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| Re: Anyone every tried to mate something like this to the Onan? [message #226919 is a reply to message #226918] |
Thu, 24 October 2013 18:51   |
Otterwan
Messages: 946
Registered: July 2013
Location: Lynnwood (north of Seattl...
Karma: 0
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| Loffen wrote on Thu, 24 October 2013 16:39 |
Does not the onan run just under 2000 rpm ? those heads need 3600 rpm and that might be to much for the onan.
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Good point. One of the beauties of the Onan is that it lopes along at 1800 RPM.
1977 Birchaven, Lynnwood WA - "We may not be able to stop all evil in the world, but I know that how we treat one another is entirely up to us."
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| Re: [GMCnet] Anyone every tried to mate something like this to the Onan? [message #226935 is a reply to message #226922] |
Thu, 24 October 2013 20:47 |
Jim Miller
Messages: 501
Registered: March 2008
Karma: 10
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On Oct 24, 2013, at 7:55 PM, Robin Hood wrote:
> Just gear it up so that the generator head turns at 3600 whilst the Onan is turbing over at 2000.
Are you serious?
Have you evaluated the engineering time and cost of implementing a 1:2 speed increaser just to make it possible to use the $400 Northern alternator? Ever heard the racket made by such a machine? Not only will you need a gearbox to "gear it up" but you'll also need intermediate shafts, couplings, tapers and also a mounting fixture for the new alternator to bolt to.
By the time you do all that you could have just fixed the fields for a few hundred bucks and had a quiet, bulletproof machine with several fewer points of failure compared to a frankenstein botch job.
--Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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| Re: [GMCnet] Anyone every tried to mate something like this to the Onan? [message #226943 is a reply to message #226935] |
Thu, 24 October 2013 21:33 |
Robin Hood
Messages: 1078
Registered: April 2011
Karma: 3
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Nope, haven't considered it. Not a mechanical engineer. But it ought to be
possible with off the shelf parts (two proprly sized pulleys and a
belt) from Grainger and a bit of metalwork. Isn't this one of the most
basic problems in engineering? Take the output from shaft x and use it to
drive shaft Y?
It may not be necessarily advisable or economical or even quiet, mind you,
but it should be possible and somewhat straightforward. But I'm no engineer
so I could be missing something important. :)
So how is that Onan field rewinder project coming along? Is it really going
to be a few hundred dollar price point? That would be awesome and a huge
help to keeping these things running.
On Thursday, October 24, 2013, Jim Miller wrote:
> On Oct 24, 2013, at 7:55 PM, Robin Hood wrote:
>
> > Just gear it up so that the generator head turns at 3600 whilst the Onan
> is turbing over at 2000.
>
> Are you serious?
>
> Have you evaluated the engineering time and cost of implementing a 1:2
> speed increaser just to make it possible to use the $400 Northern
> alternator? Ever heard the racket made by such a machine? Not only will you
> need a gearbox to "gear it up" but you'll also need intermediate shafts,
> couplings, tapers and also a mounting fixture for the new alternator to
> bolt to.
>
> By the time you do all that you could have just fixed the fields for a few
> hundred bucks and had a quiet, bulletproof machine with several fewer
> points of failure compared to a frankenstein botch job.
>
> --Jim Miller
> 1977 Eleganza II
> 1977 Royale
> Hamilton, OH
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Robin Hood
Jackson, MS
2013 Subaru Outback "Top Flight"
1968 Pontiac Catalina "The Cheshire Cat"
1978 GMC Royale motorhome "Pinto Bean"
1977 GMC Palm Beach motorhome "Barn Queen"
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| Re: Anyone every tried to mate something like this to the Onan? [message #227014 is a reply to message #226916] |
Fri, 25 October 2013 12:42 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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At 30Hz my Hammond synchronous clock will run at 1/2 speed so I'll have twice as much time !!
Not only the previous mentioned problems but depth would add into a problem. The belt idea would be simplest but have height dimension problems. A rewound field would outlast all of us on the forum. Cast iron engines last a longtime.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Anyone every tried to mate something like this to the Onan? [message #227037 is a reply to message #226943] |
Fri, 25 October 2013 18:48 |
Jim Miller
Messages: 501
Registered: March 2008
Karma: 10
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Senior Member |
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On Oct 24, 2013, at 10:33 PM, Robin Hood wrote:
> So how is that Onan field rewinder project coming along? Is it really going to be a few hundred dollar price point? That would be awesome and a huge
> help to keeping these things running.
I have repaired another field assembly using coils made on a new coil form with slightly different geometry than the first design. We have also switched to a different encapsulating varnish that we like better than glyptal for this application. The last eight pictures on page 2 of the photo album are the most recent updates:
http://www.jcmco.com/gallery/onanfieldassyrepair
At this point we are thinking about distribution logistics and figuring up our costs and labor time. The finished assembly and a specially made crate for it is quite heavy - it weighs around 75 lbs. This presents some logistical problems freight-wise and we also have a way to ensure our crate and the buyer's damaged core assembly get returned to us somehow.
--Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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1977 Eleganza II
1977 Royale
Hamilton, OH
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| Re: [GMCnet] Anyone every tried to mate something like this to the Onan? [message #227061 is a reply to message #227037] |
Fri, 25 October 2013 21:16 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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| Jim Miller wrote on Fri, 25 October 2013 18:48 |
On Oct 24, 2013, at 10:33 PM, Robin Hood wrote:
> So how is that Onan field rewinder project coming along? Is it really going to be a few hundred dollar price point? That would be awesome and a huge
> help to keeping these things running.
I have repaired another field assembly using coils made on a new coil form with slightly different geometry than the first design. We have also switched to a different encapsulating varnish that we like better than glyptal for this application. The last eight pictures on page 2 of the photo album are the most recent updates:
http://www.jcmco.com/gallery/onanfieldassyrepair
At this point we are thinking about distribution logistics and figuring up our costs and labor time. The finished assembly and a specially made crate for it is quite heavy - it weighs around 75 lbs. This presents some logistical problems freight-wise and we also have a way to ensure our crate and the buyer's damaged core assembly get returned to us somehow.
--Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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Here is the problem with people returning cores.
Some will not do it for many reasons. Too lazy, do not care, too expensive, and you can probably think of several other reasons.
I suggest that you require the core to be returned FIRST or just say we will rebuild yours when we receive it. The Onan not running is NOT something that will put them beside the road. So they can remove the whole Onan or just the part and return it to FIRST. Now you are only out the cost of the crate if they fail to return it.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Anyone every tried to mate something like this to theOnan? [message #227091 is a reply to message #227061] |
Sat, 26 October 2013 08:30 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Kn,
I agree with you 100%, however, I think the problem could be addressed by:
1) Including a pre printed UPS / FedEx label.
2) A core charge that will motivate people to return it; say DOUBLE the cost to return it.
3) Publically shame them on the GMCnet if they don't return it!
Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
USA '75 Avion - Double Trouble TZE365V100426
AUS '75 Avion - The Blue Streak TZE365V100428
-----Original Message-----
From: Ken Burton
Here is the problem with people returning cores.
Some will not do it for many reasons. Too lazy, do not care, too expensive, and you can probably think of several other reasons.
I suggest that you require the core to be returned FIRST or just say we will rebuild yours when we receive it. The Onan not running
is NOT something that will put them beside the road. So they can remove the whole Onan or just the part and return it to FIRST.
Now you are only out the cost of the crate if they fail to return it.
--
Ken
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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