Advice on cutting precise bevels for boxes

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diy_cg

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Hi all,

I have an upcoming small project to build small speaker boxes where I need to bevel cut the panels at precise 45 degrees with longest sides being about 250mm (depth of the box). I have purchased Evolution R255SMS+ sliding mitre saw inc 40T wood blade (will also need mitre saw for a flooring project later) as well as Makita trimmer router RT0702CX4/2. I am aware that table saw would do these bevel cuts great, however I don't have access to one nor have space for it so this is out of question for me. I am hoping that I can complete these bevels cuts with the above mentioned mitre saw but I am worried about precision.. if so what would be best way to go about it to ensure I get exact cut lengths with precise bevels at 45 degree at each end, use of stop blocks? Any recommendations would be greatly appreciated. I have Trend magnetic angle finder and will use it to calibrate the saw and test on some scraps before cutting the project pieces. I still have not decided whether to use MDF or birch plywood to make these boxes, hence these questions but I may end up building in both materials with trying MDF first as cheaper and easier to work with (and to help improve my skills).
Additionally I would like to cut out dado's in the side, top and bottom panels (on the inside) in order to insert bracing inner frames to make the boxes solid and to screw in the front baffle and rear panel into the frames. I plan to make a simple adjustable dado jig for this as will need to repeat the cuts on multiple panels and use the Makita router for this as well as for cutting out the circles for the speaker drivers. Any recommendations for simple dado jigs (for 18mm dados), cutter bits etc would be great too!
 
The router should do the dadoes with a fence if you have a suitable base. Failing that a bearing guided cutter is an option. Wealden tools are highly regarded by many on here for cutters
 
I am worried about precision..
Note that the panels that form the top, bottom and sides will have to be absolutely perfectly square before mitreing them, if you're half a degree out of square, the mitres and edges of the box won't marry up and you'll have a hell of a time trying to remedy it
 
You could make up a little sled for a table saw. Ultra-fine adjustment can be confirmed making cuts in scraps first. A pair of scraps cut this way will marry up to form 90degrees once the angle is perfect.
This works on my Kity anyway, the blade slopes away from the track on the right hand side. For mitres on longer pieces it would need the bed extension. Maybe some saws have tracks either side of the blade?
I used a piece of kitchen carcase with an oak fence at the back and a waxed runner. Just because that is what I happened to have to hand.
 
Thanks all, however I only have access to the above mentioned tools (sliding mitre saw and trimmer router) and will try to complete the project with these.
 
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