Announcement

Collapse
No announcement yet.

South Bend Mill tool holders

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • BMSS
    replied
    I went out and took a couple of pictures of the mill and its toolholders. I can't post here, but you can see the pictures at: http://s552.photobucket.com/albums/j...ool%20holders/

    It appears to me that the original motor was removed, and replaced with a single phase motor. When that was done, the drawbar could no longer be used. (I have the original motor, the previous owner sent it with the mill.)
    I think that is when they started using this locking system.

    Thanks for the suggestions Al & Paul, I will have to do some more reading.

    Leave a comment:


  • alanganes
    replied
    I have one of these mills, I've had it for almost 20 years. It is less rigid than the typical Bridgeport, but I have found it adequate for all of my hobby grade work, and never felt a burning need to upgrade. Like anything else, it's fine within it's capability.

    I have an original manual for mine, it calls the spindle taper out as a #30 MMT, which it defines elsewhere as "Milling Machine Taper". I don't know what the modern equivalent is, but I recall making note of info someplace that gives the "modern" designation. I'll see if I can find it. I also think that most of the modern toolholders may lack the 2 "pockets" in the taper that the SB mill uses to hold the toolholder in the spindle. Not to state the obvious, but you could likely measure what you have and compare to the published outlines for the NMTB taper. You may have to add the pockets, but I don't imagine they would need to be super precise.

    This page indicates that the NMTB taper is also called a "MM" taper:

    http://www.timgoldstein.com/cad_cam/tapers.htm

    Scroll down to "single flange tapers" and read...

    I have 2 collet holders, the shell mill holder and the original accessory boring head (Made by Flynn Machine & tool and still available) so have never really needed to hunt down additional holders.

    I think I have a scanned copy of the manual, if you would like a copy. It includes parts lists and some exploded views of the various assemblies. I could post someplace for download, or email it to you, if you wish.

    -Al A.

    Leave a comment:


  • pcarpenter
    replied
    While there are lots of variants of the NMTB tool holders (most of which relate to the flange) I believe the 30NT probably refers to the 30 (National Machine Tool Builders) NTMB taper standard. Some stuff is marked 30 NAT. This standard came about in the 30's as I recall and if you have a Machinery's Handbook, you can read a bit more about it including the dimensions. The tapers for ,40, and 50 are the same as CAT 40 and 50 if I understand correctly although the flange and mount method are not the same. The CAT uses "pull studs" rather than drawbar threads for quick tool changes in CNC machines with automatic tool changers.

    If you can verify this, then what you have is a standard taper and there is tooling available. I have a cheap import horizontal mill that uses the 30 NMTB taper for its standard arbors and I have some end mill holders and shell mill holders as well. I think you will find that Shars or some other import place may even have some tooling to save you money.

    The MT2 item is, I assume, an adaptor to Morse Taper 2??

    Paul

    Leave a comment:


  • BMSS
    started a topic South Bend Mill tool holders

    South Bend Mill tool holders

    I have a South Bend vertical mill that I bought used about a year ago, from its second owner. He had bought it from a High School that had closed its Vo-Tech. I have been doing some research, and found that there was a discussion a while back; http://www.practicalmachinist.com/vb.../t-129155.html

    It seemed that most people didn't have good opinions of the SBM. For me it works fine. It suits me.

    I am hoping on buying some tool holders for it, but haven't had much luck. a couple of the tool holders that I can actually read are marked;
    Bakuer 30-2MT and Bakuer 30NT

    Does anyone here know where I might find some tool holders for this machine? I have looked around, and haven't had much luck finding any.
Working...
X