Rivett 1020S - Spindle not 6R?
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  1. #1
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    Default Rivett 1020S - Spindle not 6R?

    I知 still working through getting the Rivett set up. I知 puzzled by an issue with the collets/spindle. I have an L0 taper spindle and I assume a bore made to take 6R collets. The problem is the collets won稚 seat all the way.







    The taper portion of the spindle only extends inward about .708.



    But the taper portion of the collet as shown above is obviously longer.

    The opening at the end of the spindle is about 1.672 and the end of the collet measures 1.670. Seems right.

    According to this site:

    http://www.deprecision.com/RivettLat...FORMATION.html

    The head length should be 27/32 on a 6R collet. But mine measure about .961.

    Video below may help.

    YouTube


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    Upon further inspection of the collets (and plainly visible right at the beginning of the video) the taper on the heads doesn稚 extend all the way to the end of the collet. The tapered section is about .760 long.


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    Travis, The collet in the foreground is a 3mt adapter, then a Rivett 6R collet in the middle and then a Hardinge 6H collet at the rear.
    They all have the same taper angle. The 3mt has a straight portion extending its length out of the spindle.
    The Hardinge 6H has a shorter taper length but everything else is the same.
    I prefer the Hardinge collets over the Rivett.
    All your dimensions are the same as mine.dscn0130.jpgdscn0127.jpgdscn0128.jpgdscn0129.jpg

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    Balas also made a 6H collet with a flat face.
    I believe that Balas made the Rivett collets because some of my Rivett stamped collets are also stamped Balas and they are identical to the only Rivett stamped collets.dscn0131.jpg

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    Hardinge did make a 6R collet also.
    Here's one in the foreground compared to the Hardinge 6H.dscn0132.jpg

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    I see by looking at a collet I have that it doesn't have the flat section at the end.

    But the big question is what's keeping the collets and the adapter from seating properly in the spindle. Greg, what's the distance from the front of your spindle nose to where the taper ends in the spindle?

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    It's about .700.
    There should be a key in the spindle that the slot in the collet engages.
    Unless it was sheared off or just removed to gain more through spindle capacity.

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    Default Rivett 1020S - Spindle not 6R?

    Hmm. That痴 the same as mine. I just can稚 figure what痴 keeping it from seating. I can稚 visibly see anything in the way. The video in my first post shows the problem.

    I do indeed have a key in the spindle nose. No clue how it痴 attached.


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    I just watched the video.
    Strange. Maybe try tapping it in with a rubber mallet.
    Make sure you have a rod that you can use to knock it out from the other end.
    Could the end of the collets slot be bottoming out on the key ?

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    Turn a piece of brass or soft steel the diameter of the straight portion minus a few thousandths, and then slot it for the key. See if you can push it all the way in to where it equivalently should be. I agree that the key is somehow the issue.

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    Quote Originally Posted by rustytool View Post
    I just watched the video.
    Strange. Maybe try tapping it in with a rubber mallet.
    Make sure you have a rod that you can use to knock it out from the other end.
    Could the end of the collets slot be bottoming out on the key ?
    Based on measurements I致e taken, no. The cooler is going about a half inch into the key. And should have plenty of room to go further.

    In the video you can see me rotating the collet and getting the key engaged then pushing about 1/2 from there.

    The rubber mallet is my next step. I知 waiting for a 1.375 pipe I ordered so I can knock it back out from the other end.




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    Quote Originally Posted by bll230 View Post
    Turn a piece of brass or soft steel the diameter of the straight portion minus a few thousandths, and then slot it for the key. See if you can push it all the way in to where it equivalently should be. I agree that the key is somehow the issue.
    I too think it has something to do with the key just not sure what. When I get the pipe I知 going to slot it slightly wider than the key and see how far it will go in.


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