Gallery, Projects and General > Project Logs
Oh Blimey I bought a CNC Lathe !!!!
awemawson:
Today I managed to set up the proximity sensor actuator etc and after a few tweaks got to what I think is a satisfactory result. It's a question of setting the length of my temporary adjustable adaptor such that the system acknowledges that the chuck is gripping WHEN the chuck is gripping and not loose :bugeye:
I wrote a little diddy program to repeatedly clamp the chuck, start clockwise at 100 rpm, pause for two seconds then unclamp the chuck. This just repeats so that I could observe the led on the proximity sensor and the jaws of the chuck
awemawson:
Then a took a couple of short videos of both ends of the action.
In this one you have to look VERY closely to see the chuck jaw mounts actually moving (no jaws fitted yet)
And this one from the outer end of the spindle shows the movement of the co-axial hydraulic cylinder and again by looking closely you will see the led on the proximity sensor going on and off as it crosses the step in the bit I made yesterday
I'll still play about a bit more but at the moment it's looking as if I need 110 mm of that 12 mm studding protruding forwards from my temporary adaptor.
Next step is to remove the chuck and adaptor, and reassemble it on the bench with 110 mm poking forwards, allowing me to measure a definitive length for my adaptor from end to end. All this is to avoid messing up when machining that huge chunck of expensive EN8 :scratch:
awemawson:
At last I got back into the workshop (had to clear half an acre of scrub that was over grown with bramble and gorse - by heck that flail came into it's own !)
Enough tests I decided - break it down and measure up what you need to make. So I removed the chuck having first carefully measured the thread protrusion. Then I re-assembled my mock up set to the same measurement, which allowed me to measure the over all length.
awemawson:
So at long last I could draw up the part I need to make with a reasonable chance that it'll be the right size :ddb:
awemawson:
So that big bar of EN8 was turned into an adapter and a HUGE pile of swarf
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