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Author Topic: Newbie need help with Lathe  (Read 3401 times)

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Newbie need help with Lathe
« on: May 01, 2009, 10:55:26 PM »
I am just starting out with lathe.  I have bobcad 23 lathe cam. Is there is anyone out there that could post a bobcad lathe file, for output to mach so I can learn from it.  I have created a test file in bobcad and posted it in a mach post but when I load into machturn I can see some of the tool path but where ever there are arcs the screen has a bunch of circles. I am not sure of what I have setup wrong.  My code is outputting I,K for arcs, I also tried with r arcs, same thing. Can anyone please point me in the right direction to get this figured out. I have in closed a copy of the g-code.

Thanks
Tom

Offline RICH

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Re: Newbie need help with Lathe
« Reply #1 on: May 02, 2009, 12:13:11 AM »
Torn,
Your getting I & K instead of I & J  ( mill x & y ) because "k" is associated with the z axis of the lathe in the code. For those goffy, we call them crop circles,  go to config>ports & pins>turn options  and check or uncheck
"Reversed Arc's in Front Post".

RICH
 
I looked at you file in Turn and i had to change in config>general logic> check IJ MODE to INC and Distance Mode to Absolute.
Additionaly when you load the file there are some G97 codes which do not have a S500 value ( or whatever - so i just added it ) for the spindle speed. One last thing are a few moves which i point to in the attached pic of the profile. I don't know if that is what you actualy
wanted to do but the moves look a little out of place.
I am not familar or use bobcad so can't be of any help there. There others in here who do use it though and may remark.
Hope this helps,
RICH
« Last Edit: May 02, 2009, 12:42:49 AM by RICH »
Re: Newbie need help with Lathe
« Reply #2 on: June 08, 2009, 03:09:21 AM »
I was wondering if someone can explain what changing the IJ Mode from Inc. to Absolute does in comparision to unchecking the "Reverse Arc's In Front Post".

I was getting the crop circles too and swithced from Inc. to Absolute, but being anal I want to know what the difference is? Basically I don't know what "reversed arc's in front post" is? Thanks.
« Last Edit: June 08, 2009, 03:11:12 AM by Cartierusm »

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Re: Newbie need help with Lathe
« Reply #3 on: June 08, 2009, 07:35:26 AM »
Cartierusm,
In a few days there will be a tutorial on Arc Programing for the Lathe posted in the Member's Doc's section which will answer your question's.

RICH

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Re: Newbie need help with Lathe
« Reply #4 on: June 28, 2009, 09:40:00 PM »
Cartierusm,;
Have a look at this tutorial. Here is the link:

http://www.machsupport.com/forum/index.php/topic,11932.msg76353.html#msg76353

Let me know if it does any good for you.

RICH
Re: Newbie need help with Lathe
« Reply #5 on: June 29, 2009, 12:42:56 AM »
I solved the problem buy changing the setting but thanks, I'll read to get a better understanding.