zxrlocost
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| posted on 27/9/05 at 09:35 AM |
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holding floor pan on
as far as I understand one of the first things I do is fit the floor pan to my MK when I get it, Ive been wondering instead of rivets is there any
issues with tex screws???(spelt right?)
used a couple the othe right they go straight through thick metal and are very strong no pre drilling etc etc saving so much time
any ideas anyone
chris
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indykid
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| posted on 27/9/05 at 09:59 AM |
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would it be this sort of thing you mean? (see pic)
if they've got a bigger head than a rivet, you might struggle to get the side panel on. if they are the ones below, they'll look nasty
(under the floor i know) and think of all the extra drag caused by the heads 
stick with rivets imo unless you're going for a 'quick' build.
tom
 
Rescued attachment screw.jpg
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zxrlocost
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| posted on 27/9/05 at 10:01 AM |
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hi mate youve got the right bottom half but the top is a very low dome shaped philips head so shouldnt cause any probs
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clbarclay
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| posted on 27/9/05 at 10:02 AM |
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Only disadvantages with them (i presume there the sort with drill on the end and slef taping bolt behind) I can think of off top of my head is they
stick out 1/4 inch (not too bad but nots as smooth as rivets) and theres the potential for them to come undone.
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zxrlocost
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| posted on 27/9/05 at 10:07 AM |
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thread lock,?
if you use the philips head type they stick out no more than a normal dome head screw
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Peteff
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| posted on 27/9/05 at 10:13 AM |
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theres the potential for them to come undone
Pop rivets aren't exactly infallible. If it's Sikaflexed first and left to go off then screwed on it should be pretty secure. There should
be enough flex in the sides to clear the heads if they're same as the domed ones I have.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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indykid
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| posted on 27/9/05 at 10:39 AM |
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there is plenty of room for them if they're like pan head self tappers, probably about 6-7mm gap between side panel return and floor, but was
just concerned that the hex head ones would foul.
hth
tom
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zxrlocost
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| posted on 27/9/05 at 11:02 AM |
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yes thats great info mate could be onto something new
chris
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Avoneer
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| posted on 27/9/05 at 11:07 AM |
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Not sure if there is enough metal in the chassis tubes for them to bite though - 1.6mm???
Pat...
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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indykid
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| posted on 27/9/05 at 11:14 AM |
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the thread pitch looks quite fine, much finer than a self tapper, so they might hold alright.
time for some destuctive testing methinks
tom
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zxrlocost
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| posted on 27/9/05 at 11:23 AM |
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and methinks azwelly
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Hellfire
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| posted on 27/9/05 at 11:49 AM |
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Apart from saving a bit of time drilling, I don't see the advantage of using these instead of ordinary rivets.
In fact you'd probably spend more time applying threadlock & screwing these in than you would pulling up a rivet, so the time saved would be
negligable.
And then theres the weight.......
All in, they must weigh a fair bit heavier than rivets. 
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Triton
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| posted on 27/9/05 at 11:58 AM |
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Rivets everytime along with sikaflex because this all adds to stiffness of the chassis without adding any real weight.
Cheers
Mark
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zxrlocost
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| posted on 27/9/05 at 12:07 PM |
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there pretty light though?
and drill straight in so no messing!
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Hellfire
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| posted on 27/9/05 at 12:32 PM |
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quote:
Originally posted by zxrlocost
there pretty light though?
and drill straight in so no messing!
For a thread to gain it's maximum force generally - the thread needs to be engaged for at least is nominal diameter. Is that screw 2mm diameter?
There is also the potential of overtightening due the thin section it is going into... if you strip the thread in the chassis not only will it weaken
it but the fixing will be useless... obviously, it's up to you. I just can't see the advantages...
Everytime I have used that type of fastening the screw wobbles about like a tw4t whilst drilling - but maybe you have been succesful in the past.
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zxrlocost
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| posted on 27/9/05 at 12:50 PM |
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ok fair enough
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andygtt
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| posted on 28/9/05 at 11:02 AM |
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I'd also say it is a bad idea.... yes you could thread lock them but my understanding is that the alloy pannel adds to the chassis ridgidity.
and securing with 1.6mm of thread just wont be enough IMO.
On my last kit I used 2000 rivits to secure the alloy pannels on along with the sicoflex. Over the years that I owned and abused it I never found one
loose rivit.
Andy
please redefine your limits.
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