Author Topic: A10 Plunger Flash Frame Alignment  (Read 2565 times)

Offline Stu55Flash

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A10 Plunger Flash Frame Alignment
« on: 03.03. 2010 23:33 »
Hi

I have now stripped the old paint, cleaned the frame, removed the headstock cups and now need to check the headstock alignment with the plunger shafts at the rear. I have inserted a sturdy pipe through the headstock and assembled the plunger shafts. The idea was to use a spirit level on the head stock pipe and then see if the plunger shafts are vertical. Measurement is difficult as either the plunger shafts or the headstock can be vertical at one time. I will try with the frame on its side tomorrow night.

However the plunger shafts are not parallel - I assume they should be. The bottom is 3/16" wider than the top. Can someone tell what the correct distance should be to the shaft centre lines. I will use a jack on the lower frame and a car spring compressor to pull the top frame in.

Has anyone any tips on how to check the headstock alignment with the plunger shafts? Any advice gratefully received.   

Thanks Stu
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"Keep a distance from lady "L" drivers in cars. Some are not mechanically minded, are slow to acquire road sense, an are apt to panic..." The Pitman Book of the BSA Twins.
Golden Flash Plunger 1955, Francis Barnett Falcon 67 1954, Ferguson TEA Tractor 1951. Looking for another project!

Online Brian

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Re: A10 Plunger Flash Frame Alignment
« Reply #1 on: 04.03. 2010 05:09 »
This might help.
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Online muskrat

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Re: A10 Plunger Flash Frame Alignment
« Reply #2 on: 04.03. 2010 08:51 »
Good one Brian, would you have one for the S/A as well ?
Cheers
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'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
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Online Brian

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Re: A10 Plunger Flash Frame Alignment
« Reply #3 on: 04.03. 2010 09:07 »
I dont have one for the swingarm A frames but this one is a 54' GoldStar frame. I would think the basic geometry would be the same.
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Offline olev

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Re: A10 Plunger Flash Frame Alignment
« Reply #4 on: 04.03. 2010 12:14 »
Muskrat,
Have a look here.
http://bsa-a10.hailwood.com/bsaframes.html
cheers
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Online muskrat

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Re: A10 Plunger Flash Frame Alignment
« Reply #5 on: 04.03. 2010 18:41 »
Thanks fella's. I have a '51 plunger frame that needs attention.
Cheers
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'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
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Muskys Plunger A7

Offline Stu55Flash

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Re: A10 Plunger Flash Frame Alignment
« Reply #6 on: 06.03. 2010 01:00 »
OK now think have aligned frame. Used laser level to draw line from headstock down cross bar through middle of plunger shafts. Then used spring compressors and chocks to bend frame back to measurements on drawing.

Thanks for the help.

Stu
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"Keep a distance from lady "L" drivers in cars. Some are not mechanically minded, are slow to acquire road sense, an are apt to panic..." The Pitman Book of the BSA Twins.
Golden Flash Plunger 1955, Francis Barnett Falcon 67 1954, Ferguson TEA Tractor 1951. Looking for another project!

Offline duTch

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Re: A10 Plunger Flash Frame Alignment
« Reply #7 on: 20.10. 2011 09:04 »
Hey Stu,
            Hope yours worked out ok, Thanks Brian and Olev,for those plans and link,printed off a couple of copies. I think mine's a bit more complicated than yours,so dropped it off to Dave Kellet today with said copies,will find out in a couple of weeks
             duTch
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Offline v8ivor

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Re: A10 Plunger Flash Frame Alignment
« Reply #8 on: 15.02. 2016 20:47 »
I have the same problem Stu55. How did you hold the frame and what did you pull against ?
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