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Discussion Starter · #1 ·
Hi all,
The point to the turntable is to near the board frame to mount a seep motor in the normal way so i need to invert it and add a link to the point tie bar using a short length of piano wire but has anyone seen a collett to take both the point rod coming down and the piano wire at a right angle, to suit the point rod size a good fit.

Somthing like the meccano three hole connector though of course they are to big in dimensions.
 

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Are you thinking of something like the cranks in the Mercontrol system from Gem?

David
 

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[quote name='dwb' date='24 Oct 2008, 22:31' post='65097']
Are you thinking of something like the cranks in the Mercontrol system from Gem?

Hi David,

I hope it conveys better in my diagram here the link to the point motor to go through the centre of the collet fixed with a screw possibly as in this item from meccano
Rectangle Musical instrument Musical instrument accessory Wood Art

My diagram shows this on the left though ont in scale i hope you see my meaning now.
Rectangle Slope Parallel Font Pattern
 

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OK. I'm not sure I understand what you're doing. Is the solid black line with the right angle in it a solid piece of wire and you are using it to turn the movement through 90 degrees? If so, it's not how I would be inclined to do it as I would be worried that the wire would flex and there would be no movement at the point. I have never tried anything like this, it's just what I think might happen.

If you are trying to turn the motion through 90 degrees, I think you would be better to use an angle crank. That way all the force in the wires is along the longitudinal axes and thus not as liable to flexing with the result that you lose less motion from the motor.

Am I close?

David
 

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Have you considered using a Peco point motor instead? Because of the different mounting arrangement these take up less room when fitted directly to the bottom of the point, so can be attached even if the track is nearly at the front of the baseboard with the framing underneath one side of it. If this is impossible there is always the above-baseboard adapter.
 

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Discussion Starter · #6 ·
QUOTE (dwb @ 25 Oct 2008, 08:11) <{POST_SNAPBACK}>OK. I'm not sure I understand what you're doing. Is the solid black line with the right angle in it a solid piece of wire and you are using it to turn the movement through 90 degrees? If so, it's not how I would be inclined to do it as I would be worried that the wire would flex and there would be no movement at the point. I have never tried anything like this, it's just what I think might happen.

If you are trying to turn the motion through 90 degrees, I think you would be better to use an angle crank. That way all the force in the wires is along the longitudinal axes and thus not as liable to flexing with the result that you lose less motion from the motor.

Am I close?

David

Hi David,

I see your thinking now ....... realised i had drawn the motor wrongly here is a revised and more to scale diagram, the piano wire in short lengths shouldnt flex as i intend to put the motor as near as is practical, the meccano type fitting is ideal but too big do you see now how i would incorporate it in ?

*** Edwin ***

I thought of a peco motor but there just isnt the space ..... thank you for the suggestion though.
 

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Provided that the wire is stiff enough, you should be ok.

I would be tempted to try a single "bank" from a small electrical connector. Strip off the outer insulation to reduce the size.

There's a picture of what I am referring to here on the Farnell website. A single one of these should work as a connector.

David
 

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Could you not make something out of a bit of square section tube and a few holes and screws perhaps? Particularly given it is a one off?
 

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Good idea DWB took your advice with the chocolate block inner as can be seen, the frame got nipped with the drill being so near the edge.





 

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and it works? Result


David
 

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Discussion Starter · #11 ·
QUOTE (dwb @ 25 Oct 2008, 22:55) <{POST_SNAPBACK}>and it works? Result


David

Yes i've tested it works fine
 

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QUOTE Yes i've tested it works fine :biggrin:

That's made my day; I'm delighted.

David
 

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Discussion Starter · #13 ·
I'm glad DWB it made your day
did mine as well
 

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See what you mean about it being too close to the edge to use a Peco motor. I've got some more to do at some stage where this could well be an excellent solution.
 

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QUOTE (Edwin @ 26 Oct 2008, 09:14) <{POST_SNAPBACK}>See what you mean about it being too close to the edge to use a Peco motor. I've got some more to do at some stage where this could well be an excellent solution.

It is a good solution Edwin, i omitted to say the piano wire is 18 gauge and the first photo in my post the wire had yet to be trimmed to length up to the point motor.
A modification may work even better shown below in the picture a second chocolate block insert and a thicker linkage from the motor would eliminate any flex that develops the wire going to the point more rigid in a shorter length, a drop of thread lock once all is lined up on the screws and your done
 

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QUOTE the piano wire is 18 gauge

I don't suppose you know which note this wire would be used for? I can't relate to gauge measurements at all but I could go into the living room and poke the appropriate note. I wouldn't be allowed to remove it though; death would follow quickly


David
 

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QUOTE (dwb @ 26 Oct 2008, 11:58) <{POST_SNAPBACK}>I don't suppose you know which note this wire would be used for? I can't relate to gauge measurements at all but I could go into the living room and poke the appropriate note. I wouldn't be allowed to remove it though; death would follow quickly


David

Hi David ,

Not sure which note it is never been the musically inclined sort
all i know is it fits in peco n gauge point tie bars perfectly and its marked up in my piano wire stock tube as 18 gauge
 
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