34LikesSchumacher Mi5
06-17-2013, 09:48 AM
#676
Having some durability issues with my turnblocks. The large thread bolts that thread up underneath the caster block seems to be... "not quite great". I can't tell if there aren't enough threads, or if the bolt is a tick too short, the threads are too fine, or if the plastic isn't tough enough, but iv already gone through 3 of these things. (one per race day)
i pre-thread with the grub screw, and only tighten down the bolt till it just BARELY snugs on the lower bearing (as little as I possibly can). But still, after a number of packs, maybe 8 or 10... the bolt will back itself out just a tiny bit... and if I take the bolt out, sure as heck... there are always a couple of threads that come out with it... stripped. It might last one more run before I need to replace it.
Anybody else having this issue? I have almost zero contact with the boards, and these parts are breaking.
Having said that... my turnblock made it through all but the last 4 corners in the main today.. and I was able to finish out in 1st... 1 more lap and it would of been a DNF. Car was brutally good otherwise.
i pre-thread with the grub screw, and only tighten down the bolt till it just BARELY snugs on the lower bearing (as little as I possibly can). But still, after a number of packs, maybe 8 or 10... the bolt will back itself out just a tiny bit... and if I take the bolt out, sure as heck... there are always a couple of threads that come out with it... stripped. It might last one more run before I need to replace it.
Anybody else having this issue? I have almost zero contact with the boards, and these parts are breaking.
Having said that... my turnblock made it through all but the last 4 corners in the main today.. and I was able to finish out in 1st... 1 more lap and it would of been a DNF. Car was brutally good otherwise.
I've done this on some A-arms that had lost some threads, and still going strong..
HiH
Ed
06-17-2013, 11:29 AM
#677
I can't say enough good things about the design and build of this chassis - a very enjoyable kit to build and it looks freak'n awesome when you are done. I should have it on the track this Wednesday. Btw, I firmly tighted the kingpin bolts (without coming close to stripping anything) in the believe that some of the issues have been related to them loosening under racing conditions which then casues the damage to the threads. Note that the bearings can not bind no matter how much you tighten the kingpin bolt. We'll see how it goes.
06-17-2013, 02:40 PM
#678
I can't say enough good things about the design and build of this chassis - a very enjoyable kit to build and it looks freak'n awesome when you are done. I should have it on the track this Wednesday. Btw, I firmly tighted the kingpin bolts (without coming close to stripping anything) in the believe that some of the issues have been related to them loosening under racing conditions which then casues the damage to the threads. Note that the bearings can not bind no matter how much you tighten the kingpin bolt. We'll see how it goes.
06-17-2013, 05:08 PM
#680
Tech Addict
iTrader: (38)
I am not sure if this will help, but did you run the grub screw all the way in? I only put it in enough for the real screws to grab and mine haven't loosened after 600+ laps. It might be a slight mismatch between the grub screw threads and real screws causing the issue.
06-17-2013, 05:33 PM
#681
Tech Addict
iTrader: (25)
I receive my kit today and the ammendment sheet have a advice for this issue. "pre-tap the hub carrier with the M4 grub screw until the grub screw is flush with the moulding"
Hope this help.
Pd. I made a mistake and order 2 kits and only will take one.Any one interested in the other kit send PM I will make a great deal.
Hope this help.
Pd. I made a mistake and order 2 kits and only will take one.Any one interested in the other kit send PM I will make a great deal.
06-17-2013, 05:42 PM
#682
I haven't run the car yet, but I can't believe how much chassis flex it has.
And that's with the extra top deck spacer.
And that's with the extra top deck spacer.
06-17-2013, 11:38 PM
#683
I am not sure if this will help, but did you run the grub screw all the way in? I only put it in enough for the real screws to grab and mine haven't loosened after 600+ laps. It might be a slight mismatch between the grub screw threads and real screws causing the issue.
06-18-2013, 05:26 AM
#684
I also followed the amendment and did not run the set screw all the way through.
06-18-2013, 08:20 AM
#685
Tech Adept
I have heard ppl use longer bolts for a king pin as the standard only goes in 3 mm into the hub when there is 5 mm till the other side and still the king pin will just miss the driveshaft
The idea is that its more tread to pull out so it should be stronger in a crash
So get some longer screws and get one the doesn't hit the driveshaft ( even if u cut one to size)
The idea is that its more tread to pull out so it should be stronger in a crash
So get some longer screws and get one the doesn't hit the driveshaft ( even if u cut one to size)
06-18-2013, 12:46 PM
#688
06-18-2013, 12:59 PM
#689
helicoil will works as for repair .but the outside of the helicoil thread is course and plus you will be taking more material out of the hub for the helicoil to screw in ,make sure you glues the helicoil in ,so it will not come loose
Last edited by OVA; 06-18-2013 at 01:12 PM.