On 11/24/23 02:43, gene heskett wrote:
On 11/23/23 22:16, gene heskett wrote:
[...]
My rotary table was not expensive, but it has an adjustment on the
depth of engagement of the worm, to allow backlash to be reduced.
I thought that was a fairly common arrangement.
Seems to be std, my 4" table and my bs-1 clone both have it.
[...]
To reference the bike brake suggestions, the minimum of a 160mm disk is
about 100mm too big for this. The top would be hitting the mills head as
it descends to do the work.
On Nov 22, 2023, at 1:06 PM, gene heskett <ghesk...@shentel.net>
wrote:
I'd have to agree Andy. I need to design a disk brake for my A
axis as
there's half a degree of slop in the worm drive which if it gets
to the
motor will be held, but the slop in the worm makes for sloppy looking
holes, but the activation method is still in my head. Even that is
only
important when drilling a hole for the handle. I'll come up with
something.
[...]
Or maybe both, Use the slot and wedge to aligh the table to the
nearest
degree and then clamp it with a hydraulic disk brake. Cost is
under $100.
see above, the disk it way too big.
[...]
And I tend to go for the simplest way:
Since I only need this with the square chuck at 0,90,180 or 270 degrees,
why not print a spacer to slip under the chuck locking it at those
points, maybe even stick it under the bottom of the chuck and give it
just a tap, a count or two, which would used the servo to lock the
spacer into position long enough to drill the hole? That is a 3NM motor,
and for reasonable amounts of time could exert considerable pressure,
enough to destroy the chuck by twisting out the center which is keyed to
The 5/1's output shaft. If too long a tap on the [] keys. I'll do it.
Problem solved, until it isn't. And its all printed in PETG. And I wrote
the .scad files, whats not to like? ;o)>
So I made a wedge, with a half degree taper angle, looks like a
rectangle at first glance, but one edge is tilted half a degree. My
guess at the height as a measured SWAG was 55.5mm is needed to fill the
space between the square bottom of the chuck and the mills table
surface, so I printed it 100mm long. Slipped under the chuck, it goes
in almost exactly to the center of the wedge so the first one is the
last one.
The stick will have its own wiggle room if not seated solidly into the
chuck as I have a thin square of closed foam between the stick and the
full depth of the chuck but the worst movement would be only 5 thou at
worst case as the sides of the chuck are tilted outward a small amount
to make its non-adjustability into a self centered fit. I drive it into
the chuck with a live center in the tailstock. Live center drilled by a
copy of the chuck with a guide for the center drill instead of the worm
shaft. As accurate as the printer is.
So this problem is solved until its not. 3d printers are the handiest
things. They are also a maintenance nightmare, bring money (and time to
tweak) in little red wagons. But if you can imagine it, they can print it.
Take care & stay well all.
Cheers, Gene Heskett.
--
"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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