Re: my first semi build (dump)
 

thanks guys, and thanks for the great tips Mike, although I did plan to split the roof to make up the gap in front window pillar but is was getting late last night and I got lucky with all my other cuts , so I didn't want to press my luck ;)

hopefully more to some soon, I really need to make time to work on this.

Re: my first semi build (dump)
 

next update, well in order to make this dump dump, it needs power to move the screwdrive. the common way is to hook seperate motor up to the screwdrive controlled with a second esc and channel, well I wanted to try something different, so with some ideas in my head and friends like Redbull with more ideas and tools, then me. I spend the day at Redbulls (mikes) sunday, and we worked on making a pto style system off the transmission. in order to make this work I needed to make a second shaft come out the back of the tranny. so it would provide power for my pto.

stock tranny.
http://i255.photobucket.com/albums/h...emi/563181.jpg

so the idea is that the 3 speed tranny will operate the pto, meaning I don't need another motor mounted on the truck. so order to do this, we need to make a netural gear so I can make the dump go up and down without the truck moving but I can make it go up with it in gear too. so we figured who needs third gear anyway. .

so take that third gear out.
http://i255.photobucket.com/albums/h...IMAG0024-1.jpg


now on to the fun, the shaft inside the tranny is splined so I couldn't just stick a longer rod in there to get the longer output I wanted so because I need the splines, this is what we did.
http://i255.photobucket.com/albums/h...i/IMAG0025.jpg
http://i255.photobucket.com/albums/h...i/IMAG0026.jpg

we cut the top shaft in half then we will flip the long side around , reattach the shafts with a custom made cupler so second gear lines back up, and now we have a second output out the back.
http://i255.photobucket.com/albums/h...i/IMAG0028.jpg
http://i255.photobucket.com/albums/h...i/IMAG0027.jpg
http://i255.photobucket.com/albums/h...i/IMAG0029.jpg
http://i255.photobucket.com/albums/h...IMAG0030-1.jpg

so I know you are all thinking that the shaft spins all the time so how to you stop the box from going up and down all the time.
this output will power the shaft to the screw drive but this conector shaft (pto) can be engaged and disengaged with a servo. more on that later as all the work is not done on that yet.

I know there will be a few issues and I know there might me some some cons to this setup but I wanted to try something different. and trying something different is fun, or at least that is what I try to tell my wife ;)
thanks for looking

thanks to Steve for the nice coupler he make on his lathe

Re: my first semi build (dump)
 

Wow Jason, very impressive. Thinking outside the box... That's the way to do it.

-Mike

Re: my first semi build (dump)
 

So you're gonna add a gear reduction unit between the motor & trans?

I think it's 50rpm gh motors that ppl are using for their screwdrives. The kit motor is a Johnson 15000rpm. I forget how many teeth are that 1st lower gear, is it 36? With an 8 tooth pinion that would be 4.5 to 1 or 3333rpm on that top shaft. That's pretty fast!

Perhaps an additional planetary or spur gear reduction on the back of the trans & in combo with a reduction on the front of trans with a slower (higher winding) motor will give the necessary slow speed & torque you'll require for the screw drive and slow your trk down to a more desireable scale speed?

Or is that "more on that later as all the work is not done on that yet." part yet to come? :D

Re: my first semi build (dump)
 

Nice work on the modification and clever idea using the trans to power the dump. It will be cool to see it run.:)

Re: my first semi build (dump)
 

thanks guys,

Wow Joe, you are making my head spin, :confused: you thinking way to much for me. I am not that smart. lol I get ideas try them if they don't work I try something different. I just hope someday I have a something that works. your builds and videos are pretty much what got me hooked on this rc construction stuff

and yes the "more on that later" did mean I don't have it all figured out yet;).

Re: my first semi build (dump)
 

i like that pto idea alot i think i would find a small gear reduction head off a small motor and attatch it to your pto shaft for the torque your gonna need to lift a heavy dump box of dirt or what ever your haulin awsome idea though

Re: my first semi build (dump)
 

worked on my new box sides tonight here is what I got done.

http://i255.photobucket.com/albums/h...i/IMAG0043.jpg
http://i255.photobucket.com/albums/h...i/SAM_1917.jpg
http://i255.photobucket.com/albums/h...i/SAM_1918.jpg
http://i255.photobucket.com/albums/h...i/IMAG0041.jpg

X2
http://i255.photobucket.com/albums/h...i/SAM_1919.jpg

Re: my first semi build (dump)
 

nice work - I too like the pto concept - anxious to see this one through......

Re: my first semi build (dump)
 

Great ingenuity fabbing up your box sides. http://www.modelltruck.net/images/smilies/ok.gif

A planetary drive from a small drill might be the ticket, afix it to your dump frame & run a driveshaft from the trans to it with your servo operated dog clutch somewhere in the middle.

Re: my first semi build (dump)
 

just a little update, was able work in the truck some of the day yesterday, here is what I got fabed up so far. and yes the roof is just sitting on there, I have not reattached it yet
http://i255.photobucket.com/albums/h...i/SAM_2062.jpg
http://i255.photobucket.com/albums/h...i/SAM_2063.jpg
http://i255.photobucket.com/albums/h...i/SAM_2064.jpg
http://i255.photobucket.com/albums/h...i/SAM_2065.jpg
http://i255.photobucket.com/albums/h...i/SAM_2066.jpg
http://i255.photobucket.com/albums/h...i/SAM_2067.jpg

thanks for looking

Re: my first semi build (dump)
 

Jason. She's looking more like the A Car every post. I like the way the box turned out, styrene is very tough when it's all stuck together.
Rob

Re: my first semi build (dump)
 

Jason the box turned out nice... Keep up the good work.

~Mike~

Re: my first semi build (dump)
 

Nice work .... Always loved the autocar series..... Keep it goin .....

Re: my first semi build (dump)
 

Very nice work Jason The box looks like it will take a few yards of material. I like the square fender look...
Do you get your styrene in Victoria, or do you order it.

greg

Re: my first semi build (dump)
 

wow nice job on your box you got some skills

Re: my first semi build (dump)
 

thanks guys,

Greg I buy the styrene here in victoria at industrial plastics and paints, they sell it in 2'x4' sheets, different thickiness, a full sheet was between $12 to $16 the last time I got it.

Re: my first semi build (dump)
 

What about the shaped styrene, is that at Industrial as well? I was woundering if shavers or that train store carrys it ?

greg

Re: my first semi build (dump)
 

they don't carry shaped styrene, I get that from a local guy here.

Re: my first semi build (dump)
 

thanks for the kind comments guys, well I fiinally found a little spare time last week, and I thought I would tackle a little more of the front fender/rad-grill area. here is what I got done in my limited time.
oh yeah I know the grill post are not straight as there are just stuck in there to give you the idea looks like, I still have to find a proper mesh for my grill.
http://i255.photobucket.com/albums/h...i/SAM_2079.jpg
http://i255.photobucket.com/albums/h...i/SAM_2080.jpg
http://i255.photobucket.com/albums/h...i/SAM_2081.jpg
http://i255.photobucket.com/albums/h...i/SAM_2082.jpg

thanks for looking and I know I am slow