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Mill "transmission"

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  • Mill "transmission"

    About 3 years ago, I bought a Jet JVM 836-1 milling machine, a great machine for the price, but somewhat limited by having only 5 speeds, 240-1550 rpm. Based on a photo posted by Lane, made this milling machine "transmision", I now have 20 speeds, from 80-3100 rpm, much easier now to select the proper cutting speeds. At the same time I installed a 4" riser block in the mill column, a Grizzly piece for their G6760 mill, identical to the Jet mill.

    Jack







    jack

  • #2
    Or you could have bought a variable speed model.

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    • #3
      Very creative. I like the drive system and I have thought several times of making a riser for my mill.
      It's only ink and paper

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      • #4
        Bad dog would have to make a doghouse on his roof for that mill.

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        • #5
          Looks good .And besides a cheap way to gain the necessary speeds you need.
          Every Mans Work Is A Portrait of Him Self
          http://sites.google.com/site/machinistsite/TWO-BUDDIES
          http://s178.photobucket.com/user/lan...?sort=3&page=1

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          • #6
            Studying second pic - wondered what in hell that big ass spring was for??

            Third pic splained all!

            Pretty sweet change box, is the belt tension on an excentric?

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            • #7
              Belt tension

              On one side of the plate there is is a pivot bolt and the other side of the plate is slotted with a clamp bolt going through, pull the plate back to the right tension, then tighten both bolts. The system is used on the transmission to the mill, then on the motor to the transmission. The tension on each section is set seperately.

              Big a$$ spring is on the overhead door track.

              Jack
              jack

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              • #8
                In the famous words of Homer Simson ....DOH !
                ROTFLMAO

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                • #9
                  Nice modification
                  NRA member

                  Gun control is using both hands

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                  • #10
                    Very nice job of of that. Been thinking about similar things for a different machine myself to get both faster and slower speeds.
                    Originally posted by IOWOLF
                    Bad dog would have to make a doghouse on his roof for that mill.
                    The shop IS my dog house, or so says my wife. I could always dig a hole to put it in, my wife says I'm good at that too. Oops, here she comes, gotta go...
                    Russ
                    Master Floor Sweeper

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                    • #11
                      Why not fit an invertor or VFD ?
                      .
                      .

                      Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



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                      • #12
                        Or a inverter/VFD and a speed increaser for really high rpm stuff?

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                        • #13
                          Nice job on the transmission, Looks like it will do the job..

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                          • #14
                            My question would be how does it like starting up in high gear? my jvm 836 doesnt even like starting up at 1550 rpm's let alone over 3,000, i actually leave the belt loose at 1550 so it allows the motor to get up to its speed quicker then I give it a tightening push after it gets going, other question -- how does the spindle do heat wise with those kind of rpm's,

                            I know if you go the 3 phase motor you can go 2 speed and get the rpms down to 120 from 240 (wich is my biggest concern) but it wont help the top speed at all...

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                            • #15
                              Sir John,

                              I'm not completely sold on the inverter/VFD systems, I have it on 3 pieces of equipment, all bought new, factory installed. One system (drill Press) has worked fine for 2-3 years without a hitch, the second system (belt sander) has lost 2 motors, all replaced under warranty, the third system (drill press) has been terrible, I've lost 3 motors and 2 VFDs, in a 3 year period, the factory tech has been here 4 times and says nothing is wrong, after the second motor failure, they completely replaced the control system, within 6 months, I lost another motor, after it was replaced, within a month the VFD failed. Since the drill press was new about 3 years ago, it has been unuseable for about a year. They keep extending the warranty, but what good is that if it doesn't run. I know the v-belt drive system is old fashion, but it works.

                              Jack
                              jack

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