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Best way to power PF F7 locomotives

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Re: Best way to power PF F7 locomotives

Post  Shuppiluliumas on Sun Jan 23, 2011 12:26 am


It's good to hear there are more Lego train builders around here. If there are any pictures of these locomotives online, that might be helpful. Without knowing anything else, though, I imagine a second motor would help a lot. Just turn one around relative to the other so they're spinning the same way.

If you don't want to do that, it's possible there is a problem with weight distribution or some issue with parts binding on each other behind this. If the engines you built were 6-wide and a similar scale to the Lego Super Chief set, I would think one motor would be more than enough. I think we'd need to see it to figure out anything else, though.

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Re: Best way to power PF F7 locomotives

Post  PennLUG on Sun Jan 23, 2011 4:32 pm

It's just a matter of wiring to get them running in same direction just flip the way you have the wire connected to the power source. This is assing you have both motor going to the same IR sensor. If your using two different sensors then you need to flip the directional switch on the controller you are using.


And as Tony said its a traction issue. There is plenty of power in the new motor you just have to make it stick to the track. Easiest solution is more weight. Better rubber on the wheels will help as well.
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Re: Best way to power PF F7 locomotives

Post  Shuppiluliumas on Sun Jan 23, 2011 9:10 pm

Well, looking at that, there are a couple things you might try. There's no reason a new PF motor couldn't pull that and a few cars. Adding weight might help if there's room to do it. Also, you might try some thicker rubber on the wheels. We usually use plumbing o-rings. Get the thinner ones: they'll still be quite a bit thicker than the stock Lego rubber. Here's a Railbricks post about it from Tony Sava where he suggests the #35 o-rings:

http://www.railbricks.com/railblog-categories/power-functions/93-a-power-functions-primer

Also, make sure the wheels on your non-powered truck are spinning freely, and that the trucks can swivel freely around turns.

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Re: Best way to power PF F7 locomotives

Post  Cale on Tue Jan 25, 2011 12:59 am

It's good to hear you've got your engine running better. The issue Tony mentioned with the older gray wheel sets is that due to improper molding the walls of the wheel holder surrounding the flanges of the wheels is too thick. This causes the holder to contact the wheel and cause excessive friction. Here is an illustration of what I'm talking about.

http://www.brickshelf.com/cgi-bin/gallery.cgi?i=264039

This was predominately a problem around the time the Super Chief sets were produced affected the grey wheel sets. I've never heard of much problem with the black wheel sets around this time. If you have the gray wheel sets and they are rubbing and you don't mind modifying your wheels they can be fixed. You'll need to take an exact o knife and carefully shave the inner part of the wheel set that rubs the flange.

My Super Chief set has this problem but I've never bothered to fix mine.

Hope that helps.

Cale
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Re: Best way to power PF F7 locomotives

Post  Cale on Wed Jan 26, 2011 3:44 pm

Vader22135 wrote:Here is a great link for you cale
I hope you enjoy it
http://www.youtube.com/watch?v=Yg6-fSkoFNQ&feature=related

That's obviously not a LEGO Santa Fe engine. It must be mega butt-crack the way it falls apart. A true LEGO train stays together better when it falls. I know this.

http://www.brickshelf.com/cgi-bin/gallery.cgi?i=1882575

Cale
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Re: Best way to power PF F7 locomotives

Post  vyronwynter on Thu Jan 27, 2011 3:18 pm

Cale wrote:

That's obviously not a LEGO Santa Fe engine. It must be mega butt-crack the way it falls apart. A true LEGO train stays together better when it falls. I know this.

My response to you is the same as the one to those who say a cat always lands on its feet.


You are not thowing it right.


Tony Sties
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Re: Best way to power PF F7 locomotives

Post  Cale on Thu Jan 27, 2011 3:34 pm

vyronwynter wrote:
Cale wrote:

That's obviously not a LEGO Santa Fe engine. It must be clone brick the way it falls apart. A true LEGO train stays together better when it falls. I know this.

My response to you is the same as the one to those who say a cat always lands on its feet.


You are not thowing it right.


Tony Sties

Ha ha ha. The funniest part is that BNSF engine that I crashed belonged to some one else. Mine was the one still on the table. And of corse as soon as it hit the floor some one was there to get photographic evidence of the incident.

Cale
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