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  1. #1
    Join Date
    Dec 2011
    Location
    Sydney
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    Default Collet type comparison

    I see H+F have this milling collet chuck on clearance pricing: T300 | BT40-ASC32-105 Collet Chuck Multilock (C SERIES) | machineryhouse.com.au, which takes SC-32 collets.
    Can someone advise how this system compares with ER collets? I am considering using cutters up to 25mm shank diameter.
    ER40 has less overhang, and each collet has a 1mm diameter size range (SC collets fit one size only with a small tolerance) but apart from that it is not clear which system is better for ease of tightening, security of clamping etc.

    Clarkson Autolock style holders are good in that the screwed shank will never pull out, and easy to tighten and loosen, but are pricy and not easy to find.
    Thanks,
    Bill

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  3. #2
    Join Date
    Jan 2012
    Location
    Melbourne
    Posts
    44

    Default

    Hi Bill
    Thanks for posting the link, looks like a pretty good price. I see beaten up versions come up on Ebay occasionally to and have thought about trying one, but the H&F one looks like a deal provided they are up to spec.
    They are usually called milling chucks (as opposed to collet chucks). There is a lot of discussion and varied opinions on the Practical Machinist forum. milling chuck

  4. #3
    Join Date
    Feb 2013
    Location
    Laidley, SE Qld
    Posts
    368

    Default

    From an availability point of view there is way more ER stuff available in Australia than there is SC.

    I you only ever want to hold a few sizes of milling cutter shanks the SC will work well, if you want to use them to hold drills as well you need the adaptability of ER collets.

    I have a near new Clarkson Autolock holder and collets gathering dust on a shelf.

  5. #4
    Join Date
    Dec 2011
    Location
    Sydney
    Posts
    178

    Default

    Neil,
    Thanks, the "milling chuck" link got me into the right line of searching.
    As you said, the opinions on milling chucks are varied, from what I saw the balance of opinion is:
    Advantages
    - good clamping for heavy roughing cuts with big cutters
    - good balance, low runout (and generally issues that relate to heavy use with CNC)
    Disadvantages
    - relatively high cost, compared with ER chucks
    - limited availability of collets
    - long overhang - the H+F milling chuck has 105mm spindle nose to collet face, compared with 70mm for a typical ER32 chuck (and less than 28mm for 'stubby' ER32 chucks). More overhang reduces rigidity of the setup as well as cutting down on available space.

    Bob,
    Thanks for your opinion. It's interesting that your Autolock lives on the shelf.
    I suppose if you are changing between drills and milling cutters ER is the way to go, and if the ER chuck is in place there is no call for the Autolock.

    My conclusion on the H+F milling chuck: the price is right but it's not for me.

    Cheers,
    Bill

  6. #5
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
    4,304

    Default

    Is the price right because they can not sell them because no one wants to buy them?
    Light red, the colour of choice for the discerning man.

  7. #6
    Join Date
    Dec 2011
    Location
    Sydney
    Posts
    178

    Default

    Quote Originally Posted by .RC. View Post
    Is the price right because they can not sell them because no one wants to buy them?
    The second, therefore the first, I expect.
    Bill

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