Abratool
30th August 2012, 06:25 PM
A little while back BT Bob & myself purchased a Crotch Centre each for our Hercus lathes.
These little gadgets came in from the USA & we figured "they might come in handy one day."
The concept of a crotch centres has been around for a long time, in essence a vee block ground into a Morse Taper that fits into the Lathe Tailstock. A simple accurate centreing device.
Yesterday, rather than set up on a drill press in the conventional way, decided to give the crotch centre a test run on a small job.
Two holes for tapped grub screws needed to be drilled on centre for a "Trammel Extender" .140" dia holes for 8-32 UNC
The photo tells it all, however if I were using the crotch again a small toolmakers clamp to hold the workpiece would be recommended.:B rather than holding with fingers.
regards
Bruce
These little gadgets came in from the USA & we figured "they might come in handy one day."
The concept of a crotch centres has been around for a long time, in essence a vee block ground into a Morse Taper that fits into the Lathe Tailstock. A simple accurate centreing device.
Yesterday, rather than set up on a drill press in the conventional way, decided to give the crotch centre a test run on a small job.
Two holes for tapped grub screws needed to be drilled on centre for a "Trammel Extender" .140" dia holes for 8-32 UNC
The photo tells it all, however if I were using the crotch again a small toolmakers clamp to hold the workpiece would be recommended.:B rather than holding with fingers.
regards
Bruce