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FF: Forks Headlamp Brackets

craig

Well Known and Active Website User
VOC Member
What are the proper dimensions of lower headlight brackets F86/2?
Mine appear too short for some reason, positioning the headlight an inch or so too low.

MO63.jpg
 

Mateusz Musialski

Website User
VOC Member
What are the proper dimensions of lower headlight brackets F86/2?
Mine appear too short for some reason, positioning the headlight an inch or so too low.

I don't know how you measured the length of F86/2.
But I observed that mine were bent a little more towards each side to accommodate the 179CV headlamp.
This bend resulted in lowering the position of the headlight.
When I returned to the correct 74CV headlamp I straightened the F86/2 back, so the position of the headlight was raised.

--
Regards,
Mateusz
 
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vin998

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VOC Member
VOC Forum Moderator
Craig
Your post no.12 above shows the Girdraulic forks MO63 diagram. Does your bike have Girdraulics fitted or Bramptons as per the photo in post 14 above?
Reason for asking is F86/2 is shorter and for the smaller 6.5" headlight shell where as F86 is longer and for the 8" headlight shell. I cannot remember the difference in length but I think its something like 1/2".
 

craig

Well Known and Active Website User
VOC Member
here is my Brampton set with 8" similar to period photo.
The 74CV HL of this same early period, on Girdraulics, seem to mounted even higher with a more pronounced angle.


8HLBracketAngle2.jpg



8HLBracketAngle3.jpg
 
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Gary Gittleson

Well Known and Active Website User
VOC Member
As you all surely know, the open D also has an 8" headlight. I believe the stays are also longer than those for the 7 inch job, probably in the flat sections. When I installed new ones on mine, I encountered a problem. The headlight shell fouled the round portions of these lower stays, forcing the light to point to the heavens. Maybe that's as it should be but I didn't like it. By adding some spacers (distance pieces) to a longer lower bolt, I was able to bring things down to earth.

These are simple parts but the geometry gets a little tricky.
 

BigEd

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VOC Member
VOC Forum Moderator
Why not make some longer/shorter stays to put the headlight where you want it to be? A fairly simple job. If you want them to be longer you just need a new piece of tube. Should you find that you want them to be shorter you may even be able to modify the existing stays.
 

craig

Well Known and Active Website User
VOC Member
I am not wanting to fabricate headlamp brackets to please my observations, I would like to get the actual dimensions and design of these prominent brackets.
Were there 3 versions? F86? F86/1? F86/2? And if so, what are design and dimensions?

Selfishly I would like dimensions of 1947 B series F86.
Centered crimp?, radius to crimp? length of each end? and overall length?????

TubingCrimpDim2.jpg
 

vin998

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VOC Member
VOC Forum Moderator
Here is the extract from one of my my spares list book. Its a Vincent book and not Harpers but I cannot find a date on it. I suspect the original F86 was the pre war seies A item which was flat blade rather than made from tube. Sorry I don't have the actual dimensions to hand.

pg4 - Copy.jpg
 

Marcus Bowden

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VOC Member
THE OTHER JIG FOR TUBE BENDING OF 1/2" TUBING THICK OR THIN WALLED
CLAMP INTO VICE INSERT TUBE BETWEEN ROLLERS AND PULL HANDLE ROUND TO FORM A BENT THIS IS FOR THE REAR LIFTING HANDLE.
KEEP WHEELS P[OLISHED SO ONE DOES NOT MARK NICELY POLISHED STAINLESS


IMG_2970.jpeg


THIS ONE IS FOR MUDGUARD STAYS

IMG_2969.jpeg
AS IT'S A CLUB THEY HAR HERE TO BE BORROWED SO LONG AS POST IS PAID FOR AND RETURNED WHEN FINISHED WITH,,, ORDER A FEW 6m LENGTHS BEFOREHAND AND IN A DAY ONE COULD MAKE SEVERAL SETS OF STAYS AND FLATTEN THE ENDS WITH THE OTHER JIG SHOWN ABOVE BUT A HYDRAULIC PRESS WOULD BE EASIER UNLESS YOU HAVE A SCAFFOLDING POLE ON THE VICE BAR.
bananaman.
 

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Cyborg

Well Known and Active Website User
VOC Member
Jigs that I've made, making mudguard stays rear lifting handles and were also used when making the frame for panniers, also headlamp brackets
THIS PAIR OF CLAMPS WILL PUT A RADIUS ON ONE SIDE OR BOTH SIDES DEPENDING WHICH END ONE FEEDS IT INTO
View attachment 38599


View attachment 38600

Now if I made a device to accomplish that task, it would probably look “slightly” more complicated. Am I correct in assuming that those 3 small holes and pin are used to anchor the stay and give you a choice of 3 different lengths?
 

Marcus Bowden

Well Known and Active Website User
VOC Member
No Cyborg my handsome,
those three holes are actually four in all to keep the top block aligned by those dowels. The lengths of the stays you have to work out your self, whether headlamp brackets or mudguard stays, holding the tube central in the jig and closing it under pressure holding it at either end will give you a single or double radius at the ends of your tubes ready for drilling.
bananaman.
 

Cyborg

Well Known and Active Website User
VOC Member
Thanks for the reply. It wasn’t the 4 alignment dowels I was inquiring about. It looks like there are 3 smaller holes (one with a pin hiding in the shadows? or perhaps it’s just a shadow) in the centre of the larger block. I thought perhaps they were there to determine the length of the crimp not the length of the stay.
 

craig

Well Known and Active Website User
VOC Member
In Craig's 2 pictures with the Bramptons, the upper stay is parallel with the lower fork link - is the problem a variation in suspension geometry?
Mike
Obviously the Vincent B series lower 8"headlamp brackets are way more important than where your nuts are.
Yes there could be geometry issues between Bramptons and Girdraulics as to where the lower mount point is for the headlamp brackets. The current brackets are of high quality, double crushed tubing instead of single for strength.

It appears, to me, that a change in dimensions in the supplied part F86/1 has occurred while we were sleeping. The period (1945-47) pics all show the large headlamp mounted an inch or two higher, while all restored/maintained series B have the lower mount brackets. I am recommending a "special task force" be appointed to look into this bracketry before it gets too wide spread and becomes the "new norm".

 

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