fitting pm4 to peco double slip

[lambretta]

how do you mark up fitting pm4 to peco double slip

slip is wider than the point motor

i normally use a template to make out the slot and screw holes but cant use it on the double slip

 

[Ray H]

The width of the slip doesn't matter. The only slot you need is under the part of the tiebar that the point motor rod will be traversing.

[lambretta]

but i cnt mark up all the holes due to the width of the slip

[Ray H]

Sorry, I don't understand your problem.

 

I presume that you are mounting the PM4 on the underside of the baseboard surface and under the slip's tiebar. The PM4 (and all SEEP type motors) can only move the blades of a point so far to the left and/or right. It doesn't matter whether they are trying to move a point for N, OO or O gauge; there is a maximum travel for the armature and hence the pin through to armature as well as a maximum travel for the tiebar, the latter effectively dictated by the track gauge.

 

The convention (as far as I am aware) is to secure the more by screws through the holes - provided in the motor's circuit board - into the underside of the baseboard top upon which the slip is lying / will be lying.

 

The armature pin locates in a hole in the tiebar either through a (drilled) hole of about 8mm diameter in the baseboard surface immediately under the said tiebar or a slot (also in the baseboard surface) which is in line with the tiebar and (again) under the hole in the tiebar into which the motor's armature pin locates.

 

I sorry if I appear to be missing the point - excuse the pun - but if you've fitted motors to points, the slip shouldn't be any different.

[lambretta]

i use a template to mark the holes to fix the motor and the slot 

drawing pin goes through the hole in the bar (which is normally in the middle of the bar)

point is put to mid point and the the holes are marked up and drilled 

 

double slip has its holes on the outside of the bar instead of the centre so a pin in there lets me mark up the 1 hole but the other is under the slip 

think i may chicken out and use surface mounted motors 

[Ray H]

i use a template to mark the holes to fix the motor and the slot 

drawing pin goes through the hole in the bar (which is normally in the middle of the bar)

point is put to mid point and the the holes are marked up and drilled 

 

double slip has its holes on the outside of the bar instead of the centre so a pin in there lets me mark up the 1 hole but the other is under the slip 

think i may chicken out and use surface mounted motors 

 

But if you can mark drill one hole to fix the motor then don't just need to fit the motor in place using the one drilled hole and once you're satisfied that the more is functioning correctly you can add the second screw by drilling through the motor's vacant hole.

 

Are you using screws that protrude through the top of the baseboard? Is that your problem?

[lambretta]

screw dont go through baseboard

didnt want to do trial and error 

was hoping someone had a foolproof way of doing it plenty of people must use double slips so wondered how they did it 

[Harlequin]

 The Peco slips have the normal mounting slots for their solenoids, but they are offset to one side of the slip. The slots are shown on the downloadable Peco template:

 

So you should be able to use the template to position the hole in exactly the same way as for a simple point template.

 

You can see two "drive holes" in the tie bar, one of which is centred between the four slots as normal, so you can perform your centre pin procedure, if you want.

Edited May 21, 2018 by Harlequin