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Snowcat Restoration & Modification Projects Forum Major Restorations, Upgrades, and Non-Stock Snowcat Modifications

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  #21  
Old 05-15-2013, 09:07 AM
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Default

That dash panel came it looking really good, hope to see in the woods sometime.


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  #22  
Old 05-15-2013, 09:12 AM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

Wow. Very nice.
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  #23  
Old 05-15-2013, 11:45 AM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

how did you do the lettering for your switches that looks good
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  #24  
Old 05-15-2013, 01:07 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

I use AerogGraphics in Loveland Colorado. www.aerographics.com Ph 1-800-336-9633. They specialize in aircraft graphics but can do anything you want. Call them and they will send you a catalog.
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  #25  
Old 05-15-2013, 01:51 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

did you buy the lettering from them or did you have to send out the panel if I could get the lettering I'm interested if the panel has to go well I will have to do something else.
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  #26  
Old 05-15-2013, 04:24 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

Just tell them what you want, and they will mail them to you. They are self adhesive and easy to apply. I had mine in a couple of days.
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  #27  
Old 05-15-2013, 05:11 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

Awesome Job!
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  #28  
Old 05-17-2013, 11:20 AM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

I second the lettering comment. Where can I get that for my dash next year?
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  #29  
Old 05-17-2013, 09:33 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

Aerographics in Loveland Colorado. www.aerographics.com They are self adhesive and easy to apply.
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  #30  
Old 05-17-2013, 11:33 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

Before I rebuilt the tracks I had to make 3 new grousers since this cat had 53 on one side and 54 on the other. The parts list for the 1402 shows that there are 55.

The originals are made from 3/4" X .095 square tubing. I couldn't get .095 so I had to use .120. I used the old blacksmith heat and beat technique with a stock grouser as a pattern.

All of the grouser clamps were also pretty chewed up so I made new ones from .187 X 1" 6061 T651 flat aluminum bar. There are 220 of them. After cutting to length and drilling, I ran a bevel mill down the sides of all of them to conform to the inner radius of the belt as it goes around the sprocket and idler.

In the next post I will go over how I calculated the belt length and rebuilt the tracks
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  #31  
Old 05-18-2013, 01:49 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

turbinator you can't be married no way a wife would let you play in the shop that long with out wanting you to do stuff around the house.
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  #32  
Old 05-18-2013, 02:41 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

Yep. 25 years now. The thing is, she never has to worry about a toilet that doesn't flush or a sewing machine that doesn't sew. I keep everything working. Plus a trip to Hawaii once a year.

I'm off the snowcat this weekend though - social obligations.
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  #33  
Old 05-19-2013, 07:19 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

I finally ran out of excuses not to work on the tracks. I have been putting it off until I had a workable plan.

My old tracks were about 213 3/4 inches long. One track had 54 grousers and the other had 53. They also ran vey tight on the idler even with the idler at it's rearmost position.

I was pretty sure that the pitch of the grousers was 4 inches but I wanted to be certain.

To calculate the grouser pitch (laying flat) you need to know the minor diameter of the sprocket, and the drop distance of the grouser.

My sprocket is a little over 17.6 inches diameter at the tooth root and the grouser drop is about 1.125" . So 17.5" - (2 X 1.125") = diameter at the outside of the belt = 15.35" Multiply this times PI 15.35" X 3.1416 = 48.22" for the circumference at the belt outer surface. Divide this by 12 teeth = 4.018" Close enough to 4" for me. You can also see that the circumference at the root diameter of the sprocket would be 17.6 X 3.1416 = 55.29" Divide this by 12 teeth and you get 4.6". This would be important to know if you were going to use a straight grouser on this sprocket. The drop center grouser has a pitch of 4.6" as the drop portion spreads apart as it goes around the sprocket, but is only 4" at the surface of the belt.

The second part of the problem is to determine how long to make the belts.

The parts manual for my 1402 says that the track has 55 grousers. So 55 X 4 would equal 220 inches. But I want to have a second means of verifying that before I cut my belting.

From the above I know that the circumference at the outer belt surface is 48". The belt only goes around half of that so that distance is 24". The same thing needs to be done for the idler. My idler is 12" in diameter. 12" minus 2 X the drop of 1.125 = 9.75" Multiply this times PI for the circumference. 9.75" X 3.1416 = 30.63" Divide by 2 for the belt wrap distance. 30.63 divided by 2 = 15.31"

The total belt length will be these two numbers plus 2 X the sprocket to idler center distance. My center distance with the idler at it's center position is 90 inches. So 2 x 90" + 15.31" + 24" = 219.31". That is very close to the 220" calculated from a pitch of 4" times 55 grousers and within the margin of error.

Now my head hurts!

The belt will be 220 inches overall minus the lacing length of 5/8". So the cut will be at 219 3/8"

The next post will cover the drilling and assembly of the tracks.
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  #34  
Old 05-19-2013, 10:38 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

I see you are a math wiz too glad some one likes it I had a hard time with it. I now know who to contact when I need to use math. your pitch turned out to be a small amount more than the 4 inches you called for. with new belts having your pitch a little tight will be a good thing, because as the belts stretch your pitch will also spread out closer to that 4.18 you came up with.
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  #35  
Old 05-20-2013, 12:30 AM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

The actual flat pitch of drop center grousers is not as critical as it would be with straight grousers. Drop center grousers will rock and adjust (within limits) to the root of the sprocket as they go around it as long as the track is tight. Straight grouser pitch must be very close to the sprocket pitch or they will ride up on the sprocket tooth sides with the potential to jump a tooth.
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  #36  
Old 05-20-2013, 01:11 AM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

good point never thought of that
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  #37  
Old 05-20-2013, 07:21 AM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

Very nice work on your 1402.
Sorry I'm late to the party or I'd have posted sooner. I went through much of what you did on my 1402 about 2 yrs ago, ended up with 55 grousers on mine as well.
http://www.forumsforums.com/3_9/showthread.php?t=46353
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  #38  
Old 05-20-2013, 10:28 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

Before I could finish the tracks I had to make two more grousers. I had made one already and knew it wouldn't be fun.
I used a length of 3/4 by .120 square tubing and bent it using a torch to heat it to cherry red. It was progressively bent to match the contour of an original grouser. After bending I cut them to length and bent up the shoes from 1/4 X 3/4 flat bar. These were then tig welded to the bottom of the grouser. After drilling the mounting holes I bent up the tire guides from 3/16 X 3/4 flat bar and welded them on. The tire guides need to have a rounded top surface so I contoured them with an angle grinder and finished them with a flap sander. Voila! Two new grousers. I'm glad I don't have to make more! It took me about three hours including cleanup. Foundry work is not my favorite.

Next post will be assembly of the tracks.
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  #39  
Old 05-20-2013, 10:56 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

Track assembly. Maybe I can finally get this thing back on the ground so I can move it.

After cutting the belting I used Flexco #45 alligator lacing. That is what was on the original tracks.

I followed the instructions in the lacing kit with the exception of using pliers to squeeze in a couple of prongs to hold the lacing in place so it wouldn't shift while it was hammered in. There is a rod that is used to keep the lacing from getting crushed while being driven. The first step is to drive it from both sides on a wooden block, then finish it on a steel plate or anvil. This will also peen the ends of the prongs slightly like a rivet to prevent them from coming out.

When doing the second end, make sure the lacing is positioned so the sides of the belt ends are aligned and to make sure that the lacing will align on both sides when the grousers are installed.

After measuring and marking the belt for drilling, I used a rotary punch I purchased from the belting company which worked real well. It is important to lube it with soapy water so it doesn't get hot. Don't use oil, that is not good for the rubber.
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  #40  
Old 05-20-2013, 11:23 PM
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Default Re: The continuing saga of Niksons 1402 IMP sn 129

Final assembly finally!

The belts were measured, marked and drilled. I assembled them on a table with all new grade 8 hardware and new grouser clamps. This part actually wasn't too bad. It was nice to be able to stand up while doing the job but it still took about 5 hours. Thank God for electric impact drivers.

After assembly I mounted them on the cat. Those suckers are heavy! I can do it by myself but tracks for a bigger cat must be a real chore. Everything lined up well. Tension looks ok I think. The idler has a little bit of squish with 50 lbs of pressure in the tire. Both sides look the same. I think it is good to go!

I have to take a couple of days off from the cat to do a test and calibration run of a turboprop engine for an old customer. Then we will be at the cabin for a week.
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