Freerails Home 
Home Search search Menu menu Not logged in - Login | Register
Freerails > Model Railroad Forums > Technical > Do Any Magnetic Uncouplers Actually Work ?

Freerails IS ACCEPTING new Members ... To join Freerails ... See how to Register as a Member in the 'Joining Freerails' Forum

Do Any Magnetic Uncouplers Actually Work ?
 Moderated by: oztrainz Page:  First Page Previous Page  1  2  3   
New Topic Reply Printer Friendly
 Rating:  Rating
AuthorPost
 Posted: Mon Nov 17th, 2014 12:29 am
  PMQuoteReply
21st Post
W C Greene
Moderator


Joined: Fri May 4th, 2007
Location: Royse City, Texas USA
Posts: 7871
Status: 
Offline
Oh heck, just use Link n Pins and quit worrying about it..LOL

Woodie



____________________
It doesn't matter if you win or lose, its' how you rig the game.
Back To Top

 Posted: Mon Nov 17th, 2014 02:23 pm
  PMQuoteReply
22nd Post
oztrainz
Super Moderator


Joined: Wed Apr 10th, 2013
Location: Unanderra, Australia
Posts: 872
Status: 
Offline
Salada wrote:
Thanks John.
That is a nice looking loco. Diesel-hydraulics had a poor maintenance/breakdown record on the UK main line.

Regards                  Michael


Hi Michael,
the DH is available as a highly detailed resin/brass kit in On30.
http://www.oaustkits.com.au/catalog/product_info.php?cPath=26&products_id=122
At over 40 scale feet long and about 12' high in 1/48 scale, it is a beast of a diesel loco in On30.
see http://en.wikipedia.org/wiki/Queensland_Railways_DH_class for more information on the DH class.

Getting back to your coupling woes
if you come down from the MMI locos by using the overset Kadee HO couplings (#142/145/149) and come up from the Bachmann stock by using the underset coupler (#141/144/147) This will give you a coupling height somewhere between HO and On3 that will be for YOUR railway. Provided you keep your trains together as a unit you can run on others tracks. Lets see if it will work before you spend any money....

Using the online Kadee manual available at https://www.kadee.com/html/kadee_catalog_small.pdf
Getting technical from page Reference 4.3
Centreline On3 height = 9/16" = 0.563"
Centreline HO height = 25/64" = 0.391"
Difference - 0.172"

For Underset coupler looking at page HO3.6
The underset coupler raises the coupler centreline by 0.0625" to give a coupler c/line of 0.4535" above track for any bachman refitted stock

For the overset coupler -
The overset coupler lowers the coupler centreline by 3/32 or 0.09375 to give a new coupler centreline for any MMI refitted stock of 0.46925

Please check my calcs on all this.

The new MMi centerline is higher than the new Bachmann centreline by 0.01575"

Now given that the height difference on the new coupler centrelines is less than 0.02" they should couple and stay coupled. Your MAY have to bend the pins down by about 1/16" or so to get reliable uncoupling using Kadee magnets.

In short - yes it is now worthwhile looking at what type of coupler shanks will work best for your equipment - either the standard end or whisker end - My preference would be to go with the whisker couplers if they will fit the draftgear box on the rolling stock.

My head hurts now from all that figuring...but at least it looks like there may be a way to run all you On30 stuff and have it all stay hooked together.



____________________
Regards,
John Garaty
Unanderra in oz
Back To Top

 Posted: Mon Nov 17th, 2014 03:18 pm
  PMQuoteReply
23rd Post
Salada
Registered


Joined: Mon Nov 4th, 2013
Location:  
Posts: 1193
Status: 
Offline
John:

Thanks for that information. I assume the MMI K's coupling height is correctly set for On3 so it is useful to know that KD do an underset coupling (I didn't know that).

Rather than rush into building a subsequently unsatisfactory layout I have been temporarily spiking down various radii curves. At 30" radius the K's have noticeable 'flange squeal & unrealistic looking angle between loco & tender. At 36" radius they look & sound much better so I am altering my track design to 36" minimum, maybe a bit more though that will mean losing some track. I also was not aware of the K's problems on humps/dips so also my thanks for that.

Our 'Western' Class DH's had short operating lives & were always rather problematical.


Regards                Michael
 

Back To Top

 Posted: Mon Nov 17th, 2014 03:25 pm
  PMQuoteReply
24th Post
Salada
Registered


Joined: Mon Nov 4th, 2013
Location:  
Posts: 1193
Status: 
Offline
Thank you Mr Greene - I would not have expected any other answer from your goodself.

Reg - I've never seen that magazine on sale over here, I'll look into that;thanks. A future article on altering Bachmann's draw gear would be interesting.

Mr Stumpy - let us know how you get on with your magnets.

Regards                 Michael

Back To Top

 Posted: Mon Nov 17th, 2014 03:32 pm
  PMQuoteReply
25th Post
Salada
Registered


Joined: Mon Nov 4th, 2013
Location:  
Posts: 1193
Status: 
Offline
Thanks John - that is a really impressive feat of mathematical research on my behalf.
How much do I owe you ??!!.   PM me if only cash will do !!

Cheers,   Michael

Back To Top

 Posted: Tue Nov 18th, 2014 04:58 am
  PMQuoteReply
26th Post
Si.
Moderator


Joined: Thu Feb 23rd, 2012
Location: London
Posts: 4702
Status: 
Offline
Hi Michael

Shame it's not a software problem.

You could just hit CTRL-ALT-DELETE...

...and run the DE-BUGGER !!!

Si.



____________________

' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
Back To Top

 Posted: Wed Nov 19th, 2014 12:15 am
  PMQuoteReply
27th Post
Salada
Registered


Joined: Mon Nov 4th, 2013
Location:  
Posts: 1193
Status: 
Offline
Si, do you think CNTRL-ALT-DEL would work if I wired the computer direct to the track ?

Regards            Michael


Back To Top

 Posted: Wed Nov 19th, 2014 07:15 am
  PMQuoteReply
28th Post
Si.
Moderator


Joined: Thu Feb 23rd, 2012
Location: London
Posts: 4702
Status: 
Offline
Hi Michael

I dunno !

I'm not much up on all this computerised DCC stuff 'n' all.

My Dad always maintained clockwork was the 'way to go' !

No wind up !!

Little time to mess about with needless switching & uncoupling...

...when yer got the main-spring-express high-ballin' it at a ton through the yard !

You've gotta be a real monkey, to wire up a 2-way jack plug wrong !

But...

...an XLR 3-way ?

Now THAT opens up a lotta ways to go wrong !

(50% wired up WRONG in my experience !)

Perhaps D&RGW remote control from Mrs. Salada's iPad...

...high-tech, cuttin' edge chick , by the sounds of.

Us old steam-(punk)types; very last century !

WHOOPS ! ... gotta fly ... my Pentium's just blown another vacuum-tube !

:moose:

Si.



____________________

' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
Back To Top

 Posted: Wed Nov 19th, 2014 04:39 pm
  PMQuoteReply
29th Post
Kent K
Registered


Joined: Sun Nov 9th, 2014
Location: Kansas City, Missouri USA
Posts: 55
Status: 
Offline
My experience has been in HO and S scale narrow gauge. Specifically HOn30 and Sn2. The prototype two foot gauge lines in Maine used what is referred to as 3/4 MCB couplers. In HO this makes the Kadee N scale coupler about the correct size. In S scale the HOn3 coupler is the one used by most of the model community. I would suspect that one of the standard Kadee HO scale couplers would be approximately correct for O scale, but haven't verified it.

I know from experience in club layouts while I was attending university that the Kadee couplers on standard gauge HO lines perform well if the follow the mounting standards set by Kadee's various test jigs.

The trick is getting the trip pins at the proper height and the coupler centers to an accurate, repeatable height. When installed correctly in relation to one another, this line of couplers does perform well with hands off coupling and uncoupling.

If you are doing this on your own layout then these heights and interfaces can be whatever you set them to. If you want to interchange cars with another modeler or with a club, then they need to all be set the same.

I know the references for the two foot gauge lines, but would suggest looking to the NMRA standards for other gauges and scales. There are standards out there for this stuff and if they are followed by all of the parties involved, then interchangeability is possible.

Best regards,

Kent K



____________________
Kent K
In a world without walls and fences, who needs Windows and Gates
Back To Top

 Posted: Fri Nov 21st, 2014 12:32 am
  PMQuoteReply
30th Post
Salada
Registered


Joined: Mon Nov 4th, 2013
Location:  
Posts: 1193
Status: 
Offline
Thank you Si & Kent.
Mrs Salada a cutting edge, high tech chick ?.
Not sure about that but she knows how to switch me on !.

Regards    Michael

Back To Top


 Current time is 12:00 pm
Page:  First Page Previous Page  1  2  3   

Freerails > Model Railroad Forums > Technical > Do Any Magnetic Uncouplers Actually Work ?
Top



UltraBB 1.172 Copyright © 2007-2016 Data 1 Systems