Tips and tricks in machine tool practice
Posted: Tue Apr 16, 2019 4:18 pm
I picked up a small job of turning a CR Dunallastair 440 Chimney .
So Starting with the Flycutting I have set the Vertical slide in the lathe.
Setting the height or the centre line
Making sure its set to a right angle to the cutter the Flycutter is a home made effort if 12mm Bar an a 2.5mm broken drill ground to shape for the cutter.
Fly cutting.
Checking its right with a disc cut to the right diameter as I have not got the smokenbox to test against.
Now with the
base flycut the bar is placed in the lathe and a 3mm hole drilled in base the reamed out with a 1/8th reamer by turning the chuck by hand so that the reamer stays tight.
with a tight fit 1/8th hole a 1/8th inch rod is pushed in and is a very tight fit.
The Rod Is removed while the bar is turned to just over the largest diameter needed.
Now the Basic shape is marked.
The basic Shape is turned and then parted off.
Once parted off I fitted it to a 1/8th inch rod and mounted to the flair jig.
In the Chuck I now use a 5mm Diamond Ball Grinder and offer up the chimney. Turning the chimney round and cutting the flair to shape.
Now cut off and slotted into a 1/8th Collet for the Boley lathe
So Starting with the Flycutting I have set the Vertical slide in the lathe.
Setting the height or the centre line
Making sure its set to a right angle to the cutter the Flycutter is a home made effort if 12mm Bar an a 2.5mm broken drill ground to shape for the cutter.
Fly cutting.
Checking its right with a disc cut to the right diameter as I have not got the smokenbox to test against.
Now with the
base flycut the bar is placed in the lathe and a 3mm hole drilled in base the reamed out with a 1/8th reamer by turning the chuck by hand so that the reamer stays tight.
with a tight fit 1/8th hole a 1/8th inch rod is pushed in and is a very tight fit.
The Rod Is removed while the bar is turned to just over the largest diameter needed.
Now the Basic shape is marked.
The basic Shape is turned and then parted off.
Once parted off I fitted it to a 1/8th inch rod and mounted to the flair jig.
In the Chuck I now use a 5mm Diamond Ball Grinder and offer up the chimney. Turning the chimney round and cutting the flair to shape.
Now cut off and slotted into a 1/8th Collet for the Boley lathe