
Turning Operations
Chapter 18
18-15
The format for the G33 thread grinding operation is:
Parallel thread G33Z__ F__ Q__;
E
Tapered thread G33X__Z__ F__ Q__;
E
Face thread G33X__ F__ Q__;
E
Where: Is :
X the end point of thethread grindingmove in theX-axis. This parametercan be
an incremental or absoluteandradiusor diametervalue. Ifnot presentthere
mustbe a Z parameter. Ifan X parameterispresent,it indicateseither a face,
tapered,orlead-inthread. When used in a G33 block withouta Z parameter,a
facingthreadismade parallel totheX-axisat theZ-axispositionpriorto theG33
block. Xvaluescan be enteredasa radius or a diametervalue. X can alsobe
programmed as an incrementalor absolutevalue. The initial
minordiameterof
anystraightor taperedthread isdeterminedbythe positionof theX-axispriorto
theG 33 block.
Z the end point of thethread grindingmove in theZ-axis. This parameter can be
an incremental or absolutevalue. Ifnot presenttheremustbe an X parameter.
When using a Z parameterin a G33 block withoutan X parameter the threading
passis made parallel totheZ-axis atwhateverXposition thegrindingwheel
edge wasatprior totheG33 block. Z parameteris alwaysentered as a radius
valuesregardlessofthe currentmode.
EF
This parameter may be enteredby using eitheran E- or F-word. Itrepresentsthe
threadlead along the axiswith thelargestprogrammed distanceto travel to
makethe threadcut. Itismandatorywhen cuttinganythreads.
IftheE-word isprogrammed, itsvalue (signignored)is equal to thenumberof
threadsper inchorinchesper thread(determinedinAMP)regardlessofwhether
inchormetricmode is active at thetime.
IftheF-wordis programmed,itsvalue (sign ignored)is the threadlead in inches
perrevolution or millimetersperrevolution,depending on the modeinwhichthe
control isoperating.
Q anoptional parameterthatprovides a relative value forthestartoffsetangleof
thethread. Itsprimaryuse is in grinding multi-startthreads. For example,if a
threadingpass weremadewith a value ofzero here,andthenfollowed by
anotherpass withavalueof 180 thenthesecond passi s started 180 degrees
fromthefirstresultingin a two startthread. Iftwo morepassesarethenmade,
one witha parametervalue of 90 and one withavalueof 270,theresultwould
be a fourstartthread.
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