Small shop Mill

Discussion in 'Workshop Tips and Secrets / Tools' started by Little Scrapper, Feb 5, 2020.

Help Support HomeBuiltAirplanes Forum by donating:

  1. Feb 7, 2020 #41

    Armilite

    Armilite

    Armilite

    Well-Known Member

    Joined:
    Sep 6, 2011
    Messages:
    3,191
    Likes Received:
    275
    Location:
    AMES, IA USA
    ============================
    For light duty Small Stuff there fine. An Emco Compact 5 CNC Lathe will do many things. Some even had a (4) Tool ATC. Many Schools used them. They made a CNC Mill also, but light Duty Plastics and Aluminum.
     

    Attached Files:

  2. Feb 7, 2020 #42

    ScaleBirdsScott

    ScaleBirdsScott

    ScaleBirdsScott

    Well-Known Member

    Joined:
    Feb 10, 2015
    Messages:
    1,115
    Likes Received:
    729
    Location:
    Uncasville, CT
    Taig can do the trick or a Seig X2/3, not much experience with either tho.

    When it comes to machining, being able to hit +/- .001 provided the operator does their bit should be a given. In the hand work world it doesn't needs get so fine tuned but in the machining world .010 seems like a mile.
     
    blane.c likes this.
  3. Feb 7, 2020 #43

    stanislavz

    stanislavz

    stanislavz

    Well-Known Member HBA Supporter

    Joined:
    Aug 22, 2016
    Messages:
    393
    Likes Received:
    100
    Location:
    Lt
    But you can get tons of tools for them just by ebaying for milling cutters job lot. IE - i got clarkson collet for threaded shank milling cutters, and ~ 15 kg of cutters for a fraction of price of er 32 collets with holder.
    And taper can be sleeved for any other smaller type.
     
  4. Feb 7, 2020 #44

    blane.c

    blane.c

    blane.c

    Well-Known Member HBA Supporter

    Joined:
    Jun 27, 2015
    Messages:
    3,807
    Likes Received:
    678
    Location:
    capital district NY
    The Morse taper and B&S taper and the ilk will slip more readily than R-8 and Cat.
     
  5. Feb 7, 2020 #45

    Aviacs

    Aviacs

    Aviacs

    Well-Known Member

    Joined:
    Oct 21, 2019
    Messages:
    79
    Likes Received:
    30
    MT + B & S will not "slip more readily" than R-8. If drawbar retained (as would be in a mill) the tapers lock so much better than R-8. In fact a common complaint of those systems is how difficult they are to remove. It's not uncommon to hear of a mill with such a taper (Jarno or B & S) that no one has been able to get the last arbor out of for a few decades.

    R8 is a relatively wimpy, relatively fast change system originated with Bridgeport, that has become ubiquitous & hence inexpensive as well. It is a good system for light duty mills like Bridgeports, but neither the best nor most accurate. R8 is so famous for slipping that it is common in industrial setting to remove the key - when the R-8 taper slips in heavy cuts, the key cuts up the tool shank and breaks off locking it in place, and the mess becomes very time consuming to take apart and clean up.

    Cat (& the National Tapers it was more or less derived from) includes the taper for locating, and is flank drive as well. No comparison to any of the above.

    For a small shop, R8 economy, facility, and the fact that it can be sourced everywhere is a plus. I do think it is the best "starter" system. R8 collets and holders will swallow larger size shanks up into the quill than some other similar size systems (good: keeps the forces closer to the bearings) It could, of course be argued that you can fit tools in R8 holders that shouldn't be driven on that size mill or holder, but there's a lot to be said for versatility and convenience, let the operator make the decisions and size the cuts and feed accordingly.

    NT30 is a step up, with import tooling is is also not noticeably more expensive to tool up. NT40 is a heavier duty system, does start to become more costly.

    There's not a lot wrong with drawbar retained Jarno, B & S, & MT tapers which are more secure than R8; except that they are inconvenient, and they are not common, hence more expensive new, and fewer options for versatility. As someone else posted, if you are given such a machine, get an ER 40, 30, & maybe a 25 collet chucks; and a good drill chuck, and use it.
     
    AIRCAB likes this.
  6. Feb 8, 2020 #46

    8davebarker

    8davebarker

    8davebarker

    Member HBA Supporter

    Joined:
    Feb 2, 2013
    Messages:
    7
    Likes Received:
    0
    Location:
    Greenacres, WA
  7. Feb 8, 2020 #47

    blane.c

    blane.c

    blane.c

    Well-Known Member HBA Supporter

    Joined:
    Jun 27, 2015
    Messages:
    3,807
    Likes Received:
    678
    Location:
    capital district NY

Share This Page

Group Builder
arrow_white