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As well as pretty pictures, POVRay is very useful as a 3D design tool.
I've been designing a CNC router for the last few weeks and being able
to render it from any angle has helped me get over many design
difficulties.
Rarius
Post a reply to this message
Attachments:
Download 'iso-8859-1' (1 KB)
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"Rarius" <rar### [at] rarius couk> wrote:
> As well as pretty pictures, POVRay is very useful as a 3D design tool.
> I've been designing a CNC router for the last few weeks and being able
> to render it from any angle has helped me get over many design
> difficulties.
(Expected image, found a copy of your post in the attachment instead)
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"clipka" <nomail@nomail> wrote in message
news:web.49b24e8e4b56cbe340b1852c0@news.povray.org...
>
> (Expected image, found a copy of your post in the attachment instead)
It came through OK for me.
The image is also accessible at
http://rarius.co.uk/graphics/3axisrouter3.png
Rarius
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On Sat, 07 Mar 2009 10:45:14 +0000, Rarius wrote:
> It came through OK for me.
It did here as well, but your post was a mix of plain text and HTML,
that's probably why clipka had problems with it.
Switch your posting mode to text only (as you did in this post) and you
won't have this problem in the future.
Jim
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"Rarius" <rar### [at] rariuscouk> wrote:
> As well as pretty pictures, POVRay is very useful as a 3D design tool.
> I've been designing a CNC router for the last few weeks and being able
> to render it from any angle has helped me get over many design
> difficulties.
>
> Rarius
As always when designing such machinery, 'success lies in the details'--the
proper bearings, the elimination of mechanical backlash, etc. I'm curious as
to what type of threaded drive shafts you plan on using?
Something to be aware of (and this is from my own personal experience) is that
using *multiple* threaded shafts to drive a single axis can create problems and
headaches in trying to get things to work reliably (not insurmountable ones, of
course)-- the shafts need to be as parallel as is humanly possible--in two
axes--so the moving platform doesn't 'lock up' at some point. Perhaps you've
taken that into account already.
Good luck with the design; it looks very promising. (Someday I want to build one
of these things myself.)
Ken W.
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On Sat, 07 Mar 2009 14:26:10 -0400, Jim Henderson <nos### [at] nospamcom>
wrote:
> On Sat, 07 Mar 2009 10:45:14 +0000, Rarius wrote:
>
>> It came through OK for me.
>
> It did here as well, but your post was a mix of plain text and HTML,
> that's probably why clipka had problems with it.
It doesn't come through on the Web interface, though it works fine on my
Web browser's integrated news reader.
I noticed that your news poster, "MSHTML" (I wonder who that is?), makes
copious use of the <font> element. <font> was officially declared
unseemly at least 10 years ago, and no less that Micro$oft explained part
of the problem in a brilliant article:
http://www.microsoft.com/typography/web/designer/face7.htm
I love large corporations that practice what they preach. Good thing that
Web browsers are maintaining, uh... (subtracts in head), 19 years of
backwards compatibility, and keep tabs on each other so that, say, Opera
knows how MSHTML formats its attachments. Alas, povray.org's software
doesn't. (Just continue using plain text and avoid the whole mess.)
--
<Insert witty .sig here>
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On Sun, 08 Mar 2009 01:24:44 -0400, Cousin Ricky wrote:
> On Sat, 07 Mar 2009 14:26:10 -0400, Jim Henderson <nos### [at] nospamcom>
> wrote:
>
>> On Sat, 07 Mar 2009 10:45:14 +0000, Rarius wrote:
>>
>>> It came through OK for me.
>>
>> It did here as well, but your post was a mix of plain text and HTML,
>> that's probably why clipka had problems with it.
>
> It doesn't come through on the Web interface, though it works fine on my
> Web browser's integrated news reader.
>
> I noticed that your news poster, "MSHTML" (I wonder who that is?), makes
X-Newsreader: Microsoft Outlook Express 6.00.2900.5512
:-)
Jim
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> X-Newsreader: Microsoft Outlook Express 6.00.2900.5512
Yes I do use Outlook Express for accessing Usenet newsgroups.
I apologise to everyone who had difficulty reading my original post. I
accidentaly had HTML turned on for news posting. I have rectified this and
should now be posting in plain text.
Rarius
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Here is a plain text post with a updated image of my CNC design.
Rarius
Post a reply to this message
Attachments:
Download '3AxisRouter3.png' (196 KB)
Preview of image '3AxisRouter3.png'
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> As always when designing such machinery, 'success lies in the
> details'--the
> proper bearings, the elimination of mechanical backlash, etc. I'm curious
> as
> to what type of threaded drive shafts you plan on using?
The drive spindles are 12mm trapezoidal with a 3mm pitch
(http://www.worldofcnc.com/products.asp?recnumber=61) running in bronze nuts
(http://www.worldofcnc.com/products.asp?recnumber=47). The rails are 12mm,
16mm and 20mm ground shafts
(http://www.worldofcnc.com/products.asp?recnumber=14) running through linear
bearings (http://www.worldofcnc.com/products.asp?recnumber=16).
I bought a job lot from eBay. It included four spindles, three pairs of
> Something to be aware of (and this is from my own personal experience) is
> that
> using *multiple* threaded shafts to drive a single axis can create
> problems and
> headaches in trying to get things to work reliably (not insurmountable
> ones, of
> course)-- the shafts need to be as parallel as is humanly possible--in two
> axes--so the moving platform doesn't 'lock up' at some point. Perhaps
> you've
> taken that into account already.
You make a good point. Originally I was going to drive the two Z axis
spindles with two stepper motors. By tying the two Z axis drives together
with the toothed drive belt I don't beleive that I should have any problems
such as you describe.
I have changed the system from driving the spindles so that the spindles are
now locked in position and the nuts are rotated around them, thus pulling
themselves along the spindle. This should remove any problems from the
spindles wobbling as they turn and also removes the need for bearings at
both ends!
I think the problem of "racking" on the X axis is more of a worry. Although
not shown on the image I have decided to add a cable system like that used
on large draftsmans drawing boards to stop any rotational movement as the
carriage moves backwards and forwards along the X axis.
Rarius
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