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  #21  
Old 03-02-2015, 04:27 PM
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Default Re: Snow Trac replacement BRONZE drive sprockets

I don't believe the hot wax would work, im thinking find out the alloy of the sprocket and size and you can figure out the amount of shrinkage. If anyone had a new sprocket ,or one that had only been run in one direction it could be traced out and the extra could be added in and the thickness can also be allowed for. In iron if i remember correctly the shrinkage was about 1/8" in a 12" piece.What is the track pitch on the snowtrac's? Don

Last edited by loggah; 03-02-2015 at 04:29 PM. Reason: pitch question
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  #22  
Old 03-02-2015, 05:13 PM
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Default Re: Snow Trac replacement BRONZE drive sprockets

that was me on J@j in Fairbanks and yes was told the building is empty
I been asking around on the patterns so far no leads
part on part will give a smaller finish piece, but this is an easy pice to cast just knowing the type of bronze you want to use and any improvements in the design you want to make,
All it takes is money and time........
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  #23  
Old 03-02-2015, 05:49 PM
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Default Re: Snow Trac replacement BRONZE drive sprockets

Base diameter is 15 3/8" (acoss the gear at the bottoms of the teeth)

Acoss the tip of the teeth, 17 1/4"

Tip center of tooth to the next tooth center 3 1/2"

Tooth thickness is 3/8"

Margin at top of the tooth is 3/4" and the space between teeth is 2"

14 teeth total, with 7 drive tabs on the inside for bolting to brake drum. (two band track) each of these has a lug on the back, so it isn't really that flat on either side.

Sure wish I had written down the % of aluminum in the alloy, but I was driving at the time I was told.
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  #24  
Old 03-02-2015, 06:02 PM
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Default Re: Snow Trac replacement BRONZE drive sprockets

Exactly, If Molds can be had I prefer to buy them or borrow them.

I have interest from the Wood Technology group where I work, they can and will create a pattern/mold. (this will take time as we are a educational situation)

according to the two non ferous foundry's near me .250 per foot is the shrinkage for Bronze. I still need the material composition. is it truely aluminized?

Maybe this project warrants its own thread. but Rben was looking for sprockets so here isn't the worst place.

Mike
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  #25  
Old 03-02-2015, 07:11 PM
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Default Re: Snow Trac replacement BRONZE drive sprockets

I just had a conversation with Gary Lemke who was the importer into the US
( He started ASV ) of the snowtracs he said he did have the mold at one point he thought but believes it's long gone. I asked how many he brought into the US
This would have been 1968,69,70,71 he thought is was about 30 or so.
Some narrow and some wide tracs
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  #26  
Old 03-02-2015, 07:11 PM
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Default Re: Snow Trac replacement BRONZE drive sprockets

Pure bronze is probably to hard and wears the grouser,i imagine the aluminum bronze comp. is easier on the tracks.
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  #27  
Old 03-02-2015, 07:17 PM
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Default Re: Snow Trac replacement BRONZE drive sprockets

I want to say it was 20% aluminum, but I just cann't say for sure...

Is 20% a workable alloy?

Regards, Kirk
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  #28  
Old 03-02-2015, 07:56 PM
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Default Re: Snow Trac replacement BRONZE drive sprockets

I should be receiving a call from someone that worked at the foundry to find out if the mold is available in the next few days
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  #29  
Old 03-02-2015, 08:02 PM
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Default Re: Snow Trac replacement BRONZE drive sprockets

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Originally Posted by 300 H and H View Post
I want to say it was 20% aluminum, but I just cann't say for sure...

Is 20% a workable alloy?

Regards, Kirk
Most likely 5-11% this is what some bearing bronze has in it
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  #30  
Old 03-02-2015, 09:11 PM
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Default Re: Snow Trac replacement BRONZE drive sprockets

bearing bronze is what they were using at north poll I believe there was some nickel in theirs too as they were a darker color and advertised to wear better than the oem stuff was
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  #31  
Old 03-02-2015, 11:09 PM
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Default Re: Snow Trac replacement BRONZE drive sprockets

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Originally Posted by boggie View Post
Most likely 5-11% this is what some bearing bronze has in it
I kept thinking 1/5 or 20%... But maybe it was that I was remembering the 5 and it was 5%, and that could be...

If I remeber correctly isn't there a hard and soft bronze bearing material? The harder stuff you need to grease it when wearing on a steel shaft. The softer material you don't need to grease to keep it from wearing on the shaft, even without grease. I coud be wrong about that...

These J&K castings are quite yellow more like the color of brass btw. I've had them for several years, and they don't seem to darken with time, in the corner of my shop anyway.

Lets hope the mold is avalilable, and your able to secure it.

Regards, Kirk
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  #32  
Old 03-03-2015, 12:07 PM
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Default Re: Snow Trac replacement BRONZE drive sprockets

jims sprockets were dark just like nickel bronze welding wire
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  #33  
Old 03-05-2015, 08:31 PM
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Default Re: Snow Trac replacement BRONZE drive sprockets

I need to check through my "book" but I am fairly sure these are silicone bronze- much harder and more durable than bearing or aluminum bronzes.
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  #34  
Old 03-06-2015, 02:19 PM
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Default Re: Snow Trac replacement BRONZE drive sprockets

I think you are right I believe he called it that not nickel bronze.
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  #35  
Old 03-06-2015, 08:28 PM
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Default Re: Snow Trac replacement BRONZE drive sprockets

when I bout mine I ordered 5 . one just incase something like this happened. he called them silicon bronze and told me to use that wire to weld on them.
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  #36  
Old 03-06-2015, 09:35 PM
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Default Re: Snow Trac replacement BRONZE drive sprockets

I was talking to one of my favourite welders here in town about the idea of TIG welding repairs and she told me about another fabricator who has been doing some small scale casting and foundry work. I am meeting with him next week to look at patterning a drive sprocket. He said silicone bronze is a more advanced casting metal and has a narrow temperature window and is prone to casting shrinkage and voids if overheated... and since the pattern I am bringing him shows signs of being hot and has shrink voids, I am looking forward to seeing what he has to suggest :) The new alloys are actually harder than the old silicone bronzes and he did not think this would be an issue with old ( not easily replaced..) grousers.
Will let you know as things develop.
Jim I will PM you about possibly getting some pictures of your "new" sprockets as mine are worn on both sides and it would be good to have some measurements to properly "clock" the drive teeth.
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  #37  
Old 03-06-2015, 10:16 PM
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Default Re: Snow Trac replacement BRONZE drive sprockets

Quote:
Originally Posted by JimVT View Post
when I bout mine I ordered 5 . one just incase something like this happened. he called them silicon bronze and told me to use that wire to weld on them.
And yours are from were? Are they J&K from North Pole AK.?

You bought yous before I bought mine. But I was thinking those you have were from a thicker mold that Lyndon had??

Details please

Regards, Kirk
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  #38  
Old 03-06-2015, 11:56 PM
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Default Re: Snow Trac replacement BRONZE drive sprockets

Manganese bronze. Cu55%+,Zn 38%+, strong and tough used for landing-gear and tail-skid castings, Tensile strength 65000 psi, shrinkage 1/8 to 11/64 in/ft (range for Al and Mg) Hard Bronze SAE Standard 62, Cu and Tin mostly-Good for severe conditions and heavy pressure, used for gears and bearings. Tensile=30000 psi and then Phosphor Bronze.(Cu, Sn, Pb) Resistant to wear and scuffing. Tensile 30000 psi and then there's Cast Aluminum Bronze SAE Std 68. Used in gears,etc. Tensile as-cast 25-50000 psi (2 grades). All this sounds like a job for an experienced Foundry man. It would be fun to draw it, print it and CNC the pattern on a mill(and make the teeth wider maybe). Damn I can almost see that dream shop from here.
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  #39  
Old 03-06-2015, 11:58 PM
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Default Re: Snow Trac replacement BRONZE drive sprockets

I bought 5 from north pole and are stock ones . But the mold he had has the centering tabs moved or changed some. He told me this when we talked on the phone.
It had something to do with the fitting when they made the mold. I wished I knew what machine they were working on.
The inside centering tabs were 1/8 inch to small for the rubber covered ice drum.
The drum fits loose over them.
So I welded a bead on top of each tab that holds the drum.
It works ok.
It is a little more work but an easy fix. It was Easier than drilling the holes in them.
I also have a set of the heavy brass and other worn out ones. I collected them from my friends years ago and was going to build something.
jim
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  #40  
Old 03-07-2015, 02:17 PM
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Default Re: Snow Trac replacement BRONZE drive sprockets

Does someone have some shots of the various stages of sprocket wear? The good, the bad and the ugly? Just about to start on an EcoTec conversion of our 1959, seeing the success Louis has had.
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