Needs Pictures Needs Pictures:  0
Picture(s) thanks Picture(s) thanks:  0
Results 1 to 2 of 2
  1. #1
    Join Date
    Apr 2019
    Location
    Adelaide
    Posts
    45

    Default R8 Collets vs E32

    When I bought my Bridgeport it came with a small number of R8 collets. I decided to purchase a half set of Vertex ER32 (?) collets/R8 adaptor.

    Is there any benefit of using the original R8 collets vs using the ER32 collet? The only thing I can think of is that the ER32 hangs lower so reduces the working room a little. Anything else?

    I need to get a full set of one or the other (or both?).

  2. #2
    Join Date
    May 2009
    Location
    Sydney
    Posts
    32

    Default

    Wider grip range on ER collets. R8 collets only have a small range, like a 5C. For holding mill tooling which is usually to a nominal size anyway that's not a big deal.

    R8 also goes to a very slightly larger max size.

    Of course in theory R8 collets will have better runout than an collet in a collet chuck, but that depends on your collet manufacturer.

    An ER32 collet set can be used in other places whereas R8 is a mill spindle taper only. For example, I use my ERs in the lathe tailstock for small drills.

    ERs are more widely available and cheaper for equivalent quality.

    Either way, for holding milling cutters you rarely need a full set. And a full set of metric or imperial? A full set of ER32 (or better yet ER40) is versatile, but will you ever need an 11mm or 9/16 R8 collet? Would you ever buy an endmill in one of those sizes?

    Personally, I have a full set of cheap ER32s and I replaced those I use most with quality Vertex ones, all used in an excellent Vertex R8-ER32 chuck. I also have 4 quality R8s in sizes I have special use cutters for (eg a 7/8 for a couple of long series endmills) plus the 6mm and 10mm I use most. FYI, watch out for cheap Chinese R8 metric collets, they'll come with M12 drawbar threads, even though they say different on their adverts.

    Phil

Similar Threads

  1. Collets !
    By BaronJ in forum METALWORK GENERAL
    Replies: 9
    Last Post: 1st Jul 2019, 12:38 PM
  2. collets
    By Turbine Builder in forum METALWORK - Machinery, Equipment, MARKET
    Replies: 5
    Last Post: 3rd Sep 2018, 04:25 PM
  3. ER 25 Collets
    By pipeclay in forum THE HERCUS AREA
    Replies: 3
    Last Post: 10th Jul 2013, 04:25 PM
  4. Collets
    By woodfast in forum METALWORK GENERAL
    Replies: 6
    Last Post: 5th Aug 2012, 08:37 PM
  5. ER Collets
    By Anorak Bob in forum METALWORK GENERAL
    Replies: 9
    Last Post: 30th Apr 2011, 10:20 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •