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Author Topic: Lessons Learned - Safety  (Read 8286 times)

StefanN

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Re: Lessons Learned - Safety
« Reply #15 on: 04 September 2019, 12:13:17 pm »
Nord Lock sell the ability to undo and reuse their washers as a major design feature.   Are you able to give any specifics of when/where you have used them and the specific difficulties?   It'll make it easier to understand the context of your experience and how it applies to any uses someone else might have.
Thanks

Anyone got any experience of Nord-lock washers?

Yes, but almost impossible in a situation where you want to reuse. Then again nylocks are only supposed to be ideal for a one time use!

RhysN

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Re: Lessons Learned - Safety
« Reply #16 on: 04 September 2019, 03:21:47 pm »
Nord Lock sell the ability to undo and reuse their washers as a major design feature.   Are you able to give any specifics of when/where you have used them and the specific difficulties?   It'll make it easier to understand the context of your experience and how it applies to any uses someone else might have.
Thanks

Anyone got any experience of Nord-lock washers?
We used them for the fastenings on Tensile fabric canopies  (think of the fancy "tent" where you wait to go over Nelson's Victory which I erected) where potential "flogging" of the fabric easily vibrated nuts off. As the structures often needed to be moved to different venues they had to be undone, and that created our difficulty. It was some years back (8 or 10) perhaps they have changed a bit in the time.

Yes, but almost impossible in a situation where you want to reuse. Then again nylocks are only supposed to be ideal for a one time use!

Steve Cole

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Re: Lessons Learned - Safety
« Reply #17 on: 04 September 2019, 04:36:58 pm »
I did not know anything about nord lock washers. Not sure how much better they are than a standard spring washer.
I think a combination of these, spring washers and Locknut/ nail varnish is probably the way to go.
I wasn’t aware that nylocks are only intended for single use 😳

RhysN

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Re: Lessons Learned - Safety
« Reply #18 on: 04 September 2019, 06:31:24 pm »
There is no question in my mind that Nord Lock are better than a standard spring washer. If you look at the website it states that they must be used under the head of the bolt as well as under the nut! I just found them difficult to re-use. Industry suggests that a star type spring washer is better than the single cut versions too.
Nylocs are intended for limited re-use more than single, except in critical places where they are single use (you won't find them on an aircraft if that's any hint).
I wonder if the variety of bolt choice we tend to use isn't helping, if you think automotive they are generally fine thread, rather than the standard engineering variety.
There is certainly something a bit strange as many vehicles have much rougher treatment than a number of laps on a tarmac circuit, and they don't have bolts coming loose so frequently.

ChrisS

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Re: Lessons Learned - Safety
« Reply #19 on: 04 September 2019, 07:59:34 pm »
Do the log books have a standard format?
Further to Bill's comments about checking previous shortcomings. Putting on my motorsport hat, every car there has a logbook in which things are noted. If something is a bit "not quite as it should be" like an advisory on an MOT then the car can run, this time, but needs to be rectified for the next. More major things must be fixed and rechecked before running.
Now I know this may sound a bit OTT, but when (not if) we get to 20+ CKs running perhaps a logbook should be already in place. Nice record for the car too in the future.

RhysN

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Re: Lessons Learned - Safety
« Reply #20 on: 04 September 2019, 08:47:33 pm »
Do the log books have a standard format?
Further to Bill's comments about checking previous shortcomings. Putting on my motorsport hat, every car there has a logbook in which things are noted. If something is a bit "not quite as it should be" like an advisory on an MOT then the car can run, this time, but needs to be rectified for the next. More major things must be fixed and rechecked before running.
Now I know this may sound a bit OTT, but when (not if) we get to 20+ CKs running perhaps a logbook should be already in place. Nice record for the car too in the future.
Pretty much the same in the countries I know about and would be easy to formulate if there is a collective will.

StefanN

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I've improved the end fixing of the steering column by:
extending the column so there's lots more thread beyond the Nyloc nut
Putting a cotter pin through the threaded end.

I did drill and tap the end of the column, but thought a bolt there was just as likely to shake loose so wouldn't add any real safety.

ChrisS

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Re: Lessons Learned - Safety
« Reply #22 on: 05 September 2019, 05:16:41 pm »
THese are the issues I've had on my various outings at Stretton:

Drive sprocket bolt came loose.
Axle keys loose and sliding
One rear hub bolt came loose

All the above were spotted and corrected during paddock checks, however, the following were not spotted!

Steering wheel temporary retaining pin vibrated out resulting in loss of steering
Steering column rode up as grub screws came loose, resulting in loss of steering (again) I was fortunate in both instances to be able to come to a controlled stop.

Chris Brown

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Re: Lessons Learned - Safety
« Reply #23 on: 09 September 2019, 05:50:21 pm »
The only problem with the Morgan was the camber "increasing" on the nearside which Rhys rightly red flagged me for. On examination it proved to be a combination of not being able to pull the wheels up tight (I thought because the washers were binding on the outer races), and me going quicker. Having just unloaded it I found the washers were actually bearing against the hub, not the bearing outer race, so the play was increasing as the hub wore, solution make spacers to replace the washers, a length of 3mm wall tube is on it's way.

The log book seems like a good idea, my thoughts are just a sheet on excel to fit an A5 binder, with columns: date; problem (fault possibly); action taken. I'll knock one up for my use shortly, and share it here.

As for the grub screws not holding on the axle, one solution is to position the bearing, lock up one screw, and spot drill the axle about 3mm deep, replace the grub screw with a dog point one, then repeat for the other one.
« Last Edit: 09 September 2019, 05:54:42 pm by Chris Brown »

GeoffM

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Re: Lessons Learned - Safety
« Reply #24 on: 13 September 2019, 09:57:31 am »
Re: to those with loose nuts, check out this website www.boltscience.com  lots of useful info. and to Stefan, I used mechanical disc brake calipers cheap on ebay (up to DVLA standard). cheers, Geoff

GeoffM

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Re: Lessons Learned - Safety
« Reply #25 on: 13 September 2019, 09:59:55 am »
Re disc brake calipers, I should have added, push bike ones, cheers, Geoff

StefanN

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Re: Lessons Learned - Safety
« Reply #26 on: 13 September 2019, 10:43:51 am »
Re: to those with loose nuts, check out this website www.boltscience.com  lots of useful info

Great link Geoff.   I've only read a couple of sections and I've already learned helpful stuff.

TheGiantTribble

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Re: Lessons Learned - Safety
« Reply #27 on: 20 October 2019, 09:05:04 am »
On the subject of safety, I was buying Xanny a cash helmet yesterday and the gentleman taking my money raised a good point.
They don't recommend mounting GoPro's on the sides or tops of crash helmets, in an accident they can puncture the helmet making things
very much worse. Their recommendation is if you have to mount a go pro on your helmet do it on the jaw line at the front as that is the strongest bit.

RhysN

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Re: Lessons Learned - Safety
« Reply #28 on: 20 October 2019, 09:33:59 am »
Mounting Go Pros on helmets is forbidden in all authorised motorsport.

Marek.Z.N

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Re: Lessons Learned - Safety
« Reply #29 on: 20 October 2019, 05:58:01 pm »
I agree bill, we mounted ours there. we also mounted in a relatively weak way so it is more likely to break off than catch on anything, further reducing risk of injury. It must be taken with a pinch of salt though therefor I only helmet cam a minimal amount.