I presume those stopped housings are straight jarhead.
If so then you need a straight edge clamped to the piece offset by the distance to the router base for the size cutter you are using.
The stopped housings can have a piece of wood as a stop on both ends if it is an important dimension. If not then just mark the ends and watch where you you are cutting until you reach the line. This is easier if you have a vac attached to the router to take the swarf away.
If they really are eliptical as in the drawing then you would need to make a template which takes note of the bush you would use on the router.
I use 1/4" MDF for all my templates and jigs as it is easy to work with and can be easily filed to a good finish for the bush to follow.
Of course. You could make a template for the straight trenches (slots, housings or dados depending where you are)
Making such a template ensures that every piece is the same if you intend making more than one.
It's also great practice for using a router to straight edges offset to the baseplate and cutter diameter you decide to use.
A bit of arithmetic comes into play when you use a standard 30mm bush as we have here and use an imperial size cutter.
This helps when I want a good finish as I make the template for a 1/2" (12.7mm) cutter then use a 12mm one to start then the 1/2" to finish to size.
If so then you need a straight edge clamped to the piece offset by the distance to the router base for the size cutter you are using.
The stopped housings can have a piece of wood as a stop on both ends if it is an important dimension. If not then just mark the ends and watch where you you are cutting until you reach the line. This is easier if you have a vac attached to the router to take the swarf away.
If they really are eliptical as in the drawing then you would need to make a template which takes note of the bush you would use on the router.
I use 1/4" MDF for all my templates and jigs as it is easy to work with and can be easily filed to a good finish for the bush to follow.
Of course. You could make a template for the straight trenches (slots, housings or dados depending where you are)
Making such a template ensures that every piece is the same if you intend making more than one.
It's also great practice for using a router to straight edges offset to the baseplate and cutter diameter you decide to use.
A bit of arithmetic comes into play when you use a standard 30mm bush as we have here and use an imperial size cutter.
This helps when I want a good finish as I make the template for a 1/2" (12.7mm) cutter then use a 12mm one to start then the 1/2" to finish to size.