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#1
10-23-2015, 03:44 PM
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Re: Great Dane excavating co.
those tyres are looking awesome, just a thought in the moulding process.
I don't know what you guys call them over there , but we call them pool noodles. once you make the mould , if you were to glue the foam pool noodle to the centre hub and then cast the tyre you would use less rubber and also achieve a hollow tyre that you could then fit the air valve.. now that would be cool! cheers andy 
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#2
10-24-2015, 09:02 PM
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Re: Great Dane excavating co.
  Had some home time this evening and made two round blanks to ride in the bead area of tire. The bolt holds them together. The reason I did this is I'm going to use the acetone vapor bath to smooth any lines out. From past experiences in this the bottom always seems to get more of the vapors. As I only have done acetone in bucket ( bottom liquid and soaked towel on top, both techniques) this time I have a electric heat plate to vaporize acetone but still want the ability to invert wheel half way through process. If I knew what I was doing things would not be so stressful as a good bit of time involved in this so far and if I melt it I'll be ,, well we all know how that works!!! Lol!!!
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#3
10-24-2015, 09:09 PM
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Re: Great Dane excavating co.
Andy I have thought about displacing some material with cheeper means on the inside of tire. That may be a bit more advanced than I've got yet. That would really require a three part mold. As the mold part on the inside of tire would have to be secured/suspended during casting and then on removal from mold a three part would be better (I think)
 . And they may be a little bit more casting material but it will also end up more added weight. I would imagine each tire will be weighing around 2-3 pounds. Just a uneducated guess right now. I'm not even sure the casting resin I am getting is the right hardness. Won't really know till I make one . I'm shooting for a shore hardness of 60 that should be like a sneaker bottom. Softer than a super gummy tire.
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#4
10-24-2015, 09:13 PM
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Re: Great Dane excavating co.
Oh and some good redneck engineering=== metal 5gallon bucket with a puddle of acetone in bottom, electric hot plate for a nice gentle heat source to vaporize acetone, all in a toasty garage with open flame gas heater on wall!!! What could go wrong? I guess I should record the process
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#6
10-24-2015, 09:33 PM
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Re: Great Dane excavating co.
Quote:
 yes Cooper heavy haul tires, new market they are getting into. a tire company that makes mining equipment!!!! Smarta$$ 
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#7
10-24-2015, 09:38 PM
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Re: Great Dane excavating co.
Cooper-your tire plug looks good. Have you decided how you will mold it? After I made mine I figured out a way to make it in to equal halves by using one mold. Make the mold come to the exact centerline of the tire, then pour that part and let dry. Then remove it from the mold and pour the other half and drop the cured half on top while it is wet and the tire will be bonded together. You will need a "key" on the tire and mold to line up the 2nd. half but it should work. If you do it this way you will need a leveling table to have the mold exactly level when pouring. BE CAREFUL WITH THAT ACETONE!!!
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#8
10-24-2015, 09:56 PM
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Re: Great Dane excavating co.
Quote:
. The way I'm planing on making the mold is to fabricate a mold box, elevate tire enough for second half mold, fill in with clay up to centerline of tire. That is also why I decided on this tread profile with center flat. Pour mold material. Possibly pour a hard mold support on top of that. Flip over, remove clay, clean up any water based clay residue, pour second half with fill/vent spouts. Probably 4 around sidewall of tire. That side will always be the inside of truck. And tire is unidirectional. So any flashing should be at flat centerline of tire that will be easy to clean up and on back of tire. At least that is the plan. I've been watching a few mold and casting videos and that looks like the best way to go. (Again , I think)
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#10
10-25-2015, 01:53 PM
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Re: Great Dane excavating co.
   That was my home cooking station. Couple ounces of acetone heated to around ? Boiling off point. Had to make a little stand. Bathed for about 1-1/2 min. The one pic shows a drip of acetone condensation that was on alum when I flipped it over and ran. I'll sand that down. Have to bathe it once more for other side. I was using a plexiglass lid to watch the melting up the side of tread. Don't know what I'm doing so I figure I can always do more than having melted it too much. Had the fan on low and garage n window open a bit then completely aired out. Still a bit of fumes. I should have asked some of the locals in town to do it, they would have enjoyed the fumes and slight headache following more than me
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#11
10-25-2015, 05:35 PM
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Re: Great Dane excavating co.
Sanded it on the lathe this time and cooked again. Came out fairly well. Should be good enough for me
   Going to let it dry overnight to completely set up any soft material. There are some minor imperfections and I'm not sure how they will show in a cast part. But like I said I have no idea of what I'm doing so I'll just have to wait till a final product. At least I didn't over cook it and have to start over!!!
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#13
10-25-2015, 05:54 PM
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Re: Great Dane excavating co.
Quote:
oh and the wife just got home from a dog Halloween party. She was giving me stuff for not blowing up house with vaporizing acetone while she used hair paint on the dog , in the house, that stuff is butane based!! I walked inside the hose earlier and just about fainted!!!!
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#14
10-25-2015, 07:24 PM
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Re: Great Dane excavating co.
Cooper, I'll ask you to go back and read the last line on your post again and then I'll ask you, if that stuff didn't affect you a little more than you though!!! LOL!!!
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#15
10-25-2015, 07:29 PM
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Re: Great Dane excavating co.
Quote:
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#16
10-25-2015, 09:53 PM
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Re: Great Dane excavating co.
Cooper-what you have so far looks really good. On molding, any imperfection in the tire will show up in the mold and on the molded part. But it is just a "dump truck tire" so I wouldn't be too concerned. The building technique you described is similar to what I did but I found by pouring the complete tire there will be problems with air. I even used a shaker table and still could not get all the air out but it was very minor and I turned that to the inside. The way I described the half mold idea will eliminate the air problem but I am sure you will work it out. Keep working!!
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#17
10-25-2015, 10:19 PM
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Re: Great Dane excavating co.
I have not completely decided what method I'll do yet. One thing I have going is the highest part of the tire will be the sidewall. So doing something like yours I'm hoping to minimize air bubbles. And like you said that will be the back side. I even thought of having the mold at a 45 angle but that may make two of the treads capable of trapped air. Have to do a bit more knowledge searching
. And that's my opinion on the imperfections, I thought about using a high build primer but I don't want to get any in the treads as they are not the easiest to sand and that's what the acetone flattened out. Once some real dirt gets on um I'm hoping they will blend right in. None of my stuff stays pretty for too long I'm trying to get some pics of the frame that I can accurately scale off. This may change to a 785d, I can get one of the norscot die cast models. Anout the only difference I found so far is front end appearance. And those little models are pricey little buggers!!!! Have to go to the local cat dealer with the d11 and excavator, maybe they will sell me one cheeper. They don't get any trucks that size and biggest dozer they get in the lot is usually d9. Lots of adt trucks. But they have most of the toys, probably the 797 and not what I need. Everyone around has been telling me to take the toys up there anyway.
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#18
10-26-2015, 07:01 AM
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Re: Great Dane excavating co.
HI Cooper if you are casting your tire horizontally why don't you put vents in the high part of the tire and then clip them of . I used .040 wire and my parts looked like a porcupine but it did get 99% of the bubbles out . The other thing we did was to put compressed air in our pressure pot about 60 psi . We also had the fill bigger so a little more resin would go where the bubbles were . Hope that helps . Mike
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