different running speeds

virtual-bird Jun 7, 2000

  1. virtual-bird

    virtual-bird TrainBoard Member

    1,037
    0
    33
    How do you make all locos run the same speed?

    I have 2 atlas locos when running on different lines next to each other, same power, one takes off and the other just cruises...

    ideas? Could it be something to do with the motor in the loco? or pickups?

    the slow one looks like it runs at the right speed the other looks like its going for land speed records!
     
  2. Gats

    Gats Staff Member TrainBoard Supporter

    4,122
    7
    59
    Are they the same model? If not, then it's possibly a function of the motors and/or gearing used. A good example was the first release Atlas/Kato U-25B. It was geared low. Very few other models run well with them due to this.
    If they are the same, then it's an indication of a possible underlying problem.

    Gary.

    ------------------
    Gary A. Rose
    The Unofficial TC&W page
    N to the Nth degree!
     
  3. BC Rail King

    BC Rail King E-Mail Bounces

    904
    0
    24
    I ahve had that problem with one of my 3 SD60 locomotives.

    Happy Railroading!

    Dane N.

    ------------------
    TAMR2860-AKA BC Rail King
    TAMR2860@Canada.com for TAMR info.
    To send a general TRAIN! E-Mail send to
    BCRailKing@Canada.com
    AIM me at TAMR2860!
     
  4. Dash

    Dash TrainBoard Member

    78
    0
    19
    BCRail, Sd60's eh??? Interesting. I thought that was unique to Spectrum (and other Bachmanns) LOL!

    ------------------
    Cya own the line!

    The one and ONLY Dash!!
     
  5. BC Rail King

    BC Rail King E-Mail Bounces

    904
    0
    24
    lol-I guess that will be in your review [​IMG]

    Happy Railroading!!

    Dane N.

    ------------------
    TAMR2860-AKA BC Rail King
    TAMR2860@Canada.com for TAMR info.
    To send a general TRAIN! E-Mail send to
    BCRailKing@Canada.com
    AIM me at TAMR2860!
     
  6. BC Rail King

    BC Rail King E-Mail Bounces

    904
    0
    24
    By the way, I am going to use my same aragant answer, Digitrax, lol, aren't ya just sick of that!

    Happy Railroading!

    Dane N.

    ------------------
    TAMR2860-AKA BC Rail King
    TAMR2860@Canada.com for TAMR info.
    To send a general TRAIN! E-Mail send to
    BCRailKing@Canada.com
    AIM me at TAMR2860!
     
  7. mtaylor

    mtaylor Staff Member TrainBoard Supporter

    2,720
    18
    48
    <BLOCKQUOTE>quote:</font><HR>Originally posted by BC Rail King:
    By the way, I am going to use my same aragant answer, Digitrax, lol, aren't ya just sick of that!

    Happy Railroading!

    Dane N.

    <HR></BLOCKQUOTE>

    Nope, I am obsessed by DCC and Digitrax.
     
  8. virtual-bird

    virtual-bird TrainBoard Member

    1,037
    0
    33
    <BLOCKQUOTE>quote:</font><HR>Originally posted by Gats:
    Are they the same model?
    Gary.
    <HR></BLOCKQUOTE>
    Nope.... Different models.. So its gonna be a pain in the bottom then aint it...

    I thought about gearing, but didnt think that should be a problem... they shouldnt be different....
     
  9. Gats

    Gats Staff Member TrainBoard Supporter

    4,122
    7
    59
    <BLOCKQUOTE>quote:</font><HR>Originally posted by virtual-bird:
    Nope.... Different models.. So its gonna be a pain in the bottom then aint it...
    <HR></BLOCKQUOTE>

    That depends... more info dude. Which models are they?

    <BLOCKQUOTE>quote:</font><HR>
    I thought about gearing, but didnt think that should be a problem... they shouldnt be different....
    <HR></BLOCKQUOTE>

    That's true. But if they are different that is a problem. Another is the differences in motor windings. Usually this is not as drastic a difference to different gearing, it can be distracting. But from what you initially reported, it does sound more like gearing, or maybe binding in the mechanism.

    Gary.


    ------------------
    Gary A. Rose
    The Unofficial TC&W page
    N to the Nth degree!
     
  10. Inkaneer

    Inkaneer TrainBoard Member

    3,727
    429
    62
    If you have DCC you will have no problem. If no DCC then put the faster engine last in your lashup so it pulls the train. The resistence will slow it down the slower unit can then assist. Ain't perfect but a lot less expensive than DCC.
     
  11. BC Rail King

    BC Rail King E-Mail Bounces

    904
    0
    24
    The problem with that is the horrable squeel that comes out from the wheels. Sopunds like you have struck down a child and are dragging them down the tracks.

    Happy Railroading!!

    Dane N. [​IMG]

    ------------------
    TAMR2860-AKA BC Rail King
    TAMR2860@Canada.com for TAMR info.
    To send a general TRAIN! E-Mail send to
    BCRailKing@Canada.com
    AIM me at TAMR2860!
     
  12. eddelozier

    eddelozier TrainBoard Member

    246
    0
    20
    I have on my drawing board a future project to add in-line power resistors to control speeds. I mainly want to control speeds on the down grades in a 'hands-off' operation. I was thinking of adding a mercury switch to the same 'resistor' power line. This would activate on upgrade climb(bypassing the resistor) and deactivate on downgrades(power taking the resistor path). May bite off more than I can chew?? It's a kind of dynamic braking action.

    Eddie

    ------------------
    Eddie Delozier
    PRR N-scale
    deloziers.com
    eddelozier@yahoo.com
     
  13. Gats

    Gats Staff Member TrainBoard Supporter

    4,122
    7
    59
    Eddie,

    What you are looking at doing is similar to what a back EMF controller does. The back EMF is created by the motor as the armature moves past the pole, or magnet. It creates an AC voltage that the controller 'reads' and adjusts the DC output accordingly to maintain a steady motor speed at the throttle setting. As the motor slows on an ascent, it raises the DC voltage and vice versa as the motor runs faster on a descent.
    No need for mercury switches and resistors with this.
    Also, I think you would find a mercury switch very fidgety to set up. Mercury is extremely viscose at room temperature and would move around within the switch at the slightest movement of a locomotive.
    BTW, how small can you get a mercury switch these days? The ones I am familiar with would only fit into O Scale or larger.

    Gary.

    ------------------
    Gary A. Rose
    The Unofficial TC&W page
    N to the Nth degree!
     
  14. virtual-bird

    virtual-bird TrainBoard Member

    1,037
    0
    33
    Gary.
    you asked what they were.
    One is a SD7, a GP9, the latest is a RSD4/5..

    the RSD would beat a top fueler.. trust me.
     
  15. Gats

    Gats Staff Member TrainBoard Supporter

    4,122
    7
    59
    <BLOCKQUOTE>quote:</font><HR>Originally posted by virtual-bird:
    Gary.
    you asked what they were.
    One is a SD7, a GP9, the latest is a RSD4/5..

    the RSD would beat a top fueler.. trust me.
    <HR></BLOCKQUOTE>

    Ok, I'd say if the SD7 is an Atlas unit it would be the slow one. They used the same gearing on those as Kato did on the U30-C (which, if anyone has a problem with gears in the U30 use Atlas SD7/9 replacements).
    I'm not sure of the ratio used in the RSD, as it could be different in the two (original vs classic) releases so far. The original would use a similar ratio to the SD7/9. The newer 'Classic' release should have a fictionless truck and, if it does, probably a ratio similar to the SD60.
    I haven't compared any of the GP7/9's against anything else, yet, so can't comment on their compatability. Anyone?

    Confused? [​IMG]

    Gary.

    ------------------
    Gary A. Rose
    The Unofficial TC&W page
    N to the Nth degree!
     
  16. virtual-bird

    virtual-bird TrainBoard Member

    1,037
    0
    33
    <BLOCKQUOTE>quote:</font><HR>Originally posted by Gats:

    Confused? [​IMG]
    <HR></BLOCKQUOTE>

    yes thanks...

    how do i fix the problem?
     
  17. Gats

    Gats Staff Member TrainBoard Supporter

    4,122
    7
    59
    VB - I'll organise a time to look at them for you. We can play around and run through some different ideas to alleviate the problem, and cover some other questions you have voiced.
    I'll be away for near 2 weeks as of tomorrow, so drop an email to me and we'll get together in the near future. Possibly get Paul in on the act as well, if he's interested.

    Gary.

    ------------------
    Gary A. Rose
    The Unofficial TC&W page
    N to the Nth degree!

    [This message has been edited by Gats (edited 10 June 2000).]
     
  18. virtual-bird

    virtual-bird TrainBoard Member

    1,037
    0
    33
    <BLOCKQUOTE>quote:</font><HR>Originally posted by Gats:
    VB - I'll organise a time to look at them for you. We can play around and run through some different ideas to alleviate the problem, and cover some other questions you have voiced.
    I'll be away for near 2 weeks as of tomorrow, so drop an email to me and we'll get together in the near future. Possibly get Paul in on the act as well, if he's interested.

    Gary.
    <HR></BLOCKQUOTE>

    Sold... I will throw on some food if you have a BBQ we can use for your time and effort.
     

Share This Page