Announcement

Collapse
No announcement yet.

"M" head...should I bother?

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

  • "M" head...should I bother?

    Hey guys!
    Geez..I'm having second thoughts here.
    I took the M head off my VN yesterday and was going to make an adaptor to fit it on my Ohio horizontal.
    I didn't think it'd be that big a deal but now that I've measured it all up...it's going to be a bigger job than i thought.
    I have the 1" thick plate all marked out and ready to cut...
    Now I'm thinking...this M head is pretty light...MT2 spindle..need to buy a new motor (old one is 575V). I don't even know if the M head bearings ar ok...no real way to test it other than tearing it down (not an easy job)
    The only advantage I can see over my R-8 mill drill is that I'd have the knee to work from.
    Can anyone point out any real advantage that I may have missed?
    BTW...THE VN is not an option yet...needs it's own new building and it's all 575V also.
    Thanks!
    Russ
    I have tools I don't even know I own...

  • #2
    Hmmm..not a lot of support here for the old M head huh?
    If it was a J head...I wouldn't have even asked It woulda been on there already.
    I looked at KBC for an offshore copy of a J. Whew! They want almost as much for a head as they do for a whole Bridgey clone. Yikes!
    I have tools I don't even know I own...

    Comment


    • #3
      Sounds like you may be better off selling the M Head Russ, and I'm sure there would be plenty of takers if you advertised it in the right place.

      Alternatively, as you already have a 1" adaptor plate almost ready, why not make this a 'swivel' plate, find a nice knackered old pedestal drill, and make an M head pillar drill with swivel capacity?
      I'm sure it would be more than useful for drilling odd angled holes on some of your fabrication jobs, and MT2 is perfect for that.

      Peter

      Comment


      • #4
        Peter...LOL ! I just happen to have a wornout pillar drill. I'll have to see how it will fit!
        I have tools I don't even know I own...

        Comment


        • #5
          I'm not particularly fond of M heads, I really don't know why Bridgeport even continued making them with the advent of the J.

          Comment


          • #6
            The M Head is Small

            The Smaller Quill gets into tighter Places, and No J Head ran 12000 like the High Speed M Head...

            Bearings are no Big Deal, And only A Spanner needs to be made to get Spindle Locknut off.

            It is a Light Unit, but I have been Plowing thru 3/4 CR Plate with a 1/2 in Rougher..... Making a J Head Adapter

            I will Put the M Head on my Old #1 Cinc. It will be a good match, Size and Power wise, to rest of Mill...

            If You Have It, Use It...
            Last edited by Bguns; 01-14-2009, 03:23 AM.

            Comment


            • #7
              Bguns...Thanks for that!
              I asked because I've been reading about the M head....some said you would have a very hard time using a 1/2" drill bit in them...they couldn't take the "abuse".
              Seemed rather silly to me. My old Jet drill press often has 1" S&D drill bits in it and it has lasted for 20 years. Nope...it's not stood up well but it's good enough for fab work. The only thing...my drill press does turn slower than the M head.
              Still kicking this over.
              The Ohio has a bent spindle and another shaft inside...having a verticle head on it would restore a lot of it's capabilities.
              The all axis power feed on the old mill are very nice and work well.

              LOL! I push my mill drill pretty hard. I don't know if you saw my previous post but I really do cut 3/4" plate....with 1/2" corncobs...full depth passes when cutting slots.
              It has enough power to run 3/4" roughers making the same cut if i needed it.
              There is no way the M head will do this.
              I've seen it reffered to as "The toolmakers" head.
              There's a guy from Cowgary who comes here...quasi...I think he has a BP from about the mid 80's that has a factory installed M head.
              I guess...in the end...I'll never know unless i try it...
              Russ
              I have tools I don't even know I own...

              Comment


              • #8
                Originally posted by Bguns
                The Smaller Quill gets into tighter Places, and No J Head ran 12000 like the High Speed M Head...
                Did the High-speed M-Head have special bearings?
                "Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did."

                Comment


                • #9
                  Originally posted by lazlo
                  Did the High-speed M-Head have special bearings?
                  Robert...the little bit of info I've found out about the high speed head...it used a 3600 rpm motor. The regular M head uses a 1200 rpm motor.
                  I've been looking into a suitable C frame replacement motor...the 1200 rpm is the kicker..I've found 1750 and 3600 rpm motors but would like a 1200 for obvious reasons (slower spindle speeds)
                  I've seen no mention of special bearings in the high speed head but I'm betting they are a higher spec bearing.
                  I'll have to ask...I'm almost betting those bearings had preload of somekind...
                  I have tools I don't even know I own...

                  Comment


                  • #10
                    Originally posted by torker
                    I've seen no mention of special bearings in the high speed head but I'm betting they are a higher spec bearing.
                    I'll have to ask...I'm almost betting those bearings had preload of somekind...
                    That's the reason I was asking Russ -- the Millrite had a high-speed spindle option, but it had a different bearing configuration.

                    People ask all the time on the PM Bridgeport sub-forum what's the highest safe spindle speed, and the experts there usually recommend a max of 5400 RPM or so...

                    The Bridgeport uses a pair of light preload 7207's, and according to the bearing manual, a light preload should be good to upwards of 30,000 RPM. I think the reservations may be directed at the other components in the head, but if the stock M-Head can do 10,000 why not the J-Head?
                    "Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did."

                    Comment


                    • #11
                      I'm wondering if it isn't because the M head is a far simpler head than a J.
                      There really is nothing to them.
                      I have tools I don't even know I own...

                      Comment


                      • #12
                        High Speed M Head also used Flat belt...

                        Torker, put a Little VFD on it, I just helped a Buddy do His M Head VFD on a B&S Mill. You can run belt up a notch or 2 to get some proper Belt Wrap/Power in Steel... You Need a New Motor anyway, Get a 1 hp Surplus C face motor with a Short shaft and weld on extension... And VFD away..

                        Don't Know about High Speed Bearings, but Have normal Numbers for Factory preloaded proper Angular Contacts if your bearings are Bad. I think they were rated to 12k or so anyway..

                        The Little Spindle Means Smaller Bearings, meaning they can Spin faster without Bearing speeds getting crazy and Mist oil Lube or expensive Cooling etc...

                        Will Drill 1/2 just fine, And a Corncob at 1/2 in with 3/4 Depth of cut in Steel will go, just not to Proper Torker Speed

                        I use my Big Cincy for Bigger work, but the M Head Gits er done...

                        Any Chance of Regrinding you Horiz Spindle Taper in place, to get some use out of it?
                        Last edited by Bguns; 01-15-2009, 01:35 AM.

                        Comment


                        • #13
                          Bguns...you got my attention now. It wouldn't be that bad then if i could do that stuff with it.
                          I'm still needing a motor tho...I would have a devil of a time to power up that 575V motor.
                          A 3ph 220V/with VFD would be the ticket alright. I'll have to keep looking.
                          I have tools I don't even know I own...

                          Comment


                          • #14
                            I found a 1.5hp one for my J Head at SurplusCenter.something
                            Weighs about the same as The original M Head 1/2 HP US Motor..

                            Old pic but that is 3/4 Steel there.. Only the straight end cuts were full depth.
                            Rotary Table did not like Full depth on radius



                            M Head rated for 1/2 in Drilling, Old J head 3/4, Late 2J 7/8ths...

                            M Head rated at 1 cubic inch per Min Milling, Old J Head 1.5, 2J 2.0

                            Boring Cap M Head 1.5 in(Probably belt wrap limited on Low rpm Belt position......) J, 2J 6.0 in

                            From M-105H Bridgeport Maual dated 81 .
                            Last edited by Bguns; 01-15-2009, 02:33 AM.

                            Comment


                            • #15
                              Originally posted by torker
                              Hmmm..not a lot of support here for the old M head huh?
                              If it was a J head...I wouldn't have even asked It woulda been on there already.
                              I looked at KBC for an offshore copy of a J. Whew! They want almost as much for a head as they do for a whole Bridgey clone. Yikes!
                              Take Your mill/drill head and mount it on the Ohio then put the M head on the mill/drill base and if You have an old beat up radial arm saw You could put together a surface grinder .
                              Don't hate Me Russ , It is all Fast Tracks fault .

                              Steve

                              Comment

                              Working...
                              X