Re: Original Rong Fu 45..
- 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:
--- In email@example.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.