- Joined
- Jan 10, 2019
- Messages
- 1,042
I have a PM-935 mill on the way and thought that a power downfeed would be a fun project – not necessarily a requirement, but sometime fun to build. Reading through various threads, there are concerns about not dinging up the spindle nut, in addition to ensuring proper engagement, as well as the problem of the tool either not releasing, or dropping onto the work. Some people say that they switched to an ER32/R8 collet holder as a solution, and on this I need clarification.
I believe that the ER32 holder is intended for CNC use, but some people use them on manual mills to avoid having to mess with the drawbar. I'm guessing that using a spanner wrench on the collar as opposed to reaching up to the spindle nut is the reason why. Since this is my first mill, I don't have any tooling yet, so it makes no difference whether I buy R8 or ER32 collets.
Keep in mind I know just enough to be really dangerous, so please correct any of my thinking.
I believe that the ER32 holder is intended for CNC use, but some people use them on manual mills to avoid having to mess with the drawbar. I'm guessing that using a spanner wrench on the collar as opposed to reaching up to the spindle nut is the reason why. Since this is my first mill, I don't have any tooling yet, so it makes no difference whether I buy R8 or ER32 collets.
Keep in mind I know just enough to be really dangerous, so please correct any of my thinking.