Rotary table with digital readout in degrees - can not find any information about it.
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  1. #1
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    Default Rotary table with digital readout in degrees - can not find any information about it.

    I have bought a Yuasa almost 12" rotary table with a threaded center hole and a great digital display, it reads out to the seconds.
    I can not find any info about the thing? I haven't even found anything about a digital readout like this?
    Yuasa international stock number 550 - 312.

    I want to make a plug for the center hole but I'm unsure of the threads, MM 55 x 3 I think. I have not had to work with metric stuff much. I hope someone can lead me to a manual or other info about this table.
    Attached Thumbnails Attached Thumbnails img_1735.jpg   img_1736.jpg   img_1737.jpg  

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    The Yuasa catalog available on their website lists the 550 series tables and specifications. The catalog is downloadable or online-readable. I suspect, particularly in light of the Perkin-Elmer property tag, that either this was a Yuasa custom item specially done for Perkin-Elmer, or the DRO was an add-on by Perkin-Elmer after purchase. The threaded center hole is most likely also a Perkin-Elmer modification.

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    Default Perkin-Elmer ?

    Thanks for the reply, I am not familiar with Perkin-Elmer, there also was a sticker about property of Newport Corp.
    I guess I'll do trial and error cutting threads for the hole.

    Thanks .........Steve

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    You could buy a metric thread pitch gauge, so you don't have to do a bunch of guessing.

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    I have two but they do not go coarse enough, 8 tpi was off just a little bit. I used a course tap and checked with that, pitch 3 mm looks gooder than the 8tpi. The major dia is what is confusing me, 55 or 56 mm. The id of the bore is 52.22 mm using a inside mic and digital calipers. So hit or miss, I'll start with the bigger size and 3 wire if I can figure out metric 3 wire size formula.

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    If I were going to make a centering plug for locating the table center, I would first check the larger diameter above the thread, and see whether that is accurate/concentric to the table rotation, and could be used as the reference. The plug could then have a diameter that would simply drop down into the minor diameter of the thread. This assumes that your intent is indeed to make a centering plug. OTOH, if you just want a cover plug for the center hole, threading it is a good way to keep it in place. As Blazemaster notes, a metric pitch gage might save some guesswork.

    ** Just saw your post - never mind about the pitch gage...
    Last edited by specfab; 06-13-2021 at 11:35 AM. Reason: update

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    Quote Originally Posted by specfab View Post
    If I were going to make a centering plug for locating the table center, I would first check the larger diameter above the thread, and see whether that is accurate/concentric to the table rotation, and could be used as the reference. The plug could then have a diameter that would simply drop down into the minor diameter of the thread. This assumes that your intent is indeed to make a centering plug. OTOH, if you just want a cover plug for the center hole, threading it is a good way to keep it in place. As Blazemaster notes, a metric pitch gage might save some guesswork.

    ** Just saw your post - never mind about the pitch gage...
    That is a great idea, check the counterbore and make sure it is concentric. Who ever modified it did a great looking job, looks ground. Since the hole is so big (2 3/16") I wanted a solid support there for smaller parts and a indicating hole. I thought I would plug it then center the table under the quill
    then make the indicating hole.

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    I have a 280MM Yuasa 4th axis on one of my machines. The T-slot faceplate is threaded like that in the pictures and the table comes with a nice threaded plug to close the hole to keep shit out when your not using it.

    If it were in my world I would turn up a plug that was a tap fit from plastic or make a metal one with an O-ring to seal and hold it.

    Then you don't have to fuck with the threads for a large manual rotab that will be used once a decade.


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