Re: Re: Great deal on rotary encoders

I ordered a 24" long 360 count linear strip from US digital to make a few
more linear encoders for my machines. I want to add one to my lathe tail
stock quill and so i'll do two things . Make up the construction article and
then I will experiement with various encoder modules to see what the
empirical results are. I should have the encoder strip on monday and I'll
assemble one on wednesday.
Dan
-----Original Message-----
From: Tom Kulaga <tkulaga@...>
To: CAD_CAM_EDM_DRO@onelist.com <CAD_CAM_EDM_DRO@onelist.com>
Date: Friday, July 16, 1999 6:39 PM
Subject: [CAD_CAM_EDM_DRO] Re: Great deal on rotary encoders

>From: Tom Kulaga <tkulaga@...>
>
>> From: "Tim Goldstein" <timg@...>
>>
>>I did some of the calculations and if I worked it out correctly the LPI

for

>>this encoder is 354.5 So, using the 10% tolerance it looks as if the US
>>Digital 360 LPI strips are the ticket and no one has to pay for tooling.
>>
>>Now, who can check this out??
>
>Hmmmm... With an optical radius of 11mm, or .4331", gives a
>circumference of 2.7211". Divided by 2048 we get .0013", which is
>about 752.6 LPI. OK, OK, so I ought to use the formula for a chord,
>but that's not in my HP48, and I'm lazy ;)
>
>Or did you use an optical radius of 23.36? Hang on...
>
><calculate... calculate...>
>
>Yup, just worked it out, that's what you did. OK, so is there a head
>available that works with the 11mm wheels? If so, that gets us a
>resolution of .0003" which is great. If folks are annoyed by output
>that doesn't end in a 0, 2, or 5, I'll add code to the DRO software to
>round it off.
>
>-Tom Kulaga
>
>
>
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