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Author Topic: G40, G41 and G42 have no effect.  (Read 18385 times)

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Offline RICH

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Re: G40, G41 and G42 have no effect.
« Reply #20 on: August 09, 2011, 10:22:26 PM »
Jim,
Just someting for you .

MODIFIED 8/24/11, LINK TO A MORE COMPLETE  WRITE UP IN MEMBERS DOCS:
http://www.machsupport.com/forum/index.php/topic,19264.msg133159.html#msg133159


RICH
« Last Edit: August 24, 2011, 05:51:42 AM by RICH »
Re: G40, G41 and G42 have no effect.
« Reply #21 on: August 10, 2011, 07:27:40 PM »
Rich,
Thank you.

This will give me something to study and chew on.

I appreciate it,

Jim



Offline BR549

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Re: G40, G41 and G42 have no effect.
« Reply #22 on: August 10, 2011, 09:27:54 PM »
hIya, Rich that is a great example, probably the best example i have seen on the web. I will file that away in my examples file.

Now "kidding of course" do you program the gcode for that gear by hand or use one of those fancy CAM thingies.

(;-) TP

Offline RICH

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Re: G40, G41 and G42 have no effect.
« Reply #23 on: August 11, 2011, 06:44:47 AM »
BR549,
No hand programming, I just draw the gear in CAD and make sure that the profile is drawn very well. Then export as a V12 dxf and use LC or Cambam to cut / offset the profile.
Not the sharpest tack on gears since I have no need to design them.  Gears can get complex since there are different standards and allowances so when one gets into it
it can get confusing.

There are a number of programs which provide the Gcode for a gear, they vary on what you need for input, and the gcode generation is part of the higher end CAM programs.
What i don't like is that you get a lot of code because the arc is broken up into small line segments . The code will run fine though. Art recongnized the need for a economical gcode program and frankly his program is the slickest I know of.

The spread sheet for the dimensions was really done so one could could make a gear cutter or measure or figure out what the  existing gear is. For instance;
if one wanted to make a cutter he would define pitch, # teeth, and pressure angle and then use a diameter cutter with the closest tooth profile radius
to milll the blank or even machine it and use an indexed  4th axis to cut the gear . I posted the how to in show and tell.

I tried using the gear program Jim posted and quickly remenbered that it's been around a few years and is meant for cutting out gears based on a printed profile
which won't print accurately "here" and wasn't worth fiddling with. I personaly would buy arts program and not  purchase that one.
      
Later, got to go make a lliving,
RICH


 

Offline BR549

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Re: G40, G41 and G42 have no effect.
« Reply #24 on: August 11, 2011, 10:41:18 AM »
Does Art's program do 2.5d gears (xyz) or does it only do 4th axis gear cutting?

(;-) TP

Offline Tweakie.CNC

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Re: G40, G41 and G42 have no effect.
« Reply #25 on: August 11, 2011, 12:10:24 PM »
Terry,

It does the 2.5D (xyz) and 4th. axis and DXF etc. Pretty versatile and it just keeps getting better.  :D

Tweakie.
PEACE

Offline BR549

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Re: G40, G41 and G42 have no effect.
« Reply #26 on: August 11, 2011, 12:38:37 PM »
Cool I will check it out. Always looking for new gizmos and gadgets(;-)

(;-) TP
Re: G40, G41 and G42 have no effect.
« Reply #27 on: August 24, 2011, 12:01:09 AM »
hi all,
I got "TO DRAW A GEAR.pdf" to to open. Files certainly act oddly when grouped with this forum and Win7.

Thanks,
Jim Gray

Offline RICH

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Re: G40, G41 and G42 have no effect.
« Reply #28 on: August 24, 2011, 05:48:12 AM »
Jim,
I placed a more complete file on drawing gears in Members Docs. Here is the link:

http://www.machsupport.com/forum/index.php/topic,19264.msg133159.html#msg133159

RICH
« Last Edit: August 24, 2011, 05:52:57 AM by RICH »