This is a small holder for 1/8th” diameter solid carbide engraving bits. Mainly to be used on the Sieg KX1 CNC, although it can be used on my Micro Mill.

Made out of 3/4″ diameter chrome moly bar it will fit into the ER25 collet chuck, held in by a 12mm collet.

The locating hole was made by using steadily larger drills as I haven’t got a 3mm diameter reamer, I used a 3mm drill. The surface finish was improved by using a small rolled up piece of emery cloth. The result is a smooth sliding fit with virtually no play at all.  Runout is about 3 tenths of a thou! pretty good I think.

A 3/16th” Whitworth grub screw is used to hold the bit firmly in place. A finishing touch was to stamp ‘1/8’ on the diameter.

I have a few engraving projects in the pipeline and will post them up here when I can.