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by Bob.Murphy
Mon Jun 24, 2019 9:11 pm
Forum: Four stroke
Topic: Removing the ringds from a VB piston
Replies: 5
Views: 113

Re: Removing the ringds from a VB piston

Use heat to expand the piston more than the rings - nothing fancy to start with, just boil it in water with some washing-up liquid for a while and see what happens.
Avoid industrial cleaner -it can eat the alloy.
Bob.
by Bob.Murphy
Sun Jun 23, 2019 6:47 pm
Forum: Main Chat Forum
Topic: Grades of Steel
Replies: 2
Views: 104

Re: Grades of Steel

Thanks Nev, The nuts will have a plain shank where the wheel adjuster rubs and I'll make them a bit wider than normal. There should be plenty of thread in there. They will be lathe turned, not cut with a Tap. I saw some EN16 Hex, but it was too small. I'll keep looking. Acquiring steel stock is anot...
by Bob.Murphy
Sun Jun 23, 2019 11:35 am
Forum: Main Chat Forum
Topic: Grades of Steel
Replies: 2
Views: 104

Grades of Steel

A question for all you Metallurgists out there . . . I will be making wheel spindle nuts for an Ariel 'LF' (using a hub that may or may not be from a Triumph Cub). The hex bar I have, and other stuff I've seen, is "EN1A - Leaded". The technical descriptions say it is used for nuts, studs e...
by Bob.Murphy
Sat Jun 22, 2019 10:37 am
Forum: Four stroke
Topic: LF 250 - pictures please
Replies: 2
Views: 123

Re: LF 250 - pictures please

Thanks Bob, Does the O/S (right-hand) end of the wheel spindle have flats to prevent it from rotating ?? The drawing I'm working from has flats top and bottom leaving the spindle fitting a slot of 10.2mm. The other end does not have flats and therefore fits a slot of 12.7mm. Do these slot heights ma...
by Bob.Murphy
Fri Jun 21, 2019 12:40 pm
Forum: Four stroke
Topic: LF 250 - pictures please
Replies: 2
Views: 123

LF 250 - pictures please

As you have probably spotted, I will be making a rear wheel spindle that will fit a Triumph T20 (Tiger Cub) hub into a 1929 LF frame. This is not my bike, I am doing this remotely for a new Club Member. Could someone post up a picture or two of the rear frame / rear wheel mount of an LF please ?? Th...
by Bob.Murphy
Fri Jun 21, 2019 12:35 pm
Forum: Four stroke
Topic: Lathe user?
Replies: 19
Views: 745

Re: Lathe user?

According to my Thread Charts, Cycle Engineers' Institute (CEI) - which metamorphosed into British Standard Cycle (BSCY) used a 60 degree thread angle. Which makes 1/2" UNF / CEI the same. Some sizes were dropped when the new standard was compiled. My chart doesn't show 1/2" CEI. Confused ...
by Bob.Murphy
Fri Jun 21, 2019 11:18 am
Forum: Four stroke
Topic: Lathe user?
Replies: 19
Views: 745

Re: Lathe user?

Right, The threads mentioned have the following pitches: British Standard Whitworth (BSW) = 1/2" x 12 British Standard Fine (BSF) = 1/2" x 16 Unified Fine (UNF) = 1/2" x 20 British Standard Cycle Thread (BSCY) = 1/2" x 26 BertieB is using a Tiger Cub rear hub in his 'LF'. I have ...
by Bob.Murphy
Wed Jun 19, 2019 10:46 am
Forum: Four stroke
Topic: Lathe user?
Replies: 19
Views: 745

Re: Lathe user?

Thanks folks, As I thought - BSCY it will be.

All the dimensions on the CAD drawing are in MMs ( :? ), fortunately I have a couple of Tiger Cub spindles and will use them to get the accurate dimensions.

Ariel spindle (1).pdf
(65.72 KiB) Downloaded 18 times


I'll try to get Bertie's approval before I proceed though ;) .

Bob.
by Bob.Murphy
Wed Jun 19, 2019 10:29 am
Forum: Main Chat Forum
Topic: Man and sloper come a cropper.
Replies: 14
Views: 763

Re: Man and sloper come a cropper.

Glad to hear that you are on the mend and hope you make a full recovery and get back on the bikes. From (thankfully limited) experience, the priorities after an 'off' are: 1. Rush to the bike. 2. look for your passenger. 3. Eventually think about yourself. :lol: Chin up - and keep posting on here, w...
by Bob.Murphy
Tue Jun 18, 2019 11:25 am
Forum: Four stroke
Topic: Lathe user?
Replies: 19
Views: 745

Re: Lathe user?

Folks, BertieB sent me his CAD drawing and it shows the wheel spindle threads as 1/2" Whitworth. I think this would be too coarse and should maybe be 1/2" BSF or BSCY. I have send him two PMs but they're still sitting in my outbox so he isn't watching this site at the moment. Any thoughts ...

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