I really don't think that adding ER25 will give you any more flexibility than an ER32? You can get ER32 collets that grip as small as 1mm (0.039"), which is the same size as the smallest ER25.
Personally, I would have thought an ER40, which would give you up to 26mm (1.024") capacity. Or, go to ER50 which would give you 32mm (1.339") capacity.
Personally, I would have thought an ER40, which would give you up to 26mm (1.024") capacity. Or, go to ER50 which would give you 32mm (1.339") capacity.
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