Author Topic: Repair of hook switch cast mount on Compact Kellogg Phone  (Read 1011 times)

Offline Landshark

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Repair of hook switch cast mount on Compact Kellogg Phone
« on: May 08, 2016, 02:50:39 PM »
Working on an old 1903 to 1909 Kellogg Compact wooden phone Model 2062.  The hook switch mount was broken in 3 pieces.  Looks like air bubbles in the cast so poor quality from the factory.  The mount is a metal cast, it is not attracted to a magnetic and is of unknown material, but definitely metal. It is under a lot of tension as the spring is still very strong.

I tried JB Weld two part epoxy and backed that up with a quick set two part steel putty, left it for 24 hrs and it failed.  I must admit I forgot to clean the joints with an alcohol.  The problem is the small contact surface in which to glue.

I am considering

1)Using a normal plumber's solder.
2) Gorilla Glue two part epoxy
3) Some mechanical clamp.

I did test the Gorilla glue on two washers and I cannot get them apart after only 12 hours of cure.  Very strong.
I also soldered with 60/40 rosin core solder using flux and electric soldering gun two metal pieces together and again can not break them apart with 50 lbs of force.

Attached are the pieces, I am going to clean them up with my Dermal and clean with Improperly Alcohol 99%. 

Does anyone have any other ideas on attaching these 3 pieces back into one? 

thanks

Bob

Victor Laszlo

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Re: Repair of hook switch cast mount on Compact Kellogg Phone
« Reply #1 on: May 08, 2016, 10:06:54 PM »
Glue and clamp until the parts can hold themselves together. Then have someone make you a new piece, either by casting or using a 3D printer. It can be done. Just takes time and patience.

Offline Landshark

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Re: Repair of hook switch cast mount on Compact Kellogg Phone
« Reply #2 on: May 09, 2016, 09:15:17 PM »
Thanks Victor for the suggestions, as this small part is likely pot metal, it will be difficult to fix.  I could get a cube of aluminum and file it down to replicate the original.  Funny you should suggest 3 D printer.  Our local library just bought a cheap one for $1000.  But it only does plastic, plus I would need autocad or some other drafting program to then feed into the 3D software. 

Anyway, I am cleaning the bits much better this time and have bought Permatex Steel Weld, rated at 4500 psi (two part metal epoxy).   I'll give that a try backed up with steel 2 part epoxy along the sides to strengthen. I may just secure with a hose clamp and leave it there, will not look pretty but will work. 

I need a junk Kellogg Phone Model 2062 1903-1909 anyways because the small cog wheel that is turned by the big generator wheel is almost stripped of it's spines and it is always slipping when I turn the crank.  Anyone have a spare?

Will let you know how the repairs go after 24 hours of cure time.

Bob