Re: Digest Number 3

I have just made two ISA PCB cards that use the US digitals 7266-R1 From:
Tom Kulaga <tkulaga@...> web site. I will let you know how it works in
a day or so.
Dan
-----Original Message-----
From: rmcilvaine@... <rmcilvaine@...>
To: CAD_CAM_EDM_DRO@onelist.com <CAD_CAM_EDM_DRO@onelist.com>
Date: Monday, May 10, 1999 5:58 AM
Subject: Re: [CAD_CAM_EDM_DRO] Digest Number 3

>From: rmcilvaine@...
>
>> ______________________________________________________________
>> _________________
>>
>> Message: 4
>> Date: Sat, 8 May 1999 09:09:43 -0500
>> From: "Steve Lindsay" <slindsay@...>
>> Subject: Re: Digest Number 1 & homebrew DRO
>>
>> I didn't know that US Digital had a PC inerface card. This would
>> be the way to go for a dro. Life is probably much similar
>> this way
><snip>
>>I would think an
>> interface card
>> would be faster
>> and US Digital is probably doing a lot of the work on the
>> hardware/interface
>> that
>> I was doing in code.
>
>Steve,
>
>This is correct. They buffer the incoming quadrature pulse train,
>therefore it is very difficult to miss a pulse. I haven't been able to
>out crank mine (the PC I'm using is a 16mhz 286!). They also do up to
>(software selectable) 4x quadrature count on board.
>
>>
>> ______________________________________________________________
>> _________________
>>
>> Message: 24
>> Date: Sat, 08 May 1999 23:52:42 -0700
>> From: garfield@... (Gar Willis)
>> Subject: Re: interface board
>>
>> On Sat, 8 May 1999 20:10:15 -0500, "Steve Lindsay"
>> <slindsay@...> wrote:
>>
>> >If US Digital has encoders to read from a linear strip this
>> >would cure the problem of slippage.
>
>This is correct.
>
>>
>> Well, they DO, but doggonit they (or you should really read
>> "HP") don't
>> have a linear resolution that in quadrature comes out to some nice
>> English (or even Metric) quantum.
>
>It is quite simple to apply any multiplier you wish in software. You can
>have it read in cubits per degree it you want.
>
>In the code I wrote you specify the unit of measure multipier, the
>quadrture multiplier, etc. in a setup file.
>
>
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