Wanting Gcode for an arc lathe
02 Sep 2016 20:28 #79931
by andypugh
Yes, for this application using R-format arcs is perfectly safe and much easier.
To get the result you want, you will need to put the lathe in Radius mode. (I don't even try to work out lathe arcs in diameter mode).
Also be aware that for lathe Arcs you need to pretend you are laid in the piles of swarf looking up at the workpiece to get the G3 and G2 correct.
Replied by andypugh on topic Wanting Gcode for an arc lathe
ps can this also be done without the ( I) peram using X Z R
Yes, for this application using R-format arcs is perfectly safe and much easier.
To get the result you want, you will need to put the lathe in Radius mode. (I don't even try to work out lathe arcs in diameter mode).
Also be aware that for lathe Arcs you need to pretend you are laid in the piles of swarf looking up at the workpiece to get the G3 and G2 correct.
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02 Sep 2016 20:56 - 02 Sep 2016 22:01 #79935
by BigJohnT
Notice the arc diameter and the arc center which puts the cut path at X1407.2435 which doesn't sound like what you want. If the stock is 4mm in diameter then the X center would be something like -1409.25.
I needed to upload again, must have not done that right. Should say version 1.8.2.
JT
Replied by BigJohnT on topic Wanting Gcode for an arc lathe
OK I have tried again with:-
2
-75
2814.5
3.06
356.94
CW
It is giving me X values of about 48 which can't be right.
After reading your last post#79879 I re downloaded it but I don't see any changes. Is the wizard only set up for inches as I am using metric.
Notice the arc diameter and the arc center which puts the cut path at X1407.2435 which doesn't sound like what you want. If the stock is 4mm in diameter then the X center would be something like -1409.25.
I needed to upload again, must have not done that right. Should say version 1.8.2.
JT
Last edit: 02 Sep 2016 22:01 by BigJohnT.
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02 Sep 2016 21:42 #79939
by Clive S
Replied by Clive S on topic Wanting Gcode for an arc lathe
Thanks Andy I did get it working with XZR I did some fresh air cuts first.
JT. I would still like to understand your wizard and look forward to you uploading the new file version 1.8.2 Thanks for your input.
JT. I would still like to understand your wizard and look forward to you uploading the new file version 1.8.2 Thanks for your input.
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02 Sep 2016 22:01 #79943
by BigJohnT
Replied by BigJohnT on topic Wanting Gcode for an arc lathe
It is uploaded already.
JT
JT
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05 Sep 2016 17:18 - 08 Sep 2016 11:15 #80054
by Clive S
Replied by Clive S on topic Wanting Gcode for an arc lathe
Ok I am back to tying to get the correct arc. Can you please check my code I have set it up for dia mode
The chord length (length of roller) is 165mm and I am wanting a 1.5mm crown in the middle (it is a roller that I want to crown)
I think that I have read somewhere that you use the radius in the G3 even if you are in diam mode.. Is that correct?
G0 G40 G18 G80 G21 G49 G95
G90 G7
f200 S400
G1 x 125 z0
G3 x 125 z-165 r2269.5 f50
g0 X130
Z1
m2
The problems that I have is a) the crown appears to be at the highest about 3/4 down the length on the roller ie about Z-120
edit I sorted this I was not understanding the code correctly
This is my main problem:-
b) The feed rate is running at the G0 rate and not the G1 rate
I am using 2.7.6
Edit I have found that the feed rate needs to be in mm/sec for the arc code that is why it appeared to be running at the G0 rate
The chord length (length of roller) is 165mm and I am wanting a 1.5mm crown in the middle (it is a roller that I want to crown)
I think that I have read somewhere that you use the radius in the G3 even if you are in diam mode.. Is that correct?
G0 G40 G18 G80 G21 G49 G95
G90 G7
f200 S400
G1 x 125 z0
G3 x 125 z-165 r2269.5 f50
g0 X130
Z1
m2
The problems that I have is a) the crown appears to be at the highest about 3/4 down the length on the roller ie about Z-120
edit I sorted this I was not understanding the code correctly
This is my main problem:-
b) The feed rate is running at the G0 rate and not the G1 rate
I am using 2.7.6
Edit I have found that the feed rate needs to be in mm/sec for the arc code that is why it appeared to be running at the G0 rate
Last edit: 08 Sep 2016 11:15 by Clive S.
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