Re: [CAD_CAM_EDM_DRO] Re: virtual hand jive

This certainly has gotten to be an involved thread. I was watching a show
on TV last night about modern warfare technology and a very interesting
point was brought up. I wonder if anyone has considered this:

Just suppose you've got a job simple all set up on your machine and it HAS
to be out today. You jog to point "A", make a quickie cut, jog over to
point "B", make another cut, and then jog to point "C". In the midst of
jogging to point "C" the jog button quits working. Thanks to relying on
modern technology, you don't have any hand wheels on the machine. What do
you do now?

It's ALWAYS a good idea to remember old man Murphy and his famous law..."If
something can go wrong, it will...and always at the most inopportune time.".
Plan ahead, build in detachable hand wheels. Even if you hate hand wheels,
at least then you'll have something to fall back on in an emergency.

Smoke


-----Original Message-----
From: Ian Wright <Ian@...>
To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
Date: Tuesday, November 07, 2000 1:09 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: virtual hand jive

>Hi,
>
>I suspect that the answer here could be that pressing buttons could be
>a:) less precise than handwheels as it may be deemed easier to overshoot...
>b:) more frustrating as any overshoot would have to be corrected which,
>depending on the delay between pressing the button and the machine
>responding, could require several attempts to get the position absolutely
>correct and
>c:) frustrating in waiting for a move to be completed as the movement of

the

>machine would be dependent on the 'repeat speed' of the control button.

This

>would have to be set at a level which would take into account the delay
>between pressing the button and the machine moving.
>
>Personally, I also would not favour 'electronic' handwheels for similar
>reasons although they would be preferable to buttons as the operator has
>more control over speed of movement and more of a feeling of actual control
>by the angle of rotation of the wheel.
>
>While I admit to little contact with cnc machines so far - really only
>limited to a few weeks messing about in a military aircraft factory - I
>would definitely favour retention of the facility to move the table about
>mechanically. I don't see the handwheels being a safety issue as they could
>be of the type on (or rather not on) my antique miller which are removable
>and fit on a square on the end of the leadscrews (actually the 'handwheels'
>here take the form of one large crank handle which is often mislaid and is
>usually replaced by a 1/2" drive ratchet handle!). I assume that, if the
>power is removed from the stepper or servo system, the tables would be free
>to move using a mechanical handwheel?
>
>Ian
>--
>Ian W. Wright
>Sheffield UK
>www.iw63.freeserve.co.uk
>----- Original Message -----
>From: <ballendo@...>
>To: <CAD_CAM_EDM_DRO@egroups.com>
>Sent: 07 November 2000 01:56
>Subject: [CAD_CAM_EDM_DRO] Re: virtual hand jive
>
>
>> Boy!
>>
>> There sure are a lot of people who feel the need...
>> The need for... Handwheels...?! I want Rotation, NOT pressure. I
>> NEED rotation; pressure is just so... Pushy!
>>
>> I remember growing up and turning the crank to move the car window up
>> and down. Now I just press a button. When it gets to where the "wind
>> in my face" is correct, I stop pushin'. Simple. Effective.
>>
>> Which is more intuitive ???
>>
>> I also used to set the kitchen timer by ROTATING a "certain" amount.
>> Now I press buttons.
>>
>> Which is more precise ???
>>
>> I used to "turn" the TV volume up and down. Now I press buttons.
>>
>> Which is more "correct"???
>>
>> I used to turn the handwheels of machine tools. Still do, sometimes.
>> But now I can do the same thing(s) by pushing buttons. And I don't
>> have to write (or re-write) any software to do it!
>>
>> The ONLY really valid point raised, IMO, in the press vs. rotate
>> question is that the RATE of rotation can be controlled WHILE
>> the "start/stop" of rotation is being controlled. With one hand.
>>
>> I need 2 hands/fingers to do this now (1 for F/R, 1 for position).
>>
>> So how about a "pressure-sensitive" switch. Like a Wacom digipad (CAD
>> input device, press harder for wider/darker lines) This would be
>> similar to "pushin on the gas pedal" when driving.
>>
>> Intuitive!?
>>
>> Ballendo (playin' devils' advocate)
>>
>>
>>
>>
>>
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>>
>>
>
>
>Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the

discussion of shop built systems, for CAD, CAM, EDM, and DRO.

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