G71 TIME LOSS BETWEEN OiD AND OiC

[ALEXCOMO]

Hi,
I recently buy a new lathe with fanuc oitd,
the same program whit g71 roughing type 2 (undercut) :

runned on 0itc take 9,30 min

runned on 0itd take 11,30 min

take more time on 0itd because it going to cut air!

The lathe are quite similar and i use same cutting speed

Anyone have similar experiance???

Thanks all

[g-codeguy]

Not familiar with that Fanuc model. Does it use a one or two block call? Two block call allows programmer to specify the retract amount. One block call would require changing this value in a parameter. At least that is my take on the subject.

[ALEXCOMO]

TWO LINE.

thanks for intersting

[g-codeguy]

In that case I have no idea. Sorry.

[underthetire]

I agree, if the machines are the same, it would have to be the default parameters are different for retract amount etc..

[stevo1]

I'm with Under on this one. If it is the same structure of a canned cycle typeI or typeII then it would have to be the parameter settings that are related to the canned cycles probably more specific to the retract amounts.

Speaking outside of my expertise I would also have to imagine that depending on the servos, how they are tuned, and the specific machine specs will also play in on this. One would think that a Oitd on a brand new shiny lathe would be much faster then a Oitc on 10yr old lathe would be much faster even if the canned cycle parameters are the same. So are we comparing apples to apples............same make, model, year, stroke machine??

Stevo

[ALEXCOMO]

Retract amount is the same, servo settings and acc/dec are more faster on 0itd, i'm going to take a video of the same program runnet on the two machine.
0itc 1min 32sec
0itd 1min 48sec
0itd is going to make aircutting!!!
I play with parameters but there is no way.
the algorith are quite different

[angelw]

Retract amount is the same, servo settings and acc/dec are more faster on 0itd, i'm going to take a video of the same program runnet on the two machine.
0itc 1min 32sec
0itd 1min 48sec
0itd is going to make aircutting!!!
I play with parameters but there is no way.
the algorith are quite different

There are quite a few versions of G71, both in Type I and Type II. I have seen one version on a Takasawa Lathe with a Series 10 control that when G71 Type I was activated, it performed a combination of Type I and Type II. In Type I is was able to cut profiles containing non monotonous X moves without error, or wrecking the part, but it left steps on tapered surfaces, as does Type I normally, before taking a final pass leaving the specified finish allowances, if any.

Regards,

Bill

[ALEXCOMO]

Make some sample this morning.
is the algorithm....
in 0id the tool cut first the part without consider cavity, the cut
first cavity then go to another cave in feed re cutting the surface between!!!!
in oic if the tool find cavity go immediatly down in her

[FANUCCNC]

It is probably because the 0i-TD performs a rough cut of the finished shape by default. This behavior can be controled by parameter 5105. Set 5105#1 and 5105#2 both to "1" if you don't want the roughing cut.

See the highlights in the attached documentation.

[ALEXCOMO]

thank you FANUCCNC,
I put the Par 5105 RF2 to 1 three weeks ago (for type 1 macro I haven't any problem).
How can I post the semple videos, youtube Link?
Do you think it's better for me going to use manualguide??? but I think is slow in programming.Do you think manual guide code can put writing directly???

[fordav11]

use youtube for videos

a long-hand program will always be faster than a program using cycles providing it is
written correctly because you have absolute control over tool movement at all times.

using conversational software is usually faster than manual programming but of course
you must learn to use the conversational software proficiently