Tool diameter accuracy

[routercnc]

Hi Neale,

Doesn't seem like a particularly heavy cut so it's a bit odd that one. I cut a fair bit of 3mm ply, liteply, and the occasional bit of MDF and use a single flute 3mm TCT router bit without problems. Here is my home design Spitfire which all locks together nicely . . .



Can you do a plunge into a semi-hard material (e.g. hardwood) to drill a hole and then check the diameter? This gets around the single flute problem for diameter.

Some of my bits are quite worn, especially the lowest part of the cutter, and they are less than the original diameter. Should throw them really but they are still OK for roughing or non-critical jobs. How old are your cutters?