Re: [CAD_CAM_EDM_DRO] G81

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@... 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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