Your submissions to the dropbox worked well, thanks for sharing this
Very nice project, and clear pictures showing project details.
Others might take notice of how unneccessary it is to send huge images (or
use giant images for other web postings).
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Very nice. Neat work.
A question.... I see worm gears, but how do you get automatic "X"
direction motion passes for the plain spur gears, or do you do multi
passes at small steps?
The "X" feed is manual. The aux. table has dovetailed ways, a gib, and is
fed at the lead angle by a 1/2-10 acme rod with a hand wheel on its end.
The main mill 'X" table is locked. Feed can be continuous or at the end of
each rev. of the blank. I find both work, but one can argue that feeding at
the end of each rev. is best. The blank is fed 'underneath' the hob.
I'm quite puzzled with your setup and doubt it works.
You have rotated the (sub-)table according to the hob's pitch. OK.
But if you feed your workpiece, you have to feed along its axis and *not*
along your table (X). There is an error exactly of the hob's pitch. If you
try it with a verrry wide gear, you'll see clearly. You get a spiral.
Looked like he has the indexer on a dovetail slide mounted on the
rotary table, with a seperate feed handwheel, so that the feed should
be exactly as you say, along the gear axis and not the main table
axis. Is there something else there I am not seeing?
Also -- note that the spaces in the filenames got converted to
underscores -- because spaces in filenames are a serious problem on
command-line driven systems, while everyone with a semi-modern system
can handle the underscores.
Nice photos, BTW.
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Perhaps you just removed them for pictures (the usual excuse, along with
"I'm perfect and that will never be a problem for me...eeeEEEYOUCH!")
but I'd want some guards for the gear trains. Being imperfect, and
comparatively fragile .vs. steel, I'd rather put an hour or two into
making guards than spend it in the emergency room.
===========Very nice job -- thanks for sharing.
What is your approximate setup time? How do you set/check the
===============When we are planning for posterity,
we ought to remember that virtue is not hereditary.
Thomas Paine (1737-1809),
Anglo-American political theorist, writer.
Common Sense, ch. 4 (1776).
Greetings. The desired lead angle is given on the hob, 1.7 degrees in my
case. I put a straight arbor between centers on the aux. table, place a
dial indicator on the rear column of the mill. and run the main mill table
back and forth , adjusting the table angular position for a difference in DI
reading of 0.104" in 3.5 inches of mill table travel. Mill table travel is
measured by the micrometer dials on its end. The arctan of 0.104/3.5 is
about 1.7 degrees- close enough. For a given hob, one could make a simple
gage referenced off the base of the main mill table and the aux. table. I
guess that starting from scratch, to mount a gear (with the same number of
teeth as the gear to be cut) on the output of the gear train on the rear of
the mill, set the angle, mount a prepared blank on the arbor, mount the
arbor, connect the telescoping drive shaft, takes about 20 minutes or less.
No longer than it takes to set a dividing head, an index plate, tailstock,
and align same when using single involute cutters. HTH, Jim.
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