A sprung loaded collet chuck

[JaguarB]

Hello All

I have been reading this group for some months now and have triggered an email asking me to contribute well looking a the vast range and depth of the postings I do not feel as though I have the competence to offer much as I am an amateur model engineer. May be the solving of this small problem may be of interest to some of you.

I wanted to engrave glass that has an uneven surface but at the same depth over the length of the text. After a few failures I came up with this solution (while possibly reinventing a well known answer) A sprung loaded collet chuck to take the collets and tools from my dremel

The thread on the front of the dremel is 9/32 x 40 a standard M.E thread I was able to buy a die from RDG tools. The next experimentation was the force of the spring I am now using one extracted from a plastic ball point pen. The tool bit is a diamond impregnated ball 1.5 mm Dia in a 3mm shaft.

My contribution to safety was to put a copper shield around the drive pin as the tool rotates at 5000 rpm if it were to come out you can bet that of the 360 deg range it would have to chose from it would aim straight for your eye.

If this helps anyone please feel free to use or mod my drawing.

I would be intrested to know if anyone thinks its any good

Paul

[rpmcneal1]

This same item is available for engraving machines from Antares and others. it is called an EZ-rider burnishing attachment.