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Effect of Tensioning a Boring Bar

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duncan webster14/02/2020 22:48:31
2330 forum posts
34 photos

OK I've changed it and sent it off to the FE man. as I said, don't hold your breath

Graham Meek18/02/2020 12:24:03
154 forum posts
131 photos

I managed to quantify the torque applied to the grubscrew on my boring bar yesterday. My 120 degree turn, produced by years of practice, produces a torque of 889 N mm. Unbrako recommend a torque of 1863 N mm on an M4 grubscrew, while HoloKrome recommend 2270 N mm. Unbrako even state this torque can be applied with a standard Allen Key.

While my torque is just under a 1000 N mm less than the lowest recommended value, this does still equate to a loading of 1111 N on the push rod, in old money 250 lb(f).




Edited By Graham Meek on 18/02/2020 12:25:09

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