Forum etiquette

Our mission ...

This forum is part of our mission to promote the preservation of vintage computers through education and outreach. (In real life we also run events and have a museum.) We encourage you to join us, participate, share your knowledge, and enjoy.

This forum has been around in this format for over 15 years. These rules and guidelines help us maintain a healthy and active community, and we moderate the forum to keep things on track. Please familiarize yourself with these rules and guidelines.

Remain civil and respectful

There are several hundred people who actively participate here. People come from all different backgrounds and will have different ways of seeing things. You will not agree with everything you read here. Back-and-forth discussions are fine but do not cross the line into rude or disrespectful behavior.

Conduct yourself as you would at any other place where people come together in person to discuss their hobby. If you wouldn't say something to somebody in person, then you probably should not be writing it here.

This should be obvious but, just in case: profanity, threats, slurs against any group (sexual, racial, gender, etc.) will not be tolerated.

Stay close to the original topic being discussed
  • If you are starting a new thread choose a reasonable sub-forum to start your thread. (If you choose incorrectly don't worry, we can fix that.)
  • If you are responding to a thread, stay on topic - the original poster was trying to achieve something. You can always start a new thread instead of potentially "hijacking" an existing thread.

Contribute something meaningful

To put things in engineering terms, we value a high signal to noise ratio. Coming here should not be a waste of time.
  • This is not a chat room. If you are taking less than 30 seconds to make a post then you are probably doing something wrong. A post should be on topic, clear, and contribute something meaningful to the discussion. If people read your posts and feel that their time as been wasted, they will stop reading your posts. Worse yet, they will stop visiting and we'll lose their experience and contributions.
  • Do not bump threads.
  • Do not "necro-post" unless you are following up to a specific person on a specific thread. And even then, that person may have moved on. Just start a new thread for your related topic.
  • Use the Private Message system for posts that are targeted at a specific person.

"PM Sent!" messages (or, how to use the Private Message system)

This forum has a private message feature that we want people to use for messages that are not of general interest to other members.

In short, if you are going to reply to a thread and that reply is targeted to a specific individual and not of interest to anybody else (either now or in the future) then send a private message instead.

Here are some obvious examples of when you should not reply to a thread and use the PM system instead:
  • "PM Sent!": Do not tell the rest of us that you sent a PM ... the forum software will tell the other person that they have a PM waiting.
  • "How much is shipping to ....": This is a very specific and directed question that is not of interest to anybody else.

Why do we have this policy? Sending a "PM Sent!" type message basically wastes everybody else's time by making them having to scroll past a post in a thread that looks to be updated, when the update is not meaningful. And the person you are sending the PM to will be notified by the forum software that they have a message waiting for them. Look up at the top near the right edge where it says 'Notifications' ... if you have a PM waiting, it will tell you there.

Copyright and other legal issues

We are here to discuss vintage computing, so discussing software, books, and other intellectual property that is on-topic is fine. We don't want people using these forums to discuss or enable copyright violations or other things that are against the law; whether you agree with the law or not is irrelevant. Do not use our resources for something that is legally or morally questionable.

Our discussions here generally fall under "fair use." Telling people how to pirate a software title is an example of something that is not allowable here.

Reporting problematic posts

If you see spam, a wildly off-topic post, or something abusive or illegal please report the thread by clicking on the "Report Post" icon. (It looks like an exclamation point in a triangle and it is available under every post.) This send a notification to all of the moderators, so somebody will see it and deal with it.

If you are unsure you may consider sending a private message to a moderator instead.

New user moderation

New users are directly moderated so that we can weed spammers out early. This means that for your first 10 posts you will have some delay before they are seen. We understand this can be disruptive to the flow of conversation and we try to keep up with our new user moderation duties to avoid undue inconvenience. Please do not make duplicate posts, extra posts to bump your post count, or ask the moderators to expedite this process; 10 moderated posts will go by quickly.

New users also have a smaller personal message inbox limit and are rate limited when sending PMs to other users.

Other suggestions
  • Use Google, books, or other definitive sources. There is a lot of information out there.
  • Don't make people guess at what you are trying to say; we are not mind readers. Be clear and concise.
  • Spelling and grammar are not rated, but they do make a post easier to read.
See more
See less

IBM Model 29 Keypunch Station

  • Filter
  • Time
  • Show
Clear All
new posts

    Whie I patiently wait for additional documentation I decided to focus on the printer.
    At this point I've been warned by multiple people, other keypunch owners and retired IBM techs, that disassembly of the printer is absolutely not recommended even for cleaning unless absolutely necessary due to the extreme complexity of realigning the codeplate. Removal was relatively straightforward with one alignment noted and once removed I found it was relatively clean and the pins were all free moving. Here's the print head under a microscope.

    There are a few bent pins but I was unable to straighten them as none of my tools were small enough. To give you an idea about how small these pins are, a regular sewing needle is about twice the diameter. I'll just have to live with this.

    The unit will be hand cleaned but lubrication of the print head will be interesting since disassembly cannot be performed. the idea is to leave the head soaking overnight in iso and then tomorrow use a syringe to carefully oil each wire and let a drop or two of oil soak into the head via capillary action.

    [Need something to waste time on? Click here to visit my YouTube channel CelGenStudios]
    [No time for videos? Click here to visit my Twitter feed @CelGenStudios]

    = Excellent space heater


      Well, if you get stuck on those pins, I suspect that replacements can be fashioned from music wire, which tends to be quite hard.


        Nah they retract fine so unless the print quality seriously suffers I'm leaving them alone. I seriously do not want to dismantle it.
        [Need something to waste time on? Click here to visit my YouTube channel CelGenStudios]
        [No time for videos? Click here to visit my Twitter feed @CelGenStudios]

        = Excellent space heater


          Print head cleaning and lubrication completed and it's been reinstalled in the punch.

          The rest of the day was spent cleaning and polishing the main card path. A lot of it comes apart without too much of a fuss and I was able to hand clean each part. I'm using Turtle Wax chrome polish. Does as good of a job on aluminum as it does on the Eagle lol. Everything is cleaning up amazing.

          With that looking good I decided it was time to see if the motor came up so out came the oiling syringes and grease. It took about an hour to nail down and get every cam lobe, bearing and joint I could find but once the motor was attached other than aformentioned bad belts it idled nice and quiet.

          I then began manually actuating bail trips and greasing more areas. By the end of the night I was able to feed a card down from the input hopper (albeit it kept jamming because of the bad rollers), register at the punch station, advance it through the punch and register it at the read station, advance through the read station and into and into the output hopper where I could then stack it. I was also able to trip the print bail as well as supress printing while tripping the print supress solenoid.

          That gets the mechanical section taken care of for now. Just some more polishing and that's all ready to be reunited with the cabinet.
          Electronically, CuriousMarc was able to get back to me with the wiring diagrams I needed (thank you Mr. Verdiell) and I was immediately able to identify the two disconnected wires in my relay frame. The weekend is over but I should be able to tackle that this week, contacts.
          [Need something to waste time on? Click here to visit my YouTube channel CelGenStudios]
          [No time for videos? Click here to visit my Twitter feed @CelGenStudios]

          = Excellent space heater


            Very interesting, hopefully it will be in full working condition.


              Great effort. Looks incredible.


                CuriousMarc is on the game and while I was expecting scans in a few months he got them digitized in a week. Seriously dude you are a busy person and thank you for going out of your routine to help me out.

                So after analyzing the model C schematics I found that indeed some of the wiring differs from the Model B which is what was confusing me so much because so many of the undisturbed wiring was going places that didn't add up. The wire that comes from TB32-1 according to the schematics routes to relay point 17-1 Common and shared the 2-socket terminal with a jumper to 17-5 NO.

                The other wire however was a challenge because to the wiring diagram 26-8 NC doesn't go anywhere besides 26-9 and 26-10. It also was such a complicated circuit it was separated between pages.

                This entire circuit seemed to be fed 48V from the PSU however there was no continuity where I expected 48V to be so the wire could only be the 48V line. Sure enough digging further I found that DC power is distributed in series to everything via multiple strings and in this string I could now follow continuity up until 14-1 Common, so that had to be where the wire went.

                Well that cleans up the wiring. Now the relays.....
                [Need something to waste time on? Click here to visit my YouTube channel CelGenStudios]
                [No time for videos? Click here to visit my Twitter feed @CelGenStudios]

                = Excellent space heater