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Re: Original Rong Fu 45..

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  • davekelloggs
    This might help, although it is from about 2004. Thomas Powell has a number of nice photo essays about converting his real RF-45 to CNC:
    Message 1 of 2 , Jan 31, 2013
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      This might help, although it is from about 2004. Thomas Powell has a number of nice photo essays about converting his "real" RF-45 to CNC:
      http://imageevent.com/tppjr/mill/rf45dovetailmill/cnc/zaxisballscrew;jsessionid=fjimal9r04.penguin_s

      --- In mill_drill@yahoogroups.com, "uhmgawa" wrote:
      >
      > Hi Folks,
      > After a series of issues with the clones I'm looking at an
      > actual Rong Fu 45 machine. One finding I'd tripped over was
      > the clones appear to use an acme screw for the column travel,
      > and the column is setup even on manual Z axis versions with the
      > top of the column open, flycut level, and tapped with a bolt circle
      > for the drive head. On the RF to my best interpretation of the
      > manual, it appears to use a rack and pinion to drive the head travel
      > with no provisions in the column for a powered drive.
      >
      > This isn't a fundamental issue as a ball screw is destined for the
      > head motion but I'm wondering if anyone has first hand attempted
      > NC of the Z axis in an original RF45? I'm curious whether the
      > rack/pinion still persists in current manufacture RF45s or if this
      > has been obsoleted by an acme screw drive similar to the clones?
      > If the former (rack) do any obstructions exist which might
      > complicate getting a ball screw mounted in the column such that
      > it can be driven from the top? Worst case would appear to be
      > needing to flycut the column top square, bore a hole for the
      > drive shaft and whatever drive mounting I decide upon. The clone
      > screw sits in compression between the nut and a lower bearing.
      > For the RF however, keeping the screw in tension from nut to a
      > TBD top bearing may be the most straightforward approach.
      >
      > I haven't decided on the RF definitively yet, so general feedback on
      > the quality/quirks/etc.. of bona fide RF45s would be appreciated.
      >
      > Thanks!
      >
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