Author Topic: Kato SD40-2 Coupler Observation  (Read 840 times)

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6axlepwr

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Kato SD40-2 Coupler Observation
« on: January 07, 2014, 08:14:07 PM »
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Tonight I was designing a coupler pocket to fill the gaping hole in the pilot face. Something to represent a real coupler pocket. While making some measurements, I come to find that the distance from the pilot face to the coupler pulling face is almost prototype distance. I was fairly impressed.  It is just a tad longer, but very close. The ture prototype distance is 25". In N-scale that is 0.156" and I measred about 0.162" on the Kato coupler.
Brian

peteski

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Re: Kato SD40-2 Coupler Observation
« Reply #1 on: January 07, 2014, 09:20:08 PM »
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Tonight I was designing a coupler pocket to fill the gaping hole in the pilot face. Something to represent a real coupler pocket. While making some measurements, I come to find that the distance from the pilot face to the coupler pulling face is almost prototype distance. I was fairly impressed.  It is just a tad longer, but very close. The ture prototype distance is 25". In N-scale that is 0.156" and I measred about 0.162" on the Kato coupler.

Nice to know! Now if Kato couplers worked even half as well as MTs - I would be quite happy.  Operationally - they suck!
--- Peteski de Snarkski
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6axlepwr

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Re: Kato SD40-2 Coupler Observation
« Reply #2 on: January 07, 2014, 09:28:03 PM »
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I have not operated with them.

Not being sarcastic at all. I am serious. Please tell me what it is that is so bad. What is it about them that causes them to suck?

Are MT couplers the only other option for the Kato SD40-2? I do not like the spring action in them, but what about making a bushing that makes the MT coupler a solid swing without the spring?
« Last Edit: January 07, 2014, 09:31:02 PM by 6axlepwr »
Brian

Leggy

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Re: Kato SD40-2 Coupler Observation
« Reply #3 on: January 07, 2014, 09:31:11 PM »
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I use them and find they work perfectly fine, then again ore trains don't do much switching especially on a simple roundy round.....

ednadolski

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Re: Kato SD40-2 Coupler Observation
« Reply #4 on: January 07, 2014, 09:58:43 PM »
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What is it about them that causes them to suck?

For me, the Kato factory couplers would not always stay coupled (even to each other).  Nothing quite like having a consist split up while trying to pull a long train upgrade...


Quote
Are MT couplers the only other option for the Kato SD40-2?

I have the Lee English/Full Throttle Z couplers installed in the Kato SD40-2, with a custom-etch brass pocket: https://www.therailwire.net/forum/index.php?topic=21980.msg336974#msg336974

They install with a 00-90 screw in the same hole that the Kato coupler pivots on.   No more spontaneous uncouplings, and no MT slinky.   The etched pocket is closer to scale, which does leave a gap, but that can easily be filled with styrene.


Ed

jagged ben

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Re: Kato SD40-2 Coupler Observation
« Reply #5 on: January 07, 2014, 10:08:02 PM »
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Tonight I was designing a coupler pocket to fill the gaping hole in the pilot face. Something to represent a real coupler pocket. While making some measurements, I come to find that the distance from the pilot face to the coupler pulling face is almost prototype distance. I was fairly impressed.  It is just a tad longer, but very close. The ture prototype distance is 25". In N-scale that is 0.156" and I measred about 0.162" on the Kato coupler.

Hmmm...The Kato SD40-2s certainly have come with some different couplers over the years.  I'd be curious which version you have.

jagged ben

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Re: Kato SD40-2 Coupler Observation
« Reply #6 on: January 07, 2014, 10:08:43 PM »
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For me, the Kato factory couplers would not always stay coupled (even to each other).  Nothing quite like having a consist split up while trying to pull a long train upgrade...

Happens to me as well.  Wish I couldn't say the same thing for MTs though...

6axlepwr

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Re: Kato SD40-2 Coupler Observation
« Reply #7 on: January 07, 2014, 10:09:47 PM »
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This is interesting Ed because you sent me some LE couplers. When I get my coupler pockets in, I will see how well the LE couplers work in it. If I only have to shim above the coupler, that would be cool. If I have to redesign the coupler pocket to accept the LE couplers better, that is just fine also. Might bring the box closer to scale as well. I like the sounds of this developement.
Brian

6axlepwr

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Re: Kato SD40-2 Coupler Observation
« Reply #8 on: January 07, 2014, 10:11:12 PM »
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Hmmm...The Kato SD40-2s certainly have come with some different couplers over the years.  I'd be curious which version you have.

I have Katos latest reun of SD40-2's. The one with the underframe detailing.
Brian

peteski

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Re: Kato SD40-2 Coupler Observation
« Reply #9 on: January 07, 2014, 10:18:33 PM »
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Brian,
as others have mentioned, the biggest problem is that they have unscheduled uncoupling. Especially betwween passenger cars.  While they are closest to the prototype appearance (overall shape, from the plan view), I'm pretty sure that the problem is due to the tip of the knuckle (the part that is curled inward) is too shallow.  When there are lateral forces on the couplers while there is a slack between them, they actually come apart rather easily.  That never happens with MT couplers.  Kato couplers are also pretty much useless for automatic (magnetic) uncoupling. Some of us do use that feature.  :)
--- Peteski de Snarkski
--- Honorary Resident Curmudgeon

peteski

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Re: Kato SD40-2 Coupler Observation
« Reply #10 on: January 07, 2014, 10:25:40 PM »
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Are MT couplers the only other option for the Kato SD40-2? I do not like the spring action in them, but what about making a bushing that makes the MT coupler a solid swing without the spring?

That spring both centers the coupler and allows it to open. Without the spring the coupler will not open for properly uncoupling center itself in the pocket.
--- Peteski de Snarkski
--- Honorary Resident Curmudgeon