Author Topic: Tower Spherical Engine (3d print project)  (Read 864 times)

Offline BillTodd

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Tower Spherical Engine (3d print project)
« on: November 13, 2018, 09:07:03 AM »
This started a decade or more ago when I animated the engine for Doug's museum of retrotech  (http://www.douglas-self.com/MUSEUM/POWER/tower/tower.htm). I have been wanting to build a physical model ever since.

The bulk of the engine will be 3d printed , mainly because making the spherical parts would require special tooling that I don't have. The other bits are all available on ebay ,so it should be possible for others to make the model .

The model engine is designed to run from a vacuum cleaner , to avoid the need to contain any serious pressure.

I started converting an old engraver project (itself made from an old plotter project) into a 3d printer (https://madmodder.net/index.php/topic,11263.msg152896.html#new) a few years ago and I'm still have some problems getting flat prints. On top of that an update has buggered my copy of the Marlin 3d print software (any Marlin/Arduino experts here?) and now it will not compile.


.
« Last Edit: November 13, 2018, 09:28:41 AM by BillTodd »
Bill
wy omnibus Latinis taurus stercore?

Offline AOG

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Re: Tower Spherical Engine (3d print project)
« Reply #1 on: November 13, 2018, 02:12:35 PM »
Thatís a very interesting design. I will be following along. On the Marlin issue, most of the time I have problems compiling marlin is because I forgot to include the U8Glib library that runs the display. For your flat print issues, turn on Manual mesh leveling in Marlin and use a raft. There is a tutorial here  https://www.printedsolid.com/blogs/news/installing-marlin-1-1-6-on-your-cr-10s-with-mesh-bed-leveling. Itís intended for the Creality CR-10 but it may still be worth a look.

Tony

Offline BillTodd

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Re: Tower Spherical Engine (3d print project)
« Reply #2 on: November 15, 2018, 10:15:04 PM »
Thanks Tony.

I managed to get Marlin compiling again (just a matter of deleting the old U8lib and reinstalling).

I'll have a look at that tutorial,  my bed is reasonable level but the problem I've been having is warping due to the bed heater not working (actually it does work but somehow trips the power o/p off at random!)

I'm now updating my model to add some extra clearance based on the prints I've made.

Bill
Bill
wy omnibus Latinis taurus stercore?

Offline BillTodd

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Re: Tower Spherical Engine (3d print project)
« Reply #3 on: November 21, 2018, 08:30:37 PM »
Well printer is up and running again. Currently 3 hours into a 12 hour print of the base unit

update in 9 hours or so
Bill
wy omnibus Latinis taurus stercore?

Offline ddmckee54

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Re: Tower Spherical Engine (3d print project)
« Reply #4 on: November 21, 2018, 08:52:35 PM »
Bill:

Just for giggles and grins, what sort of extra clearance have you found that you need to add?

Don

Offline BillTodd

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Re: Tower Spherical Engine (3d print project)
« Reply #5 on: November 21, 2018, 09:10:59 PM »
on the central jointed parts I've given it 0.4 mm (0.2 on each part) result is a bit tight and requires some fitting.

I'm not too worried about clearance or leakage as the vaccum cleaner power will happily deal with the extra flow. It'll be important that the clear plastic sphere is not scratched by the spinning bit.

I intend to make a couple of complete engines before releasing the stl files , somanone should be zble to build it without the need for filing and sanding.

Bill
Bill
wy omnibus Latinis taurus stercore?

Offline BillTodd

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Re: Tower Spherical Engine (3d print project)
« Reply #6 on: November 22, 2018, 08:38:33 AM »
Well that worked better than expected :-)

Bill
wy omnibus Latinis taurus stercore?

Offline Admiral_dk

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Re: Tower Spherical Engine (3d print project)
« Reply #7 on: November 22, 2018, 11:13:29 AM »
Looks fine so far  :ThumbsUp:

Did you print the sphere too ?

Offline BillTodd

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Re: Tower Spherical Engine (3d print project)
« Reply #8 on: November 22, 2018, 07:01:39 PM »
Looks fine so far  :ThumbsUp:

Did you print the sphere too ?

The sphere is an ebay item - christmas decoration I believe


Anyway...

The rotor fits sort of - could do with a little extra end float (bearing placement is a bit tight)

Ebay 608 bearing are serious crap - I wondered why they were loose on my 8mm shafts (thought I'd pick up some 5/16" rod instead) the 8mm ID is actually 8.15 !!
Bill
wy omnibus Latinis taurus stercore?

Offline BillTodd

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Re: Tower Spherical Engine (3d print project)
« Reply #9 on: November 24, 2018, 01:08:18 PM »
it spins!

Bill
wy omnibus Latinis taurus stercore?

Online sco

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Re: Tower Spherical Engine (3d print project)
« Reply #10 on: November 24, 2018, 05:04:32 PM »
Very interesting engine Bill and clever work with the 3d printer to realise it.

Simon.
Ars longa, vita brevis.

Offline KB

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Re: Tower Spherical Engine (3d print project)
« Reply #11 on: November 24, 2018, 06:54:19 PM »
What a neat design!

Offline BillTodd

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Re: Tower Spherical Engine (3d print project)
« Reply #12 on: November 25, 2018, 02:54:19 PM »
It works....


Not the most efficient model ever created (800w input for almost zero out)  but  we have a gas pressure engine :-)


ATM there's probably too much clearance between the sphere and the valves so air is leaking around the wedge shaped Rotors reducing the pressure across the yellow separator/piston.

And , for some reason it'll just jam after a while and then clear itself

 
Bill
wy omnibus Latinis taurus stercore?

Offline Jo

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Re: Tower Spherical Engine (3d print project)
« Reply #13 on: November 25, 2018, 04:19:17 PM »
8) Nice.

Jo
Usus est optimum magister

Offline Ye-Ole Steam Dude

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Re: Tower Spherical Engine (3d print project)
« Reply #14 on: November 25, 2018, 05:43:03 PM »
Hello Bill,

Most unusual and interesting, but neat to watch it run.

Have a great day,
Thomas