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Thread: Clamp Knurler Repair

  1. #1
    jjr2001's Avatar
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    Clamp Knurler Repair

    I have one of the current clamp knurlers from LittleMachineShop. Very similar to many that
    can be found on the net. The shaft pins for the rollers are simply installed with snap rings
    and they wear fast. Also there is a lot of clearance on the width of the knurl wheel housings.

    I replaced the pins (all 4) with shoulder bolts. 1/4" cap screw type worked out perfect.
    They seem to be a bit tougher than the pins and you can reduce the side clearance
    of the wheels and the arms. This increases the rigidity of the knurling tool. Don't take out
    all of that side clearance, leave just enough for a smooth action. You could also make some
    shim washers to remove that clearance and continue to use the original snap ring shafts or
    still replace the pins with shoulder bolts.

    The shoulder bolts are 1" long with the shoulder being about 5/8" long. You need to grind about
    3 threads from each bolt to provide as much clearance to your lathe chuck as possible. I also
    grind a flat on one side of each bolt. Keeps it from turning when tighting the nut and provides
    the needed clearance for the bolt head to fit the knurler's arms.
    Buy extra shoulder bolts for replacements when these new ones wear out. I consider them
    consumables.

    Cheers, JR
    Attached Thumbnails Attached Thumbnails Clamp Knurler Repair-img_1478b-copy.jpg   Clamp Knurler Repair-img_1479b-copy.jpg  

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  3. #2
    Paul Jones's Avatar
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    JR,

    I have been wanting to do something similar with my scissor-style knurling tool. It is made from hardened steel so using a tap to cut threads would be difficult so i like your method better.

    Do you use one nut, a jam nut combination or a Nylock nut ?

    Thank you for posting this.

    Regards,

    Paul

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    jjr2001's Avatar
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    Paul, I just used a single nut. I have used it many times since and it stays tight as it is.
    I thought I might have to use blue loctite but that has not been necessary.

    Cheers, JR

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    I made one like Rudy Kouhoupt plans in Home Shop Machinist used 1/4" dowel pins with a flat ground on ends with a set screw in arms on the flat of the pins.

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    Quote Originally Posted by nextofkin View Post
    I made one like Rudy Kouhoupt plans in Home Shop Machinist used 1/4" dowel pins with a flat ground on ends with a set screw in arms on the flat of the pins.
    Sounds like that would work also. Depending on the hardness of the dowel pins as compared to the Knurls the wear could be greater on the knurls.
    I would rather the wear was on the "pins" or shoulder bolts than the knurls. Pins and bolts are cheap knurls are not. Just sayin.

    Cheers, JR

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