rob_b hits the trails

[rob_b]

That's just the problem. I don't think that the stock piece will allow for a long enough slot. We will see, I want to draw up the whole front end to get some numbers and see if there are any easy changes that will help the situation.

[Pockets70]

Is there any way that you can make a whole new spool that doesn't need a slot?

[rob_b]

I'm not following.

[joe daigle jr]

you could always bring a set to our scale comps and I will brutalize them and see how durable they are I am only running a 6.5 turn 3400kv 550 motor in mine. hope you can make it to mini moab this sunday for the scale run,would be nice to have another twin hammers out there

[Pockets70]

Originally Posted by rob_b

I'm not following.

Make it so there isn't a slot at all, just an out drive with a grub screw into a cvd like the Traxxas outdrives. Length would have to be precise to prevent binding, but it would eliminate the need for a "dogbone" end at the diff.

[MrJugger]

Originally Posted by Pockets70

Make it so there isn't a slot at all, just an out drive with a grub screw into a cvd like the Traxxas outdrives. Length would have to be precise to prevent binding, but it would eliminate the need for a "dogbone" end at the diff.

It would be a good start for sure, avoiding the need to cut/solder part of an mip shaft for example. but it wouldn't fix the issue that the offset of the hub causes if you try to stuff something bigger than the original shafts in this thing. Replacing the outdrives with shafts having flats at their ends seems pretty easy compared to fixing the issue of the offset hub alignment. Guess that's the reason why no one came with a solution yet.

[Pockets70]

Originally Posted by MrJugger

It would be a good start for sure, avoiding the need to cut/solder part of an mip shaft for example. but it wouldn't fix the issue that the offset of the hub causes if you try to stuff something bigger than the original shafts in this thing. Replacing the outdrives with shafts having flats at their ends seems pretty easy compared to fixing the issue of the offset hub alignment. Guess that's the reason why no one came with a solution yet.

^I don't follow. Offset hub alignment? Any way you could do a quick sketch?

[rob_b]

Originally Posted by joe daigle jr

hope you can make it to mini moab this sunday for the scale run,would be nice to have another twin hammers out there

HA! You have obviously under estimated the length of time it takes me to build a truck.

Originally Posted by Pockets70

Make it so there isn't a slot at all, just an out drive with a grub screw into a cvd like the Traxxas outdrives. Length would have to be precise to prevent binding, but it would eliminate the need for a "dogbone" end at the diff.

There still has to be some sliding element. I don't think you could get the geometry to avoid axle plunge completely.

Originally Posted by MrJugger

It would be a good start for sure, avoiding the need to cut/solder part of an mip shaft for example. but it wouldn't fix the issue that the offset of the hub causes if you try to stuff something bigger than the original shafts in this thing. Replacing the outdrives with shafts having flats at their ends seems pretty easy compared to fixing the issue of the offset hub alignment. Guess that's the reason why no one came with a solution yet.

True story.

---------------------------

So I wasn't at all happy with the mock-up of the first shock tower. Moved some numbers around slightly and am going to make some of these out of 1/8" 7075. Then I'll put a few out for testing Waterjet is busy for the next week so I have to man up and cut them 100% on the mill.

[MrJugger]

You dropped the idea of the carbon inserts? Maybe I didn't followed with enough attention

[rob_b]

Yes, at least until we have a workable design.

[MrJugger]

Do you mind if I post a picture to illustrate the hub offset to Pockets? do not want to spam your thread though...

[rob_b]

I like pictures

[MrJugger]

Originally Posted by rob_b

I like pictures

Here we go then
It's quick and dirty but I think you'll get the idea.
The red lines represent the center lines of the hubs (where the bearings sit) and the blue? (sorry i am color blind ) ones the center line of the a arms.
When comparing the left and right pictures, you clearly see that on the TH the center line of the hub is offset towards the bottom and is almost at the same level, if not at than the a arms centerline. they did this to maximize ground clearance, but generates the drawback that the cvd shaft is litterally diving into the end of the arm, which makes it really difficult to fit bigger shafts without modifying the arms and hubs. look at the right and see the difference in shaft diameter...
Hope it's clear.

[Pockets70]

Got it! Thanks Jugger.

Rob- Time to mill up some arms with reliefs cut for MIP X-drive sliders. That could be the ticket to making this work. I have a mill here at work, but time is not on my side.

[MrJugger]

Originally Posted by Pockets70

Got it! Thanks Jugger.

Rob- Time to mill up some arms with reliefs cut for MIP X-drive sliders. That could be the ticket to making this work. I have a mill here at work, but time is not on my side.

Got my own mill and lathe, but as they are remote from where I live, I end up sawing, filing and drilling in my appartment lol. lack the time to spend to my workshop.

[rob_b]

That wasn't too bad. Might need go brake shopping online later tonight...

[rob_b]

Still needs work...

[kookie31]

How much for one? Very nice design

[MrJugger]

Great job rob. They really look good

[photon_trap]

Yep, exactly. We want through this with the MIP guy a while back and came to the same conclusion. More than a bit of a bummer.
Great illustration

I'm thinking that's a lot of load on those two plastic ears on the Diff case, esp in a crash

Originally Posted by MrJugger

When comparing the left and right pictures, you clearly see that on the TH the center line of the hub is offset towards the bottom and is almost at the same level, if not at than the a arms centerline. they did this to maximize ground clearance, but generates the drawback that the cvd shaft is litterally diving into the end of the arm, which makes it really difficult to fit bigger shafts without modifying the arms and hubs. look at the right and see the difference in shaft diameter...
Hope it's clear.