Announcement

Collapse

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

Compaq Portable 1 MPI Disk Drive Belts

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

    Compaq Portable 1 MPI Disk Drive Belts

    I have a Compaq Portable 1 which is working, but both it's 5.25" disk drives need belt replacement or refurbishment. I haven't had a lot of luck in figuring this out. Both drives are Magnetic Peripherals BR8BIA drives, and both seem to at least spin up, but the drive belt doesn't have enough tension to spin. I've read a few posts on potential drive belt replacement, but I haven't found anything definitive on how to either build a new belt, or source it; I've had some trouble measuring said belts, so I was hoping someone here might have some insight or ideas on how to get these drives going again.



    #2
    Are you sure it’s the belt and not the spindle? I had a couple of these in a 5150 (well one of the two I added to replace a Tandon that had a cap explode) that didn’t want to spin, but after taking the wheel off and oiling the bearing they both started to work fine.

    Comment


      #3
      These are the rubberized fabric belts; very hard to find replacements. On the other hand, it's not very frequent that they go bad. I've got drives from the late 70s with these belts and they're fine.

      Comment


        #4
        I had the same issue with some 8" floppy drives. They had been stored in a warehouse in Phoenix under extreme heat and the belts were not holding on. I found some rubberized fabric belts from http://www.videoelectronicsonline.com/ Look for the "FRF" in the product SKU for "Flat Rubberized Fabric".

        RF.JPG

        Comment


          #5
          Originally posted by jafir View Post
          Are you sure it’s the belt and not the spindle? I had a couple of these in a 5150 (well one of the two I added to replace a Tandon that had a cap explode) that didn’t want to spin, but after taking the wheel off and oiling the bearing they both started to work fine.
          The is notable ware and tare on the belts, and it was sticking to the spindle motor. Even now, there appears to be actual deformity on the belt. I did get a tip to try belt renewer, which I'll try and see if one of these FRF belts is the right size. It's a bit hard to figure out which one it needs.

          I had the same issue with some 8" floppy drives. They had been stored in a warehouse in Phoenix under extreme heat and the belts were not holding on. I found some rubberized fabric belts from http://www.videoelectronicsonline.com/ Look for the "FRF" in the product SKU for "Flat Rubberized Fabric".
          Hrm, that doesn't seem to list widths, although I guess I could trim it if necessary? I'll try ordering one and see if that works ...

          Comment


            #6
            Looks as if the number designations are ID length.
            • Inside Circumference: 10.500"
            • Width: .187"
            • Thickness: .022"
            PRB # FRF10.5

            A better site for the Dimensions is http://electronicsupplycorp.com/cont...0.999__04.html

            You could cut a strip of paper just wide enough to go around both pulleys (Drive & Driven). Then Insert a Junk Floppy, to gently hold the
            pulley in place, and tape one end of the paper to the Driven Pulley. Stretch it around and where they overlap (in an open area) cut both into.
            That will give you a good ID measurement. Locate a Belt a mm or two shorter than your measured distance.

            Larry

            Comment


              #7
              So... I have a Brother WP-75 word processor which had a disintegrated band in the floppy disk drive.

              After about 30 minutes of cleaning it out with isopropyl alcohol and Q-tips it was nice and clean.

              I had no band for it, so after scanning these forums I was somewhat disheartened by the price and availability of these bands, never mind trying to find the right one... so I just used a sturdy rubber band and after putting it all back together it works really well. Can't wait for that *snap* sound though haha!

              In the meantime I'll try finding something a bit more permanent.

              Comment


                #8
                Try printing a belt in TPU. It's a lot more durable than a rubber band.

                Comment

                Working...
                X