Great Dane excavating co.

[Mikem]

The dog pic was me when I impacted the ground from 8 feet up and then at the hospital when the doc said I broke 4 ribs . Cooper sorry for putting this on your thread . Mike

[9W Monighan]

Originally Posted by Cooper

Yeah, I see the possibility of a reprimand. Lol!!!

And yes this isn't on the cheep side. I did look at other materials but longevity won out. And went with this type. I really didn't spent much time with the part prior to making the mold. Figured equipment tire a few blemishes,,,,, I think I'm going to start working on a two piece rim and the axle next. Figure if a design change needs to happen better not make them all. I'm trying to make the weight of the truck on the axle and not on the motor shaft. Like a post of joes when he was building the adt. Any idea where to source 1 1/2 I d bearings that are not much bigger on the o.d.? And cheep?

For thin bearings, try looking here: http://www.ebay.com/sch/i.html?_from...earing&_sop=10



.

[JAMMER]

Very nice job Cooper. You can fill the imperfections with some black silicone. Ed

[TRUCKMAKER]

Coop that tire is excellent! It can only get better from here! Color isn't bad especially if more pigment will start messing with the rubber.

I definitely like SuperGirls paint job!

[Cooper]

Thank you fellas!! Got home and found a big box on porch. Figured it was for wife. Found my name on it and was surprised as I only had one thing coming in mail and it wasn't going to be here till Friday. The box looked really big for the small 1:50 diecast truck I got. Figured they went nuts with packing peanuts. Was surprised to actually get a side by side eye on how big my next project is going to be.

[bigford]

the kill dozer just got small!!!

[FabOne]

GREAT job on your tire! SUPER first run.

=Terry

P.S. Check your PM's

[modelman]

Cooper-your first tire looks good. You probably don't need my advice but I will offer a bit of what I learned in this process. I see a little air and this will be a small problem but I noticed one of your vent holes may not be on the highest point of the tire but I could not see all of them. That could be some cause for air. Also I think you will have a better chance of getting the air out if you keep the mold level in both directions when you are close to being full. Another thing I found was to not fill the vent holes. Just let the rubber barely get into the vent holes and the air still has a chance to escape. Also, if you have the working time, stop for a few minutes when it is about 90% full and let the air escape. Then finish filling it up. One other thing I found that saved a lot of time was to leave the mold open and pour the bottom half almost full then attach the top mold and finish filling.This will take a little practice but I'm sure you will get it right.

[RCP57]

Keeping with the topic of big pink silicone things. I have to wonder if a little vibrating motor would help to disperse the bubbles or would it make things worse? I'm not talking paint shaker here but just a little gentle vibration to help settle out the bubbles...

[bigford]

oh like a mfu shaker unit !!

[RCP57]

Yeah maybe not even that violent. Just a gentle vibration to get the juices moving. Rub-a-Dub has been pretty quiet for a day now so my guess is he will be back tonight with 6 perfect tires.

[Mikem]

But where is the picture of the tire ? Mike

[bigford]

Originally Posted by Mikem

But where is the picture of the tire ? Mike

knowing ralph already mounted to the axles

[TRUCKMAKER]

Originally Posted by Mikem

But where is the picture of the tire ? Mike

Mike- Go back 2 pages to post #1093.

[Cooper]

I should have more material to make another one in a couple days. This time I got enough to make one with a hardness of 40, first one is 60 comparable to sneaker shoe. The 40 is comparable to wine cork. And I'll add a lot more pigment. Originally I figured two learning parts till I get one right. More of trying to figure out how soft I can make them. and if the first two "test" tires don't make the cut maybe another project, worlds largest 1:14 scale motorcycle!?!


As far as the casting, this stuff has a pour time of 5 min. Sounds like plenty but mixing, degassing, and then pouring slowly, it starts to set up quick. It's not completely necessary to degass (vacuume) and that may give me more pouring time. I think what is happening is the material is starting to thicken while some of the bubbles are still rising. And the air has been introduced from the pouring into mold. I do t think I have enough time to pour half set mold top and box up before it thickens. But quick mixing and not degassing will keep it thin and hopefully that will allow any poured air to escape. And I did cut bigger vent holes on the two small ones. It's easy to grind the casting plugs flush so I would rather do that than have to fill big pockets. And they will always be on the non visible side anyway. So a couple days more before test number two. And then I should know what to get for the production line. If this stuff were cheaper I would have gotten enough of both and been done by now!!!

Oh and reg, I'll go check on that aeromax now, keep forgetting to , or getting sidetracked with all this silicone implanting , I ment casting stuff

[Supermario]

speaking from having absolutely no experience or knowledge about making tires,
instead of pouring the material into the mold. ( which I'm thinking is the major cause of air bubbles) is there a way to pump the solution into the mold from the bottom of it, or the "good side" and then trim the fill port when done?
No pouring, no air?..... Just saying....

[speedy8305]

So lemme get this right Cooper your doing silicone implants ?lol

[speedy8305]

Well Mario if Cooper had an factory then a injection machine might be ideal but I think he is doing great job and from the first test it looked like there weren't too many air bubbles I could be wrong though
But your idea is a good one as well

[Krewmember]

Originally Posted by Supermario

speaking from having absolutely no experience or knowledge about making tires,
instead of pouring the material into the mold. ( which I'm thinking is the major cause of air bubbles) is there a way to pump the solution into the mold from the bottom of it, or the "good side" and then trim the fill port when done?
No pouring, no air?..... Just saying....

Sort of like low pressure injection molding factory made rc tires probably use some kind injection molding. so you may be onto something there.

[bigford]

so instead of a $5000 dump truck cooper into it for $105,000.

keep plugging away r-dub and watch this
https://youtu.be/QC5xzmeYP74