So, I'm kinda thinking it'd be cool to make some moon disks, like this
http://www.mooneyesusa.com/shop/prod...roducts_id=474,
only without the snap-on features and for model airplane use (yes, I'm on
a mission).

These are obviously spun -- but how do they do it? They're spun _all
over_, which leads to some obvious problems in part-holding. Do they
spin part of it, then change the holder, then spin the rest? What do
they do?

Anyone know? Anyone have a good guess?

--
www.wescottdesign.com

On Nov 17, 2:33*pm, Tim Wescott wrote:
So, I'm kinda thinking it'd be cool to make some moon disks, like thishttp://www.mooneyesusa.com/shop/product.php?products_id=474,
only without the snap-on features and for model airplane use (yes, I'm on
a mission).

These are obviously spun -- but how do they do it? *They're spun _all
over_, which leads to some obvious problems in part-holding. *Do they
spin part of it, then change the holder, then spin the rest? *What do
they do?

Anyone know? *Anyone have a good guess?

--www.wescottdesign.com

I've seen some vids where they glue to a wooden form, maybe in this
case there is a small center piece that clamps tight enough to form
the very central part and also imparts enough pressure the backside
form can spin it.

Or, central part is formed in a special op, then it is transferred to
another machine.

Dave

On Thu, 17 Nov 2011 13:35:16 -0800, Dave__67 wrote:

On Nov 17, 2:33Â*pm, Tim Wescott wrote:
So, I'm kinda thinking it'd be cool to make some moon disks, like
thishttp://www.mooneyesusa.com/shop/product.php?products_id=474, only
without the snap-on features and for model airplane use (yes, I'm on a
mission).

These are obviously spun -- but how do they do it? Â*They're spun _all
over_, which leads to some obvious problems in part-holding. Â*Do they
spin part of it, then change the holder, then spin the rest? Â*What do
they do?

Anyone know? Â*Anyone have a good guess?

--www.wescottdesign.com

I've seen some vids where they glue to a wooden form, maybe in this case
there is a small center piece that clamps tight enough to form the very
central part and also imparts enough pressure the backside form can spin
it.

Or, central part is formed in a special op, then it is transferred to
another machine.

Glue might work. The ones I've seen are "spun" right up to the center of
the disk, although they may have been formed by other means and then had
a tool run over them (as yet another operation, presumably) to get the
look.

--
www.wescottdesign.com

"Tim Wescott" wrote in message
...

On Thu, 17 Nov 2011 13:35:16 -0800, Dave__67 wrote:

On Nov 17, 2:33 pm, Tim Wescott wrote:
So, I'm kinda thinking it'd be cool to make some moon disks, like
thishttp://www.mooneyesusa.com/shop/product.php?products_id=474, only
without the snap-on features and for model airplane use (yes, I'm on a
mission).

These are obviously spun -- but how do they do it? They're spun _all
over_, which leads to some obvious problems in part-holding. Do they
spin part of it, then change the holder, then spin the rest? What do
they do?

Anyone know? Anyone have a good guess?

--www.wescottdesign.com

I've seen some vids where they glue to a wooden form, maybe in this case
there is a small center piece that clamps tight enough to form the very
central part and also imparts enough pressure the backside form can spin
it.

Or, central part is formed in a special op, then it is transferred to
another machine.

Glue might work. The ones I've seen are "spun" right up to the center of
the disk, although they may have been formed by other means and then had
a tool run over them (as yet another operation, presumably) to get the
look.

--
www.wescottdesign.com

================================================== ==========

Holding disks for spinning shallow cups typically is done with a tailstock
holding something like a ball-bearing center, but without the sharp point.
It's pressed up against the disk, sandwiching it between the center and a
wooden form block held in the headstock end.

It puts a fair amount of thrust load on your headstock bearings. Lathes made
for the work have big thrust bearings.

--
Ed Huntress

On Thu, 17 Nov 2011 17:25:33 -0500, Ed Huntress wrote:

"Tim Wescott" wrote in message
...

On Thu, 17 Nov 2011 13:35:16 -0800, Dave__67 wrote:

On Nov 17, 2:33 pm, Tim Wescott wrote:
So, I'm kinda thinking it'd be cool to make some moon disks, like
thishttp://www.mooneyesusa.com/shop/product.php?products_id=474, only
without the snap-on features and for model airplane use (yes, I'm on a
mission).

These are obviously spun -- but how do they do it? They're spun _all
over_, which leads to some obvious problems in part-holding. Do they
spin part of it, then change the holder, then spin the rest? What do
they do?

Anyone know? Anyone have a good guess?

--www.wescottdesign.com

I've seen some vids where they glue to a wooden form, maybe in this
case there is a small center piece that clamps tight enough to form the
very central part and also imparts enough pressure the backside form
can spin it.

Or, central part is formed in a special op, then it is transferred to
another machine.

Glue might work. The ones I've seen are "spun" right up to the center
of the disk, although they may have been formed by other means and then
had a tool run over them (as yet another operation, presumably) to get
the look.

--
www.wescottdesign.com

================================================== ==========

Holding disks for spinning shallow cups typically is done with a
tailstock holding something like a ball-bearing center, but without the
sharp point. It's pressed up against the disk, sandwiching it between
the center and a wooden form block held in the headstock end.

It puts a fair amount of thrust load on your headstock bearings. Lathes
made for the work have big thrust bearings.

I was figuring that since I'm doing it with thin material for an itty
bitty part, I could get away with it even if my lathe is cheap and Indian.

--
www.wescottdesign.com

"Tim Wescott" wrote in message
...

On Thu, 17 Nov 2011 17:25:33 -0500, Ed Huntress wrote:

"Tim Wescott" wrote in message
...

On Thu, 17 Nov 2011 13:35:16 -0800, Dave__67 wrote:

On Nov 17, 2:33 pm, Tim Wescott wrote:
So, I'm kinda thinking it'd be cool to make some moon disks, like
thishttp://www.mooneyesusa.com/shop/product.php?products_id=474, only
without the snap-on features and for model airplane use (yes, I'm on a
mission).

These are obviously spun -- but how do they do it? They're spun _all
over_, which leads to some obvious problems in part-holding. Do they
spin part of it, then change the holder, then spin the rest? What do
they do?

Anyone know? Anyone have a good guess?

--www.wescottdesign.com

I've seen some vids where they glue to a wooden form, maybe in this
case there is a small center piece that clamps tight enough to form the
very central part and also imparts enough pressure the backside form
can spin it.

Or, central part is formed in a special op, then it is transferred to
another machine.

Glue might work. The ones I've seen are "spun" right up to the center
of the disk, although they may have been formed by other means and then
had a tool run over them (as yet another operation, presumably) to get
the look.

--
www.wescottdesign.com

================================================== ==========

Holding disks for spinning shallow cups typically is done with a
tailstock holding something like a ball-bearing center, but without the
sharp point. It's pressed up against the disk, sandwiching it between
the center and a wooden form block held in the headstock end.

It puts a fair amount of thrust load on your headstock bearings. Lathes
made for the work have big thrust bearings.

I was figuring that since I'm doing it with thin material for an itty
bitty part, I could get away with it even if my lathe is cheap and Indian.

--
www.wescottdesign.com

================================================== ===============
[reply]

Oh, sure. Any lathe can do some light spinning. The heavy thrust business
pertains to lathes that are dedicated to it, or that do heavy pieces. As the
stock gets thicker, the forces really multiply. Look at old photos of
spinning lathes from the '30s through the '50s, when they were spinning big,
thick disks, and you'll see that the forming tools had handles that were
four or five feet long, working against a pivot with just a few inches
hanging out on the working side. The leverage was huge.

My uncle was a good spinner and did a lot on the SB 10L that he passed on to
me, including some beautiful lamps me made from German silver.
Unfortunately, we didn't get to spinning as he was teaching me, before he
died. I've tried it but I create a lot of wrinkles. That means I'm not
putting enough pressure on the work as I work the tool out from the center.
You have to put so much pressure on it that you actually shrink the stock as
you go, at each increment of travel as you move the tool outward. It takes a
lot of skill.

You'll see what I mean when you try it. Don't get discouraged easily. They
tell me that everybody makes wrinkled messes until, all of the sudden, it
starts to work. Spinning tubes down to a neck is easier than spinning disks
into a cup.

--
Ed Huntress

Tim Wescott Inscribed thus:

So, I'm kinda thinking it'd be cool to make some moon disks, like this
http://www.mooneyesusa.com/shop/prod...roducts_id=474,
only without the snap-on features and for model airplane use (yes, I'm
on a mission).

These are obviously spun -- but how do they do it? They're spun _all
over_, which leads to some obvious problems in part-holding. Do they
spin part of it, then change the holder, then spin the rest? What do
they do?

Anyone know? Anyone have a good guess?

I would guess that they are pressed blanks, edge turned over, then
polished. The perforations around the inside edge of the rim would be
done before the edge is turned over.

--
Best Regards:
Baron.

On Thu, 17 Nov 2011 21:56:33 +0000, Baron wrote:

Tim Wescott Inscribed thus:

So, I'm kinda thinking it'd be cool to make some moon disks, like this
http://www.mooneyesusa.com/shop/prod...roducts_id=474, only
without the snap-on features and for model airplane use (yes, I'm on a
mission).

These are obviously spun -- but how do they do it? They're spun _all
over_, which leads to some obvious problems in part-holding. Do they
spin part of it, then change the holder, then spin the rest? What do
they do?

Anyone know? Anyone have a good guess?

I would guess that they are pressed blanks, edge turned over, then
polished. The perforations around the inside edge of the rim would be
done before the edge is turned over.

The original Moon disks (not the snap-on ones) were just flat aluminum
that had been dished on a spinning machine (somehow). You were then
expected to drill and tap your wheels for itty bitty screws to hold the
disks on at speed.

Whatever the original process was, it was low tech and I want to
replicate it (or at least get the look!) in 1.5" diameter on my lathe.

--
www.wescottdesign.com

Tim Wescott Inscribed thus:

On Thu, 17 Nov 2011 21:56:33 +0000, Baron wrote:

Tim Wescott Inscribed thus:

So, I'm kinda thinking it'd be cool to make some moon disks, like
this http://www.mooneyesusa.com/shop/prod...roducts_id=474,
only without the snap-on features and for model airplane use (yes,
I'm on a mission).

These are obviously spun -- but how do they do it? They're spun
_all
over_, which leads to some obvious problems in part-holding. Do
they
spin part of it, then change the holder, then spin the rest? What
do they do?

Anyone know? Anyone have a good guess?

I would guess that they are pressed blanks, edge turned over, then
polished. The perforations around the inside edge of the rim would
be done before the edge is turned over.

The original Moon disks (not the snap-on ones) were just flat aluminum
that had been dished on a spinning machine (somehow). You were then
expected to drill and tap your wheels for itty bitty screws to hold
the disks on at speed.

Whatever the original process was, it was low tech and I want to
replicate it (or at least get the look!) in 1.5" diameter on my lathe.

I recall seeing some 35mm dia, dome shaped, polished control knob
inserts kicking about. They were stamped out of 0.2mm thick aluminum.
I'll see if I can lay my hands on them.

--
Best Regards:
Baron.

On 11/17/2011 4:13 PM, Tim Wescott wrote:
.....
Whatever the original process was, it was low tech and I want to
replicate it (or at least get the look!) in 1.5" diameter on my lathe.


Ive heard of people making these for RC cars from the bottom of an
aluminum soda can.

Tim Wescott wrote:
On Thu, 17 Nov 2011 21:56:33 +0000, Baron wrote:

Tim Wescott Inscribed thus:

So, I'm kinda thinking it'd be cool to make some moon disks, like this
http://www.mooneyesusa.com/shop/prod...roducts_id=474, only
without the snap-on features and for model airplane use (yes, I'm on a
mission).

These are obviously spun -- but how do they do it? They're spun _all
over_, which leads to some obvious problems in part-holding. Do they
spin part of it, then change the holder, then spin the rest? What do
they do?

Anyone know? Anyone have a good guess?
I would guess that they are pressed blanks, edge turned over, then
polished. The perforations around the inside edge of the rim would be
done before the edge is turned over.

The original Moon disks (not the snap-on ones) were just flat aluminum
that had been dished on a spinning machine (somehow). You were then
expected to drill and tap your wheels for itty bitty screws to hold the
disks on at speed.

Whatever the original process was, it was low tech and I want to
replicate it (or at least get the look!) in 1.5" diameter on my lathe.



The originals were done in a 3 step process. The blanks were laid out
and cut and the holes drilled. Then they were mounted to a spinning form
with screws and spun into the form with a wheel tipped tool. Then they
were removed and mounted to the finishing form and spun to the final
shape and finish on the face. The two forms were basically mirror image
wood initially, then they turned steel ones.

For what you want the easy way would be to press spin them. Make a two
piece form out of steel. The outer form will have a dish in the shape
you want, this one will be attached to an adapter that will fit a drill
press chuck. Now make a mirror image one that will get mounted to the
vice/table. To use take your aluminum stock and with the press running
at a middle speed, just act like you're drilling holes. Coating the
aluminum with some LIGHT lube will make it easier.

--
Steve W.

"Tim Wescott" wrote in message
...
So, I'm kinda thinking it'd be cool to make some moon disks, like this
http://www.mooneyesusa.com/shop/prod...roducts_id=474,
only without the snap-on features and for model airplane use (yes, I'm on
a mission).

These are obviously spun -- but how do they do it? They're spun _all
over_, which leads to some obvious problems in part-holding. Do they
spin part of it, then change the holder, then spin the rest? What do
they do?

Anyone know? Anyone have a good guess?

--
www.wescottdesign.com

Tim - these show a bit:

http://www.youtube.com/watch?v=eU5Gq...eature=related

http://www.youtube.com/watch?v=25OlcOSZOsg

On Fri, 18 Nov 2011 09:54:58 +0800, Dennis wrote:

"Tim Wescott" wrote in message
...
So, I'm kinda thinking it'd be cool to make some moon disks, like this
http://www.mooneyesusa.com/shop/prod...roducts_id=474, only
without the snap-on features and for model airplane use (yes, I'm on a
mission).

These are obviously spun -- but how do they do it? They're spun _all
over_, which leads to some obvious problems in part-holding. Do they
spin part of it, then change the holder, then spin the rest? What do
they do?

Anyone know? Anyone have a good guess?

--
www.wescottdesign.com

Tim - these show a bit:

http://www.youtube.com/watch?v=eU5Gq...eature=related

http://www.youtube.com/watch?v=25OlcOSZOsg

All I needed to know.

Man, I love watching metal spinning videos. It's just like magic.

--
Tim Wescott
Control system and signal processing consulting
www.wescottdesign.com