On 2/3/24 11:50, andy pugh wrote:
On Sat, 3 Feb 2024 at 16:47, gene heskett <ghesk...@shentel.net> wrote:
last incoming msg is dated 1/17/24 so we've essentially the same quiet gap.
I guess the next question is whether anyone posted to the list in that period?
I don't recall I did, I'm up to what little hair I have left in 3d
printer problems. Although I did print a vacuum snoot for my go704 that
also contains a prox switch to measure what its cutting. pix attached
The image is upside down with the large end driven onto the spindle
barrel of the g0704, and a 3 inch by 1/2 inch router bit extends out the
top about a quarter inch. the side pipe get a hose from the swarf vacumm
plugged in. The holes in the side pipe hold an 8mm prox switch. The yoke
beside it has a 14" bearing ball pressed into the hole, the turned
upside down an snapped over the pins sticking out of the side near the
top in this pix. To use, move z up 20 mm, move y to the rear around
50mm, the yoke swings by gravity, so doing a G38.2 deep enough to trip
the switch measures the radius of the work piece mounted between centers
of the Aaxis. Figure on making a measurement about 15mm from each end,
sutracting them to get a diff, and adding that diff to an offset used
for Z, to automatically cancel any taper caused to the diff in center
heights of the two ends of the shop made A axis. Start with that diff
var at 0, and by 3 passes, the taper which might be a mm at start, ought
to be less than wood can be accurately measured after 3 passes. Thee
will be 6 or 8 passes, making a 2" square hard maple stick into a 2"
round stick, ready for cutting the butress thread into it by moving it
to a 6040 gantry mill with an added B axis. That mill has a 24k motor
and a 1/16" rn tool with a 1/4" LOC, very fragile tool and making that
tool do the initial rounding is a 2 day job, vs around 2 hours just for
the thread. Turning 2 day job into 3 a day. More rpms from the mill
would be handier than sliced bread. I've been tempted to order another
empty head sled and fit it with a trim router in the barrel hole. But
then I face the reality of the pita it would be to change it each time.
I have done it all on the 6040, but w/o a tool changer, that is a huge
time sink. I maybe should get a pack of 3mm bits which would fit the ER
collet holding the teeny bit and try that as it would speed up the
rounding of the square stick by quite a few hours. That and rig a
permanent TLO contact, but that would also require a ground contact to
the tool. That 4 bearing 24k motor apparently has ceramic bearings as
the ER is not grounded by the bearings. Another 3d printer project...
And make a vac snoot for it, that rounding operation makes large qty's
of face powder fine saw dust. Do I have time to do all that? $64
question at my age. My next bday will make 90 of them.
Take care & stay well Andy.
Cheers, Gene Heskett, CET.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
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