newbie with boring problem

[bobo17]

we just picked up an "91 fadal vmc4020 from an auction. i don't have any tech support but ya'll and am trying to figure out the basics on my on.
the machine is in format 1, would 2 be better?
what should the code look like for boring an 8.75 diam. hole in a 1.25 thick hub using a .75 rghn endmill at 26 ipm 1000 rpm. going .25 deep first pass then .3 deep for 4 more passes clearance at .05 above part. I'm using the mill bore cycle and the g91 has me all messed up.

any help appreciated.

[DareBee]

I believe that the biggest issue is that a boring cycle is something that you do with a boring head. Using an endmill to machine a bore is called circular interpolation and is often done using a hole pocketing routine.

Sorry, I don't have time to write your code for you.

[Neal]

BOBO17--
I disagree that you don't have Tech Support. You can call your local Fadal Dealer for support or you are always welcome to call here to the factory for support. Our Programming support number is 818 727-2100 option #3. We are not able to write your program for you but we will answer your questions and if needed review what you have written and make suggestions for you.

Neal

[denmar]

L100 *SUBROUTINE
G91Z-.250*FEEDS DOWN EACH TIME
L9801R0+20.R1+.01R2+8.75(CIRCULAR POCKET CYCLE
M17(END OF SUB
M30(END OF ALL SUBS
*STARTS MAIN PROGRAM*
G0G90S1200M3X0Y0E1
H1D1Z0
L1011(CALCULATE HOW MANY TIMES AND CHANGE
G0Z0M5M9
G28
M2
L9801=CCW
R0+20.=FEED RATE
R1+0.01= RADIUS OF TOOL
R2+8.75=DIAM OF BORE

[SBC Cycle]

The basic format for mill boring is pretty simple using the fixed subs L98XX(CCW) and L99XX(CW)

L98(number of times to run the cycle)
R0+(feed rate)
R1+(corner radius on tool)
R2+(diameter of the hole)

For your example it would be something like this:

G1 Z-0.25 F10.
L9801 R0+26. R1+0.1875 R2+8.7(leaving room for a finish)
G1 Z-.3 F10.
L9801 R0+26. R1+0.1875 R2+8.7
etc.

Couple of notes. You must call a diameter before you call the sub. The control uses the diameter for the obvious reason of making the right size hole AND to calculate the stepover. R1 controls your stepover. If you wanted to take the maximum cut using all of the tool diameter (not recommended) you would make this 0. If you wanted to take 0.375" at a pass using a 3/4" endmill, it would be R1+0.1875

[bobo17]

i appreciate the responses. i ended up copying and pasting 5 times to get it. i work out in the country and 100 miles from memphis. i'm trying to teach myself this format cause the owner doesn't think i could learn anything from a fadal programming class. i'd like to break my foot off in his a&^% sometimes. i consider ypou guy's the gurus and hope ya'll don't mind me kinda picking your brains a little. i taught myself how to program a milltronics, and nardini. i had 3 days training on a hyundai then didn't mess with it for 3 month's, boss thought i shoulda been able to remember it. haha. live and learn. thank's guys.