Author Topic: 58 C12 Head Stock  (Read 433 times)

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Offline nightster

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58 C12 Head Stock
« on: May 17, 2019, 07:57:39 pm »
Hi everyone,
                Firstly thanks for the pointers on paint colour, i have (i hope) solved that problem, now i need to remove the head stock races and refit with traditional type,
Does anyone have a drawing of the tool, i don't want to do a bodge i will get one made, i think the thread appears to be be 1 1/2'' x 26 TPI cycle?
Is it a solid tool or is it meant to be a tube?
Thanks all regards Mark.

Offline hampshirebiker

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Re: 58 C12 Head Stock
« Reply #1 on: May 17, 2019, 08:13:51 pm »
If it's for pulling the fork legs up use an appropriately sized piece of timber. Tile batten screwed in for example. Very simple and not a bodge.
Postal - Liphook Hants - But just into West Sussex.

Offline Cosmikdebriis

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Re: 58 C12 Head Stock
« Reply #2 on: May 17, 2019, 08:17:30 pm »
If it's for pulling the fork legs up use an appropriately sized piece of timber. Tile batten screwed in for example. Very simple and not a bodge.

I think it's the head races. Those pesky blighters you can't get a drift on to bash them out. Most of us either weld or drill and punch but Mark is looking to do the job "properly" with the right tool.

Have you tried eBay Mark?
A bike on the road... Is worth two in the shed...

Offline hampshirebiker

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Re: 58 C12 Head Stock
« Reply #3 on: May 17, 2019, 08:30:23 pm »
Good thinking Dave, it wasn't entirely clear to me.
Postal - Liphook Hants - But just into West Sussex.

Offline nightster

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Re: 58 C12 Head Stock
« Reply #4 on: May 17, 2019, 08:56:07 pm »
Hi Chaps,
I have the proper tool for pulling in the forks, to coin the aptly put wording, i do want to do it properly and it is those pesky .......
I thought if i could one made up as i do a lot of this sort of thing with auto transmissions.

Offline nightster

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Re: 58 C12 Head Stock
« Reply #5 on: May 17, 2019, 08:59:51 pm »
Hi Again,
           Sorry should have said, i have looked all over Ebay, i think i would have more luck looking for a set of dentures for a Hen!

Offline Tman

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Re: 58 C12 Head Stock
« Reply #6 on: May 17, 2019, 09:34:40 pm »
How about Drags for the tool?

Offline Cosmikdebriis

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Re: 58 C12 Head Stock
« Reply #7 on: May 17, 2019, 10:47:10 pm »
The thing is. even if you make a tool I'very much doubt it would last long. It only gets to wind in a couple of turns so I would expect the threads to wear out pretty quickly.
A bike on the road... Is worth two in the shed...

Offline nightster

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Re: 58 C12 Head Stock
« Reply #8 on: May 17, 2019, 11:44:08 pm »
Yes, i get that it might not last to long, thanks for that idea, best get it hardened, as i can't even get any idea of what it looks like i think usual route of head scratching and my own design, may be a drift for getting them out, perhaps another one for putting them in,
I will let you know how it all goes, thanks for all the pointers any way.

Offline Cosmikdebriis

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Re: 58 C12 Head Stock
« Reply #9 on: May 17, 2019, 11:54:29 pm »
On the basis you are probably replacing the races and so the old ones are scrap. Some people weld a bar across the old ones and drift them out. Works fine if you have a welder.

Personally I drill a (small) hole discreetly in the frame so that you can insert a thin punch (or old drill bit) and punch them out. Obviously this causes damage to the frame and, if it's been recently painted, can make a mess of the paint job, but a bit of filler in the hole can make it invisible and, if you leave enough of a dimple, you can re use the hole for next time (not that many of us are likely to be around next time a headrace bearing needs replacing of course). Personally I just leave the hole open. You'd need to be a proper rivet counter to find it and, I couldn't give a flying fig if someone did see it.
A bike on the road... Is worth two in the shed...

Offline nightster

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Re: 58 C12 Head Stock
« Reply #10 on: May 18, 2019, 07:04:51 am »
Thanks for that, i think i will still have a go at a tool, i am removing the old cups prior to powder coating, so a little heat applied wont hurt to assist getting them out,
When it comes to putting the new ones in i will put the cups in the fridge overnight, as  the frame will be powder coated then,
thanks all Mark.

Offline timsdad

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Re: 58 C12 Head Stock
« Reply #11 on: May 18, 2019, 07:36:05 am »
Whereabouts in the world are you, Mark?

I've got a tool for removing the bearing cups that you can borrow to use or copy that a pal made for me. We had a tool that Richie, a former Forum member made that I finished up with, to send out to folk for a site donation but the last member to borrow it failed to return it. My computer was replaced soon after and I have no idea who it was so the forum tool got lost into a private tool drawer.

The tool is just a round bar with a tommy bar hole on one end and a cycle rate male thread on the other. It screws into the bearing cup and allows a sturdy drift to tap it out.


Ray
Just a motorcyclist.

Offline Cosmikdebriis

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Re: 58 C12 Head Stock
« Reply #12 on: May 18, 2019, 08:54:20 am »
Did we ever find out if the bottom bracket cup on an old push bike was the correct size? One side is a LH thread but the other should be okay.

https://www.ebay.co.uk/itm/5-PIECE-CYCLE-BIKE-BOTTOM-BRACKET-CUPS-BEARINGS/351859631336?epid=1089411607&hash=item51ec77e4e8:g:NPUAAOxyJ8ZRgKxT
A bike on the road... Is worth two in the shed...

Offline nightster

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Re: 58 C12 Head Stock
« Reply #13 on: May 21, 2019, 09:31:32 pm »
Sorry people, my lack of reply for a couple of days, work commitment, you know the boring stuff that pays for the tinkering around, my wife is saying she is becoming a bike widow, good job we haven't started on the two Enfields or the Ariel, as i pointed out smugly i had bikes before i met you, seemed a good reply to me!
Anyway i digress, thanks for the info on the tool, i have the engineering shop on standby and will use the new bearings as the pattern when they arrive,
I will keep you up to date as we go, thanks all Mark.

Offline Tman

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Re: 58 C12 Head Stock
« Reply #14 on: May 22, 2019, 08:59:06 am »
It's possible to overthink these things sometimes. Just weld (or get a mate to weld) a piece of scrap across the outer cups and twat 'em out with a hammer and drift, then just gently tap the new ones in slowly and squarely until the note changes. If it took five minutes end to end you must have stopped for a cup of tea in the middle.
No need for any engineering shop input!