[deadlykitten]

just goes to show how little you know at times...

my god, OSP5000 ? that's huge man !

I don't know how to G Code anymore. I'm trying to thread a 5/8-18 thread on CRS by 12 inches length of thread.

hello mr Jmooresshop ... G codes for 2 methods :
.... flank compound infeed @ 2.5 degress ( OSUB1 )
.... zig zag @ 55 degress ( OSUB2 )

i discovered today that i do have documentation for UN threads
for this UNF 5/8 was also specified a 1:43 angle [ degrees : minutes ]; i don't know what this means ... anybody ?
more precise, i found this :
... unc 5/8 - 2:56
... unf 5/8 - 1:43
... unef 5/8 - 1:16

this code is for a straight thread
it covers most machining aspects of a thread; also, it goes where & how you wish
i did not put specific data into it, so it should require x_offset corrections
well, all cnc's require offset corrections ... this story is for another time

OS00
( cnc unit : millimeters                         )
( insert   : partial profile , r0.06 ap 1.01     )

    V1 = ...            ( n )
    V2 = 25.4/18        ( f )
    V3 = 5/8*25.4       ( external diameter )
    V6 =-12*25.4        ( thread end point  )
    V11= 1.5            ( ...    start ...  )

     ( * )
 
    V4=0  ( nominal tolerance               )
    V5=0  ( coeficient for V4               )
    V9=0  ( minimal play                    )
    V7=0  ( ap - c for full profile inserts )
    V12=0 ( cutting depth                   )

    V3=V3-V9-V4*V5+2*V7 ( reference diameter )

  ( IF [ VRSTT NE 0 ] NEND )

  ( M867 )
    G00 X375-VETFX Z-VETFZ
    T060606 ( M66 )
    G00 X+V3+5 Z+V11 ( M63 )

    G97 S=V1 M42 M03 M08

    CALL OSUB1      ( flank compound infeed @ 2.5 degress )
  ( CALL OSUB2 )    ( zig zag               @ 55  degress )

    G00 X375-VETFX Z-VETFZ ( M203 )

  ( NEND )

RTS

 ( . . . . . . . . . . . . . . . )

OSUB1

    CALL OQ00 V10=0.520  V8=0
    CALL OQ00 V10=0.417  V8=20
    CALL OQ00 V10=0.323  V8=18
    CALL OQ00 V10=0.240  V8=16
    CALL OQ00 V10=0.167  V8=14
    CALL OQ00 V10=0.104  V8=12
    CALL OQ00 V10=0.063  V8=8
    CALL OQ00 V10=0.021  V8=8
    CALL OQ00 V10=0      V8=5

RTS

 ( . . . . . . . . . . . . . . . )

OSUB2

    CALL OQ00 V10=-0.057 V8=0
    CALL OQ00 V10=+0.047 V8=20
    CALL OQ00 V10=-0.047 V8=18
    CALL OQ00 V10=+0.036 V8=16
    CALL OQ00 V10=-0.036 V8=14
    CALL OQ00 V10=+0.026 V8=12
    CALL OQ00 V10=-0.016 V8=8
    CALL OQ00 V10=+0.026 V8=8
    CALL OQ00 V10=0      V8=5

RTS

 ( . . . . . . . . . . . . . . . )

OQ00

    V12=V12+V8/100
    G00 X+V3+5        Z+V11+V10
    G33 X+V3-2*V12    Z+V6      F=V2 G95

RTS

[deadlykitten]

Controllers of the OSP5000 series did not come with electronic manuals. Whilst they might be now available (usually for a steep price as well) I do not have them for that controller. Also, it should be noted that the basic programming methods for current controllers are very little changed from the 5000 series, so I suppose I could have extracted the relevant sheets that way.

cnc+programing does not bring something new ... it just allows for consacrated metal cutting operations to be delivered faster and more reliable

so, why not consider a wood lathe powered by water, and carve instrunctions into stone plates ?

i was just trying to be nice broby, i offered to give you my manuals ... how would i know about osp5000 ?

If an answer can be give by scanning in and posting then why not? Better than not being helpful.

the issues in this thread won't be solved by G codes ... i wrote them because mr. Jmooresshop asked for it, but also i wrote all those stability details, that are more important

the best answer in this thread was from kevin0296 ... all other replies are just " exchange of experience "

[deadlykitten]

I'm trying to thread a 5/8-18 thread on CRS by 12 inches length of thread

hello

.... to drastically reduce cutting force, consider image 1; normally, this is not recomended, because will accelerate tool wear, but since your inserts don't last long, maybe will work for you

.... to eliminate buckling, consider :
........ image 2 : a support pipe, tighten between tailstock and chuck; this solution requires thrust from your tailstock, so more trust is needed, to achieve same pushing force for the live center; your part does not require a lot of thrust, so there should be enough left to tighten that pipe; 1st you push the tailtock, and after you tigten the pipe; at the other end, it stays on a bearing
........ image 3 : a suport frame, solidary with tailstock chassis, or how is it called; is simpler, but requires tailstock chassis modification ... kindly !

[Voss_Machine]

On my mid 1990's Cadet...for an 18 TPI , I wold use F=1 and J=18

[OkumaWiz]

Yes that is correct.

[broby]

Yes that is correct.

But only on a machine configured in Imperial mode.
On Metric machines the equivalent is F25.4 J18

[OkumaWiz]

OK Aussie, that is right in the land down under...but he did say TPI as in Thread per Inch. ;-)

[broby]

OK Aussie, that is right in the land down under...but he did say TPI as in Thread per Inch. ;-)

ha ha, well... if you were programming on a metric machine and you used F1 J18 then you would get a mighty fine thread
Just thought I would point out that there is a difference between measurement systems.

[deadlykitten]

nice, again focus on G codes this one saves the day, especially on last pass ( if it gets there )

G00 X~dia Z+clearance
G71 X+dia Z-20*dia A... B... C... D... :)

[deadlykitten]

threading long stuff without a following steadyrest :

use the turret to sustain the bar with a reduction sleeve; on Z+ you should have ~30...50 mm bar out, so to begin threading it by hand ( using a thread die ), so to have the thread start ( 1st drawing from bottom )

if you consider, clamp the tailstock

continue threading, by feeding the turret and selecting a comfortable rpm

at this moment, threading tool may be :
... in your hands ( 2nd drawing from bottom )
... in a special sleeve ( 3rd drawing from bottom )

this should get you close to the chuck without worries

---

you may set up a turning knife in the same way

use G33, and stop the machine before it reaches max travel

setup the knife with a comparator

this requires a minimal play between the bar and the sleeve ( or whatever sustaining element )

this involves more work than using a thread die, but you may use this setup to rough the thread, and finish with the die

[deadlykitten]

who is this in english ? true tap love ? tap mothership ? tap egg ?

[broby]

who is this in english ? true tap love ? tap mothership ?

It is a thread Die. the one in the picture is for an M20 thread.
This die is a fixed size, non-adjustable one.

[deadlykitten]

thank you