Re: [CAD_CAM_EDM_DRO] DRO stuff

Hi,

This question of resolution can be increased by using a rotary encoder and cable return sping from a vacuum cleaner or windup clock main spring. A drum is connected to the encoder and fine stainless cable/wire hooked up to the slide of the machine. The wire is kept under tension by the spring. It is posible to obtain 2000 line per rev on the encoder x 4 which is 8000 lines per rev. The hard part is paying out the wire in a uniform way so that too much error doesn't creep in. This has all been done. If I can find the web page where I saw it I'll post it.

Terry.

----- Original Message -----
From: D.F.S.
To: CAD_CAM_EDM_DRO@onelist.com
Sent: Monday, March 13, 2000 5:24 PM
Subject: Re: [CAD_CAM_EDM_DRO] DRO stuff


From: "D.F.S." <dfs@...>

>
> From: Par Willen <pwillen@...>
>
>
> Elliot Burke wrote...
>
> > The HEDS-9XXX encoder optics are set up for a specific grating pitch, so
> > using them with a higher pitch won't work. They contain multiple very
> > narrow detectors connected to each amplifier. With a different pitch they
> > won't all be in phase, hence lower output. There is some chance that a 360
> > x 3 = 1080 lines/inch there might be some output, maybe not enough to work
> > the electronics.
>
> First: This list and r.c.m is literallly a gold mine in time and money
> saving for us newbies, thanks to all ye contributors.
>
> Second: Aha! (And if I had put my brain in gear before posting I
> should've figured that out just by reading the ordering information on
> US Digitals website, the resolution is specific to the module...)
>
> OK, moving on: Is there any technical reason why you use the "3" as a
> multiplier in your example above? I would be very happy indeed to get a
> resolution of 360 x 2 if the quadrature works with that. And if so, has
> anybody seen any 720 lpi strips? : )
>
I forget exactly what was in my original post, and what was in the second
and shorter replacement.

Sorry if this is redundant.

Are you aware the output is 4 Times the number of lines/inch?

What actual reolution do you need?

Work back from there.

Marc


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