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  1. #1
    V&J T4's Avatar Now you're learning (Copper)
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    Unwin rail mounting

    I'm looking at using low profile Unwin rails in the back and I'll sort my ply flooring at the same time.
    As the van floor isn't flat, what's the best way of mounting the rails? Would it be best to have some steel plates that span the ridges in the floor to give a flat surface to lay the rails on?

    Thanks
    James

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    caravellvis's Avatar Maybe you actually know something (Bronze)
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    Lay 'em on the ply? Router some grooves in the ply?

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    V&J T4's Avatar Now you're learning (Copper)
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    Quote Originally Posted by caravellvis View Post
    Lay 'em on the ply? Router some grooves in the ply?
    Do you work for Unwin? That's what they have now told me to do lol.

    The very helpful technical chap from Unwin got back to me again and said they've never noticed the difference in the pictures between mounting low profile and surface mount on their instructions. He didn't understand why they would be different.

    Anyway, his suggestion for the low profile rail is to use 18mm plywood and route 12mm deep groves (maybe slightly less depending on flooring finish) for the rail to sit in.


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    Activ8 (6th February 2019)

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    Activ8's Avatar Moderator
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    Quote Originally Posted by V&J T4 View Post
    Do you work for Unwin? That's what they have now told me to do lol.

    The very helpful technical chap from Unwin got back to me again and said they've never noticed the difference in the pictures between mounting low profile and surface mount on their instructions. He didn't understand why they would be different.

    Anyway, his suggestion for the low profile rail is to use 18mm plywood and route 12mm deep groves (maybe slightly less depending on flooring finish) for the rail to sit in.


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    That's great customer service from Unwin , thanks for posting and letting us all know. Had a couple of strips in the garage for ages that might be useful - thought I might use it on one of those folding centre rail T5 tables.

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    V&J T4 (6th February 2019)

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    V&J T4's Avatar Now you're learning (Copper)
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    Quote Originally Posted by Activ8 View Post
    That's great customer service from Unwin , thanks for posting and letting us all know. Had a couple of strips in the garage for ages that might be useful - thought I might use it on one of those folding centre rail T5 tables.
    My plan is to use the rails for the seats and also to secure my bikes and other loads when the seats are removed.
    I hadn't thought about using it for a table, that's a great idea.

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    V&J T4's Avatar Now you're learning (Copper)
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    Not keen on having the rails on the ply... tightening the bolts to an acceptable torque would be difficult if you add a compressible material into the mix, so should the worst happen, the shear stress through the bolts could have them snapping.

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    Activ8's Avatar Moderator
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    What does Unwin recommend for fixing that particular rail? Must be a common question?

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    V&J T4's Avatar Now you're learning (Copper)
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    From their PDF, the low profile rail needs to be mounted directly to the vehicle floor, the ply flooring sits under the rail edges.
    Interestingly though, the surface mount rail can be laid on top of the ply, but I can't see how you can get an even and accurate torque (11nm iirc) with a material that can be compressed under load - I've had a seat break loose because aluminium box was used to raise the seat. In the impact (stock car racing), the aluminium box compressed so the torque on the bolts was reduced, the seat could then move a bit and the bolts sheared. Not fun!

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    Activ8's Avatar Moderator
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    Are there any "clues" in their floor kits? What's the minimum length of rail as it has a M10 (?) fixing every 10cm(?) - assume it's to the nearest 10cm or fixing. Is the rail for a R&R bed? Some of the R&R bed builders offer it as an option so could be worth a chat about their specs??

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    V&J T4's Avatar Now you're learning (Copper)
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    It's an M8 every 10.16cm, the minimum rail length would be around 11-12cm as each rail needs a minimum of two fixings.

    I finally got hold of Unwin who were really helpful once I got through to the right person - my first attempt at contacting them last week was less than successful lol.
    They have said it is safe to mount the rail on to ply and bolt through that to the vehicle floor/chassis, provided all the fixings are used at the correct spacing.

    I'm still not sure personally, but if the manufacturer says it's ok, then I'll go with that.


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    Activ8 (5th February 2019)

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