|
Posted by oldjag on March 3, 2010, 12:58 pm
Please log in for more thread options
I'm having an issue with my posts on parts with non tangent radii, for
example a cube with rounded, but non tangent corners or round shapes
with a small flat on one side. When I post such parts, my Gcode shows
three arcs instead of one. The three arcs approximate the correct
single arc, but are quite visible. If I add even a tiny, say 0.005"
fillet, before and after the non tangent arc, the problem goes away.
The post works fine on shapes with tangent arcs and on full circles.
My machine, (an old Hurco), uses absolute arc parameters and I and J
coding. Pretty new to Solidcam and G code so this is a mystery to
me....Probably something wrong with my .gpp but I don't know what.
|
|
Posted by Ken Tukyfriedturkey on March 3, 2010, 2:34 pm
Please log in for more thread options
> I'm having an issue with my posts on parts with non tangent radii, for
> example a cube with rounded, but non tangent corners or round shapes
> with a small flat on one side. When I post such parts, my Gcode shows
> three arcs instead of one. The three arcs approximate the correct
> single arc, but are quite visible. If I add even a tiny, say 0.005"
> fillet, before and after the non tangent arc, the problem goes away.
> The post works fine on shapes with tangent arcs and on full circles.
> My machine, (an old Hurco), uses absolute arc parameters and I and J
> coding. Pretty new to Solidcam and G code so this is a mystery to
> me....Probably something wrong with my .gpp but I don't know what.
Am I correct in assuming the 0.005" arcs will be tangential and you will or
should still have 3 lines of arc code.
I am not familiar with Solidcam or its post processors but if you can look
into the PP is there a line of code which lays down the criteria for arcs.
|
|
Posted by oldjag on March 3, 2010, 5:09 pm
Please log in for more thread options
wrote:
>
>
> > I'm having an issue with my posts on parts with non tangent radii, for
> > example a cube with rounded, but non tangent corners or round shapes
> > with a small flat on one side. =A0When I post such parts, my Gcode show=
s
> > three arcs instead of one. =A0The three arcs approximate the correct
> > single arc, but are quite visible. =A0If I add even a tiny, say 0.005"
> > fillet, before and after the non tangent arc, the problem goes away.
> > The post works fine on shapes with tangent arcs and on full circles.
> > My machine, (an old Hurco), uses absolute arc parameters and I and J
> > coding. Pretty new to Solidcam and G code so this is a mystery to
> > me....Probably something wrong with my .gpp but I don't know what.
>
> Am I correct in assuming the 0.005" arcs will be tangential and you will =
or
> should still have 3 lines of arc code.
>
> I am not familiar with Solidcam or its post processors but if you can loo=
k
> into the PP is there a line of code which lays down the criteria for arcs=
.
Actually, after putting in the 0.005" fillets, the fillets do not
appear in the code, and the non-tangent arcs then become correctly
represented by one arc each in the code. I'm not sure of the reason
the 0.005' fillets do not appear in the output code. I think it might
be below the minimum arc lenght threshold setting. I've looked at the
arc settings in the MAC and .gpp post proccessor files and can't
identify why this is occurring. Probably a simple answer for someone
who has some SolidCam post experience.
|
|
Posted by Ken Tukyfriedturkey on March 4, 2010, 4:11 pm
Please log in for more thread options
wrote:
>
>
> > I'm having an issue with my posts on parts with non tangent radii, for
> > example a cube with rounded, but non tangent corners or round shapes
> > with a small flat on one side. When I post such parts, my Gcode shows
> > three arcs instead of one. The three arcs approximate the correct
> > single arc, but are quite visible. If I add even a tiny, say 0.005"
> > fillet, before and after the non tangent arc, the problem goes away.
> > The post works fine on shapes with tangent arcs and on full circles.
> > My machine, (an old Hurco), uses absolute arc parameters and I and J
> > coding. Pretty new to Solidcam and G code so this is a mystery to
> > me....Probably something wrong with my .gpp but I don't know what.
>
> Am I correct in assuming the 0.005" arcs will be tangential and you will
> or
> should still have 3 lines of arc code.
>
> I am not familiar with Solidcam or its post processors but if you can look
> into the PP is there a line of code which lays down the criteria for arcs.
Actually, after putting in the 0.005" fillets, the fillets do not
appear in the code, and the non-tangent arcs then become correctly
represented by one arc each in the code. I'm not sure of the reason
the 0.005' fillets do not appear in the output code. I think it might
be below the minimum arc lenght threshold setting. I've looked at the
arc settings in the MAC and .gpp post proccessor files and can't
identify why this is occurring. Probably a simple answer for someone
who has some SolidCam post experience.
You say the 0.005's do not appear in the code as arcs, but do they appear as
fine XY moves before and after the arc.
|
|
Posted by Cliff on March 6, 2010, 7:45 pm
Please log in for more thread options
On Thu, 4 Mar 2010 21:11:04 -0000, "Ken Tukyfriedturkey"
>
>wrote:
>>
>>
>> > I'm having an issue with my posts on parts with non tangent radii, for
>> > example a cube with rounded, but non tangent corners or round shapes
>> > with a small flat on one side. When I post such parts, my Gcode shows
>> > three arcs instead of one. The three arcs approximate the correct
>> > single arc, but are quite visible. If I add even a tiny, say 0.005"
>> > fillet, before and after the non tangent arc, the problem goes away.
>> > The post works fine on shapes with tangent arcs and on full circles.
>> > My machine, (an old Hurco), uses absolute arc parameters and I and J
>> > coding. Pretty new to Solidcam and G code so this is a mystery to
>> > me....Probably something wrong with my .gpp but I don't know what.
>>
>> Am I correct in assuming the 0.005" arcs will be tangential and you will
>> or
>> should still have 3 lines of arc code.
>>
>> I am not familiar with Solidcam or its post processors but if you can look
>> into the PP is there a line of code which lays down the criteria for arcs.
>
>Actually, after putting in the 0.005" fillets, the fillets do not
>appear in the code, and the non-tangent arcs then become correctly
>represented by one arc each in the code. I'm not sure of the reason
>the 0.005' fillets do not appear in the output code. I think it might
>be below the minimum arc lenght threshold setting. I've looked at the
>arc settings in the MAC and .gpp post proccessor files and can't
>identify why this is occurring. Probably a simple answer for someone
>who has some SolidCam post experience.
>
>You say the 0.005's do not appear in the code as arcs, but do they appear as
>fine XY moves before and after the arc.
>
Might be the type of machining options chosen along with INTOL/OUTTOL
settngs.
Doing surface machining along drive surfaces or just following planar curves?
--
Cliff
|
| Similar Threads | Posted | | SolidCAM | October 18, 2008, 7:17 pm |
| SolidCAM or Mastercam | February 13, 2009, 9:27 pm |
| Company History Of SolidCAM | August 29, 2009, 12:11 am |
| SolidCam GPP settings for Hurco KMB-1 | October 20, 2009, 11:36 pm |
| What's Significant And New In SolidCAM 2010? | March 29, 2010, 10:29 pm |
| SolidCAM 2009 At SolidWorks World. | January 28, 2009, 1:44 am |
| On September 10, 2008 | August 31, 2008, 10:51 pm |
| Statistics for alt.machines.cnc, 03 Mar 2008 | March 2, 2008, 10:39 pm |
| Statistics for alt.machines.cnc, 10 Mar 2008 | March 9, 2008, 10:38 pm |
| Re: Statistics for alt.machines.cnc, 24 Mar 2008 | March 24, 2008, 3:59 am |
|
|
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap
> example a cube with rounded, but non tangent corners or round shapes
> with a small flat on one side. When I post such parts, my Gcode shows
> three arcs instead of one. The three arcs approximate the correct
> single arc, but are quite visible. If I add even a tiny, say 0.005"
> fillet, before and after the non tangent arc, the problem goes away.
> The post works fine on shapes with tangent arcs and on full circles.
> My machine, (an old Hurco), uses absolute arc parameters and I and J
> coding. Pretty new to Solidcam and G code so this is a mystery to
> me....Probably something wrong with my .gpp but I don't know what.