repairing a broken spring in a victrola VV 90 upright "DIY"
Posted: Thu Mar 15, 2012 8:19 am
For any who followed my post on the fake grafonola you will see I ended up purchasing a victrola VV 90 that made a "kathunk kathunk" sound after winding a while.
I had hoped that it was just a spring (or two) that had slipped their arbor or rivet pin but alas, after removing the springs from the barrel I found that the first spring I came to was broken at the rivet insert eye/hole and the second spring was well on its way to being broken, ripping slightly at the rivet hole. The inside of the spring barrel assembly was practically void of grease, just a residue was faintly left on the spring itself. After inspecting the full length I noticed that the areas around the eye hole were the only areas that has some rust starting and rust leads to failure of springs.
I am not much for waiting for parts and know from working on clocks that a spring will run reasonably well with just 80% of it's original length in a clock so why not a victrola that only needs 2 inches of its 17 foot length replaced.
I looked at some of my saved clock website notes and found a quick description of how to repair both victrola springs in about an hour.
Here is the link below to a basic description of how its done:
http://www.m-p.co.uk/muk/ryoc/doc_page27.shtml
-----------------------------------------------------------------------
Basicaly,
from another repair manual for clocks,
Broken Mainsprings. — A mainspring that is broken close to the outer end may be made to do again by punching a fresh hook hole and filing up. First soften the extreme end in the spirit-lamp flame, and hammer it flat. Then, with a mainspring punch, or an ordinary flat-ended round punch, and a graduated steel stake, punch a hole in it. A round hole is as good as any. Broach out the hole aslant so as to leave a sharp edge outside to hold well under the barrel hook. With a rat-tail file open the broached hole oval and make it quite central. Then flat the spring end on both sides by filing to remove all burrs, and shape the end up.
-----------------------------------------------------
A detailed proccess(recomended) can be found at:
http://www.atmosman.com/spring.html
which states:
9) Repairing the Mainspring
Most times a mainspring cannot be repaired. The exception is the
hole end mainspring that has a break in the hole end. This is the end which
attached to the barrel tongue or hook.
After you have removed the mainspring, hand clean the broken end
to be fixed. Then cut off the end of the mainspring. I do this with a rounded
cut using heavy-duty tin snips. Heat the last 3 to 4 inches of the "new" end
until cherry read and let the mainspring air cool. This is called annealing and
will take the hardness and temper out of the mainspring allowing you to rework it.
When the mainspring has sufficiently cooled (about five (5) minutes),
file the "new" end until it is rounded and there are no burrs or sharp edges.
Then start the new hole. I use a mainspring or power punch but you can use
a straight centering punch and a hammer. Center your hole about one to two
inches from the freshly cut top of the mainspring end. I file the punched hole
to as close to the original size as possible. Even though this process shortens
the mainspring somewhat it should have no overall effect. That is because
most mainsprings are designed to run the clock well beyond the stated
running time (day, week, etc.).
Finally, I take a fine file and make sure that there are no burrs or
"edges" where both the hole and "new" end has been cut. You can go
one step further and take some Crocus cloth or 4/0 emery paper and do
some further smoothing.
Some prefer to harden and temper the "new" mainspring end but I
find that this is an unnecessary step. That is because the mainspring end
is not subject to the stresses and movements that would require further
treatment but each to their own methods.
Have fun but please take great care when handling a clock mainspring.
-------------------------------------------
From another clock article:
The cause of mainspring breaks has always been a topic of debate. The quality of steel and heat treatment of the spring can be quite variable. This is further complicated by the fact that one never knows how the last guy fixing the clock or over zealous winder-owner has treated it. Even tiny spots of rust can lead to failure. The ends of the springs where the central portion engages the winding square or the free end is anchored may not have been tempered properly. Anchoring points should have only rounded corners, the hole in the tail of hole type springs must be the correct distance from the spring end; the barrel hook must be properly formed. I carefully unwind and very carefully examine the springs from the clocks I work on. My experience except for one clock has been that the springs break at the free end. The one exception was a mid 1800's French carriage clock which had both the time and strike springs shattered in multiple fragments, like a piece of broken glass.
-----------------------------
I will probably get around to this today or tomorrow. I will let you all know how it goes.
The way I see it, a repair is not a replacement but a repair well done does allow for long term functionality and experience learned by the repairer.
If I had patience, spare cash and lack of DIY attitude, I'd just order two replacement springs. I still might have to eventually.
Cheers!
I had hoped that it was just a spring (or two) that had slipped their arbor or rivet pin but alas, after removing the springs from the barrel I found that the first spring I came to was broken at the rivet insert eye/hole and the second spring was well on its way to being broken, ripping slightly at the rivet hole. The inside of the spring barrel assembly was practically void of grease, just a residue was faintly left on the spring itself. After inspecting the full length I noticed that the areas around the eye hole were the only areas that has some rust starting and rust leads to failure of springs.
I am not much for waiting for parts and know from working on clocks that a spring will run reasonably well with just 80% of it's original length in a clock so why not a victrola that only needs 2 inches of its 17 foot length replaced.
I looked at some of my saved clock website notes and found a quick description of how to repair both victrola springs in about an hour.
Here is the link below to a basic description of how its done:
http://www.m-p.co.uk/muk/ryoc/doc_page27.shtml
-----------------------------------------------------------------------
Basicaly,
from another repair manual for clocks,
Broken Mainsprings. — A mainspring that is broken close to the outer end may be made to do again by punching a fresh hook hole and filing up. First soften the extreme end in the spirit-lamp flame, and hammer it flat. Then, with a mainspring punch, or an ordinary flat-ended round punch, and a graduated steel stake, punch a hole in it. A round hole is as good as any. Broach out the hole aslant so as to leave a sharp edge outside to hold well under the barrel hook. With a rat-tail file open the broached hole oval and make it quite central. Then flat the spring end on both sides by filing to remove all burrs, and shape the end up.
-----------------------------------------------------
A detailed proccess(recomended) can be found at:
http://www.atmosman.com/spring.html
which states:
9) Repairing the Mainspring
Most times a mainspring cannot be repaired. The exception is the
hole end mainspring that has a break in the hole end. This is the end which
attached to the barrel tongue or hook.
After you have removed the mainspring, hand clean the broken end
to be fixed. Then cut off the end of the mainspring. I do this with a rounded
cut using heavy-duty tin snips. Heat the last 3 to 4 inches of the "new" end
until cherry read and let the mainspring air cool. This is called annealing and
will take the hardness and temper out of the mainspring allowing you to rework it.
When the mainspring has sufficiently cooled (about five (5) minutes),
file the "new" end until it is rounded and there are no burrs or sharp edges.
Then start the new hole. I use a mainspring or power punch but you can use
a straight centering punch and a hammer. Center your hole about one to two
inches from the freshly cut top of the mainspring end. I file the punched hole
to as close to the original size as possible. Even though this process shortens
the mainspring somewhat it should have no overall effect. That is because
most mainsprings are designed to run the clock well beyond the stated
running time (day, week, etc.).
Finally, I take a fine file and make sure that there are no burrs or
"edges" where both the hole and "new" end has been cut. You can go
one step further and take some Crocus cloth or 4/0 emery paper and do
some further smoothing.
Some prefer to harden and temper the "new" mainspring end but I
find that this is an unnecessary step. That is because the mainspring end
is not subject to the stresses and movements that would require further
treatment but each to their own methods.
Have fun but please take great care when handling a clock mainspring.
-------------------------------------------
From another clock article:
The cause of mainspring breaks has always been a topic of debate. The quality of steel and heat treatment of the spring can be quite variable. This is further complicated by the fact that one never knows how the last guy fixing the clock or over zealous winder-owner has treated it. Even tiny spots of rust can lead to failure. The ends of the springs where the central portion engages the winding square or the free end is anchored may not have been tempered properly. Anchoring points should have only rounded corners, the hole in the tail of hole type springs must be the correct distance from the spring end; the barrel hook must be properly formed. I carefully unwind and very carefully examine the springs from the clocks I work on. My experience except for one clock has been that the springs break at the free end. The one exception was a mid 1800's French carriage clock which had both the time and strike springs shattered in multiple fragments, like a piece of broken glass.
-----------------------------
I will probably get around to this today or tomorrow. I will let you all know how it goes.
The way I see it, a repair is not a replacement but a repair well done does allow for long term functionality and experience learned by the repairer.
If I had patience, spare cash and lack of DIY attitude, I'd just order two replacement springs. I still might have to eventually.
Cheers!