Need help on some Fanuc 0T lathe code

[DEAN-O]

Hello everybody!

I'm new to lathe programming and was hoping someone could point me in the right direction on the G-code for this. I'm using a Fanuc 0T on a Daewoo. Basically the part looks like a giant trailer hitch ball. What would the code look like, what would be the ideal tool, and would there have to be a tool change. I've got the easy end figured out and done, just need to flip it around and do the ball end now.

Thanks

[timlkallam]

Yep thats 2 tool job I would use right and left hand tool with vbmt 332 inserts.

http://desc.shop.ebay.com/i.html?_nk...t=11804&_rdc=1

[tobyaxis]

Originally Posted by DEAN-O Hello everybody! I'm new to lathe programming and was hoping someone could point me in the right direction on the G-code for this. I'm using a Fanuc 0T on a Daewoo. Basically the part looks like a giant trailer hitch ball. What would the code look like, what would be the ideal tool, and would there have to be a tool change. I've got the easy end figured out and done, just need to flip it around and do the ball end now. Thanks

Dean your going to have to start with the first 90 degrees of the Radius on the Ball.

Then Rough the Neck where the Ball meets the back side of the radius all the way to the flange.

To write code without dimensions is a bit difficult, so do you have a print that we can see?? Also, what is the Material and How Old is the Machine.

If you have a Full Radius Groove Turn you can do the whole thing. If not you will need 2 Tools, possibly 3.

1 Front Turn
1 Groove
1 Back Turn

You'll have to watch your DOC's and F&S if you only have one of each. If you have 2 of each Rough with one set then Finish with the other.
Watch your Blends on the Full Radius, Groove, and Back Turn.

Do you have any experience programming a G-Code Mill or is this your first time Programming??

[DEAN-O]

The material is 4140. I wrote the program below and ran it in mid-air but it didn't work quite right. It roughed the end of the ball and then profiled the entire piece without roughing the back side.

%
O7780
N1T0202
G50 S1500
G96 S1000 M03
G00 X5.1 Z.25
M08
G01 Z0. F.01
X0.
G00 W.1
X5.1
G71 U.05 R.15
G71 P10 Q110 U.02 W.02 F.012
N10 G42 G00 X1.925
N20 G01 Z0.
N30 G03 X3.99 Z-1.7475 R1.995
N40 G03 X2.875 Z-3.131 R1.995
N50 G01 X2.875 Z-3.55
N60 G02 X3.375 Z-4.05 R.5
N70 G01 X4.935 Z-4.05
N80 G01 X4.975 Z-4.09
N90 G01 X4.975 Z-4.39
N100 G00 G40 X5.1
N110 G00 X5.5 Z.25
G70 P10 Q110 F.006
M09
G00 G28 U0.
G00 G28 W0.
M30
%

To answer your question Toby, I have some basic mill programming experience but really not much on the lathe. The lathe that I am using is probably mid to late 80's

Here is a picture of the tool I plan to use and also a crude print.

Thanks for your help!!

Dean

[leggazoid]

You need G71 type II to do the ball in one shot. If you have that option you could add a Z # in line N10. I have a couple of suggestions about your program. The W.02 in the G71 will cut too much off the backside of the ball. G42 works so much better on the G70 line then just add G40 on the next line. With cutter comp. I would recommend starting X- twice the radius of the insert(X1.925-.0313=1.8937 or smaller then feed to X1.925 in line N20). G71 type I does not allow non-monotonous movements in X.


%
O7780(TYPE II EXAMPLE PROGRAM)
T202
G50 S1500
G96 S1000 M3
G0 X5.3 Z.1 M8
G94 X0 Z0 F.01
G0 X5.1 Z.1
G71 U.05 R.15
G71 P10 Q20 U.02 W0 F.012
N10 G0 X1.83 Z.1
G1 X1.925 Z0 F.006
G3 X2.875 Z-3.131 R1.995
G1 Z-4.05 R-.5
X4.935
X4.975 Z-4.09
Z-4.39
N20 X5.1
G70 G42 P10 Q20
G0 G40 G28 U0 W0 M9
M30
%


http://www.cnczone.com/forums/archiv...p/t-49785.html

There are a couple of ways to approach this with multiple repetitive cutting cycle type I by breaking it up into a few operations. The backside of the ball would need grooved out for clearance from Z-3.133 to 3.55 first.

Hope that helps.
Ken

[DEAN-O]

Thanks for your reply Ken. I tried it like you said but my machine doesn't like the Z value on the N10 line. I may have to resort to an alternate plan as you said with grooving out behind the ball. If anyone has any other suggestions please advise.

Thanks,

Dean