Re: [CAD_CAM_EDM_DRO] Re: OK, I've got a detent encoder... Hello?

Hi Sean:
If they all have 100 increments per turn then they need to have 100
increment encoders on them (if I understand correctly)
Somewhere back in this thread I believe I heard the comment that 100
increment encoders are expensive oddballs.
My comments were, that as a user, I don't care whether there are 100
increments per turn or 180 or 36.
In lots of years of machining it's never mattered even once for me.

So, by inference, a standard cheapjack encoder for the budget conscious
should be just ducky for the job of a jogwheel so long as the software makes
it move an even increment for each slot in the encoder.
Remember, I'm talking now about cobbling together a homebrew system, not
retrofitting an existing control that already has a 100 increment encoder on
it.

Purely for convenience, the increment is nice to have at decimal fractions
of an inch, but only when you use it as I have described in a previous post.
When you want to know where you are, you look at the display; you don't need
to count handwheel rotations.
Cheers

Marcus

----- Original Message -----
From: "audiomaker2000" <audiomaker@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, February 17, 2002 3:50 PM
Subject: [CAD_CAM_EDM_DRO] Re: OK, I've got a detent encoder... Hello?


> Um...is anyone listening here?
>
> There are reasons why "real" CNC machines have certain standard jog
> increments attached to the jog wheel.
>
> They are...
>
> ..01
> ..001
> ..0001
>
> At .01 per detent you can move the table quite quickly...even too
> quickly.
> Once you get close, you switch to .001, and if your machine is
> capable, you can go .0001 when you are really on it.
>
> Sure, you could make a program do 26 feet per increment, but it's
> really dangerous and so most don't even give that option. They also
> don't give the option to type your own in case you forget a decimal
> place..or get stupid and type in something dangerous.
> The 3 standard increments are also set 10X apart for easy
> calculations so you don't screw up by trying to calulate things
> like .875 X increment to get where you are going.
> Jog wheels ALL have 100 increments (or 99 if you like).
>
> Remember, this is a *jog* wheel we are talking about here. It is used
> for setting up the work and the machine, not for machining. It is not
> a substitute for a "hand wheel".
>
> A "hand wheel" would have no increments or detents, and could easily
> be made with a mouse encoder. A hand wheel (or "handwheel") is
> controlled by the feedrate, which a "jog wheel" is not. One is not a
> substitute for the other. Although they look similar, and both move
> the axes, they are completely different.
>
> :-)
> Sean