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Need help with a Servo 150 power feed

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  • Need help with a Servo 150 power feed

    Has anyone ever had one of these apart? The PO really made a mess of this machine. Wires were melted, the power switch was missing, and 2 wires hang out of the switch mounting hole were wire nutted together. The rapid traverse button and pilot light were missing, and the power and limit switch cords were cut up and frayed. Despite all that it ran when I bought the mill. Since getting it home, I've taken it completely apart and replaced the bad wires, both external cords, and all the missing little parts, and to my surprise and delight, I plugged it in and it runs. BUT!! The pilot light does not light up. Since I bought a new lens and grommet for the light, I would like it to work. Also, it seems to be a bit noisy to me, so I tore it all apart again looking for bad bearings and a fuse that the parts list says is on the circuit board. I do not see a fuse on this board.
    However, the pilot lamp which is the pointy thing in this pic, is black, and looks to be burned out. I tested it in circuit and got a little reading on the 1K scale of my not too great multimeter.
    So my questions are, could this lamp also be this things fuse? Also, since the lamp is not included on the parts list, how can it be identified so I can replace it? What type lamp is it? Voltage? Neon or incandescent? Surely not an LED. I hope someone here can help me figure this thing out.
    “I know lots of people who are educated far beyond their intelligence”

    Lewis Grizzard

  • #2
    Looks like you've got an NE-2 pilot. Neon, if you can see inside you'll see two parallel rods that are the neon electrodes. Black inside means it's toast.

    You'll see infinite resistance between the leads.

    -js
    Last edited by Jim Stewart; 09-05-2019, 05:23 PM.
    There are no stupid questions. But there are lots of stupid answers. This is the internet.

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    • #3
      Thanks Jim, I'll see if I can find one locally and see what happens. May have t go to Digikey.
      “I know lots of people who are educated far beyond their intelligence”

      Lewis Grizzard

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      • #4
        McMaster stocks a few

        https://www.mcmaster.com/light-bulbs
        I just need one more tool,just one!

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        • #5
          Radio Shaft used to have them - but that was long, long ago. Yeah, Digikey or Mouser...

          -js
          There are no stupid questions. But there are lots of stupid answers. This is the internet.

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          • #6
            Dave, these guys may be some help: https://www.machinerypartsdepot.com/ Jim

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            • #7
              A thought, Dave - I said it "looks" like an NE-2. I know them well, used many in ancient and obsolete equipment. But you can figure out if that's true.

              First, an NE-2 has wire leads. Looks like it must in that spot. So you can desolder the leads and pull it out.

              Since you can't see inside, you can break the glass carefully to see what the innards are - if it's an NE-2 there will be two parallel rods, about 1/2" long, inside. If you find a filament then you have an incandescent lamp and need to do some research.

              A reason to use a neon pilot was that they use line voltage AC (with current limiting resistor) - simple and cheap.

              -js
              There are no stupid questions. But there are lots of stupid answers. This is the internet.

              Comment


              • #8
                Locks like a broken Bulb. on the Bottom the lead is loose.
                Hilmar

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                • #9
                  I've had many apart. It's a neon. Not required for operation.

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                  • #10
                    Originally posted by lakeside53 View Post
                    I've had many apart. It's a neon. Not required for operation.
                    Do you mean you've had many neons apart or Servo 150's? If its the servo, I have some questions about the bearings.
                    “I know lots of people who are educated far beyond their intelligence”

                    Lewis Grizzard

                    Comment


                    • #11
                      Thanks to all for your help. This has been an interesting undertaking to say the least. It's a good thing that the mill is not in use yet, since I've had the feed apart for a couple of months. Now that the electrics are working, albeit minus the pilot light, my attention is focused on the bearings. In the first post I said it is noisy. The shielded armature bearings feel smooth when spun between fingers. I was surprised that they are not permanently lubed, sealed bearings since there is no provision to add lube. That makes me wonder if someone has replaced them before and used the wrong type. The drive shaft runs in a caged needle bearing, and it feels sloppy. The shaft is .512 dia. and a .516 pin is a slip fit in the bearing which was dry with no sign of ever having been lubed. The lift fork assembly was coated with coagulated grease that required a good soaking in brake cleaner to remove. I gave it a dab of aircraft landing gear grease, so it should be good for a while. I'll replace all the bearings and the neon bulb and hopefully this project will be complete.
                      “I know lots of people who are educated far beyond their intelligence”

                      Lewis Grizzard

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                      • #12
                        Originally posted by Dave C View Post
                        Do you mean you've had many neons apart or Servo 150's? If its the servo, I have some questions about the bearings.
                        lol.. Servo 70 through 150, and several 150's

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                        • #13
                          Originally posted by lakeside53 View Post
                          lol.. Servo 70 through 150, and several 150's
                          I didn't really think you were into dismantling neons lol. Are the OEM armature bearings sealed or shielded? Mine are shielded which seems odd to me. I'm thinking of replacing them with sealed ones.
                          Last edited by Dave C; 09-07-2019, 01:52 PM.
                          “I know lots of people who are educated far beyond their intelligence”

                          Lewis Grizzard

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                          • #14
                            All I've seen is shielded. They seem to last forever.

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