Re: [CAD_CAM_EDM_DRO] Re: Digitizer probe progress

Yo Graham;

Now you got me confused. Up till now I had thought the probe was for some sort
of, "hunt and peck", setup to make some kind of computerized topological map of
a workpiece prior to machining, or nachine duplication. So instead it works
like a CNC'd electronic wiggler?

Bill

On Fri Sep 26 02:55:39 2003 Graham Stabler wrote:

>OK, the probe itself is screwed into a hub and from this hub protrude
>three metal arms. These arms are insulated electrically. Each arm
>sits between two bearings and hence makes an electrical connection
>between them. The PCB clamps down onto the balls, holding them in
>place and also making an electrical connection to them. There are
>two wires from the probe one connects to one part of the pcb which
>goes to just one of the balls, the current goes from the pcb to ball
>to rod to ball ... until it leaves by the other wire.
>
>i.e.
>
>Wire
>pcb
>ball-rod-ball
>pcb
>ball-rod-ball
>pcb
>ball-rod-ball
>pcb
>wire
>
>So if the probe tilts in any direction or is pushed up then the
>circuit is broken and the computer knows to stop moving. The hub is
>held against the contacts using a spring BTW.
>
>I have uploaded pics of results now, see my other post.
>
>Graham
>
>
>
>
>
>
>
>
>
>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Wayne C. Gramlich"
><Yahoo@G...> wrote:
>> Graham:
>>
>> Every time I've looked at the digitizer.pdf file, I wind
>> shaking my head and saying "I don't get it!" I guess some
>> sort of electrical circuit is supposed to be made or broken,
>> but I can't figure out how the circuit is supposed to operate.
>> Could you explain where the wires are supposed to go, and
>> what causes the circuit to be completed/broken? Am I correct
>> in assuming that the goal of this digitizer probe is to
>> detect any deflection in X and Y and deflection in one
>> direction on Z? Any edification would be greatly appreciated.
>>
>> Thanks in advance,
>>
>> -Wayne
>>
>> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Graham Stabler"
><eexgs@n...>
>> wrote:
>> > Just a quick post to say that I have my digitizer probe working.
>It
>> > is based on the one in the files section drawn by Carlos
>Guillermo.
>> > The file is digitizer.pdf.
>> >
>> > Based on this I built the digitizer out of Delrin on my little
>> > Proxxon mill. I had been looking for 2mm ball bearings for the
>> > pivots and eventually got these from smallparts.com (shame about
>the
>> > $25 postage, grrr). The probe works really well although I am
>> > disappointed that I did not manage to get the probe part
>concentric
>> > with the shaft that is held by the mill collet. This means it is
>> > only good for digitizing rather than edge finding etc. I may
>rectify
>> > this in the future and it was a function of my workmanship rather
>> > than the design.
>>
>> [snip]
>
>
>Addresses:
>FAQ: http://www.ktmarketing.com/faq.html
>FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
>Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
>Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
>List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@..., timg@...
>Moderator: pentam@... indigo_red@... [Moderators]
>URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
>OFF Topic POSTS: General Machining
>If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble.
>http://www.metalworking.com/news_servers.html
>
>http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
>
>NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
>bill
>List Mom
>List Owner
>
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>

--
----------------------------------------------------------------------------
RKBA! ***** Blessings On Thee, Oh Israel! ***** 4-19!
----------------+----------+--------------------------+---------------------
An _EFFECTIVE_ | Insured | All matter is vibration. | Let he who hath no
weapon in every | by COLT; | -- Max Planck | weapon sell his
hand = Freedom | DIAL | In the beginning was the | garment and buy a
on every side! | 1911-A1. | word. -- The Bible | sword.--Jesus Christ
----------------+----------+--------------------------+---------------------

Constitutional Government is dead; LONG LIVE THE CONSTITUTION!!!!!

----------------------------------------------------------------------------