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| lambert.the.farmer Member Since: 11 Apr 2012 Location: harrogate Posts: 2006   
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Quick question, how close together can I reasonably put m16 bolt holes in a 12mm thick drop plate such as to get a degree of fine ball height adjustment without making a piece of Swiss cheese and loosing any meaningful strength? Rhubarb and custard let fly with their secret weapon.
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29th Apr 2014 5:49am |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11240  
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The typical spacing is 50mm centre to centre but I'd say you could reduce that to 40mm without any adverse effects. That would still leave the same amount of steel around the holes as the hole diameters. I don't think I'd go any closer without some sort of calculation to prove it. Darren
110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
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29th Apr 2014 6:58am |
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| william8 Member Since: 03 Apr 2013 Location: Motherwell Posts: 259  
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If your up for some dynamics:
http://www.ewp.rpi.edu/hartford/~ernesto/S...k-Ch06.pdf I may do it tonight if i have some time, although i have exams coming up  William |
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29th Apr 2014 9:25am |
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| lambert.the.farmer Member Since: 11 Apr 2012 Location: harrogate Posts: 2006
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I have two twin axle trailers with different height couplings so ideally I'd like to have two positions about 27 ish mm apart. I have an adjustable tow bar but it fouls the nato hook and it rattles lik a rattling thing. The screw type would be cool but I have yet to find one. Hence a fixed plate one with holes precisely where I need them is the way forward. Rhubarb and custard let fly with their secret weapon.
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29th Apr 2014 6:21pm |
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| Ragerover Member Since: 27 Dec 2013 Location: In a land far far away Posts: 145
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In the trade it's 1.5 x diameter of the hole
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1st May 2014 9:21pm |
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| JWL Member Since: 26 Oct 2011 Location: Hereford Posts: 3443 
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Have you not got the option of swopping wheels/tyres round on the trailers to equalize the hitch height?
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1st May 2014 10:03pm |
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| RFT Member Since: 13 Nov 2010 Location: Cheshire Posts: 674 
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Surly it would be better to fit a a packer to one of the trailers hitch to equalise the heights, unbolting and re bolting 2No M16 bolts every time is going to be a right pita and compromise the integrity of the tow ball attachment, unless you carry a significant sized torque wrench with you at all times.
or split the difference so one trailer is 14mm high and one 14mm low. 130 Puma HCPU with an Artica 240LR Demountable Camper |
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2nd May 2014 1:04am |
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| Supacat Member Since: 16 Oct 2012 Location: West Yorkshire Posts: 11018 
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Any more details on this? |
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3rd May 2014 1:16pm |
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| lambert.the.farmer Member Since: 11 Apr 2012 Location: harrogate Posts: 2006
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Unfortunately as with most of my life it is not as simple as that. The big trailer only gets used in summer but the smaller one is used all year but by 2 other cars one of which has a non adjustable hitch so it's the easiest option to adjust the defender twice a year. The screw hitch was made by a firm called peter lea but they are not trading, and the hitches are super rare. Rhubarb and custard let fly with their secret weapon.
Last edited by lambert.the.farmer on 3rd May 2014 6:41pm. Edited 1 time in total |
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3rd May 2014 1:58pm |
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| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3346 
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Cant find the manufacturer (from memory Witter?) But they pop up on ebay from time to time.
Found this rather ratty looking one but nicer ones are out there http://www.ebay.co.uk/itm/Screw-adjustable...7675.l2557 Really I would just get a 2 pin adjustable tow bar as they seem to rattle less than a single pin. I have seen a mod where you drill and tap a hole in line with the slider to put in a grub screw so once it is set at height you tighten the grub screw and it takes out any slack and secures it tight. I haven't needed it on mine but I managed to find a long slider which I used the top for a tow ball and bottom for a pin type though I suppose there is nothing stopping you from doing a pair of tow balls on one slider? |
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3rd May 2014 2:08pm |
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| Supacat Member Since: 16 Oct 2012 Location: West Yorkshire Posts: 11018
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Thanks
never seen one of those before so added to my memory bank (and wishlist!). |
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3rd May 2014 6:10pm |
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| lambert.the.farmer Member Since: 11 Apr 2012 Location: harrogate Posts: 2006
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Yay problem solved, brink do a 4 bolt tow ball which is the same fittings as my 5 tonne pin and ball but the ball is almost the exact height I need without drilling more and more holes in my drop plate. Woo hoo! Rhubarb and custard let fly with their secret weapon.
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5th May 2014 7:32am |
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