Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: JG on July 17, 2020, 03:49:56 AM

Title: Are G33 & G76 supported in Mach3?
Post by: JG on July 17, 2020, 03:49:56 AM

I'm investigating 'Thread Milling' but cannot find any details about the parameters I need to add after a G33 or G76 call. Using the [ G-Code ] button in Mach3, these codes are not listed so there are no 'hints' and I can't make head nor tail of what is supposed to happen after I select the 'Thread Milling' Wizard -- it simply shows me a new screen with Exit. Post Code, etc. along with a number of apparently editable dimensions which return to the initial state upon exit. The [ Post Code ] does not alter the 'No File Loaded' message.

Since I am looking to make 'large' (but short) threads  -  100 - 200mm dia and 2 - 4.5mm pitch  -  using a single point tool a 'Tap' is not an option  :)
I understand the complexity of threads needing a very specific feed rate in the Z axis which will not (necessarily) be the same as the feed rate in X & Y but cannot yet see any G-Code that will achieve that.
Any input appreciated!

Title: Re: Are G33 & G76 supported in Mach3?
Post by: TPS on July 17, 2020, 04:42:37 AM

here:
http://www.helmancnc.com/mach3-turn-g76-threading-canned-cycle/

is something about G76

Title: Re: Are G33 & G76 supported in Mach3?
Post by: JG on July 17, 2020, 04:54:11 AM

Thanks for the input TPS but that is about Mach3TURN  I'm looking for a solution for Mach3Mill  - sorry I should have made that clear in my post  :-[

Title: Re: Are G33 & G76 supported in Mach3?
Post by: TPS on July 17, 2020, 04:58:24 AM

for thread milling i am using a cam Programm called Estlcam.
it is cheap and easy to handle, also for other parts to create cnc code.

https://estlcam.de/

sorry the side is in German, but the Software can be switched to english.

Title: Re: Are G33 & G76 supported in Mach3?
Post by: TPS on July 17, 2020, 05:03:43 AM

here:

https://www.youtube.com/watch?v=xO-GHEIIOQQ

is a Video, where he demonstrates how it works.

Title: Re: Are G33 & G76 supported in Mach3?
Post by: JG on July 17, 2020, 05:22:06 AM

Thanks, I'd already found that video and watched it before your re-post came in  :)
It looks to do the business - though that video only shows 'Standard' threads, I'm sure 'specials' are also catered for. 

What it doesn't tell me is what parameters I need to enter when writing G-Code by hand.  Yes I am a masochist!   ;D

Title: Re: Are G33 & G76 supported in Mach3?
Post by: TPS on July 17, 2020, 05:27:51 AM

i am affraid G76 will only work on in turn mode, but i am not a specialist.

Title: Re: Are G33 & G76 supported in Mach3?
Post by: JG on July 17, 2020, 05:37:45 AM

Is that as far as Mach3 is concerned?
I see G76 listed as also available as 'Fine Boring Cycle for Milling' which seems to suggest that the Z feed can also be specified as a separate parameter.  It also 'Includes OSS and shift (oriented spindle stop and shift tool off centerline for retraction)'  -  I just can't find any reference to the form that the parameters take.