Quote Originally Posted by JAZZCNC View Post
There are many options with BT30 tool holders and you can hold just about any size tool with the correct holder.
For flexabilty you'll probably get ER collet holder and use it with standard ER collets so any size is tool in that ER range. For higher accurecy you'll buy dedicated tool holder sizes.
Great thanks. The gears I make need a 1mm endmill, held with 3mm shaft, hence the question.