FTX Punisher C Hub Screw Mod

[Isle of Wight Basher]

Hi All,

following on from Cabbie's thread about the C Hub screw coming loose http://www.nutechracingforum.com/vb/showthread.php?t=562.

I've replaced the bushing with bearings, I did this as I couldn't get a nice free action if I tightened the standard screws fully. I'll also be doing Cabbies mod of adding a screw to stop it dissapering if it should come loose.

However I don't think that will happen with this mod as there are next to no rotational forces acting on the screw to loosen it.

Anyhow, the parts. (left to right 5x7x0.3mm shim, 5x8x2.5mm teflon seled bearing, 2 x 5x7x0.2mm shims, 5x8x2.5 flanged bearing, 5x7x0.3mm shim, M5 x 15mm dome head screw)

http://i61.photobucket.com/albums/h42/isleofwightbasher/FTX%20Punisher%20C%20Hub%20Screw%20Mod/CIMG0662.jpg

Parts laid out.

http://i61.photobucket.com/albums/h42/isleofwightbasher/FTX%20Punisher%20C%20Hub%20Screw%20Mod/CIMG0664.jpg

Fitted to screw ready to fit.

http://i61.photobucket.com/albums/h42/isleofwightbasher/FTX%20Punisher%20C%20Hub%20Screw%20Mod/CIMG0665.jpg

Fitted.

http://i61.photobucket.com/albums/h42/isleofwightbasher/FTX%20Punisher%20C%20Hub%20Screw%20Mod/CIMG0668.jpg

The steering action is now very smooth and light with no lateral free play at all.

[CAR-KILLER]

nice one i take it you have done top and bottom

LOL of corse its top and bottom now you see why im not a brain surgeon

[Isle of Wight Basher]

nice one i take it you have done top and bottom

Indeed ;-)

[mradlin]

Looks like a good mod. Let us know how it holds up for you.

[CAR-KILLER]

can you tell us who you ordered the bearings from.......please

[Isle of Wight Basher]

can you tell us who you ordered the bearings from.......please



http://www.rcbearings.co.uk/

[CAR-KILLER]

http://www.rcbearings.co.uk/




thanks for that

[Isle of Wight Basher]

thanks for that

No worries, excellent service they give too ;)

[cabbie]

Good mod there mate, well done sourcing the bearings too, I'll give this a go if the hubs come loose again.

If I ever find a spare screw and bush to replace the one that fell out that is :going insane:

[CAR-KILLER]

Good mod there mate, well done sourcing the bearings too, I'll give this a go if the hubs come loose again.

If I ever find a spare screw and bush to replace the one that fell out that is :going insane:




PM sent to you

[Isle of Wight Basher]

Good mod there mate, well done sourcing the bearings too, I'll give this a go if the hubs come loose again.

If I ever find a spare screw and bush to replace the one that fell out that is :going insane:

Cheers Matey, pm me your address and you can have my 3 remaining screws, and make yourself a bushing from 8mm steel tubing from b&q

I've been reading the spares in the uk thread, loved your last post !

[churre99]

hello I proved bearings there is and at the end they finished breaking, that that better result me this giving is these balljoint:
http://www.rc-car-online-shop.de/lshop,showdetail,24392,e,1265758597-24400,angebote.allgem_sonderangebote,va_0004,,Tsho wrub--angebote.allgem_sonderangebote,.htm
simply drill the holes of the c hub for 13mm, and place the screws of inside toward it was, it is very robust.regards

[Isle of Wight Basher]

hello I proved bearings there is and at the end they finished breaking, that that better result me this giving is these balljoint:
http://www.rc-car-online-shop.de/lshop,showdetail,24392,e,1265758597-24400,angebote.allgem_sonderangebote,va_0004,,Tsho wrub--angebote.allgem_sonderangebote,.htm
simply drill the holes of the c hub for 13mm, and place the screws of inside toward it was, it is very robust.regards

Yes, seen this, however your using alloy hubs, no forgiveness for normal bearings, plus you won't get an interference fit with your balljoints in the plastic hubs. I wouldn't have used the same bearings in alloy hubs.

I'll see how they go thanks.

I didn't want to drill the hubs, I've various balljoints/bearings I could have tried, but I wanted a direct cheap replacement for the standard bushings that solved the binding issues.

[churre99]

me this mod, the first time, I made it on the c-hub of plastic, putting the screws of inside toward it was, you avoid them to loosen the screws.regards

[mooman007uk]

the bearing mod works awesome in the alloy c-hubs as well, I've not run it yet but on the bench zero play and friction free...thanks for sharing the mod and for the rcbearing link;)

[Isle of Wight Basher]

Update,

As churre99 said some of the bearings have collapsed/cracked (on the right in the pic), however they only came apart on removal and the threads in the knuckles are still tight.

http://i61.photobucket.com/albums/h42/isleofwightbasher/FTX%20Punisher%20Rebuild/CIMG1067-1.jpg

So whilst an improvment over the original set up still not perfect.

I've got a set of the updated knuckles and screws coming so will decide what set up to run then.

[mooman007uk]

Oh great, looks like I'll be doing the spherical ball joint mod next then. Going to run mine this weekend after a track building session at gas jockey's place so see how everything holds up...

[Isle of Wight Basher]

I think these bearings will hold up ok for racing or general bashing, but I did a lot of jumping so am not that surprised at the damage.

The hubs still felt fine before removal, all the screws were still tight, and the knuckles undamaged.

If I wasn't getting updated knuckles then I'd just replace the bearings.

[mooman007uk]

that's good news...

[sonic2810]

just got my ftx so what would u suggest best mod so only do it once as have tested them now

[Isle of Wight Basher]

I got the revised screw set and knuckles, but the revised screw set system is still are not perfect for the plastic c-hubs.

So I've ended up modding the standard hubs to be similar to the revised ones, and using moddified T-Nuts, fully tightening the screws so that the bushing is tight against the hub and rotates in the plastic c-hub, pictures to follow.

[sonic2810]

cool will wait for them only really run other day for 10 mins will try get another run this week

[Isle of Wight Basher]

Cut down T Nut and Standard Bushing Drilled Out To 6mm (On Right)

http://i61.photobucket.com/albums/h42/isleofwightbasher/FTX%20Punisher%20Rebuild/CIMG1093.jpg

The T Nut is cut short so the bushing is tight against the knuckle

http://i61.photobucket.com/albums/h42/isleofwightbasher/FTX%20Punisher%20Rebuild/CIMG1095.jpg

Fitted, the bushing now rotates in the plastic C-Hub and has a nice smooth action with little slop, please note for alloy c-hubs I would use the revised knuckles and screws, I'm using this set up as I found the revised set up was not suitable for plastic hubs due to the flex in the hubs meaning the t nuts were loose in the knuckle and over time this would wear the knuckles holes.

http://i61.photobucket.com/albums/h42/isleofwightbasher/FTX%20Punisher%20Rebuild/CIMG1098.jpg

[mooman007uk]

I ran 5 tanks at the weekend with the cabbie bearing mod in alloy knuckles, it's working perfect...zero slop and nice and smooth...i think that mod also worked in the plastic hubs

[Isle of Wight Basher]

I ran 5 tanks at the weekend with the cabbie bearing mod in alloy knuckles, it's working perfect...zero slop and nice and smooth...i think that mod also worked in the plastic hubs

Was that my bearing mod ? If so yes it works fine in the plastic hubs but as per a few posts back on taking it apart a few of the bearings were broken.

As already said I had been jumping it so was not surprised at the damaged bearings.

I re-did it this way to allow use of the revised knuckles

[mooman007uk]

oops, knew it was someone in the UK...I haven't taken mine apart yet but they definitely took some heavy hits at gas jockey's track.
i like the t nut mod...where do you get such a thing?

[Isle of Wight Basher]

oops, knew it was someone in the UK...I haven't taken mine apart yet but they definitely took some heavy hits at gas jockey's track.
i like the t nut mod...where do you get such a thing?

Yeah, if I hadn't taken mine apart they would still be going good.

The T nuts I used came from the cable clamp of a 415V Electrical Socket from where I used to work, sadly as I don't work there I can't get them anymore. But google "T Nut" and ones used for cabinet making would work also the ones out of the revised screw kit (if shortened) would also work.