Lathe Thread

[Columbo™]

I am getting odd results after posting a 1.25-12 UNJF thread with modified major diameter 1.262/1.252.

 

Is this something new with modified major diameters.

 

Does the X have to be modified? (or leave it for comp.)

 

How does it effect the "H"?

 

 

(1.250-12 UNJF THREAD)

N540 G00 X30. Z80.

N550 G97 S500 M03 M42 T0505

N560 G00 X.9598 Z.2233 M08

N570 G71 X1.25 Z-2.1 D.006 H.0902 F.0833

N580 G00 X30. Z80. M05

N590 M02

[Hymen]

First if you are threading you need G76 output.

I say put you X in the G76 line in the middle of your tolerance then work up with offsets. But keep in mind that as you move comp +X your first past amount may grow with it.

 

It would appear this is a internal thread as the 1st X value is smaller than the one in G71(G76)?

 

Larger major mean more material to be removed if in fact the minor stays the same. So in turn your H value will be greater. H is the amount of stock to be removed so....

 

Posted for a Haas controller right?

[Columbo™]

No, it's an Okuma control (OSP-E100L)

[Hymen]

Got this figured out?

Sorry I couldn't help.

[Columbo™]

Yes thanks got it.

 

cheers