System 3R--how to tighten collet?
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  1. #1
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    Default System 3R--how to tighten collet?

    I can't believe I have to ask what should be obvious, but where is the collet tightening screw/port/knob located? Also, the 3/8-28 threaded hole that is being pointed at, what is it's purpose? I saw several of these units pictured on Ebay and the threaded hole is empty on all of them.
    april-14-2019-012.jpgapril-14-2019-013-1-.jpgapril-14-2019-014-1-.jpgapril-14-2019-015-1-.jpg

  2. #2
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    Keep turning the brass pulley until a M6 grub screw appears through that hole, or through another seemingly blank hole. Put in the stem and do half turns until it grips the stem securely. Do not over tighten!!!

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    Luke, thanks, I don't think I ever would have found it without help.

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    Default One more 3R hydraulic chuck question-recharging

    I acquired several manual 3R hydraulic chucks with a used edm and some seem unable to tighten when the allen screw is turned. How do you refill the system and with what fluid? These are very basic, simple 20mm 3R chucks.

  5. #5
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    Hey, I’ve not yet had to do such a thing yet but I will do in the near future, in my research this is all I have found

    system_3r_repair - C&W Steel Stamp Co

  6. #6
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    Thanks again Luke, tried the refill, worked perfect!


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