Powering a 12 ton boat; need advice on big DC motors - Page 4 - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
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post #46 of 54 Old 07-02-2019, 10:25 PM
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Re: Powering a 12 ton boat; need advice on big DC motors

Quote:
Originally Posted by TUDOR View Post
It's just that you have a tendency to make it look like a manufactured piece as well as being functional, while I tend to stop when it can actually do the job.
And the amazing thing is, while he is doing one, he also does the other. Manages to do both things at the same time.
An ability (gift) I do not have.

I'm more about make it fit, make it work, grind it down, weld it up, good enough. I'll make it pretty later, if I have to. I guess.

Sent from my DELL WS650 Desktop PC, by tappity tap tap'n on the keyboard. And which not even once have I dropped down the hole in the outhouse.
Utility before aesthetics.

Craftsman GT Model: 917.251522, 46” Deck w/ CV20S Kohler, Built 1996, Hydro trany, lever control.
Craftsman, Model: 842.242560, 46” Snowblower attachment. Heavy and noisy.
Craftsman, Model: 917.249740, 3 bin, Hard side Bagger.
Murray LT Model: 425618x48B, 18hp B&S, 42" deck, 2004, Hydro trany., foot control. My Mower
Murray RER, Model 30550H, 1999, 10 hp Tecumseh, 30” cut, single blade. My trimmer.
Murray, Noma Model: 633124X8, 12hp Tecumseh OHSK120, 33", 1997, Walk behind snow blower.
MTD Snowblower Model: 317E150-129, 139cc / 21”, 1996 My “Power Shovel”.
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post #47 of 54 Old 07-02-2019, 10:33 PM
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Re: Powering a 12 ton boat; need advice on big DC motors

Ooops, Sorry Mark, looks like I named you Mike in earlier post.
But, hey? The post fit and worked, message got across.
Now I just have to work on making it pretty.

Sent from my DELL WS650 Desktop PC, by tappity tap tap'n on the keyboard. And which not even once have I dropped down the hole in the outhouse.
Utility before aesthetics.

Craftsman GT Model: 917.251522, 46” Deck w/ CV20S Kohler, Built 1996, Hydro trany, lever control.
Craftsman, Model: 842.242560, 46” Snowblower attachment. Heavy and noisy.
Craftsman, Model: 917.249740, 3 bin, Hard side Bagger.
Murray LT Model: 425618x48B, 18hp B&S, 42" deck, 2004, Hydro trany., foot control. My Mower
Murray RER, Model 30550H, 1999, 10 hp Tecumseh, 30” cut, single blade. My trimmer.
Murray, Noma Model: 633124X8, 12hp Tecumseh OHSK120, 33", 1997, Walk behind snow blower.
MTD Snowblower Model: 317E150-129, 139cc / 21”, 1996 My “Power Shovel”.
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post #48 of 54 Old 07-04-2019, 02:06 PM Thread Starter
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Re: Powering a 12 ton boat; need advice on big DC motors

Gee shucks, I don't know what to say now...

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post #49 of 54 Old 07-30-2019, 04:00 PM Thread Starter
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Re: Powering a 12 ton boat; need advice on big DC motors

I've been working in it some more; it have to get it crated and shipped in a couple of weeks.

It needs a subshaft; the total reduction is 5.3/1
The gear was on a transmission shaft that's VERY hard, so I cut it off and welded it to this 30mm mild steel rod.

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I had the hub sent from Holland; making a flange to fit the large gear I took out of a friend's car 15 years ago.
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To help keep things cool, I smeared heat sink compound over the field coil armatures. Hopefully a lot of heat will go to the water jacket instead of heating the air that the armature needs.
Then copper grease on the screw threads and a little dab of permatex on the mating surface to keep the water on the right side.

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Pressure testing the water jacket.
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Water cooling plate for the electronic speed control
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Pulleys + gears
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Pressing on the pulley flange;
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Pressing on the fan adapter shaft;
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I made 2 extra connection bolts to make the series motor reversible. The connection plate already had the holes in it for them.
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with fan mounted; I pulled the cage from a 1/2HP ventilator I had on a shelf for the last 15 years.
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This is for the 'throttle', I'm adapting an industrial safety switch box to rotate a potmeter.
Could be overkill, but I had it lying around and it has a nice SS shaft with rotation limit ears already on it.
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I made a little brass knob for the potmeter; ratio is calculated to get me the correct resistance range.
It looks fancy but this was quick work.
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This is a pain of a job; cutting a slot for the belt tensioner. I want a milling machine!
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Lining up the subshaft tube with a laser. finicky work but it has to be done.
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Getting it into position with the lights on.
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All done; the bolts will be replaced with countersunk allen screws when they get here.
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Now to get started on the electrics.
CHEAP! this power meter cost 15 euros, and the same again for a 500A shunt. The thermometers were 10 euros for 5 of them. I made a 1.5V regulated power supply from parts I had leftover, so they won't need the little button cells.
One thermometer for the cooling air, the other for the water jacket.
In the picture I have it connected to my car battery for testing, but it will be a 48V system
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I made this holder for the air temp sensor from scrap polycarbonate.
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The one for the water jacket I made from brass and soldered in. this went easy.
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I bought 2 of these 24V pumps from ebay, 8 euros each. I didn't realize they were so small; but I tested one and it performs as advertised. For how long? who knows.
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Last edited by Mark in Portugal; 07-30-2019 at 04:06 PM.
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post #50 of 54 Old 07-30-2019, 04:11 PM
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Re: Powering a 12 ton boat; need advice on big DC motors

You're making great progress! I'm looking forward to seeing a video of the boat working.

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post #51 of 54 Old 07-30-2019, 05:28 PM
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Re: Powering a 12 ton boat; need advice on big DC motors

You’re just on another level is all I can say.
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post #52 of 54 Old 07-31-2019, 06:01 PM Thread Starter
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Re: Powering a 12 ton boat; need advice on big DC motors

Thanks guys;
I expect to mount it in the boat in September, and hopefully I can test it at 1/2 power with a pair of starting batteries I have.

I don't plan to buy the real battery until next year.

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post #53 of 54 Old 08-03-2019, 07:25 PM Thread Starter
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Re: Powering a 12 ton boat; need advice on big DC motors

I woke up in the middle of the night with the realization that the pinch bolt and slotted plate I made can not hope to hold the tension of the belt with 12HP on it.
So after a lot of thought, I made this from a couple of old head bolts and stuff.
The hex nut material is really hard, I don't know where it came from. I can only cut it with carbide.
Cutting the internal threads [1 right, 1 left] was a challenge to my abilities.

https://www.mytractorforum.com/attac...389347&thumb=1
https://www.mytractorforum.com/attac...389345&thumb=1
https://www.mytractorforum.com/attac...389343&thumb=1

And I made the pivot mount and rod that will be welded into the boat. In the foreground is a jig foe lining up the pivot shaft before welding; the idea is to clamp it to the prop flange, fast work.
I hope.
https://www.mytractorforum.com/attac...389349&thumb=1
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post #54 of 54 Old 08-18-2019, 02:57 PM Thread Starter
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Re: Powering a 12 ton boat; need advice on big DC motors

I got the last of the parts; copper bar for the connections, allen screws for the pulleys, 500A main fuse, and some brass nuts + bolts.
Just in time to ship it out to the boat with the 1965 Mercedes diesel engine I rebuilt over the summer.
The shipper should have picked up Friday, but the driver went to the another town with a similar name [again] 40 miles from here.
I realize now; the driver can't read.

All connected, British made 240A reverse relay and US made electronic speed control box.
I put heat shrink tube around the copper bars.

The assembled motor unit weighs around 60kg [132 lbs]
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I made the crate from a dead pine tree I cut from my forest. It has sides too.
A tall narrow crate is cheaper to ship than a wide low one. They go by floor space.
Extra weight doesn't add any cost until 350kg [around 800lbs.]

Truck should come for it tomorrow [Monday].
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