Member postings for Barry Tattersall

REF; Micro milling/drilling machine CMD10.

Many thanks for all the constructive advice. I should have known better having been a timed served Marine Engineer apprentice some 60 years ago when, if I remember correctly, vertical mills were fitted with Clare collet chucks. That aside, the problem was caused by an insecure locating grub screw failure that initially caused the chuck to come adrift [ as previously explained] & I have not experienced a previous problem using a Jacobs chuck for milling, that said, I have today ordered a MT2 collet chuck for future use. Lesson learnt! Many thanks for all the prompt replies & advice.

This machine, I would think, is in common usage by many MEW members and my machine is less than a year old, although does get a lot of use especially during the lockdowns so I thought this matter needs to be addressed urgently, preferably by the manufacturers/suppliers.

Whilst roughing out a brass blank using a 10mm end mill the grub screw locating the handle shaft vibrated loose allowing the handle shaft to disengage from the fine adjustment dog clutch, this resulted in the uncontrolled recoil of the quill shaft and the sudden impact against the upper stop. The shock wave from this caused the chuck c/w cutter to disengage from the mandrel taper and propel itself downwards just missing my foot.

Suggested modification; Loctite grub screw in correct position and check on a regular basis.

Footnote!!! I would think that most of us operate on our own and wear the appropriate protective clothing but do we wear work boots/shoes? Fortunately I do and glad I do with a near miss like this. The only casualty this time being the workpiece.