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Posted by Cliff on March 3, 2010, 7:42 pm
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>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.
Why would you think it a function of the post?
--
Cliff
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Posted by oldjag on March 4, 2010, 12:13 pm
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wrote:
ote:
> >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 shows
> >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.
>
> =A0 Why would you think it a function of the post?
> --
> Cliff
Because the error is in the G code output from the post, ie I see the
"excess" arcs in the G code, the machine is just following the code.
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Posted by Cliff on March 6, 2010, 7:41 pm
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>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.
>>
>> Why would you think it a function of the post?
>> --
>> Cliff
>
>Because the error is in the G code output from the post, ie I see the
>"excess" arcs in the G code, the machine is just following the code.
Did you look at the CLDATA going into the post?
That comes from the CAM system.
--
Cliff
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Posted by cncmillgil on March 4, 2010, 6:21 am
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> 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 shows
> 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.
Could be a Hurco problem, noticing facets on the arcs? Are you using
cutter comp?
That could be an issue, Old controls sometimes have a hard time
calculating non tangent geometry using cutter comp. There's quite a
bit of math for every different situation.
Your Hurco does not have conversational input? Thats their strong
point.
--
BB's #37
Smoothly said
Easily read
That=92s the goal
From this troll
=A9=BF=A9
~gil~
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Posted by oldjag on March 4, 2010, 12:15 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. =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.
>
> Could be a Hurco problem, noticing facets on the arcs? =A0Are you using
> cutter comp?
> That could be an issue, Old controls =A0sometimes have a hard time
> calculating non tangent geometry using cutter comp. There's quite a
> bit of math for every different situation.
> Your Hurco does not have conversational input? Thats their strong
> point.
>
> --
>
> BB's #37
> Smoothly said
> =A0Easily read
> That=92s the goal
> =A0From this troll
>
> =A9=BF=A9
> ~gil~
The problem is in the G code output, not the machine. I see the
"extra" arcs in the G code.
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>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.