Hood
I am obsessed.
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- 16,936
- Location
- Carnoustie, Scotland
This is for the perusal of @Richard. after we were talking about taking a 10mm DOC on a lathe and I said I had done it previously on my Computurn.
Originally the spindle had been an 11KW induction motor that drove the spindle via a gearbox with 8 possible speeds in high gear and 8 in low, so plenty of torque but fixed speeds were not the best even though they could be changed on the fly as the gears were engaged by electromagnetic clutches.
I picked up a 12KW servo and fitted that 1:1 with the spindle which gave me infinitely variable speed between 0 and 2000rpm. The drawback however was less torque but in reality that is never an issue as normally the most I take is a 5mm depth of cut and more usually just 3mm.
Anyway decided, due to the conversation, to give it a go with the servo. The spindle load meter instantly hit 150% but I decided to see how long it would last, it managed to do 58mm of cutting before the spindle drive faulted on over current.
Anyway here is the video, 60mm dia EN8 steel being taken down to 40mm in one pass and then the spindle faults and finally the carbide insert fractures
Originally the spindle had been an 11KW induction motor that drove the spindle via a gearbox with 8 possible speeds in high gear and 8 in low, so plenty of torque but fixed speeds were not the best even though they could be changed on the fly as the gears were engaged by electromagnetic clutches.
I picked up a 12KW servo and fitted that 1:1 with the spindle which gave me infinitely variable speed between 0 and 2000rpm. The drawback however was less torque but in reality that is never an issue as normally the most I take is a 5mm depth of cut and more usually just 3mm.
Anyway decided, due to the conversation, to give it a go with the servo. The spindle load meter instantly hit 150% but I decided to see how long it would last, it managed to do 58mm of cutting before the spindle drive faulted on over current.
Anyway here is the video, 60mm dia EN8 steel being taken down to 40mm in one pass and then the spindle faults and finally the carbide insert fractures