Hi everybody,
I am currently looking for the drawbacks of hydraulic expansion chucks and collet chucks.
There is not so many sources telling about these. I have checked some engineering e-books and some articles and it seems that hydraulics are better than the collet chucks. But the comparisons on the articles are generally made between better quality hydraulic chucks and ER type collet chucks so it actually does not give an opinion since I am looking for the high quality collet chucks like Nikken and Kojex.
Vibration dampening, gripping force, rigidity, cost, spare parts, balance, lifetime, runout accuracy are the features i'm looking for.
What i know is that the hydraulic fluid in hydraulic chucks make a vibration dampening effect and collet for the collet chuck does the same effect also. One of the most important features is gripping force since the axial forces are much higher than radial forces in high speed machining. And gripping force of the collet chucks are better than the hydraulics. I am not pretty sure about rigidity. Hydraulics are cheaper and there is no need of spare parts. Collet chucks' inner structure are symmetric hence their balance is better. Runout is almost same for both.
This is what i could find out and i need to know more about it. Please share your views, knowledge and experiences. Thank you. Sorry for my average english.