold pan. It preferentially moves the higher density material. -- Dave

Hi Bob, Thanks so much for the offer, but yes, I have enough for testing. Appreciate it. -- Dave

Hi Stephen. I'm about to publish a video on the construction of the table. Please take a look.

Hi Dave great to hear you will post how to build the table.

The magnets are 2" X 1" X 0.75" N52 Neodymium Iron Boron. The coil is 0.5" thick and has an inner diameter of 2" and an outer diameter of 3.5". The wire is #24 AWG and the coil resistance is 10 ohms. I have a complete build video coming so stay tuned. -- Dave

@@orophiliathanks I’m ready to order parts this is a great design.

I can run the motor for hours at full current without overheating. That's 1.8 amps at 18 V, or roughly 32 Watts. I run the table at about 6 Hz bump rate. -- Dave

Thank you Dave for responding . Ray

I use ChatGPT all the time now. I'm very careful to check the answers.

I will be out of touch for a while, but when I'm back in business I'll send you a message by this comment. I'd love to run some of your material to see if the machine will work for you.

Good morning! All good questions. The grooves may not be optimized but they do work. -- Dave

@@orophilia i see they work XD i was thinking if making them longer would not help with bringing more concentrate to the right corner, longer route for it to interact with waater and beeing shaken could lead to better separation in my mind. I am very curious, because i see potential for home PCB refining, and other electroscrap XD And this bump and low frquency is crucial? vibration motors work worse?

@@ejkozan The bump motion is the critical part. The velocity at the time of impact determines the distance that the gold and other material moves per bump. The rate of bumping determines the overall rate that material is transported. The water flow and table tilt determine the rate that the material flows downward into the tailings tray. All the possible adjustments interact with each other. -- Dave

@@orophiliainteresting. i am asking because mbmmllc's shaking tables seems too use only vibration and your is different. i expect it exploits inertia of particles when bump (sudden braking of table) happens. a bit like tapping of panning bowl

@@ejkozan It's my understanding that the mbmmllc tables rely on a different principle, i.e., the flexures are angled backwards and the table is driven sinusoidally with an electric motor. See my very first video on this channel.

There are shaker tables on the market. I would do an internet search.

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I used two LCD displays with 172x320 resolution because they were hanging around. An easy and cheaper way is to use a microcontroller with an integrated display like the Lilygo T-Display-S3 or similar. Be aware that there's a lot to do to program these micros.

Sorry, but I don't sell them. -- Dave

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Hi Gary, Not at the moment. I'm still working on it but when it's done I'll give your question some consideration. -- Dave

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I'd love to have a bit of the crushed ore. Thanks so much. Please contact me at

Hi Drew, Yes you are right. There is a tradeoff between table dimensions, feed rate, concentration ratio and efficiency. Each table can be set up to optimize for feed rate, concentration ratio (purity) or efficiency (loss rate). Larger tables can have better performance in any (or all) of these categories and the expense of size and weight. -- Dave

@@orophilia Maybe you could put a neo magnet on an angle under the table to catch a lot of black sand.

@@drewconrad7093 Yeah, that works but it's a lot of trouble and it only catches the magnetic stuff, leaving over half of the fine black sand anyway. -- Dave

Sorry, I don't make these for sale.

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That is a great idea! I'm going to try it right now.

Thanks, but I now have enough fine gold for testing.

I buy the Neoprene rubber sheets from Rubber Sheet Warehouse and I cut the grooves with a router.

@@orophilia How did you determine the spacing, depth and various angles that you cut out of the rubber mat. I would greatly appreciate a picture to some scale so I could cut my own.

@@tomsmith295 Hi Tom, Please see my latest video. It shows all the steps involved in cutting the grooves in the plywood. If you have further questions, please ask. -- Dave

Hi Rys, Please email me at Orophilia.gold@gmail.com

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Sure. I have a build video coming. -- Dave

I've tried to contact Jason at FGW without success. -- Dave

Thanks, Steven. I'm still working on the design, but I may have something in the future. Or, maybe someone else will pick up the ideas and make a product out of it. -- Dave

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Hi Brian, I'm thinking about this carefully. I believe the table would have to be made out of something more durable than wood to have some confidence in its reliability for field use. For me it's OK. If it breaks I'll fix it, but to sell it is another story entirely. I'm not yet sure what materials are suitable but I'll continue to work on it. Thanks so much. -- Dave

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Thanks, I've been trying. -- Dave

Sorry, I don't make these for sale.

Hi Fringe, Sorry, I don't plan on selling the machine. It would need a lot more work to make it a product, and the field reliability would need to be tested. I don't think it would survive long as it is, made from plywood. -- Dave

@@orophilia well it looks great. Good job!

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Hi Kevin. Sorry, I don't sell the table.

@@orophilia would be interested in making one for me?

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May have some desert sand that I have not run yet that always has micro gold in it

@@DwanParsons-ei5fl Wow, that would be wonderful. Please send an email to me at orophilia.gold@gmail.com. Thanks so much!. -- Dave

Thanks.

I will be ready in a couple of weeks. -- Dave

@@orophiliao ok I be in bodfish let me know when you free