The Spares Company
Club Shop/Regalia
Parent Website
Contact Officials
Machine Registrar
Club Secretary
Membership Secretaries
MPH Editor and Forum Administrator.
Section Newsletters
Technical Databases
Photos
Home
What's new
Latest activity
Forums
New posts
What's new
New posts
Latest activity
Information
Bike Modifications
Machine Data Services
Manufacturers Manuals
Spare Parts Listings
Technical Diagrams
Whitakerpedia (Vincent Wiki)
The Club
MPH Material Archive
Flogger's Corner
Obituaries
VOC Sections
Local Sections
Local Section Newsletters
Miscellaneous
Club Assets
Club History
Club Rules
Machine Data Services
Meeting Documents
Miscellaneous
Essential Reading
Magazine/Newspaper Articles/Letters
Adverts and Sales Brochures
The Mighty Garage Videos
Bikes For Sale (Spares Company)
Log in
Register
What's new
New posts
Menu
Log in
Register
Install the app
Install
Home
Forums
Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Part # 327
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Magnetoman" data-source="post: 158927" data-attributes="member: 2806"><p>To add (or subtract…) to this topic, the first photograph shows the shape of the seat stay brackets on my 1950 C Black Shadow.</p><p></p><p>[ATTACH=full]51093[/ATTACH]</p><p></p><p>The larger hole has a 5/16" nominal diameter the smaller has a ¼". There is no sign of remnant threads inside the ¼" hole on any of the four "ears," but there wouldn't be if it was originally tapped 2BA.</p><p></p><p>The second photograph shows the outside-facing surfaces of the seat stays.</p><p></p><p>[ATTACH=full]51094[/ATTACH]</p><p></p><p>Those of you who are observant and have calibrated eyeballs will have noticed that both of the off-center holes on the right stay are ¼", while one of the holes on the left stay is smaller, sized for 2BA.</p><p></p><p>The third photograph shows the inside-facing surfaces.</p><p></p><p>[ATTACH=full]51095[/ATTACH]</p><p></p><p>In this case, two of the off-center holes are sized 2BA.</p><p></p><p>However, if your eyes are super-calibrated, you will have noticed that the center holes aren't exactly 5/16" (0.3125"), they're slightly smaller at 0.310". Since nominal 5/16" fasteners have shanks that are 0.305"–0.308" they are a nice slip fit, but what the size means is the holes couldn't have been drilled (or reamed) with standard 5/16" tooling. Typically, holes are made with standard-size tooling, and what goes in them is turned to the necessary size to fit, since turning is less expensive than custom tooling. This isn't the case on the Vincent.</p></blockquote><p></p>
[QUOTE="Magnetoman, post: 158927, member: 2806"] To add (or subtract…) to this topic, the first photograph shows the shape of the seat stay brackets on my 1950 C Black Shadow. [ATTACH type="full" alt="VincentSeatStay01.jpg"]51093[/ATTACH] The larger hole has a 5/16" nominal diameter the smaller has a ¼". There is no sign of remnant threads inside the ¼" hole on any of the four "ears," but there wouldn't be if it was originally tapped 2BA. The second photograph shows the outside-facing surfaces of the seat stays. [ATTACH type="full" alt="VincentSeatStay02.jpg"]51094[/ATTACH] Those of you who are observant and have calibrated eyeballs will have noticed that both of the off-center holes on the right stay are ¼", while one of the holes on the left stay is smaller, sized for 2BA. The third photograph shows the inside-facing surfaces. [ATTACH type="full" alt="VincentSeatStay03.jpg"]51095[/ATTACH] In this case, two of the off-center holes are sized 2BA. However, if your eyes are super-calibrated, you will have noticed that the center holes aren't exactly 5/16" (0.3125"), they're slightly smaller at 0.310". Since nominal 5/16" fasteners have shanks that are 0.305"–0.308" they are a nice slip fit, but what the size means is the holes couldn't have been drilled (or reamed) with standard 5/16" tooling. Typically, holes are made with standard-size tooling, and what goes in them is turned to the necessary size to fit, since turning is less expensive than custom tooling. This isn't the case on the Vincent. [/QUOTE]
Insert quotes…
Verification
What was Mr Irving's Christian Name?
Post reply
Home
Forums
Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Part # 327
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
Accept
Learn more…
Top