RX01 missing felt pad, repair advice

From: mc at media.mit.edu The felt pad that presses the floppy disk into the r/w head fell off my RX01 (or whatever dual floppy drive is actually inside a DECmate model III (a late edition of 6120-based PDP-8). Has anyone tried to do that repair? What did you use for replacement, self-adhesive felt material? cctalk-request at classiccmp.org wrote: > Send cctalk mailing list submissions to > cctalk at classiccmp.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://www.classiccmp.org/mailman/listinfo/cctalk > or, via email, send a message with subject or body 'help' to > cctalk-request at classiccmp.org > > You can reach the person managing the list at > cctalk-owner at classiccmp.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of cctalk digest..." > > > Today's Topics: > > 1. Re: 5" floppy?. (Jules Richardson) > 2. Re: 5" floppy?. (Sridhar Ayengar) > 3. Re: 5" floppy?. (Sridhar Ayengar) > 4. HP3000 (Mike Loewen) > 5. Re: HP3000 (William Donzelli) > 6. Re: HP3000 (Mark Davidson) > 7. Re: HP3000 (William Donzelli) > 8. Re: Help with Shugart SA801 8" floppy with 230v 50 cycle > (feldman.r at comcast.net) > 9. Re: 5" floppy?. (David Griffith) > 10. Re: 5" floppy?. (William Donzelli) > 11. Screwheads; was 5 floppy?. (Chuck Guzis) > 12. RE: Help with Shugart SA801 8" floppy with 230v 50 cycle > (dwight elvey) > 13. Re: 5" floppy?. (Dave McGuire) > 14. RE: Help with Shugart SA801 8" floppy with 230v 50 cycle > (Chuck Guzis) > 15. RE: 5" floppy?. (dwight elvey) > 16. Re:Screwheads, was: 5" floppy?. (Chuck Guzis) > 17. Re: AT&T 7300/3B1's (was: Re: Who is vintagecomputermuseum?) > (micheladam at theedge.ca) > 18. Re: AT&T 7300/3B1's (was: Re: Who is vintagecomputermuseum?) > (Gordon JC Pearce MM3YEQ) > 19. Re: AT&T 7300/3B1's (was: Re: Who is vintagecomputermuseum?) > (Lance Lyon) > 20. IDE <-> MFM, was> Re: AT&T 7300/3B1's (was: Re: Who is > vintagecomputermuseum?) (emu at e-bbes.com) > 21. Re: The Day the Infant Internet Uttered its First Words > (Steve Maddison) > 22. RE: Help with Shugart SA801 8" floppy with 230v 50 cycle > motor... (ROBO5.8) > 23. Re: AT&T 7300/3B1's (was: Re: Who is vintagecomputermuseum?) > (Jules Richardson) > 24. Re: Help with Shugart SA801 8" floppy with 230v 50 cycle > motor... (Jules Richardson) > 25. Mystery paper tape reader (Tobias Russell) > 26. MITS Disk Boot Loader manual (Richard A. Cini) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 25 Nov 2008 17:25:48 -0600 > From: Jules Richardson > Subject: Re: 5" floppy?. > To: General Discussion: On-Topic and Off-Topic Posts > > Message-ID: > Content-Type: text/plain; charset=ISO-8859-15; format=flowed > > Fred Cisin wrote: > >> It sure is easy to slip into off-topic mechanical griping. >> > > Yeah, funny how there's a lot of interest overlap between vintage computing, > old cars, and engineering (and that it says in the "to" field of this message > that the list is for "General Discussion: On-Topic and Off-Topic Posts") - but > let's not go there, huh? ;-) > > > J. > > > ------------------------------ > > Message: 2 > Date: Tue, 25 Nov 2008 19:04:06 -0500 > From: Sridhar Ayengar > Subject: Re: 5" floppy?. > To: General Discussion: On-Topic and Off-Topic Posts > > Message-ID: > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Tony Duell wrote: > >>> Even computer companies - people that should know better, make >>> mistakes when talking about floppy disks. Last week I was in a Staples >>> store (American office supply store chain), and saw a Memorex 3 1/2" USB >>> floppy drive, the package stating clearly that it supported "1.44mb >>> double sided and 720k single sided diskettes".> >>> >> Well, calling it mb (millibyte) is clearly wrong. And the value of >> 1.44Mbytes assumes you take 1Mbyte as 1000*1024 bytes, which is downright >> crazy. >> > > Actually, doesn't mb imply "millibit", and mB is "millibyte", with Mb as > "megabit" and MB as "megabyte"? > > Peace... Sridhar > > > ------------------------------ > > Message: 3 > Date: Tue, 25 Nov 2008 19:06:26 -0500 > From: Sridhar Ayengar > Subject: Re: 5" floppy?. > To: General Discussion: On-Topic and Off-Topic Posts > > Message-ID: > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Gordon JC Pearce MM3YEQ wrote: > >> (once again, sorry Jay) >> >> >>> My favourite has to be Torx. I have never had any problems with those. >>> >> Oh I have... Bloody Volkswagens with their stupid 5-lobed >> Torx-like brake caliper bolts, that you can't even get drivers for from >> VW without ordering them from Germany... >> > > My Audi uses triple-square for that kind of stuff. > > Peace... Sridhar > > > ------------------------------ > > Message: 4 > Date: Tue, 25 Nov 2008 20:01:42 -0500 (EST) > From: Mike Loewen > Subject: HP3000 > To: "General Discussion: On-Topic and Off-Topic Posts" > > Message-ID: > Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed > > > Where have all the HP3000 systems gone? > > Between 1986 and 1988, I worked on a whole slew of HP3000s, from the > Series III to the Series 70. They were popular in the business > environment, especially in COBOL shops. Where did they end up? You can > find loads of DEC equipment on Ebay, even IBM System 34, 36 and AS/400s, > the occasional HP1000, but the only HP3000 I recall seeing in recent years > was a single Model 37. > > > Mike Loewen mloewen at cpumagic.scol.pa.us > Old Technology http://sturgeon.css.psu.edu/~mloewen/Oldtech/ > > > ------------------------------ > > Message: 5 > Date: Tue, 25 Nov 2008 20:16:45 -0500 > From: "William Donzelli" > Subject: Re: HP3000 > To: "General Discussion: On-Topic and Off-Topic Posts" > > Message-ID: > > Content-Type: text/plain; charset=ISO-8859-1 > > >> Between 1986 and 1988, I worked on a whole slew of HP3000s, from the >> Series III to the Series 70. They were popular in the business environment, >> especially in COBOL shops. Where did they end up? You can find loads of >> DEC equipment on Ebay, even IBM System 34, 36 and AS/400s, the occasional >> HP1000, but the only HP3000 I recall seeing in recent years was a single >> Model 37. >> > > You answered your own question. > > DEC made loads of minis (PDP and VAX). > IBM made loads of minis (S/34 and S/36). > IBM made extra sized loads of AS/400 minis (more than any other minicomputer). > HP did not make loads of 3000s. > > I think it is a simple population thing. > > -- > Will > > > ------------------------------ > > Message: 6 > Date: Tue, 25 Nov 2008 17:27:42 -0800 > From: "Mark Davidson" > Subject: Re: HP3000 > To: "General Discussion: On-Topic and Off-Topic Posts" > > Message-ID: > > Content-Type: text/plain; charset=ISO-8859-1 > > On Tue, Nov 25, 2008 at 5:16 PM, William Donzelli wrote: > >>> Between 1986 and 1988, I worked on a whole slew of HP3000s, from the >>> Series III to the Series 70. They were popular in the business environment, >>> especially in COBOL shops. Where did they end up? You can find loads of >>> DEC equipment on Ebay, even IBM System 34, 36 and AS/400s, the occasional >>> HP1000, but the only HP3000 I recall seeing in recent years was a single >>> Model 37. >>> >> You answered your own question. >> >> DEC made loads of minis (PDP and VAX). >> IBM made loads of minis (S/34 and S/36). >> IBM made extra sized loads of AS/400 minis (more than any other minicomputer). >> HP did not make loads of 3000s. >> >> I think it is a simple population thing. >> >> -- >> Will >> > > I subscribe to the 3000 mailing list, and there seems to be one other > complaint... licensing the OS. I am no expert on the matter, but I've > gotten the impression that HP can be a real bear to deal with when it > comes to licensing the OS for users. It simply can get too expensive > for a hobbyist to run MPE... > > Trust me, I'd love to have a small 3000 at home and if one ever shows > up, I'll snap it up if I can. They just seem to be pretty rare on the > used market. > > Mark > > > ------------------------------ > > Message: 7 > Date: Tue, 25 Nov 2008 20:52:06 -0500 > From: "William Donzelli" > Subject: Re: HP3000 > To: "General Discussion: On-Topic and Off-Topic Posts" > > Message-ID: > > Content-Type: text/plain; charset=ISO-8859-1 > > >> I subscribe to the 3000 mailing list, and there seems to be one other >> complaint... licensing the OS. I am no expert on the matter, but I've >> gotten the impression that HP can be a real bear to deal with when it >> comes to licensing the OS for users. It simply can get too expensive >> for a hobbyist to run MPE... >> > > A complaint, yes, but really has nothing to do with why 3000s are so > scarce. Really, it is hard to beat the IBM AS/400 group for being > disagreeable when it comes to licenses. > > I think DEC spoiled us. > > -- > Will > > > ------------------------------ > > Message: 8 > Date: Wed, 26 Nov 2008 02:41:19 +0000 > From: feldman.r at comcast.net > Subject: Re: Help with Shugart SA801 8" floppy with 230v 50 cycle > To: cctalk at classiccmp.org > Message-ID: > > > Content-Type: text/plain > > For small pulleys, check out a hobby shop that deals in radio controlled model airplanes and cars. For small gears, try www.nwsl.com. They also have small drills, bolts, and metal rods (e.g., 1.5mm x 6"). In England, try http://www.ultrascale.co.uk/ for small gears. > > Bob > > ------------------------------ > > Message: 9 > Date: Tue, 25 Nov 2008 18:45:30 -0800 (PST) > From: David Griffith > Subject: Re: 5" floppy?. > To: "General Discussion: On-Topic and Off-Topic Posts" > > Message-ID: > Content-Type: TEXT/PLAIN; charset=US-ASCII > > On Tue, 25 Nov 2008, Chuck Guzis wrote: > > >> I once read an interview with the son of inventor Henry Phillips (an >> Oregon native) and he maintained that it wasn't the original design >> (US Patent 2046343) that was at fault, it was primarily the fault of >> ASC for cheapening the manufacturing process by relaxing >> specifications--and the propagation of inferior tools. Indeed, the >> screwdrivers I have that are labeled "Genuine Phillips" do seem to be >> quite a bit better than the generic variety. One aspect of the >> Phillips head not shared by Torx or Robertson/square is that it will >> automatically center the driving bit. >> > > I don't follow on the automatic centering. Yes, a slotted screwdriver can > slide out, but torx or robertsons? > > >> The "slipping out", I believe is referred to as "camming out". >> >> While rebuilding a deck this summer, I found that even square-drive >> screws are easy to strip when power is used to drive them. >> > > That's why you're supposed to use a drill with a slipper clutch. > > >> Fortunately, deck screws are being manufactured with the Torx head >> (mine were T25s) and allow for much better driving performance. >> > > > >