On Wed, 5 Dec 2007, Roland Jollivet wrote:
>
> I would not use gears to drive the arms, but feedscrews, forming a triangle,
> much like a mechanical shovel. I did not draw that all in as it was getting
> real late.
once you start making triangles out of feedscrews, the madness sets in...
http://en
I like the idea of rotary joints to eliminate linear bearings. But you are
now forced into a complicated drive mechanisim
at each rotary joint.
It's hard to beat lead screws for simplicity.-
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On Wednesday 05 December 2007, Anders Wallin wrote:
>John Thornton wrote:
>> Yea, being on the other side of the planet from McMaster Carr has got to
>> suck...
>
>It gets worse. McMaster Carr will currently not sell anything to non-US
>customers. I tried ordering something a while ago and back cam
John Thornton wrote:
> Yea, being on the other side of the planet from McMaster Carr has got to
> suck...
>
It gets worse. McMaster Carr will currently not sell anything to non-US
customers. I tried ordering something a while ago and back came a 5-line
answer about "increasingly complex export
On Wednesday 05 December 2007 12:14, Roland Jollivet wrote:
> Hi All
>
> Thanks for all the informative replies. I'll pursue the references.
> Sounds like it's doable, but the time/effort spent on software development
> will exceed the material savings.
On a rigidity for rigidity, accuracy for acc
Yea, being on the other side of the planet from McMaster Carr has got to suck...
As for using feedscrews to drive the arms that adds another part to the position
calculation as the amount of rotation changes with the angles as well as the
amount of force required to do said work.
Keep us posted
Hi All
Thanks for all the informative replies. I'll pursue the references.
Sounds like it's doable, but the time/effort spent on software development
will exceed the material savings. Unless of course, a few thousand were to
be made.
I would not use gears to drive the arms, but feedscrews, formin
On 4 Dec 2007 at 16:51, [EMAIL PROTECTED] wrote:
This is a very interesting and quite challenging project...
The cost to drive each joint of the pivot mill would far exceed the cost of
Dremil size slides. While the concept is sound the mechanics of the gears
would be the killer. You are designing
Oops. One additional thought, while the tool will always be
perpendicular to the work surface, the z kinematics are not trivial
either. But in that case I think you can use an Angular definition for
that axis. You'd just have to work out the motion in and out along the
axis of the forearm depen
It's a SCARA. They are very common for pic-and-place machines but one
of our guys a few years ago wrote a thesis while building one and
testing it for stiffness. I believe the guys was from India. The
current SCARA kinematic files are based on his work. Shouldn't be much
of a problem to contro
Message -
From: "Jeff Epler" <[EMAIL PROTECTED]>
To: "Enhanced Machine Controller (EMC)"
Sent: Tuesday, December 04, 2007 8:26 PM
Subject: Re: [Emc-users] Pivot mill
> What an interesting looking machine.
>
> We have a demo of a similar type of machine, cal
What an interesting looking machine.
We have a demo of a similar type of machine, called SCARA. In emc
2.2.2, you can run the sample configuration scara/scara.ini and see a
visualization of this machine on your desktop. Screenshot here:
http://axis.unpy.net/01170693566
In emc, the process o
esday, December 04, 2007 6:50 PM
Subject: [Emc-users] Pivot mill
Hi
I believe that the greatest hurdle in constructing a small CNC machine is the
cost of the linear slides, and I've been trying to think of a way to alleviate
this, and come up with a 'Pivot Mill'. Whil
Hi
I believe that the greatest hurdle in constructing a small CNC machine is
the cost of the linear slides, and I've been trying to think of a way to
alleviate this, and come up with a 'Pivot Mill'. While this is robotic in
configuration, it is for all intensive purposes intended to supplant a
co
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