Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Instrukcja Użytkownika Strona 636

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Turning Operations
Chapter 18
18-20
Where: Is :
EF
This parameter may be enteredby using eitheran E- or F-word. Itrepresentsthe
threadlead along the axiswith thelargestprogrammed distancetotravelto make
thethread cut. Itis mandatorywhencuttingany threads.
IftheE-word isprogrammed, itsvalue (signignored)is equal to thenumberof
threadsper inchorinchesper thread(determinedin AMP)regardlessofwhether
inchormetricmode is active at thetime.
IftheF-wordi s programmed,itsvalue (signignored)is the threadlead in inches per
revoluti on or millimetersperrevolution,depending on the modeinwhichthe control
isoperating.
Ina G 34 block,Eor F indicatesthe initialthreadlead used atthestartof the
threadingpass.
Q an optionalparameter thatprovides a relative valuefor thestartoffset angle ofthe
thread. Its primaryuse is in grindingmulti-start threads. For example,if a threading
passwere made withavalueof zerohere,and then followedby another passwith a
valueof180 then thesecond passwouldstart180 degrees fromthefirstresultingin
a twostartthread. Iftwomore passesare then made,one with an a parameter
valueof90 and one with a value of270, theresultwould be a fourstartthread.
K thedifferencein the threadlead per spindle revolution (inch/rev/revor mm/rev/rev).
The amountof K isadded tothe threadlead (Eor F) aftereach threadi s ground. K
canbeprogrammed as a positive (increasing thread lead) oranegative (decreasing
threadlead) value.
The actions of the G34 variable lead threading operation is i dentical to the
G33 threading operation with the exception of the variable thread lead.
See the G33 threading section, beginning on page 18-14, for details and
examples of single pass threading blocks that grind parallel, tapered, or
face threads.
Metric and inch lead variation limits are indicated below:
+/- 0.0001 to +/- 100.0000 mm/rev
+/- 0.000001 to +/- 1.000000 inch/rev
Example 18.7
Variable Lead Face Threading Using G34
N1G00G07X57.Z37.5F100;
N2G91;
N3G34X-47.5F.1K.071;
N4G00Z10.;
N5X47.5;
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