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)
>
>
>
>
>
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
discussion of shop built systems, for CAD, CAM, EDM, and DRO.
>
> Addresses:
> Post message: CAD_CAM_EDM_DRO@egroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@egroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@egroups.com
> List owner: CAD_CAM_EDM_DRO-owner@egroups.com, wanliker@...
> Moderator: jmelson@... [Moderator]
> URL to this page: http://www.egroups.com/group/CAD_CAM_EDM_DRO
> FAQ: http://www.ktmarketing.com/faq.html
> bill,
> List Manager
>
>