TheNutter
25th Dec 2019, 09:04 PM
Hi all,
I thought the I might share this in the hope that it is something that we might all learn from...
Recently I was machining a bronze casting for a 7 1/4 model locomotive chimney cap. This is a large hunk of bronze bored to fit over a 63mm stainless chimney and then with most of the outer surfaces compound curves. I spent a long time machining the curves with HSS tools that I ground to form. Doing the job involved a lot of tool changes but as I have an AXA quick change tool holder this presented no particular problem. I made these changes without stopping the spindle, something I have done on many hundreds of occasions.
On one occasion I released the tool carrier by giving the lever a flick with the palm of my right hand, the locking lever then spun around until it came into contact with the face of the chuck where it was hit by a jaw. This broke the lever off and sent it flying past my left ear. Something that I by no means enjoyed.
Fortunately there was no major damage and I was able to machine and re-thread the handle to fit.
I will however keep this well in mind from now on and either stop the lathe or move the carriage away before changing a tool carrier.
We live and we learn, if we are careful and fortunate.
Regards
Ian
I thought the I might share this in the hope that it is something that we might all learn from...
Recently I was machining a bronze casting for a 7 1/4 model locomotive chimney cap. This is a large hunk of bronze bored to fit over a 63mm stainless chimney and then with most of the outer surfaces compound curves. I spent a long time machining the curves with HSS tools that I ground to form. Doing the job involved a lot of tool changes but as I have an AXA quick change tool holder this presented no particular problem. I made these changes without stopping the spindle, something I have done on many hundreds of occasions.
On one occasion I released the tool carrier by giving the lever a flick with the palm of my right hand, the locking lever then spun around until it came into contact with the face of the chuck where it was hit by a jaw. This broke the lever off and sent it flying past my left ear. Something that I by no means enjoyed.
Fortunately there was no major damage and I was able to machine and re-thread the handle to fit.
I will however keep this well in mind from now on and either stop the lathe or move the carriage away before changing a tool carrier.
We live and we learn, if we are careful and fortunate.
Regards
Ian