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Portal axles?
- Thread starter Damatheus
- Start date
willyg1981
Quarry Creeper
The only way it would work would be from a solid axle as the portal attach to the ends of the casings and obviously the TH has ifs so I would say no !
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willyg1981
Quarry Creeper
What would be the point of having it on the back and not on front lol
unless your planning on driving the rig in reverse , also this application may work in the real world scale but in 1:10 scale where strength is reduced because the scale design and limited by tooling the portal design is just not feasible price wise and longevity of design prone to damage , every 1:10 scale is limited to the solid axle , don't get me wrong I would love to see this on the market but it's just not available unfortunately [emoji106]
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unless your planning on driving the rig in reverse , also this application may work in the real world scale but in 1:10 scale where strength is reduced because the scale design and limited by tooling the portal design is just not feasible price wise and longevity of design prone to damage , every 1:10 scale is limited to the solid axle , don't get me wrong I would love to see this on the market but it's just not available unfortunately [emoji106]
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The trx4 is doing it successfully, and it seems the kits for the other rigs are successful.
Of course I didn't mean do it on the rear only, just saying it's possible to do on the rear already, and with some creative engineering and a 3d printer bit could be done up front.
I was curious if anyone had ever seen it.
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Of course I didn't mean do it on the rear only, just saying it's possible to do on the rear already, and with some creative engineering and a 3d printer bit could be done up front.
I was curious if anyone had ever seen it.
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willyg1981
Quarry Creeper
Yes the trx4 axle is very impressive but again this is solid and not independent , this is the Hum vee front end and as you can see is seriously complex , can you imagine trying to miniaturise this and produce it so it's relatively a universal component available to most platform and within a price range which is affordable to most hobbyist ??? This is why it's not available , also the amount of ball joints that would be needed which is literally unheard of in 1:10 scale
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Oh yah, I understand how complex it is. It may be possible to adapt some of the solid axle kits to the front of the TH. The steering knuckles aren't that different from their solid counter parts. Mad moose makes a kit that looks like it may be close.Yes the trx4 axle is very impressive but again this is solid and not independent , this is the Hum vee front end and as you can see is seriously complex , can you imagine trying to miniaturise this and produce it so it's relatively a universal component available to most platform and within a price range which is affordable to most hobbyist ??? This is why it's not available , also the amount of ball joints that would be needed which is literally unheard of in 1:10 scale
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But you are right, it's very specialized and expensive and not something normally sought.
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willyg1981
Quarry Creeper
It is a beautiful piece of engineering though and I would genuinely love to see someone release a kit for ifs [emoji106]
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willyg1981
Quarry Creeper
I was sold straight away on the trx4 purely on the portals alone lol and then realised it had lockable diffs !!!! That is the most complex piece of 1:10 engineering I think Iv ever seen , then again there are those amazing miniature v8's and I'm sure you know the price of those ! So hats off to traxxas for these amazing creations [emoji16]
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Technically it wouldn't take anything more then making a new set of C hubs for the independant suspension that took the TRX or MST portal housing. The axle is already connected by a CV joint.
It would take no more ball joints then a normal 4wd rc car would take.
Just because it has not been done does not mean it could not be done, it just means companies like staying in the safe area of tried and true and accepted technology.
If you want portals on your Twin Hammers you are going to need to do a bit of work, decide what brand portal you want to start with, then make an adapter C hub to fit that in place of the stock knuckle. Someone good at can should easily be able to draft up a portal adapter for the Twin hammers.
The axle will be the fun (hard) part, you will need to find one that will fit in the CV port of the portal and the dogbone end of the twin hammer... I can see some brazing or welding in your future.
Edit: Although I should say... a reason you won't really use them on an IFS vehicle is, well, the diff already is out of the way of the ground making a portal just extra weight. The suspension action makes portal superfluous.
It would take no more ball joints then a normal 4wd rc car would take.
Just because it has not been done does not mean it could not be done, it just means companies like staying in the safe area of tried and true and accepted technology.
If you want portals on your Twin Hammers you are going to need to do a bit of work, decide what brand portal you want to start with, then make an adapter C hub to fit that in place of the stock knuckle. Someone good at can should easily be able to draft up a portal adapter for the Twin hammers.
The axle will be the fun (hard) part, you will need to find one that will fit in the CV port of the portal and the dogbone end of the twin hammer... I can see some brazing or welding in your future.
Edit: Although I should say... a reason you won't really use them on an IFS vehicle is, well, the diff already is out of the way of the ground making a portal just extra weight. The suspension action makes portal superfluous.
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willyg1981
Quarry Creeper
I'm not saying it's out of the question
it's just a very detailed and complex design to achieve and obviously cad design and tooling is seriously not cheap , if YOU can do the designs then great that gets the price down ,
I haven't said it can't be done it's just not financially practical and also the question was is there a portal axle available off the shelf , were know moving into the discussion of diy portals and of course this is much in the hands of how competent the hobbyist/ machinist is ,
And yes as clm mentions it does become a bit of a waste if the diff is already out of the way , all that said it does look cool and would achieve even more ground clearance !
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it's just a very detailed and complex design to achieve and obviously cad design and tooling is seriously not cheap , if YOU can do the designs then great that gets the price down ,
I haven't said it can't be done it's just not financially practical and also the question was is there a portal axle available off the shelf , were know moving into the discussion of diy portals and of course this is much in the hands of how competent the hobbyist/ machinist is ,
And yes as clm mentions it does become a bit of a waste if the diff is already out of the way , all that said it does look cool and would achieve even more ground clearance !
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The answer is cad and 3d printing. If you can measure the existing portals and your existing c hubs a competent enough person using freeware software should be able to make something they can have Shapeways print and mail them that will bolt directly on. It might take a few tries to get tolerances right. But with 3d printers strange ideas like this are getting even more possible then BITD.
And before you ask, I personally have never drafted up something like this in a cad software but there are many threads throughout many different forums that have for RC's.
willyg1981
Quarry Creeper
To be fair after just watching a taredown of the trx4 on YouTube that josh has done I'm coming round and yes it most definitely is possible , I have a twin hammers and would like to have a go at this myself as it doesn't look that difficult really to fab something ourselves ,
Do shapeways 3D print in aluminium or is it just plastic ? I suppose once you have the initial plastic c hub master then this can then be used to cad the finished aluminium piece if shapeways don't do metal ,
Using the trx4 portal will most definitely be a lot easier than going down the completely one off bespoke line though .
Does anybody have the dimensions of the cvd axle from the trx4 , I'm thinking just cut the cvd drill through the dog bone cup and braze in place with a little bit of precision this may be quite easy .
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Do shapeways 3D print in aluminium or is it just plastic ? I suppose once you have the initial plastic c hub master then this can then be used to cad the finished aluminium piece if shapeways don't do metal ,
Using the trx4 portal will most definitely be a lot easier than going down the completely one off bespoke line though .
Does anybody have the dimensions of the cvd axle from the trx4 , I'm thinking just cut the cvd drill through the dog bone cup and braze in place with a little bit of precision this may be quite easy .
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I don't have the TRX apart at the moment, but I would have to imagine you could splice and braze the TRX axle to the Vaterra axle using a bit of tight fitting brass tubing from a hardware store...
The big issue you are going to run into is you will also have to put these portals on the Vaterra axle in the back, you can't just swap a TRX axle on as a complete unit as the diff ratios are off. You need to keep the ratios between the front and rear final drive close... (and reverse the rotation of the Vaterra motor but that's easy)
But then again you might go for the slightly more complex MST CFX-w portals as they would not need to reverse your motor, and therefore are actually better then the Traxxas ones that required a reverse rotation motor.
The big issue you are going to run into is you will also have to put these portals on the Vaterra axle in the back, you can't just swap a TRX axle on as a complete unit as the diff ratios are off. You need to keep the ratios between the front and rear final drive close... (and reverse the rotation of the Vaterra motor but that's easy)
But then again you might go for the slightly more complex MST CFX-w portals as they would not need to reverse your motor, and therefore are actually better then the Traxxas ones that required a reverse rotation motor.
willyg1981
Quarry Creeper
The rear in my mind would be a fairly simple fix using the trx fixing locations and just add them to the new cad'd housing that incorporate the trx4 diff cup ,
Excuse my ignorance but why would the motor direction need to be reversed only for the trx4 ?
I'm going to check out the MST now [emoji106]
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Excuse my ignorance but why would the motor direction need to be reversed only for the trx4 ?
I'm going to check out the MST now [emoji106]
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The TRX uses a 2 gear portal, the top gear (input) spins the opposite direction from the bottom gear where the wheel mounts. So to go in a forward direction the axles are turning backwards.
The MST portals use a pair of transfer gears between the top gear and the bottom gear so the input spins in the same direction as the output.
The portal gears on the TRX look to be wider, however the MST has twice as many teeth engaged so strength should be about the same.
Edit: If I were doing this mod, I would go for the MST ones unless parts availability was real bad.
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