Re: [CAD_CAM_EDM_DRO] Re: Rotary table DRO

Hi guys;

It would be pretty finicky to set up, but you could use two encoders, one ever
so sligthy offset from the other, and held in place with set screws or an
adjustable screw. With the proper additional circuitry, this would double your
resolution. Quit a while back, someone posted such circuitry, but it's been so
long, I can't recall who it was. If memory serves, it involves one or two 4
gate TTL or CMOS chips. I think they were Exclusive Nor chips, but don't quite
me on that. I had a pic of it, but I'm not sure if I still do, as I've had a
crash or two since then. I'll see if I can find it, unless someone beats me to
it.

Bill

On Mon May 12 04:14:06 2003 Andrew Mawson wrote:

>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "babinda01" <a_k@a...> wrote:
>>
>> Hello,
>>
>> I was wondering if someone may be able to help me with a problem
>I
>> have at the moment.
>> I am trying to add a DRO to my 'little' rotary table. It is 6
>meter
>> diameter. I am looking to get .05mm accuracy if at all possible.
>I
>> was thinking of puting a rotary encoder onto the main spindle which
>> is coupled directly to the table, but to get the resolution I am
>> looking for I need approx 400 000 pulses per rev (0.00095 deg).
>All
>> the encoders I have looked at seem to be about 8000 pulses per rev
>in
>> quad. Is it possible to gear an encoder up? If so how (so as to
>get
>> minimal backlash)?
>>
>> Thanks for your help
>> Andrew
>
>Look at: http://www.bwelectronics.co.uk/
>
>They have a dro application for a rotary table and it is transferable
>to other equipment
>
>Regards,
>
>Andrew Mawson,
>Bromley, Kent, UK

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