I guess you all are familar with this picture as found on the "winternet" ;
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Unfortunatuly some dimensions are impossible to read. Could anyone please add or discripe the correct lenghts and thicknesses of this M20 girder forks? any other information about fork-dimensions are most welcome as in this link http://www.wdbsa.nl/Front%20fork.htm there are many facts noted by Ian ( thank you very much ) but unfortunately not all I think I need

this would be of great help.


thank you
Arnold

email (option): arnoldovertoom@gmail.com

Arnold those are my jottings. I've just had another go at it to include the overall length, based on my own "short" forks measuring 8 1/4" at the spindle distance (It looks like they have written it as 8 8/32" which makes the overall length 25 12/32". My own forks are the early 1/2" shorter than those in the drawing. It seems a strange way to display the measurements in multiples of 32nd inch? I can of course check it against mine tomorrow and add the 1/2". I can also convert all of the measurements to metric if you want. Ron

email (option): ronpier@talk21.com

Hi Ron, yes this will help. do you also know what the numbers at the midsection mean...I see something like 2.781 CRS at the left of the drawing and some unreadable numbers near the midsection..

email (option): arnoldovertoom@gmail.com

OK Arnold. Forget that previous drawing. I've checked against my forks and I'm pretty sure these are the correct dimensions. I altered the centre measurement it's 5 11/16" and not 5 11/32" as I first thought. (CRS = between centres) If you have the short forks subtract 1/2" (12.7mm) from the 17 1/8". Ron

email (option): ronpier@talk21.com

Hi Ron and all

This is great, now I understand a bit more and will check my girders and make a new plan for the to get them as-straight-as-possible again

Thank you, Ill let you know when next step can be makde inn this process

Cheers
Arnold

email (option): arnoldovertoom@gmail.com

Thanks for sharing Ron

Job

email (option): Jonnyob1atgooglemail.com

Lex has straightened up the drawing and typed in the dimensions for me. So much nicer for anyone who wants to save it. Ron

email (option): ronpier@talk21.com

Got a pain in my neck looking at that Ron!:joy:

Cheers,

Lex

email (option): welbike@outlook.com

Hi all
Has anyone ever made a straightening jig for an m20 fork blade
I have a good metal but bent fork blade I picked up in France this last trip
I’d like to see If anyone here has made one up & the results they obtained
Also - if they have done a set whether it was done hot & pulled cold
Br
Job

email (option): Jonnyob1atgooglemail.com

hi John

if you find one please let me know because earlier attemps to build one did not lead to the desired acuracy...
Arnold

email (option): arnoldovertoom@gmail.com

I've straightened a couple of forks that were bent sideways, by drawing a line on a table and lining up the top grease nipple and the central mudguard support on the line. Measure from the line to the bottom of the fork each side and adjust by clamping the bottom of each leg in a vice and bend cold until the correct dimension is reached. It's a totally different story if the forks are bent back or forth or mangled!!:confused: Ron

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email (option): ronpier@talk21.com

I'm going to make a Jig at some point as I have a set of new bent forks.
I also have some of the sheet brackets in stock.
As for the stampings I need to find a cheaper foundry as the last batch of castings they made came with a shock!

Mark

email (option): pes.sales@pesltd.uk

I have made a sturdy jig made of L angle steel 10 x 10 x 1 cm to straighten my fork. Works very well.

For those living in the Netherlands and interested I am happy to lend it. As it is heavy you need to come by car.

I live in the centre of the country. @Arnold; pm sent by email.

Hi Patrick

After summer I would like to have a close look at your rig… for now could you please upload fotos?

email (option): Arnoldovertoom@gmail.com

I made a jig, which worked very well, to straigten my bent girder. I try to upload a picture..%%htmlItem_1%%

Ali