In article
,
Rex wrote:

On Jun 19, 9:20*am, Joseph Gwinn wrote:
My US Burke Millrite model MVI vertical mill (resembles a Bridgeport,
but 2/3 the size) came with a X-Axis power feed, an Asong AS-250. *This
unit never really worked correctly, and kept on blowing speed control
pots out, as discussed in the thread "Repair of an Asong AS-250 X-axis
power feed" in January 2010. *This is a general problem with Asong.

[snip]

Joe Gwinn

Good job Joe.

Thanks.


I have a new import power feed waiting for me to
install it on my Powermatic Millrite. There was an article on this in
HSM a few years back. Seems like there was more fabrication and
modification involved that what you mentioned. I haven't found a copy
of that article, but I think I have the text and the photos the author
used.

I'd be interested in the HSM article as well.

The most time consuming part of the effort was precisely measuring the
locations of the four large flat-head hex-socket machine screws that
hold the adapter plate to the cast iron end bracket. I think the
original was done by clamping plate to bracket and drilling through
both, so the parts matched exactly, but were on no precise pattern.
Anyway, I did measure them well enough, and the new plate screws to the
bracket perfectly.

I reused a few parts from the Asong installation, but it would not have
been that hard to make those parts, if they didn't come in the kit.

Actually, while I didn't do this, I should have called Servo and asked
them which kits are best for mills not directly supported. I used their
standard kit for such mills, but for instance the Asong came with a
suitable extension shaft, while the Servo did not.

By the way, the MVI will work just fine with the right hand table
bracket missing and the end of the leadscrew flopping in the breeze, so
you would have no problem milling the key slots in the adapter using
some small endmills. (X-axis motion is controlled by the left hand
table bracket assembly.) The trick is black sulfur oil and blow the
chips out of the slot from time to time, so chip re-cutting doesn't
widen the slot.

Again, one can remove the entire X-axis leadscrew and use the same MVI
to drill the 0.125" diameter cross-hole leadscrew and extension shaft
together for the brass rod, using the Y-axis to position and center.

Joe Gwinn