Author Topic: Lessons Learned - Safety  (Read 9028 times)

Adrian

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Re: Lessons Learned - Safety
« Reply #30 on: 17 Nov 19, 11:40 am »
I think all the above reports and comments are invaluable and again, support the case for a some form of 'Club' (sorry Rhys) Produced booklet, the latter part of which could be the logbook Rhys suggested.
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StefanN

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Re: Lessons Learned - Safety
« Reply #31 on: 08 Dec 19, 04:32 pm »
I’ve moved the discussion about wheels and spokes into it’s own topic to make it easier to find.
http://www.cyclekartsgb.com/tech-forum/wheels-and-spokes/

NewbieNick

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Re: Lessons Learned - Safety
« Reply #32 on: 04 Oct 23, 01:03 pm »
Hi Guys, stuff that went wrong at Westernzoyland. 1st Steering column moved about 10mm, despite grub screws being tight, fixed by split locking collars at both ends against  bearings. Second Tie rods bent next to rod ends. When my pitman arm is at full lock 3.0 clock & 9.0 clock the rod ends are straining against bolts, fixed by using ball joints instead.  On another Kart the fuel tank became detached.  I have added jam nuts to fuel tank fitting points & installed an onboard fire extinguisher. I think the latter is something you should all consider.

Regards Nick

VincoCycles

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Re: Lessons Learned - Safety
« Reply #33 on: 07 Jan 24, 07:15 pm »
I am new here and planning my first build. - I have noticed that loose fasteners seem to be a common problem......

nyloc nuts are of limited effectiveness (as a number of you have found)

what does surprise me is i have seen no mention of the use of retaining compounds (Loctite/ Bondloc etc) - these are available in a number of different grades from "retainers" to thread locks - witch have a stronger bond than the steel in the bolts.    for those not aware they are applied from a small bottle, a few drops per joint. once tightened up, the material cures to form a bond.  I use these materials in a number of industrial applications (including bonding motor rotors to their shafts) and have never known the bonds to fail.
The the fastening gets stuck tight, then around 120-130degrees of heat will cause the bond to release ...( their are high temperature versions that may be more suited to brake disks)

Loctite 638 or Bondloc B638  is what i would expect to be most appropriate for most fixings on a cyclekart

Is there a reason why these methods don't seem to be in use?

they are widely used in the motor industry, ands is why bits don't fall off your car!!

Im interested in the views of others

RhysN

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Re: Lessons Learned - Safety
« Reply #34 on: 12 Jan 24, 08:56 am »
Nylocs are fine, if used properly, only once. I think the early versions of this topic did mention threadlock compounds, maybe has disappeared over the years.
We must avoid torturing our brains with false problems, it occupies but it can annoy. In jest!

Tim Wheater

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Re: Lessons Learned - Safety
« Reply #35 on: 08 Mar 24, 12:00 am »
Nylock nuts hold the 5 bladed props on our gas turbo prop aircraft as well as many other things, used properly they are fine.

Ian Fletcher

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Re: Lessons Learned - Safety
« Reply #36 on: 08 Mar 24, 01:16 pm »
I must admit I frequently re-use nylocs.  As long as there is sufficient run-down torque when refitting, then I will re-use them.  Now anxiously waiting to see if I am deemed to be a heretic and liable to be stoned  ;)

thamesmud

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Re: Lessons Learned - Safety
« Reply #37 on: 09 Mar 24, 12:14 pm »
I must admit I frequently re-use nylocs.  As long as there is sufficient run-down torque when refitting, then I will re-use them.  Now anxiously waiting to see if I am deemed to be a heretic and liable to be stoned  ;)
I think I fall into the heretic amp and tend to re use them.  My dad and elder brother worked as mechanics on aircraft and I was taught that if you can't run it through the lock section with you fingers the nut is ok to re-use.  I see one commentator notes that nylocks are used on propeller installations, that fired me up to go and check.
The "finger tight" guidance is still in force for general locknuts but nylocks are not permitted in high temperature applications or when parts are subject to rotation:  according to the FAA AC: 23.607-1 1984 "CAR Section 3,294 and FAR Section 23,607 require that no selflocking nut may be used on any bolt subject to rotation in operation unless a nonfriction locking device is used in addition to the self-locking device," Nonfriction locking is lock wire or split pins or bend up lock washers.
In as far as this applies to cyclekarts I am going to use mechanical locking to backup nylock on critical items such as wheel spindles.