Sorry, no poster comes with this...

Finally bought a 1" length of 6061 tubing with a 2.625 ID from Speedy
Metals. Bored it out to 2.675 or so then faced it to .625 long. Milled a
pocket, center drilled, ran a #25 in, followed with a #11 part way.
Tapped 10x24, over to the bandsaw, cut about 1/16th out (two cuts).
Tightened it up, nice and tight. Removed the collar, milled @ 1" flat
for a mounting plate for the bottom scale mount.

Yes, it would have been possible to take a .625" thick square of 6061
and bore/turn it, but that's a heckuva lot of chips.

The base for the scale had me flummoxed. I dislike drilling freehand
into cast iron. The current thought- I sawed off a length of .250 thick
6061 the same length as the scale's display, milled two bores in about
3mm deep for some rare earth magnets, then drilled and counterbored two
holes for the scale mounting screws.

Perhaps, when all is done, the magnets will hold the scale tight enough
to the cast iron mill head. Waiting on a 3/4" 2 flute mill to get here.
11/16ths just do not work (18mm dia magnets)

On Wed, 24 Feb 2010 08:54:00 -0600, Louis Ohland wrote:



Perhaps, when all is done, the magnets will hold the scale tight enough
to the cast iron mill head. Waiting on a 3/4" 2 flute mill to get here.
11/16ths just do not work (18mm dia magnets)

Look into getting a boring head.


Mark Rand
RTFM

to the cast iron mill head. Waiting on a 3/4" 2 flute mill to get here.
11/16ths just do not work (18mm dia magnets)

Look into getting a boring head.


I have two boring heads. This is America, if I choose to support the
economy, so be it.

On Wed, 24 Feb 2010 15:38:24 -0600, Louis Ohland wrote:

to the cast iron mill head. Waiting on a 3/4" 2 flute mill to get here.
11/16ths just do not work (18mm dia magnets)

Look into getting a boring head.


I have two boring heads. This is America, if I choose to support the
economy, so be it.


Supporting the economy is laudable, especially if it involves getting more
tools :-)

My point was more along the lines that a boring head will to a better job of
an 18mm clearance hole than either of the end mills.

regards
Mark Rand
RTFM

On 2/24/2010 16:07, Mark Rand wrote:

My point was more along the lines that a boring head will to a better job of
an 18mm clearance hole than either of the end mills.

To be clear, I was milling pockets that the magnets will fit into that
will pull the scale display unit. These pockets are not thru, just very
close. IIRC, aluminum will not block the magnetic attraction all that
much. I hope...

Made another scale mount for the quill DRO. This time, I measured the
screw spacing and laid it out... Thankfully, they used a M3x.5 screw,
which Ace Hardware has. Plus some lock washers to make up for c-bore
depth differences. Screws up tight and in-line.

Now to saw up the offset from the quill collar to the bottom scale
bracket... use some parallels and a piece of scrap in order to hold the
piece out far enough so I can bandsaw it lengthwise...