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mikegray660 said:
One or two...
ISO-cradle-frame alignment
- Thread starter Cheesy
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One or two...
L.A.B. said:Cheesy said:
The cradle would normally sit 3/16" to the left (of the frame centre line)?
Cheesy said:
[Edit:]I thought the rear Iso. fixed and adjustable abutment caps were more or less identical in width?
With the standard Mk3 front Iso it wouldn't be possible to fit the adjuster on the left side for the same reason.
Thanks, that is starting to make sense, I was pretty sure that the rear fixed part was the same as the front one but I will have to double check that now.
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ISOLASTICS ( thats a big word ) are fundamental to the configuration of a Norton Commando .
Its said . A /. The frames faitly light / soft .
B / . The Clearnces are fundamental to the opperation .
C / . The ALIGNMENT ( of the isolastics ) are fundamental to its opperation .
THIS is the alignment of the Cradle / Iso tiubes / bush to frame pins . Irrelevant ( though not discountable ) of Wheel
alignment ( Swing arm , steering head , Wheel Axles etc )
FOR the isolastic system to function as intended ( 2.000 Hp Bristol Centaurus Radials were mounted similarly )
A check with stringlines , pins , & rulers is feasable ( if you can read them )
Ensureing the front mount fitted and shimmed is central , equal clearnce ea side. In relation to the rear mount .
Missalignment of anything much results effectively in skewing .
Any significant amount of skewing leads to binding and / or ' false clearances ' . Ineffective operation / function .
++++++++++++++++++++++++++++++++++++++
If youre frame bolt mounts are PARRALLEL , checked by throwing a few one metre odd long rods though on the bare frame,
and seeing the ends are EXACTY the same distance spaced , puts it true in plan ,
Sighting the rods , fore and aft , will tell you if its in Lateral alignment .
The horizontal alignment is easier , as its varieable . If Required . The End caps / cups & spacers provideing a allowance here.
++++++++++++++++++++++++++++++++++++++
Back to ' A ' . , if the frames been snotted into something solid moderately firmly , Missaligned significantly . It probably best scrapped .The old raised welt across the top tube forwad , the down tubes adjacent , or wriggles , are indicative it mayve been run over by a Bus , A Semi ( THAT was close
) or suffered similar abuse . 
81 in Aus. theres a mint ' short wheelbase ' 850 sitting by a motor garges workshop / forecourt .Obviously we wander over .
The story was " Nah , theyre fairly soft . They all do that if they hit anything . We do quite a few of them .Got it from the insurance company .We'll Jut throw it on the chassis aligning machine and pull it out untill its right . You cant muck around stripping it or anything . You wouldnt make any money . You dont even need to take the tank off " . OH Dear . FUDGE .
NOT that theyve all suffered this scenario.BUT if the front pin mount lugs arnt where theyre supposed to be , theyre the easiest to put right .Assumeing no kinking , cracks or crushing . THE OBJECTIVE is the stated pin alignment and EQUAL
clearance sitting slack / unstressed . :mrgreen:
Murrys 750 was driven into a Mercedes at 45 mph by a nerd . After three profesional straigtenings ( the memory and natural sit , stress free had it walk back twisted and bound / grinded / shook / tremmered / vibration ) had him throw it
at me to chop up , as it was the best thing that could be done with it . Built the Domiracer frame from some of it .
Top Tube sat on the scrap pile . Noticeable Bow laterally if you took the trouble to check . You could have straightened it .
As I said , it'd been done three times . The strees relieveing in use allowed it to relax back missaligned no matter what .
Chopped up it didnt affect anything. In pasing , the cradle tubes , cut free , had somewhat dissimilar ' disposition '.
An inch or two out , SPRUNG cut free . . yes . well . Over to You , old Beans . :wink:
Its said . A /. The frames faitly light / soft .
B / . The Clearnces are fundamental to the opperation .
C / . The ALIGNMENT ( of the isolastics ) are fundamental to its opperation .
THIS is the alignment of the Cradle / Iso tiubes / bush to frame pins . Irrelevant ( though not discountable ) of Wheel
alignment ( Swing arm , steering head , Wheel Axles etc )
FOR the isolastic system to function as intended ( 2.000 Hp Bristol Centaurus Radials were mounted similarly )
A check with stringlines , pins , & rulers is feasable ( if you can read them )
Ensureing the front mount fitted and shimmed is central , equal clearnce ea side. In relation to the rear mount .
Missalignment of anything much results effectively in skewing .
Any significant amount of skewing leads to binding and / or ' false clearances ' . Ineffective operation / function .
++++++++++++++++++++++++++++++++++++++
If youre frame bolt mounts are PARRALLEL , checked by throwing a few one metre odd long rods though on the bare frame,
and seeing the ends are EXACTY the same distance spaced , puts it true in plan ,
Sighting the rods , fore and aft , will tell you if its in Lateral alignment .
The horizontal alignment is easier , as its varieable . If Required . The End caps / cups & spacers provideing a allowance here.
++++++++++++++++++++++++++++++++++++++
Back to ' A ' . , if the frames been snotted into something solid moderately firmly , Missaligned significantly . It probably best scrapped .The old raised welt across the top tube forwad , the down tubes adjacent , or wriggles , are indicative it mayve been run over by a Bus , A Semi ( THAT was close
) or suffered similar abuse . 81 in Aus. theres a mint ' short wheelbase ' 850 sitting by a motor garges workshop / forecourt .Obviously we wander over .
The story was " Nah , theyre fairly soft . They all do that if they hit anything . We do quite a few of them .Got it from the insurance company .We'll Jut throw it on the chassis aligning machine and pull it out untill its right . You cant muck around stripping it or anything . You wouldnt make any money . You dont even need to take the tank off " . OH Dear . FUDGE .
NOT that theyve all suffered this scenario.BUT if the front pin mount lugs arnt where theyre supposed to be , theyre the easiest to put right .Assumeing no kinking , cracks or crushing . THE OBJECTIVE is the stated pin alignment and EQUAL
clearance sitting slack / unstressed . :mrgreen:
Murrys 750 was driven into a Mercedes at 45 mph by a nerd . After three profesional straigtenings ( the memory and natural sit , stress free had it walk back twisted and bound / grinded / shook / tremmered / vibration ) had him throw it
at me to chop up , as it was the best thing that could be done with it . Built the Domiracer frame from some of it .
Top Tube sat on the scrap pile . Noticeable Bow laterally if you took the trouble to check . You could have straightened it .
As I said , it'd been done three times . The strees relieveing in use allowed it to relax back missaligned no matter what .
Chopped up it didnt affect anything. In pasing , the cradle tubes , cut free , had somewhat dissimilar ' disposition '.
An inch or two out , SPRUNG cut free . . yes . well . Over to You , old Beans . :wink:
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- 21,090
Cheesy said:
If the front vernier Iso. is the Mk3 type with the wider adjuster then I think the adjuster must be fitted on the right side, as the wide end of the Iso mounting tube has to be machined down to accommodate it.
http://www.oldbritts.com/13_067116.html
http://www.norvilmotorcycle.co.uk/techtalk03.htm
If the later type Vernier kit is fitted then I think both adjuster and fixed abutment are of approximately equal width so they could be fitted either way around as the Iso tube does not require machining but whichever vernier set is fitted (old or new) it should result in the cradle being offset to the left by approximately 3/16"
http://www.norvilmotorcycle.co.uk/techtalk04.htm
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