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Fast Tracks :: View topic - Slip switches #8
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Slip switches #8
http://fast-tracks.net/forums/viewtopic.php?f=4&t=855		 Page 1 of 1
Author:  Mario Alao Vieir [ Sun May 11, 2008 4:47 am ]
Post subject:  Slip switches #8
Hi, i´m new in this forum and writing from Spain.
Next week i should recieve my orders from Fast Tracks ( realy looking forward !!!!!!! ) but in the meantime i´ve started to read all the users guide documents and watching all the videos and i´ve a question;
- In the slip switch work i need to cut the switch points and use the rail joiners as you discribe or i can go for the Solid point technic as you advise for the simple turnouts? There is any reason to cut them?
Thank you, and congratulations for the web site and for your amazing products.

Best regards,

Mário

P.s.- Sorry about my English!! :oops:
Author:  emccamey [ Wed May 21, 2008 9:07 am ]
Post subject:  Re: Slip switches #8
Mario,

Slip switches are very different. The four points on each side will move together in tandem, and using 'solid' points will create far too much tension. Doing the 'hinged' flexing with rail joiners is far better and less stress. It will also keep the gage more accurate through the point blades.

For the number 8 (and larger), the center point blades are far too short to allow flexing and these will absolutely have to be cut and hinged for movement. The technique is more 'fiddly' than the simpler flexed points of standard turnouts - but not hard to accomplish with a little practice. The results are a smoother and easier to throw set of points that have exact gaging through the critical areas. the really short center points are practically impossible to construct with flexed techniques - unless you are using something like a code 25 rail (which is impractical).
Author:  Mario Alao Vieir [ Thu May 29, 2008 7:11 am ]
Post subject:  Re: Slip switches #8
Hi Mr. McCamey,
Thank you very much for your help and for your answer, i did my first slip swich and now i understand what you mean about the tension caused by the 4 side points. Regarding the center points can i take them out and contruct the slip swich#8 like the slip swich#6 with solid track ?

Best regards,

Mário
Author:  emccamey [ Thu May 29, 2008 9:46 am ]
Post subject:  Re: Slip switches #8
Mario,

NO. Slip switches (and crossings) narrower than a number 7 (less than 8 degrees) even on the prototypes can not guide the wheels through an oblique 'K' frog without derailment potential. With our models, the extra large flangeway worsens the potential for causing wrong way tracking. Even a number 6 double slip is best served with the moving center points in modeling dimensional specifications.

It's certainly a bit more 'fiddly' effort to construct and make operational the small moving center points, but it's essential. With the narrow double slips and with crossings, one aspect of construction is to make the track gage at the dead minimum. You can also get by with flangeways being smaller than the maximum, but not overly small. One still has to be concerned with mid-ordinate axle offsets that occurs with multi-axle long wheel bases. Each scale, track gage, wheel profiles, and the equipment chassis in use can be optimized for reliable operations, but to cover all the bases of 'standard' components, using a tight track gage, and having the moving point rails will be the most conservative approach.
Author:  Mario Alao Vieir [ Sun Jun 01, 2008 5:58 am ]
Post subject:  Re: Slip switches #8
Hi Mr. Mccamey,

Once again thank you for your help, now i'm clarified about all this tricky issues.

Best regards,

Mário
Author:  rdressel [ Sun Jun 01, 2008 4:22 pm ]
Post subject:  Re: Slip switches #8
Great answer Ed,
Thats something I do when I'm building Dble slips, just a hair tighter in the flangeways
does it. :mrgreen:
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