switch to manual mode to jog

On 1/16/2016 11:23 AM, Niemand Sonst wrote:
> I do not want to jog in Auto mode, but why not in MDI Mode?
>
> I do agree, that jogging during a machine movement is not a good idea.
> But in MDI MOde the machine is very often in the idle state and jogging
> should be allowed.
>
> There could be a status check for machine is idle to allow jogging.
>
> Norbert
>
> Am 16.01.2016 um 18:03 schrieb John Kasunich:
>> On Sat, Jan 16, 2016, at 10:15 AM, Marius Liebenberg wrote:
>>> I have to agree with that. It is most irritating to have to switch to
>>> manual if you want to jog and that for no apparent reason.
>>>
>>>
>>>> Hy to all,
>>>>
>>>> I am pretty sure it has been discused allredy, but I do not remember
>>>> the
>>>> reason, why jogging is not allowed in MDI mode.
>>>>
>>>> I do not see any reason, why to keep that limitation.
>>>>
>>>> Norbert
>> There are technical reasons.  In Manual mode, the g-code interpreter
>> is not active and neither knows nor cares where the machine is.
>>
>> In Auto mode (running a program or MDI), the g-code interpreter is
>> both active and in control of the machine.  The interpreter knows
>> where the machine is (or more precisely, where it will be when it
>> finishes executing any queued moves).
>>
>> The transition from manual to auto is used to pre-set the interpreter's
>> state so that it knows where it is starting from.  If a jog was allowed
>> during auto, the interpreter would be unaware that the machine had
>> moved.  Any subsequent MDI commands would be wrong.
>>
>> Also, allowing jogs during auto mode would mean that an accidental
>> button press during a program or an MDI move could damage the
>> part.  When in auto, g-code from a program or the keyboard is in
>> total control of the machine, and I would argue that is a good thing.
>>
>> John Kasunich
>>
>>
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