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| Measure ER collet run out? |
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| DaveH:
Hi, Is there a specified or specific way the measure the run out. How far from the collet should I measure it? 5mm……..10mm …….50mm? :scratch: DaveH |
| doubleboost:
Hi Dave The less runout you have the better after playing around with my homemade holder this is the result Click the picture :thumbup: That is a metric clock less than .002mm at 3 inches :bugeye: :bugeye:very happy From what i have been told 1.5 thou is about the norm for a bought one John |
| DaveH:
Hi John, Is 3" from the collet the sort of standard for all sizes. Or does it change depending on the diameter. DaveH |
| doubleboost:
I would think the collet size would make no differance (the collets will be precision ground) It will be the holder that is in need of fettling 3 inches from the collett is just the length of the tool i had handy I am not sure what the speck is John |
| DaveH:
Hi, This is what I've found out from different sources. :scratch: a) Measure it 4 x dia from the collet. b) Measure it 1 x dia from the collet. c) Measure it as close to the collet as posible. Now (a) 4 x dia seems a long way to me. 12 dia ends up 48 mm from the collet. [ John did 3" ] (b) seems sensible. (c) seems to me the right place. (But I really don't know) How do the manufactures measure it. :scratch: I would still like to keep it simple for the home workshop. :D Anyone have any views or comment. I would like to hear. :D :beer: DaveH |
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