Banjo Wheel Perforations

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Boomlander
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Banjo Wheel Perforations

Postby Boomlander » Fri Jan 14, 2022 9:50 pm

Hi All,
Just took delivery of Willum's banjo wheel which is to be cleaned and repainted and I have noticed these three oblong holes in the underside of the rim.
They are all the same size and shape and in the same position in each rim section.
I can only assume that they are designed to be relief points to minimise the risk of the rim splitting.
Anyone else seen holes in the wheel like this.?
Attachments
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IMG_20220114_213537.jpg (2.69 MiB) Viewed 276 times
IMG_20220114_213514.jpg
IMG_20220114_213514.jpg (2.69 MiB) Viewed 276 times


Sleeper
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Re: Banjo Wheel Perforations

Postby Sleeper » Fri Jan 14, 2022 10:12 pm

Just been into the shed to check , have a couple hung up , and it seems you have the choice , slots or holes...

John ;-)

Boomlander
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Re: Banjo Wheel Perforations

Postby Boomlander » Fri Jan 14, 2022 10:29 pm

That's amazing,
Many thanks for the reply.
I recall that my Series 2 wheel didn't have any holes like this so I guess they were introduced on the later design wheels.
👍😁


ManyMinors
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Re: Banjo Wheel Perforations

Postby ManyMinors » Fri Jan 14, 2022 11:09 pm

Mine has always had those - although yours shows some additional cracking too which is common as they get older. Perhaps those holes are to do with the moulding process?

Sleeper
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Re: Banjo Wheel Perforations

Postby Sleeper » Sat Jan 15, 2022 8:48 am

Piccies...
wheel1.JPG
wheel1.JPG (98.94 KiB) Viewed 241 times
wheel2.JPG
wheel2.JPG (183.12 KiB) Viewed 241 times
Manufacturing process?

John ;-)

jaekl
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Re: Banjo Wheel Perforations

Postby jaekl » Sat Jan 15, 2022 12:39 pm

Very common in the insert or over-molding operation to have supports for the metal inside so it's in the center.

Boomlander
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Re: Banjo Wheel Perforations

Postby Boomlander » Sat Jan 15, 2022 9:54 pm

Interesting information..... and what exactly is the material on these wheel rims?
I have restored several Series 2 catalin rims with Milliput epoxy putty but the material on the wheel I have just bought seems more like a plastic resin.


jagnut66
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Re: Banjo Wheel Perforations

Postby jagnut66 » Mon Jan 17, 2022 11:19 am

Hi,
I believe it's Bakelite but I stand to be corrected.
Best wishes,
Mike.
1954 Series 2: 4 door: "Sally" -- Back on the ground with (slave) wheels and waiting to be resprayed......
1955 Series 2: Traveller: "Elsie May" -- On the road and enjoying her 'as is' for now but I see work ahead......
1970 Triumph Herald 1200: "Hetty" -- Driven back from Llangollen in Wales (twice.....)

geoberni
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Re: Banjo Wheel Perforations

Postby geoberni » Mon Jan 17, 2022 11:57 am

jagnut66 wrote:
Mon Jan 17, 2022 11:19 am
Hi,
I believe it's Bakelite but I stand to be corrected.
Best wishes,
Mike.
It very probably is Bakelite, although my wheel has been very carefully cord wrapped in the past, so I've never looked at it in detail.
I believe the Bakelite manufacturing process means that you will never see a line around a Bakelite product left from any moulding, but I've no idea why. It's still used today, but in limited specialist areas like aerospace. There are small sheets of it for sale on FleaBay.
It's a phenol-formaldehyde resin rather than a 'plastic' as such, so making it is quite a toxic process and it can't be recycled.
Basil the 1955 series II

Image

Boomlander
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Re: Banjo Wheel Perforations

Postby Boomlander » Wed Jan 19, 2022 11:43 am

Two minutes work with the hot glue gun and the holes are gone!
😁👍


Sleeper
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Re: Banjo Wheel Perforations

Postby Sleeper » Wed Jan 19, 2022 12:36 pm

That's your Concours entry binned...

John ;-)

jagnut66
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Re: Banjo Wheel Perforations

Postby jagnut66 » Wed Jan 19, 2022 5:00 pm

Yes, the holes are worth 5 points each! :lol:
Best wishes,
Mike.
1954 Series 2: 4 door: "Sally" -- Back on the ground with (slave) wheels and waiting to be resprayed......
1955 Series 2: Traveller: "Elsie May" -- On the road and enjoying her 'as is' for now but I see work ahead......
1970 Triumph Herald 1200: "Hetty" -- Driven back from Llangollen in Wales (twice.....)


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