Friction Disc Coupling - Grundig und Saba (und anderen)
ID: 44559
Friction Disc Coupling - Grundig und Saba (und anderen)
24.Feb.05 16:03
0
Herren,
Ich habe VIELE Foren gesucht, um etwas Detailinformationen betreffend sind die Justage, die Reparatur oder den Wiedereinbau der kleinen Friktion Scheibe Koppelungen auf den Grundig und Saba Radios zu finden.
Nachdem viele Jahre des Gebrauches, das Friktion Material anfängt, "Abrutschenprobleme" zu verursachen. Ich habe eine Lösung gesehen, die die Einfügung einer dünnen Gummischeibe und den Gebrauch von feiner hohler Nadelanwendung von "superglue" zu einer Seite der Scheibe miteinbezieht.
Ich bin für die freundliche Unterstützung von Mitgliedsherr Werner Hauf am anerkennendsten, der eine komplette gute benutzte "Kupplungsbaugruppe und eine Welle" für einen meiner Saba Radios zur Verfügung gestellt hat. Die Grundig sind eine andere Variante. Ich würde groß alle mögliche Anmerkungen schätzen.
Mit Freundlichen Grussen,
Robert
Ich habe VIELE Foren gesucht, um etwas Detailinformationen betreffend sind die Justage, die Reparatur oder den Wiedereinbau der kleinen Friktion Scheibe Koppelungen auf den Grundig und Saba Radios zu finden.
Nachdem viele Jahre des Gebrauches, das Friktion Material anfängt, "Abrutschenprobleme" zu verursachen. Ich habe eine Lösung gesehen, die die Einfügung einer dünnen Gummischeibe und den Gebrauch von feiner hohler Nadelanwendung von "superglue" zu einer Seite der Scheibe miteinbezieht.
Ich bin für die freundliche Unterstützung von Mitgliedsherr Werner Hauf am anerkennendsten, der eine komplette gute benutzte "Kupplungsbaugruppe und eine Welle" für einen meiner Saba Radios zur Verfügung gestellt hat. Die Grundig sind eine andere Variante. Ich würde groß alle mögliche Anmerkungen schätzen.
Mit Freundlichen Grussen,
Robert
Für diesen Post bedanken, weil hilfreich und/oder fachlich fundiert.
Could you post on model ?
03.Mar.05 13:15
Dear Robert
though I have a little problem to fully understand your message I´d like to advice linking this thread with a certain model. I own a few Grundig Radio sets but haven´t seen such a friction disk yet, possibly a little pic may help getting the messages through.
Cheers
Hans
though I have a little problem to fully understand your message I´d like to advice linking this thread with a certain model. I own a few Grundig Radio sets but haven´t seen such a friction disk yet, possibly a little pic may help getting the messages through.
Cheers
Hans
Für diesen Post bedanken, weil hilfreich und/oder fachlich fundiert.
Will post to Grundig model 5295
03.Mar.05 16:51
Dear Hans,
I believe the disc coupling concept is quite similar to that in an automobile manual shift transmission which uses a friction material on a disc. It is found mating to a "flywheel" as on many Grundig radios. Also it is quite similar to the concept that is used on many Saba models. . .such as Konstanz 8 Automatic.
However, on the Saba models, the flywheel is replaced with a "smaller drum" or "cylinder" which has the schaumstoff material adhered to either end of the cylinder an a smaller disc.
I hope I am describing it with the most appropriate terminology. I shall post photos from the Saba Konstanz 8 Automatic assembly (that I have repaired), and similar photo of the AM - FM coupling portions from the Grundig model 5295.
MFG,
Robert Anlagen:
I believe the disc coupling concept is quite similar to that in an automobile manual shift transmission which uses a friction material on a disc. It is found mating to a "flywheel" as on many Grundig radios. Also it is quite similar to the concept that is used on many Saba models. . .such as Konstanz 8 Automatic.
However, on the Saba models, the flywheel is replaced with a "smaller drum" or "cylinder" which has the schaumstoff material adhered to either end of the cylinder an a smaller disc.
I hope I am describing it with the most appropriate terminology. I shall post photos from the Saba Konstanz 8 Automatic assembly (that I have repaired), and similar photo of the AM - FM coupling portions from the Grundig model 5295.
MFG,
Robert Anlagen:
- SchaumstoffRepair (57 KB)
Für diesen Post bedanken, weil hilfreich und/oder fachlich fundiert.
03.Mar.05 16:59
Hello Robert
It's an often encountered problem, these non correctly working AM / FM switching mechanisms for separate AM/FM dials / tuning condensers. In most cases, both dial pointers/tuning condensers are operated together with the need of relatively high torque on the tuning button.
Reading your post let me now guess that you don't understand correctly the function of that mechanism - maybe resulting of the above mentioned often seen malfunction. You're writing of a "friction disk coupling" but that's exactly what should not be - friction.
That mechanism should switch without having any friction! Therefore the material in between the two clutch halfs differs and - also clutches with teeth have been used as alternating the one or the other outer clutch should have a tight connection with the center part.
The problems seen in our days with these clutches are resulting of hardened grease and dust. First try to lube the moving parts (but *never* the clutch itself). If you don't succeed that way, disassemble and clean the complete clutch gear. Reinstallation and adjustment may be a bit picky in some models, but mostly not a real problem ;-)
Hope this helps.
Don't hesitate to ask if you have any questions - english isn't my native language ;-)
Kind regards, Walter
It's an often encountered problem, these non correctly working AM / FM switching mechanisms for separate AM/FM dials / tuning condensers. In most cases, both dial pointers/tuning condensers are operated together with the need of relatively high torque on the tuning button.
Reading your post let me now guess that you don't understand correctly the function of that mechanism - maybe resulting of the above mentioned often seen malfunction. You're writing of a "friction disk coupling" but that's exactly what should not be - friction.
That mechanism should switch without having any friction! Therefore the material in between the two clutch halfs differs and - also clutches with teeth have been used as alternating the one or the other outer clutch should have a tight connection with the center part.
The problems seen in our days with these clutches are resulting of hardened grease and dust. First try to lube the moving parts (but *never* the clutch itself). If you don't succeed that way, disassemble and clean the complete clutch gear. Reinstallation and adjustment may be a bit picky in some models, but mostly not a real problem ;-)
Hope this helps.
Don't hesitate to ask if you have any questions - english isn't my native language ;-)
Kind regards, Walter
Für diesen Post bedanken, weil hilfreich und/oder fachlich fundiert.
03.Mar.05 18:21
Hello Walter,
I fully understand that when the AM or FM band pushbutton is "engaged" there must be NO motion transfer on the opposite (unused)band; however, there must be strong frictional adhesion from the disc mechanism to the tuning flywheel always for the respective tuning capacitor and dial pointer string of the desired band.
I fully understand that after many years of usage the matertial degrades so much that in many instances there is "excessive slippage" EXACTLY like in the automobile clutch that transfers engine crankshaft motion to the gearbox. I believe there is even a locking screw within the flywheel which must be set precisely to ensure that tolerances on both sides of the drive discs is correct. As in the automobile clutch, metal-to-metal contact yields essentially no motion of the vehicle, and well before that point is reached the clutch disc friction lining material is being worn away.
When the rubber material becomes so smooth, there is poor transfer of motion from the tuning knob shaft to the respective AM or FM output drive wheel.
I have one esteemed member who fully undersatnds and has recently provided a "fix" that is exactly as I had envisioned. In fact, his solution was even more efficient than I had considered.
Thank you so much, Walter. Your English is far superior to my Swiss or German. MFG,
Robert Anlagen:
I fully understand that when the AM or FM band pushbutton is "engaged" there must be NO motion transfer on the opposite (unused)band; however, there must be strong frictional adhesion from the disc mechanism to the tuning flywheel always for the respective tuning capacitor and dial pointer string of the desired band.
I fully understand that after many years of usage the matertial degrades so much that in many instances there is "excessive slippage" EXACTLY like in the automobile clutch that transfers engine crankshaft motion to the gearbox. I believe there is even a locking screw within the flywheel which must be set precisely to ensure that tolerances on both sides of the drive discs is correct. As in the automobile clutch, metal-to-metal contact yields essentially no motion of the vehicle, and well before that point is reached the clutch disc friction lining material is being worn away.
When the rubber material becomes so smooth, there is poor transfer of motion from the tuning knob shaft to the respective AM or FM output drive wheel.
I have one esteemed member who fully undersatnds and has recently provided a "fix" that is exactly as I had envisioned. In fact, his solution was even more efficient than I had considered.
Thank you so much, Walter. Your English is far superior to my Swiss or German. MFG,
Robert Anlagen:
- Schaumstoff Repair/Replacement (63 KB)
Für diesen Post bedanken, weil hilfreich und/oder fachlich fundiert.