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Site
Map |
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PROJECTS |
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This is where I hope to post details
of current projects that won’t fit into other pages on this site. This could include things like
Electronics for model railways, DCC projects etc. as well as other constructional ideas and experiments. |
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Point operating mechanism for Pen-Y-Bont |
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My preference for the use of H&M point motor solenoids presented a problem with the
operation of Peco turnouts. The H&M motors will not operate these points
directly so, I had to devise a mechanisim to “interface” the two
manufacture’s items. The linkage system shown in the picture here is what
I came up with. |
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This is the home made device that is fixed below
baseboard level directly under the point tie bar. It consists of a brass
“slide” in a plasticard housing. A steel or brass pin joins the slide to the
tie bar above. Lateral movement of the brass slide is therefore transmitted
directly to the point tie bar. The slide is motivated by the point motor via a
“Wire in tube” arrangement. (See above Picture) I used 0.7mm dia brass wire
in a 1mm bore tube. |
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At the point motor end the wire in tube is attached
to the H&M solenoid motor via a Zig Zag loop. This is used to take up any
“overthrow” from the Point motor. The throw of the point motor being slightly greater
than needed by the point tie bar. Not shown here is a small micro switch that will be
operated by the point motor bell crank. This will be used to switch the frog
polarity. |
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01/01/07 |
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The H&M point motors are operated by my own
design of CDU which unlike conventional units, do not require the use of
passing contact, push buttons or stud contacts. This module uses 8 easily available components and
will easily handle two H&M units working in tandem. Such as a pair used
on a cross over for example. The device is operated by a single pole double throw
switch with NO centre off position. By using a double pole switch frog
switching can be incorporated. The circuit diagram, details and a suitable power
supply unit diagram can be down loaded from
here and clicking on to
Normal switch type CDU. Design © F.Collins 2006 |