Gallery, Projects and General > Project Logs
Oh Blimey I bought a CNC Lathe !!!!
awemawson:
So how did it go . . well ok except that I dropped a b@@@@k :bang:
Cutting the female thread somehow I managed to set the lathe up for 1.75 mm pitch and not the 1.5 mm that it should have been - silly error involving putting a selector lever into position '6' and not '8'.
I remember making a scratch cut to check pitch with a thread gauge, the gate alarm went off announcing a visitor, I went and dealt with them, and came back and cut the thread WITHOUT checking the pitch. I got a funny feeling about it when I'd cut about 1/3rd of the depth, checked, had a hot flush, set the pitch correctly and re-cut the thread. It actually doesn't look too bad, but I'm concerned regarding it's tensile strength - if it strips the chuck will let go of whatever it is gripping and that's not a nice thought.
So I've decided to make another one :bang:
However I continued finishing this one off, made a slight design change reducing the outer diameter from 82 mm to 79 mm which allows it to pass through the chuck converter flange, making assembly easier.
awemawson:
Having reduced the diameter to 79 mm to allow it to pass through the chuck adapter flange has meant that I can get the replacement out of an 80 mm bar, whereas before I had to start with 100 mm - so the next one should make less swarf.
80 mm bar on order :thumbup:
It has at least allowed me to operate the chuck - I've increased the operating pressure to 5 bar so about 1/4 full spec, which has let me experiment with some of the bored jaws that came with the chuck.
Next thing is to set up for jaw boring, so I need to investigate clamp rings that allow the boring with the jaws under compression.
vtsteam:
Sorry about the mistake, Andrew. I know how that feels. :bang: :bang:
On a regular basis! :beer:
awemawson:
Only myself to blame Steve!
But thanks for the sympathy
awemawson:
Yesterday afternoon the new EN8 bar arrived, so today I re-made the adaptor sans cock-up, and it's installed in the lathe and works ok.
No pictures as it looks just the same as the previous one :clap:
Now perhaps I can return the operating pressure to it's set point and start seeing if it grips ok :scratch:
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