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New Lathe
micktoon:
Hi Oz , when I was at John's we were looking at the lead screw as mine sounds like yours with plain castllated nut, John's looks like there might be some sort of safety slip clutch in the nut ? But the rear of thevnut is still casttlated and can be disengauged.
So it looks like its the same overall idea but has a safety lutch built into the nut ?
Cheers Mick
Manxmodder:
Thanks Mick, it sounds like the idea there would be to set the bed stop at the point you want to stop the threading tool from advancing any further along the job. When the saddle hits the carriage stop the clutch detent slips and leadscrew feed is prevented from overunning the disengagement point .
I guess its then a matter of disengaging the half nuts and returning the carriage to the pick up point of the next cut.
It looks an interesting and useful mechanism,hope John can give some greater detail of it's operation......OZ.
DavidA:
When the saddle hits the carriage stop the clutch slips
Wouldn't this throw your gearing out of sync and prevent the next cut from starting at the correct place ?
Dave.
Manxmodder:
Dave, the clutch would need to be of the single engagement point detent type then it can only engage at the same point in any 360 degrees of rotation. Visualise the castellated type but only having one male and female tooth to understand the concept I'm thinking off.....OZ.
DavidA:
Ah yes, a dog clutch. that makes sense.
I was thrown when you referred to the clutch slipping.
Dave.
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