I have continued this subject in its own thread, because I also 
think that Andy's proposal is a good one, for the reason that 
it would make it very easy to make minor adjustments by 
using the built-in math functions: 

                 (user starts touch-off dialog)
12.3456          (appears in touch-off dialog)
12.3456 - 0.001  (user makes minor adjustment w/ math)
12.3446          (after user clicks "accept" or whatever)
                 (user clicks "done" and dialog closes)

The tool table editor could also use something like this, for 
the benefit of those who use "east coast" (part outline) gcode 
programming, using non-zero diameter entries. [This is 
as opposed to "west coast" (tool path) gcode programming, where 
all the diameter entries in the tool table are either zero or 
are very close to zero.] 

Alternatively, I have worked with controls that accept 
"/-.001" as meaning "adjust current diameter down by .001." 
The leading slash signifies the differential (relative) form 
of adjustment. This would work equally well on lengths and 
offsets as well as diameters. 

If "slash" is already taken as "divide by", that's fine, 
then the math must be working and we can use plus and minus. 
If not, then perhaps some other unused character can be 
selected for this purpose, or maybe a new entry box is needed. 
I'll refrain from commenting on the specific implementation. 

Anyway, good idea Andy, I add my +1 also. 
Further comments, anyone? 

Kim


On 05/07/2012 06:57 PM, gene heskett wrote:
> I know I'm the trigger for this, but I'll sure put a +1 on this.
> 
> On Monday, May 07, 2012 07:56:47 PM andy pugh did opine:
>> Having considered this during a long and tedious ride down the A1, I
>> am persuaded that there is no reason that the touch-off dialog
>> shouldn't default to the current value.
>> Does anyone else have an opinion?
>> 
>> On 7 May 2012 15:16, gene heskett <[email protected]> wrote:
>>> because
>>> Touch Off doesn't display the current setting, but defaults to 0.0.
>>> That of course makes it easy to cancel a Touch Off, but I find in my
>>> usage, I need to just edit it another thou or so.
>>>


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