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Big Boys of the road 4x4/6x6/8x8/10x10 Trucks This forum is for those multiple axle trucks and other vehicles on and off road.


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  #1  
Old 11-09-2014, 06:37 AM
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Default J&M Construction Mack

Well, I decided to try this funky Mack configuration.
I have a Mack dump truck that I built with a water tank (weed killer tank) that fit inside the dump body. I also am in the need for a grading dozer for the roads I am planning in the back yard. I had purchased an Ertl 1/16 JD 650H dozer to RC but the tracks didn't work out. Also got a Bruder D4 dozer to RC, but they are so light weight to be of any use, so this is what I did...
Used the stock C frame blade carrier and blade from the Diecast JD and used the outer 3/4" ends of the Bruder dozer blade. I then cut a piece of sheet Alum to create a new blade 1.5" wider than the stock Ertl. JB welded this sheet Alu to the stock Ertl blade face and JB welded on the 3/4" Bruder blade ends giving me a new blade that's 7.5" wide. I used 2 Futaba 425 ozin servos for the main blade lift. these have been stripped of the circuit board and pot internally so as I could use them without the positioning pot feedback. In doing this the servo will act sorta like a hydraulic cylinder in it's movement, hence you move the radio stick back to lift the blade, but when you return the stick to neutral the blade servo stays where it is.
I'm hoping this will make using the blade much easier than trying to hold that stick position exactly while trying to steer and use the throttle all at the same time. The angle servo is stock but set to a digital trim channel
so again I don't have to hold that stick position. The reason I didn't strip the pot out of this servo is without the feedback pot you have no holding power so the blade wouldn't hold it's angle. I'm hoping this issue won't rear it's head on the blade lift. These are 425 ozin servos, so there is quite a bit of non-powered holding power due to the gearing of these servos.
The tilt servos are stock 64ozin and I'm hoping the two's 128ozin total will be enough to hold position.
Here are some picks...
http://s222.photobucket.com/user/joh.../Mack%20Tanker
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Old 11-22-2014, 12:15 AM
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Default Re: J&M Construction Mack

I look forward to seeing a video of this working, some great ingenuity there.
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Old 11-22-2014, 02:09 PM
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Default Re: J&M Construction Mack

Thanks Joe! The wifey calls it my FrankenMack LOL Long as it works I say....
I updated my album with some pics of what she'll look like finished.
Still needing locker & steering servos, ESC, BEC and Nimh's. Should be able
to finish this build next month.

John
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Old 11-22-2014, 03:46 PM
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Default Re: J&M Construction Mack

It looks awesome John! I really like the larger single wheels all the way around. It looks like you need to stiffen up those tires though.
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Old 11-22-2014, 04:16 PM
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Default Re: J&M Construction Mack

Thanks Reg. Yeh, I've been looking for some stiffer 1.9 foams, but can't find any. The rims are aluminum, no holes, so I might try the "freeze - then glue" method of air pressure filling them. I had a feeling between having rear singles and being low profile soft tires it was going to be a challenge with this heavy truck, but they should provide good traction. Hope to see how my poor-man's dozer does soon LOL

John

John
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Old 11-22-2014, 04:29 PM
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Default Re: J&M Construction Mack

I have some foam that will work very well. Shoot me an email about it....
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Old 11-23-2014, 07:19 PM
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Default Re: J&M Construction Mack

Well guys, I don't know if they will do the trick but it's worth a shot! I will get them out to you tomorrow so that you can see if they work. They are far from perfect but at least they are kinda round. Maybe if they work we can talk popcorn flavors!


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Old 11-24-2014, 10:09 AM
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Default Re: J&M Construction Mack

Wow, that was fast Reg. They look great, hope they work.

Thanks,
John
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Old 11-29-2014, 07:51 PM
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Default Re: J&M Construction Mack

I have used some "firm" foams for a 2wd stadium truck and just cut them in half and they work pretty good
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Old 11-29-2014, 09:15 PM
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Default Re: J&M Construction Mack

JEEZ, how many times do we have to go over this?!

AIR RIFLE BB's - not foamys!

Not only stiffen the sidewalls to carry more weight, but also lock the tires to the rims without glue & the added weight is the ultimate BONUS! especially when empty.
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Old 12-04-2014, 10:30 AM
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Default Re: J&M Construction Mack

I heard about this technique,but never tried it my self,would you mind to enplane how to, and how many bb's to fill?
Thanks
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Old 12-05-2014, 07:57 PM
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Default Re: J&M Construction Mack

I know I have a pic showing a trk tire being filled, but not sure what album yr it is in. This tire is for my loader, same process using a 1/4" tube, feeding the BB's from my cupped hand. I get them stuffed as tight as I can so there is no slosh. The Pajero jeep tires I use on most my trks, the BB's add about 1lbs per tire. The regular Tamiya trk tires are a bit smaller & trickier to fill, using a small spoon vs the tube to get the last few BB's in.

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Old 02-15-2015, 01:06 PM
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Default Re: J&M Construction Mack

Quote:
Originally Posted by Lil Giants View Post
I know I have a pic showing a trk tire being filled, but not sure what album yr it is in. This tire is for my loader, same process using a 1/4" tube, feeding the BB's from my cupped hand. I get them stuffed as tight as I can so there is no slosh. The Pajero jeep tires I use on most my trks, the BB's add about 1lbs per tire. The regular Tamiya trk tires are a bit smaller & trickier to fill, using a small spoon vs the tube to get the last few BB's in.

Great tip!

What size BB's do you use and are they plastic or metal?
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Old 02-15-2015, 01:44 PM
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Default Re: J&M Construction Mack

Quote:
Originally Posted by kaptain Jack View Post
I heard about this technique,but never tried it my self,would you mind to enplane how to, and how many bb's to fill?
Thanks
I just recently tried this and filled the front tires on my dump truck. I purchased a container with 1500 BBs and just had enough to fill 2 stock sized tires.
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Old 02-17-2015, 05:37 AM
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Default Re: J&M Construction Mack

Standard copperhead or any metal BB's. Wouldn't bother with plastic, as you're after the added weight, unless you just want them to aid in keeping your tires bead locked on the steering tires (on heavier rigs the steering tires tend to walk off the rim bead on tight turns I've found)
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