bicknell (!empty($user->lang['WROTE'])) ? $user->lang['WROTE'] : ucwords(strtolower(str_replace('_', ' ', 'WROTE'))):
Cutting the slots in the PC Board ties to electrically isolate seems rather, well tedious. I've tried a file and a dremel, and both leave marks that show up after painting. I think I'm going to have to fill them back with some sort of glue to get the look I want. Maybe it's a technique thing; but it seems there must be an easier way. Indeed, I ask myself if they could not be sold pre-notched, that is do a normal PC Board etching process as you would to make a computer board with the small grooves etched away. Then slice them into ties. You're probably thinking too many different styles to make right, well, consider this idea with the next point and I think it might work....
I think I'd actually prefer if all the PC Board tie slots were "full length" so rather than cut them prior to building the turnout they can be cut when done. If the QuickSticks were also routed to accommodate this while gluing triming the ties to the exact length would be a final step, done with nippers and quick stick ties as easy guides. As the video demonstrates in cutting off the throwbar this is far easier than cutting 9-12 different lengths to go in the jig. With some clever offsetting this could make my previous idea work better and reduce the number of etching styles significantly.
We have looked at pre-gapping the turnout ties, however the problem is that gaps are required in different locations on each tie and on each type of turnout, so pre-gapping does not seem to be practical. We can pre-gap crossties as the gaps are always in the same location for every tie.
A triangle file is the best option for gapping. Quick and relatively painless.
As for making all of the PCB ties the same lengths and cutting them after finishing the turnout, that is definitely something we would like to do, but it is an expensive modification. You have to appreciate that the assembly fixtures 'evolved' into what they are today. Tim started CAD work nearly six years ago, and really never expected that the business would grow and evolve into what it is today. The fixture design has evolved over time, but as he added more and more files to the CAD library, it became more and more difficult to go back and make changes. At some point along the way he realized that it would be a great time saver if all of the ties were the same length in the fixture, but by then he already had a large library of completed CAD files and going back to modify all of them would be a monumental undertaking.
We have toyed with the idea of just updating some of the CAD files, but doing so will require changes to our PCB ties as well, and the documentation, and our website descriptions and images, etc., etc. In other words no small undertaking.
So for the time being the design is what it is. Perhaps someday we will be in a position to hire an intern or two who can work under Tim to create a version 2.0 of all the fixtures, but I suspect that is some time off.
bicknell (!empty($user->lang['WROTE'])) ? $user->lang['WROTE'] : ucwords(strtolower(str_replace('_', ' ', 'WROTE'))):
I'm having only ok luck with Pilobond. I believe I'm following directions (other than handing the next day, rather than 48 hours later). I virtually always have at least one small segment of ties just fall off, even though the others seem quite secure. Again, since durability is a concern this is not sitting well with me. It may be I'm not getting the base of the rail clean enough (left over flux and stuff) since at least one I didn't clean as I wasn't intending to use it in a layout.
A couple of points for Pliobond. Be very sure that the adhesive has been given enough time to 'dry' before you assembly the two pieces. There should be no liquid left on the surface.
To help accelerate the cure and improve the bond, apply some heat with your soldering iron along strategic points along the rails. Just slide the tip along the base of the rail and let it dwell on important locations. The adhesive should sizzle a bit, telling you it has been heated up enough to cure.
Pliobond does work, but it does require strict adherence to the instructions for using it. Our turnout video demonstrates the above techniques, and we have just finished shooting new videos that demonstrate how to use Pliobond in much more detail. We hope to have these new videos on our site in early October.
bicknell (!empty($user->lang['WROTE'])) ? $user->lang['WROTE'] : ucwords(strtolower(str_replace('_', ' ', 'WROTE'))):
The jig does act as a major heat sink. Soldering two bits of flex track together with a rail joiner I can put my iron (80W weller solder station) on the outside of the rail and then touch the solder to the inside of the rail less than a second later, and it flows through the joiner (which has flux in it) perfect. Total time on work 1.5 seconds max. With the jig, even if I leave my iron on the side of the rail for 5 seconds I can't touch the solder to the other side and get it to flow. The aluminum just wicks away too much heat. I wonder if the grooves were cut deeper for the rail, but not the ties, if the heat wouldn't wick away so fast. It would remove the bottom of the rail from being in contact, and just leave the sides. It's not a big deal, I use the small dab of solder on the tip, touch the tip to the PC tie method and it works great, but it would be nice to able to get it to flow under nicely all in one shot.
We get this comment often and have always traced the problem back to incorrect soldering techniques. There are three things to keep in mind when soldering in a fixture. First, be sure that the ties are sitting flat on the bottom of the fixture and that the rail is sitting flat on the ties. During soldering you may need to hold the rail down with one finger as you are soldering. Second, be sure you are using the smallest soldering tip possible. We recommend the
ST7 chisel tip here. This ensures that the heat is being concentrated on the area that you are soldering. Using a larger tip will result in the tip coming in contact with the fixture. As soon as that happens, the heat will be re-directed into the fixture, rather than onto the part you are soldering. Three, be sure you are using flux and that the flux is only applied to the areas you want to solder. Very much a case of a little dab will do-ya type of approach.
Using a bigger iron is not a solution. A 35W iron is more than adquate as long as you follow the above advice.
We have also just finished shooting a longer, higher quality video that demonstrates these techniques and clearly shows how well soldering in a fixture can work. If you have not watched the soldering video that we have on our website now, I would encourage you to have a look. You will
find it here. (A copy of this video should be on your CD, or you can download higher quality version of this video from our site as well.)
If you like you can skip ahead to about the 4 minute mark in the video where Tim demonstrates exactly how to solder in a fixture.
I hope that this has been helpful.