Dormer Bell Type Centre Drill

[Bluechip]

What's these 'ere things then ???

Look a bit like a strange counter-bore ??

Never heard of them.

Not that I want any, just curious.


http://www.ebay.co.uk/cln/plessey/jow1995/249252531019?_trksid=p2057337.c100492.m4036&_trkparms=aid%253D666004%2526algo%253DCOLLECTIONS.MBE%2526ao%253D2%2526asc%253D38529%2526meid%253Dc40d6cf1e7424b52a96acd06ffcffda7%2526pid%253D100492%2526rk%253D1%2526rkt%253D18%2526

Dave

Link's a bit cranky, scroll down, last piccy. 

[Jasonb]

Rather than the 60deg conical hole they give a rounded hole like a bell or trumpet. Used when offsetting the tailstock to turn tapers as the rounded profile does not damage the tailstock ctr.

[Bluechip]

Ah So ... thanks 

Ages ago I had a live centre, 4MT, with a spherical end, ( from memory, about 4-5mm dia. ) instead of a conical point.

I was told that was for offset taper turning.

IIRC it was Archer Brand.

It got given away, no use to me, 2MT on the ML7/T I had at the time.

Dave