Re: [CAD_CAM_EDM_DRO] Re: Digitizing

Alan,
does it mean that you manually move axis around an object and record
number of pulses generated by the steppers?
Alex

Alan Marconett KM6VV wrote:

>Hi Alex,
>
>OK, I see your line of thought. And indeed, A/D converters are used to
>digitize pots.
>
>As far as the probes used in CNC and CM, I believe you'll find the
>equivalent of a switch in each of the 3 (or more) axis of movement.
>These systems rely on the position accuracy of the CNC system for the
>locations or offsets.
>
>Where an A/D could be useful is in reading a potentiometer, with a user
>set value, such as speed override, or any other value that might be
>read.
>
>A 144 Mhz (2 meter) digital radio that I built used an A/D channel to
>read the volume control as I recall.
>
>Alan KM6VV
>
>
>alex wrote:
>
>
>>Alan,
>>for audio analog reading of amplitude are being entered into A/D
>>converter and digital readings received 8,000 times per second.
>>I presume that your probe is being attached to the potentiometer which
>>generates analog voltage which in turn goes into
>>A to D converter. In this case it is quite similar to an audio.
>>Isn't it correct?
>>Alex
>>
>>Alan Marconett KM6VV wrote:
>>
>>
>>
>>>Hi Alex,
>>>
>>>Thanks for the offer, but we may be confusing digitizing sound with
>>>digitizing an object. In our use, a probe must be driven around or near
>>>an object, and the coordinates of points of contact recorded. Offhand I
>>>can't see where digitizing an audio stream would be similar.
>>>
>>>Alan KM6VV
>>>
>>>alex wrote:
>>>
>>>
>>>
>>>
>>>>About 10 years ago our consultant developed digitizing program in DOS
>>>>(for audio stream). They used serial
>>>>port timer in assembler and it worked great. If you need more info I
>>>>probably can find an original code.
>>>>Alex
>>>>
>>>>Alan Marconett KM6VV wrote:
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>Hi Graham,
>>>>>
>>>>>I'd like to see your 'C' source code, and I believe I can help you on
>>>>>the uS timing code (in C) as well. I use the the 8254 timer in a PC,
>>>>>just as Dave does in TurboCNC (Pascal). From and old paper on timing
>>>>>written in Pascal.
>>>>>
>>>>>Alan KM6VV
>>>>>
>>>>>
>>>>>
>>>>>
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>>
>>Addresses:
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>>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.
>>
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>>bill
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>
>Addresses:
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>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
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