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Author Topic: This Ertl will actually pump  (Read 2693 times)

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This Ertl will actually pump
« on: April 16, 2021, 01:35:41 pm »
So I have been getting into a modification of an ertl water pump, and decided that I really wanted it to pump. The modification to run on drive belt was quick and easy, but modifying the internals will be far more complicated. [ Guests cannot view attachments ] [ Guests cannot view attachments ] [ Guests cannot view attachments ] [ Guests cannot view attachments ]   I made a 3d model of the crazy part needed to transfer power to the bottom, and printed it out in a few minutes on a 3d printer. (I work as a tooling designer, so I just designed it on a lunch break) It was a little sticky, but after "wearing it in" it slides pretty smooth. I then drilled the spout out by hand, and each of the oil cups. My plan is to run a 1/8" copper tube up inside the pump up to the spigot, and my plastic part leaves just a little bit of room for that. I have not designed the pump mechanism at all, but I think I can make the pump from a spray bottle work. it will just need to fit in the die cast base of the toy. Anyone else tried to do this? id love to hear thoughts for how to make the pump under the base.
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Re: This Ertl will actually pump
« Reply #1 on: April 16, 2021, 02:23:12 pm »
watching with intense interest , your on your way to something really special.
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Bruce, St. Paul Indiana, USA
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Re: This Ertl will actually pump
« Reply #2 on: April 16, 2021, 03:36:29 pm »
Ooooh…..very interesting.

Looking forward to seeing more.
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Re: This Ertl will actually pump
« Reply #3 on: April 16, 2021, 05:22:01 pm »
If you can make it pump with 3D printed parts...you could probably sell them! There are several of us on here that have Ertl pumps and they are good lookers, but more joy could be had if they lifted water!
   I was going to have a go at it but have not had time to even take my pump apart.
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Re: This Ertl will actually pump
« Reply #4 on: April 16, 2021, 06:24:14 pm »
As the others have mentioned really interesting.
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Re: This Ertl will actually pump
« Reply #5 on: April 17, 2021, 02:58:01 am »
Seems like a relatively advanced set up your planning for here, will be looking forward to see you progress.
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Re: This Ertl will actually pump
« Reply #6 on: April 18, 2021, 06:07:53 pm »
Well I happened upon another pump at an estate sale, in the box! They had 20 and I talked them down to 10 with some dvd's! I modified one of Jin's hit and miss engines for my dad as a gift, and I think this will be the follow up gift for this Christmas :)
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Re: This Ertl will actually pump
« Reply #7 on: April 18, 2021, 06:40:36 pm »
Well I happened upon another pump at an estate sale, in the box! They had 20 and I talked them down to 10 with some dvd's! I modified one of Jin's hit and miss engines for my dad as a gift, and I think this will be the follow up gift for this Christmas :) [ Guests cannot view attachments ]
I also found a pump! Got some inspiration from my dog chewing a squeaker for a few hours. Not sure how long one will last before wearing out,but the squeezers are easy to press and should connect to some check valves pretty easily.
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Re: This Ertl will actually pump
« Reply #8 on: April 18, 2021, 07:29:53 pm »
That's a SWEET price for Ertl pump in a box!
  I think the squeaker could last for some time if it is not depressed with a sharp metal object, maybe something like a dart gun suction cup or something soft on your vertical plunger as a cushion?
   The squeaker will likely make good water pressure on the down stroke, I am unsure if it will have a lot of strength to draw in the new water so a check valve with very easy open strength will be needed. Are you going to make your own check valves?
  Keep us posted if you make any progress.
  I see the edge of a Tarot Stirling engine...nice choice! I have one on order myself :)
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Re: This Ertl will actually pump
« Reply #9 on: April 21, 2021, 10:19:34 am »
So yesterday over lunch I designed this little "pump" to fit in the base of the ertl. The sqeeker bulb will have a tube to a Tee on the far side of the base, where the check valves will be connected. I am planning to use these check valves: https://www.amazon.com/gp/product/B08GLXZJCW/ref=ppx_yo_dt_b_asin_image_o02_s00?ie=UTF8&psc=1
Mainly because they are small, but can be disassembled if they plug up. They are normally used for aquarium air lines to make sure siphons don't happen. The base I designed should hold the bulb, check valves, Tee and tubes and I will need to do a bit more planning for how the water will enter the base of the pump. I started the print when I went to bed last night, and woke up to a complete part. Unfortunately the squeeker bulb is too compressed when assembled, so I will need to either use a different bulb, or plan to put this project on another base to allow a little more room under it. Also, the bulb is centered under the "pusher" and this leaves no room for a little copper tube, so I will plan to move the bulb a bit to make room.

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Re: This Ertl will actually pump
« Reply #10 on: April 21, 2021, 05:53:02 pm »
 So the valves and Tee came in the mail today, so I went ahead and gave it a test run. It works great! the squeaker is pretty slow to refill, but that is okay, as I don't plant to use all but the last 25% of the down stroke, so it will have a good bit of time to rebound. I don't plan to put any kind of air ram in it, so the output will be pulsed. On the other hand I just realized I will be able to use this to keep pumping air into my fish tank if/when my power goes out.... I don't think I have ever had a practical use for any of my engines, so that is pretty neat lol. The second version of the pump plate is on the printer, just need to wait 2 hours...
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Re: This Ertl will actually pump
« Reply #11 on: April 21, 2021, 07:45:07 pm »
Just wanted to say that I’m really enjoying this  8)  Some very clever modding and I hope it ends up working  8)
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Nick

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Re: This Ertl will actually pump
« Reply #12 on: April 21, 2021, 08:02:39 pm »
This is going to be a very and very unique accessory.
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Re: This Ertl will actually pump
« Reply #13 on: May 05, 2021, 12:37:14 pm »
Got a little bit more done. Not really to do with the pump, but a little toy to work with it. I printed out the little tray and trough, cut out some cross stitch plastic mesh, and plan to put some small gravel on it. Water should be able to fall through to the tray and get pumped back out. I also want to make the device that would hang from a pump that connects to a tube. Not sure what it is called, but I think it would be interesting to have this pump fill the trough [ Guests cannot view attachments ] [ Guests cannot view attachments ]
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Re: This Ertl will actually pump
« Reply #14 on: May 05, 2021, 12:41:24 pm »
Meant to attach this pic too, you can kinda see the detail of how the mesh is held above the tray. Should be able to hold a fair bit of water under the gravel
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