- Joined
- Mar 8, 2015
- Messages
- 53
Ya still getting the just of posting here, forgive me for typing in the copy/paste portion of my post.
Yea, my 12Z is what I was referring to.
I am not a big fan of auto-downfeed. I have used it on bridgeport for boring holes. The advantage is that you get a better finish quality using the auto down feed. The BIG disadvantage is the release mechanism that stops the down feed isn't real accurate, so you don't end up with the hole consistently at the depth you want it. Not a big deal if 0.020" is acceptable error. A real big deal if you want to get within 0.005".In any ones opinion, how important is the auto down feed option on the quill ? Seems as a hobby machinists I could live without that.
The BIG disadvantage is the release mechanism that stops the down feed isn't real accurate, so you don't end up with the hole consistently at the depth you want it
Ya Gyro, I would love to have that PM935, that would eliminate my budget, but I would get the XY and Z to cover all I would need and the ragidaty of the bigger mill. The Grizzly 9901 is also comparable.
I noticed the specs are very similar on the Charter Oak 12 Z and the PM 940m, the Y on both are 12". I don't think PM has shipped that mill as of yet.
In any ones opinion, how important is the auto down feed option on the quill ? Seems as a hobby machinists I could live without that. My mill/drill and lathe are both manual so that's something I'm used to, but I installed a DRO on the Rongfu and would love to have a 3 axis on the new mill (or used mill).
I'm thinking there is a significant loss of ragidaty from the square column to the knee, even the smaller knee's like the Grizzly G0730 style.
Thanks for all the input fellas, great info!
The machines I have used (Sharp 1054, brand new) had about 0.010"+ flex in the hard stop. Impossible to get an accurate cut with the quill. Maybe not the norm, but it was the norm on every machine in the shop.The trick is to finish the pass manually by pulling the quill down against the hard stop as the feed disengages. It will normally hold better than 0.001.