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does G76 canned cycle work in the X as well?

cgrim3

Cast Iron
Joined
Dec 4, 2020
Location
Baltimore
Hi,

We use the G76 canned cycle to cut straight and tapered threads all the time.

However, I saw on youtube somebody cutting a scroll with a grooving insert using a G32. We don't use G32 much in the shop I work at.

Scroll Threading - YouTube

Is it possible to do this same operation using a G76?

Thanks,

Chris
 

angelw

Diamond
Joined
Sep 10, 2010
Location
Victoria Australia
Yes. You need to add an R value in the second line.

Sent from my LM-V600 using Tapatalk

I don't believe so; not with a G76 Cycle. The "R" address is used to specify the amount of Taper in a tapered thread and one could argue that an amount of taper could be specified so that the cut plane is perpendicular to the Z axis, but the G76 Cycle is basically a longitudinal thread cutting cycle, starting from a Z coordinate, cutting to another Z coordinate.

There is no reference to cutting a Scroll or Face Thread in the Fanuc Manual with a G76 Threading Cycle, but its specifically described using G32.

Regards,

Bill
 
Last edited:

sinha

Stainless
Joined
Sep 25, 2010
Location
india
In G32, the lead is measured along the Z axis or the X axis, depending on whether the toolpath makes an angle less or more than 45 degree wrt the Z axis.
In G76, the lead is always measured along the Z axis. Therefore, it cannot be used for scroll threading.
 

doug925

Titanium
Joined
Nov 21, 2002
Location
Houston
Hi,

We use the G76 canned cycle to cut straight and tapered threads all the time.

However, I saw on youtube somebody cutting a scroll with a grooving insert using a G32. We don't use G32 much in the shop I work at.

Scroll Threading - YouTube

Is it possible to do this same operation using a G76?

Thanks,

Chris


I do not know about other brands, but Okuma does it with a G71 (transverse threading)
 








 
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