Electromagnets for AJ couplings
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Electromagnets for AJ couplings
I've reached the conclusion that as I get older, switching to some sort of autocoupling is inevitable, so I thought I'd have a go at using Alex Jacksons (anyone recommend anything else??).
Are there any recommendations for electromagnets which can be readily purchased. Everything I've read talks about ex PO relays or winding your own.
regards, Chris
Are there any recommendations for electromagnets which can be readily purchased. Everything I've read talks about ex PO relays or winding your own.
regards, Chris
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Re: Electromagnets for AJ couplings
Hi Chris,
Try MSE http://www.modelsignals.com/couplings_frame.htm they do a PK MAG uncoupling electromagnet.
Try MSE http://www.modelsignals.com/couplings_frame.htm they do a PK MAG uncoupling electromagnet.
Last edited by Pannier Tank on Tue Aug 10, 2010 1:11 pm, edited 1 time in total.
Regards
David
David
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Re: Electromagnets for AJ couplings
Hi Chris,
Having tried the 'wind your own' version on my current layout, I'm finding that performance is a bit hit and miss, as the strength of the magnetic field is clearly not consistent. You may therefore get more consistency out of a purchased item, and I'd be interested in your findings.
However, the other option is to use a permanent magnet that is physically moved up and down under the trackbed by some form of lever mechanism. The idea was suggested by Gerco van Zetten in Snooze 164 p32, and having seen them in operation on his P87 demo at the convention in the Netherlands last year, I can vouch for the fact that they produced a very positive movement of the coupling every time. Less wiring too, although there's more construction time in the mechanism. I may well be trying this myself in an attempt to find faultless operation under exhibition conditions.
Regards,
Geraint
Having tried the 'wind your own' version on my current layout, I'm finding that performance is a bit hit and miss, as the strength of the magnetic field is clearly not consistent. You may therefore get more consistency out of a purchased item, and I'd be interested in your findings.
However, the other option is to use a permanent magnet that is physically moved up and down under the trackbed by some form of lever mechanism. The idea was suggested by Gerco van Zetten in Snooze 164 p32, and having seen them in operation on his P87 demo at the convention in the Netherlands last year, I can vouch for the fact that they produced a very positive movement of the coupling every time. Less wiring too, although there's more construction time in the mechanism. I may well be trying this myself in an attempt to find faultless operation under exhibition conditions.
Regards,
Geraint
Geraint Hughes
Cromford & High Peak in P4
Danish Railways in P87
Cromford & High Peak in P4
Danish Railways in P87
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Re: Electromagnets for AJ couplings
Simple mechanism to move a fixed magnet - a Servo, cost about £2.50 (or less).
Suitable control circuits available on-line, or a board which will control four is available for a fiver from MERG which works with four on/off switches, or a little more if wanting DCC control of the magnets. This latter option opens up the possibility of mapping the magnets to unused function keys so they can be worked easily whilst driving (I've done this).
Suitable control circuits available on-line, or a board which will control four is available for a fiver from MERG which works with four on/off switches, or a little more if wanting DCC control of the magnets. This latter option opens up the possibility of mapping the magnets to unused function keys so they can be worked easily whilst driving (I've done this).
Nigel Cliffe - Blog of various mostly model making topics
Re: Electromagnets for AJ couplings
If you go with the MSE magnets put them in the ballast between sleepers rather than under the board or something as you wont be close enough otherwise.
Suitable transformer is the Maplins VN10L at 1200mA running at 9V.
This combination has been used successfully by me with hinged and flexing variants on mineral wagons so far.
Suitable transformer is the Maplins VN10L at 1200mA running at 9V.
This combination has been used successfully by me with hinged and flexing variants on mineral wagons so far.
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Re: Electromagnets for AJ couplings
Pannier Tank wrote:Hi Chris,
Try MSE http://www.modelsignals.com/couplings_frame.htm tehy do a PK MAG uncoupling electromagnet.
There is also one from Gaugemaster. It's a bit more expensive though.
http://www.gaugemaster.com/item_details ... ster%20EM1
<watch the wrap>
I have a couple of them at home to try out, but no views one way or the other yet.
HTH
Flymo
Beware of Trains - occasional modelling in progress!
www.5522models.co.uk
www.5522models.co.uk
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Re: Electromagnets for AJ couplings
Pannier Tank wrote:Try MSE http://www.modelsignals.com/couplings_frame.htm tehy do a PK MAG uncoupling electromagnet.
I've been experimenting with one of these on my test track with some mixed results. Most of the problems stem from the dropper being too short and the electromagnet won't pull it down - even when set at 12v. But when the dropper is set, at the recommended, 9mm (for wagons) they work well, even on wagons fitted with DC1 brake gear where the operating rod between the two DC handles limits the amount of movement.
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Re: Electromagnets for AJ couplings
I may be in a very small minority, but I just can't get on with Alex Jackson couplings. They are a very elegant design, but they are so susceptible to maladjustment that their reliability suffers significantly as a result.
After fiddling around with various commercial couplings I eventually devised my own design of magnetically operated auto-coupling, which I call the "Burford" coupling (currently awaiting publication in MRJ).
I don't know how to upload any of this material onto this website, so if anyone wants details, please e-mail me (see the Membership List) and I will be happy to forward a comprehensive datasheet, complete with drawings and a selection of photos.
I have found these couplings relatively easy to bend up from wire and 100% reliable, whereas I never achieved that level of reliability with any other couplings.
After fiddling around with various commercial couplings I eventually devised my own design of magnetically operated auto-coupling, which I call the "Burford" coupling (currently awaiting publication in MRJ).
I don't know how to upload any of this material onto this website, so if anyone wants details, please e-mail me (see the Membership List) and I will be happy to forward a comprehensive datasheet, complete with drawings and a selection of photos.
I have found these couplings relatively easy to bend up from wire and 100% reliable, whereas I never achieved that level of reliability with any other couplings.
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Re: Electromagnets for AJ couplings
I don't know how to upload any of this material onto this website,
There is a place here for asking
But all you have to do is just look down below the box you are typing in, click on the "Upload attachment" tab, browse for your file and then click "Add file" , repeat as necessary then submit your message.
Regards
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Re: Electromagnets for AJ couplings
This is just a page of photos, but the system says the file is too large to upload.
I'll try with the .pdf version :
I hope it's there. (I can't see it on the screen.)
I'll try with the .pdf version :
I hope it's there. (I can't see it on the screen.)
You do not have the required permissions to view the files attached to this post.
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Re: Electromagnets for AJ couplings
The photos seem to have uploaded successfully, so here are the instructions for the 'Burford' coupling (288 KB as a .pdf file):
You do not have the required permissions to view the files attached to this post.
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Re: Electromagnets for AJ couplings
Thanks everyone for the advice. next question is where to put the electromagnets assumnig I try AJs. Here's the trackplan of my little layout - West End - all of 1.5m long
The simplest as far as I can see is electromagnets at A and B which allow for runnning round a train at the platform and also for shunting the two sidings. However, would it also be better to consider adding eletromagnets at C, D or E for the individual sidings?
Thanks
Chris
The simplest as far as I can see is electromagnets at A and B which allow for runnning round a train at the platform and also for shunting the two sidings. However, would it also be better to consider adding eletromagnets at C, D or E for the individual sidings?
Thanks
Chris
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Re: Electromagnets for AJ couplings
Whether you need the extra magnets (eg. C) depends on how you plan to shunt wagons along the sidings.
For example, if four wagons are to be dropped in C, pre-split into two groups of two, then the single magnet at B will be enough. Later you can come back and collect two of the wagons (pre-split).
But, if you need to spread the wagons along the siding C, perhaps two at a (hypothetical) loading dock near the buffer, and two others at a coal staithe nearer to the turnout, then you either deliver the wagons in two separate shunting moves, or you need a way to uncouple the last two at the coal staithe having previously left two (split with uncoupler B) at the loading dock.
This complexity is one of the reasons why I started to put the control of couplers inside locos (and in some pieces of stock), not under the track, though the primary reason was difficulty in finding magnet A in your diagram (and watching layouts with "hunt the magnet" moves).
- Nigel
For example, if four wagons are to be dropped in C, pre-split into two groups of two, then the single magnet at B will be enough. Later you can come back and collect two of the wagons (pre-split).
But, if you need to spread the wagons along the siding C, perhaps two at a (hypothetical) loading dock near the buffer, and two others at a coal staithe nearer to the turnout, then you either deliver the wagons in two separate shunting moves, or you need a way to uncouple the last two at the coal staithe having previously left two (split with uncoupler B) at the loading dock.
This complexity is one of the reasons why I started to put the control of couplers inside locos (and in some pieces of stock), not under the track, though the primary reason was difficulty in finding magnet A in your diagram (and watching layouts with "hunt the magnet" moves).
- Nigel
Nigel Cliffe - Blog of various mostly model making topics
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Re: Electromagnets for AJ couplings
This does underline the one disadvantage of advance uncoupling. If you rely on one or two magnets at or near the throat of a yard you will have to keep shunting backwards and forwards to detach wagons and push them back to the place where you want to leave them - something that would never have happened on the prototype.
For this reason, I put magnets at all the places on my layout where I wanted to leave wagons, except where they will be propelled beyond the last magnet in the sidng to be left further down that siding. [This is discussed in more detail in the data-sheet I uploaded a couple of days ago - see above.]
The alternative of the DCC-controlled coupling hook is ingenious, but its one drawback is that it is fittted only to the loco, which means that you can only use it to uncouple between the loco and the vehicle next to it, unless you fit some of these DCC-controlled hooks to some of the other vehicles as well, which might be as expensive and time-consuming as putting some additional electro-magnets under the track.
For this reason, I put magnets at all the places on my layout where I wanted to leave wagons, except where they will be propelled beyond the last magnet in the sidng to be left further down that siding. [This is discussed in more detail in the data-sheet I uploaded a couple of days ago - see above.]
The alternative of the DCC-controlled coupling hook is ingenious, but its one drawback is that it is fittted only to the loco, which means that you can only use it to uncouple between the loco and the vehicle next to it, unless you fit some of these DCC-controlled hooks to some of the other vehicles as well, which might be as expensive and time-consuming as putting some additional electro-magnets under the track.
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Re: Electromagnets for AJ couplings
Thanks Nigel and Martin. Definitely sounds like I should end up with plenty of magnets - I think l will need two on the longest siding, but then may not need one at B.
regards, Chris
regards, Chris
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