Re: G81

--- In CAD_CAM_EDM_DRO@y..., "Rich D." <cmsteam@a...> wrote:

in this example
N200 G81 R.50 Z-5
x and y were most likely given in the previous block like
n100 Go X5.Y10.
N200 G81 R.50 Z-5
F would carry from a previous block
n200 G81 X5. Y10. Z-5. R.50 F5.0 would be the same thing done in one
block of data.
a series of holes could be done like this
n200 G81 X5. Y10. Z-5. R.50 F5.0
n300 X10. Y2.
n400 Y.5
and so on
must be cancaeled with G80













> Ed,
> G81 is a command to do a pattern of holes or spots, etc.
> You must have 2 or more coordinate positions to make it useful.
> Your example gives only one position (x0.4 Y0.2 Z-0.3).
> The program setup allows you to set the drill tip clearance above
> the work to move between positions (R0.1) and the down feed rate
> for the Z axis (F10). These are inches (or mm) per minute.
> F10 is way to much for a drill of any size in inches.
> Drill depth (Z-0.3) is the amount to drill below the Z0.0 position
> which normally will be the surface of the work that you touch
> the drill to in your setup to zero the Z axis.
> BTW, a G81 pattern must be completed by a line with G80 to cancel
> the G81 as this is a modal command. (stays in effect until canceled)
> Not doing so will give odd results.
> RichD
>
> edwardhall@s... wrote:
> >
> > Hi,
> >
> > Tried the drill tutorial in Deskam and wondering if others on the
> > list are familiar with the drill tutorial?
> >
> > What is G81?
> >
> > If one is using a 5/16" drillbit, what does a command like the one
> > below does?
> >
> > N100 G81 x0.4 Y0.2 Z-0.3 R0.1 F10
> >
> > The parameters given were
> >
> > Tool : 5/16" drill bit
> > drill depth: 0.373
> > rapid ht. : 0.1
> > Tool dia. :
> >
> > The input for the tool diameter appear to be irrelevant as
> > irrespective of whatever one input for the tool diameter, the
above
> > remains ....R0.1
> >
> > What is the significance of R0.1?
> >
> > Or other examples (not from Deskam) like
> >
> > N200 G81 R.50 Z-5
> >
> > N300 G81 V1=5 V2=-7
> >
> > What does these figures mean
> >
> > Thanks
> >
> > Ed
> >
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