A question of Mdf?

[Millatime16]

Ha, the router bit has no idea nor cares whether you are using a router or a cnc, in fact I'm suprised you thought there was a difference.

Sorry I thought they were different. I just found a straight fluted mill bit that can plunge (specifically for CNC). Will give one of those a try. Thanks for suggestion. :)

[EddyCurrent]

Plunging is fine but there comes a time when you should look at lead-in moves. What CAM software are you using ?

[Millatime16]

Plunging is fine but there comes a time when you should look at lead-in moves. What CAM software are you using ?

I would only be plunging 6mm holes and the start of the table edge. I am using V Carve and Mach 3

[charlieuk]

spiral or ramp it in, I have been getting the real cheap ones from banggood and had good results and about £1-3 each depending on size

[Millatime16]

spiral or ramp it in, I have been getting the real cheap ones from banggood and had good results and about £1-3 each depending on size

Carbide or HSS?

[charlieuk]

carbide

[EddyCurrent]

Plunging can leave marks on the edge, ramping into the cut is a far better method.

Measure the thickness of the MDF, if it's more than nominal then it likely has moisture content and that can make it fluffy.
ONLY if it's dry, a coat of spirit sanding sealer helps to keep it dry and also penetrates and consolidates the surface making for a crisper edge.