Subscriber & Member Login

Login, or register today to interact in our online community, comment on articles, receive our newsletter, manage your account online and more!

Another BLI SW1200 question

747 views
11 replies
1 rating 2 rating 3 rating 4 rating 5 rating
  • Member since
    July, 2006
  • From: Phoenix, AZ
  • 1,008 posts
Another BLI SW1200 question
Posted by bearman on Monday, August 07, 2017 10:21 AM

Does anyone know the coupler screw size for this SW1200.  I have to shim the coupler to keep it from sagging and the screws that came with it are too short.  I figure I need 1/8' long screw.  The existing one seems to be 3/32"  #2-56 will not work, the diameter is too big.  And, then, again, it may be a metric size.

Bear "It's all about having fun."

  • Member since
    January, 2010
  • From: Chi-Town
  • 6,811 posts
Posted by zstripe on Thursday, August 10, 2017 9:37 AM

Bearman,

They have to be a Metric size in between 1-72 and 2-56.....sorry I can't measure it for You...batt's dead in my Caliper. I have two of those engines when they first came out and one of them had a drooping coupler. I replaced the couplers with Kadee #5's and used the bronze plate centering spring for all of them. the one that was drooping was because the cover plate had a tiny nub on one side and it would not seat on the coupler pocket, leaving a tiny gap where it meets the coupler pocket side. The cover plate is a very tight fit on the coupler pocket and hard to get in. Maybe look at Yours closely, You may have the same problem. I used a magnifyer light to see Mine. As far as using a shim....I don't know how You could have even got one in there.....the cover plate would have to stick out to do so......mine are that tight a fit...

Good Luck! Big Smile

Frank

 

  • Member since
    July, 2006
  • From: Phoenix, AZ
  • 1,008 posts
Posted by bearman on Thursday, August 10, 2017 12:03 PM

The locomotive came factory equipped with KD #148's.  What I am going to try to do, is eliminate the springs from a couple of bronze centering springs and use them as shims.  I'll see if that works.  I finally heard from BLI, and the screw diameter is supposedly 0.073 and the thread length is 4 mm.  The thread length seems a little long.

Bear "It's all about having fun."

Moderator
  • Member since
    June, 2003
  • From: Northeast OH
  • 13,702 posts
Posted by tstage on Thursday, August 10, 2017 2:02 PM

bearman
I finally heard from BLI, and the screw diameter is supposedly 0.073

Bear

Major diameter (OD of thread) or minor diameter (ID of thread)?  2-56 has a major diameter of 0.086"; 1-72 a major diameter of 0.073".  That's probably the size that BLI is referring to.

Tom

http://www.newyorkcentralmodeling.com

Time...It marches on...without ever turning around to see if anyone is even keeping in step.

  • Member since
    July, 2006
  • From: Phoenix, AZ
  • 1,008 posts
Posted by bearman on Thursday, August 10, 2017 2:35 PM

BLI did not distinguish, but the 2-56 diameter was too big.

Bear "It's all about having fun."

  • Member since
    July, 2006
  • From: Phoenix, AZ
  • 1,008 posts
Posted by bearman on Friday, August 11, 2017 6:53 AM

The shim worked, and even though I have some 1-72 screws on order, I didnt need to use them.  I think the coupler box was just a little too big.

Bear "It's all about having fun."

  • Member since
    January, 2010
  • From: Chi-Town
  • 6,811 posts
Posted by zstripe on Friday, August 11, 2017 7:36 AM

Bearman,

I never really measured them, but I have a feeling that the 148 coupler shank is a little slimer especially where the wiskers and hole are compared to a #5 Kadee coupler. I say this because on My two engines there is no room to put any kind of shim in the coupler pocket, except of course the bronze plate centering spring. The only way for mine to droop, would be if the coupler cover was not seated correctly and that was My problem in the beginning.

Those coupler covers are a very tight fit where they go in between the pilot footboards.....that is where I had to file them down a bit (the edges) so they would fit all the way down on the coupler pocket. If they are not all the way down, You can still tighten the cover down, but they will droop, because of the angle of the cover.

Glad You got it solved.

Take Care! Big Smile

Frank

  • Member since
    July, 2006
  • From: Phoenix, AZ
  • 1,008 posts
Posted by bearman on Friday, August 11, 2017 1:06 PM

I am chalking the coupler box up to quality control, or lack thereof, in China.

Bear "It's all about having fun."

  • Member since
    February, 2002
  • From: Reading, PA
  • 23,093 posts
Posted by rrinker on Friday, August 11, 2017 4:27 PM

 Hmm, I'd almost think they have to be THICKER, Frank. Since there's no more bronze sheet filling up the coupler box. Otherwise there would be a ton of vertical play in there, and I haven't noticed that with all my new builds whish all use #148s, I haven't purchased any #5s in ages.  Now I need to fig out my caliper and my box of couplers and measure them.

                                     --Randy

 


Modeling the Reading Railroad in the 1950's

 

Visit my web site at www.readingeastpenn.com for construction updates, DCC Info, and more.

  • Member since
    January, 2010
  • From: Chi-Town
  • 6,811 posts
Posted by zstripe on Friday, August 11, 2017 6:48 PM

Randy,

That would be My guess also...but without measuring..won't know for sure. I'm still going to....as soon as I can find a darn button batt. for My calipers.....no one seems to have it for some strange reason.....My micrometer also disappeared a few months ago.........Last known user was one of My Son's....but You know how that goes.....LOL I really shouldn't laugh..it was not cheap.

Take Care! Big Smile

Frank

  • Member since
    July, 2006
  • From: Phoenix, AZ
  • 1,008 posts
Posted by bearman on Friday, August 11, 2017 6:56 PM

Randy, there was definitely a lot of vertical play in the coupler box on my SW1200.

Bear "It's all about having fun."

  • Member since
    December, 2015
  • 2,239 posts
Posted by BigDaddy on Friday, August 11, 2017 7:57 PM

zstripe
I have a feeling that the 148 coupler shank is a little slimer especially where the whiskers and hole are compared to a #5 Kadee coupler.

Measured the thickness of four of each: #5's at 0.055" and #158 at 0.049" at the center of the hole.

Henry

COB Potomac & Northern

By the Chesapeake Bay

Subscriber & Member Login

Login, or register today to interact in our online community, comment on articles, receive our newsletter, manage your account online and more!
Popular on ModelRailroader.com
Model Railroader Newsletter See all
Sign up for our FREE e-newsletter and get model railroad news in your inbox!
ADVERTISEMENT
ADVERTISEMENT

Search the Community

Users Online

There are no community member online
ADVERTISEMENT
Find us on Facebook