#emc-devel | Logs for 2011-06-10

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[02:09:22] <mozmck> jepler: you around
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[20:53:16] <tom3p> i use the polar move g17 g90 g1 @#<radius> ^#<xyplaneangle> z#<rise> ,
[20:53:24] <tom3p> the position is on a cylinder ctrd at x0y0z0, but should be on a sphere ctrd at x0y0z0,
[20:53:24] <tom3p> else the radius is not respected
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[20:56:53] <KimK> I think the radius is respected, but only in the XY plane. At least that's how the G10 L2/L20 polar shift works, only Z rotating around XY, then ABC, then UVW. But I'm not an expert, comments are invited. If it doesn't work that way, maybe it should?
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[20:59:08] <KimK> If anyone has any thoughts, comments, suggestions, please join in.
[21:01:22] <tom3p_> KimK, sorry dropped line. i've used other 'gcode' that had 2 angles to describe the ray in space,
[21:01:31] <tom3p_> one angle was in the g17 18 19 plane
[21:01:39] <tom3p_> other is the angle to the 'pole'
[21:02:01] <tom3p_> those 2 with a raylength, fully describe a ray in space
[21:02:52] <tom3p_> i can work around it a,d cant hack the internal code to implement it, and appreciate whats been done. not nagging
[21:04:20] <tom3p_> i was a bit surprised when my little code traced a cylinder rather than a hemisphere ;)
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[21:11:07] <KimK> What are you trying to do? Can you pastebin your gcode?
[21:11:39] <tom3p_> http://pastebin.com/mjNV0eM5
[21:11:50] <tom3p_> i wanted a hemisphere ;)
[21:13:14] <tom3p_> http://imagebin.org/157718 boing!!!
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[21:15:15] <tom3p_> the code is wrong, but i doubt the distance from pole center to end of ray should be any longer than programmed
[21:17:54] <tom3p_> for one thing it should iterate over 90 degrees, not 360 (doh!)
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[21:19:54] <tom3p_> which does give me a purely cylindrical spring with descreasing spacing or 'winds' ( no more counterwinding )
[21:19:58] <KimK> One other thing you might add is that you do have a sin to reduce the "height" of Z, but I don't see a cos to reduce the radius of XY.
[21:21:29] <tom3p_> http://imagebin.org/157720
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[21:22:54] <tom3p_> i use the sin of the angle times the programmed radius for the Z, i may have to calc a new ray lenght too, but think i'll plot in cartesian now
[21:23:15] <tom3p_> and calc the xyz point and do dot to dot
[21:24:28] <tom3p_> oh, my point was i should reduce the radius, it should remain static in a sphere from the x0y0z0
[21:24:37] <tom3p_> i should not reduce....
[21:24:58] <tom3p_> cus thats what a sphere is
[21:25:05] <KimK> Maybe on line 51 try something like: g90 g1 @[#<hemirad>*[cos[#<thiszangle>]]] ^#<thisxyangle> z#<thisz>
[21:25:28] <tom3p_> yep
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[21:29:07] <tom3p_> http://imagebin.org/157722
[21:29:19] <tom3p_> hello hello hello, wots all this sphere?
[21:29:44] <tom3p_> thks KimK, solved the code
[21:29:54] <KimK> Hey, looks, good, congrats!
[21:29:58] <tom3p_> i do suggest the 2 angles for polar would be good
[21:30:11] <tom3p_> the radius should not change
[21:30:44] <KimK> I'm sure that here, your suggestion will be noticed.
[21:31:48] <tom3p_> i can supply the heidenhain docs for how they use it, they add in another code 'set pole center' to supplant the g92'ing described in the docs
[21:33:29] <KimK> This is a feature on a Heidenhain control? OK. I wonder how a Fanuc would handle the same thing?
[21:34:04] <tom3p_> i had polar on systems 6,10 & 12 but dont know newer
[21:34:22] <tom3p_> on fanuc 6.10.12...
[21:34:54] <tom3p_> its easy to get polar on a fanuc, just pay to have the bit flipped :)
[21:35:04] <KimK> OK. It's certainly something to keep in mind. Oh, BTW, what are you making?
[21:35:25] <tom3p_> skunk asked about it and it bugged me ;)
[21:35:51] <tom3p_> i'd done it before so i kept at it
[21:35:55] <KimK> Ah, OK. Got to keep skunkworks happy, lol.
[21:36:12] <tom3p_> thx!
[21:36:22] <KimK> you bet
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