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saloon table clamps

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Brigitte View Drop Down
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Post Options Post Options   Quote Brigitte Quote  Post ReplyReply Direct Link To This Post Topic: saloon table clamps
    Posted: 06 Feb 2014 at 2:34pm
I am in the process of machining a new clamp for the old post style saloon table banjo as we only have the broken off thread of one of them.  I know the diameter of the thread is about 8mm  but I stupidly forgot to bring the stump home to confirm what flavour of thread I'm dealing with.  I called JR and they said it would be an imperial thread, but couldn't be more specific

I am currently some distance from the boat and not expecting to go back for a couple of weeks so I was hoping that somebody here might be able to enlighten me?  I really want to get on with the job.

Any help most gratefully received!
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Dolphyn View Drop Down
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Post Options Post Options   Quote Dolphyn Quote  Post ReplyReply Direct Link To This Post Posted: 18 Feb 2014 at 3:48pm
Hi,

I just saw your message. Our table is at home for veneer repairs, is from 1978 and looks completely original.
I measured the tread of the clamp that is attached to the table itself and concluded that is a regular M8 thread.
Diameter was 7.7mm (thread is a bit worn), and pitch is 8 revs per cm.
I checked with an M8 nut and that fits fine. I also checked the knob with an M8 bolt and that went fine too.

I hope this helps (and is in time).
Winfried Donkers
Dolphyn, CO618
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Brigitte View Drop Down
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Post Options Post Options   Quote Brigitte Quote  Post ReplyReply Direct Link To This Post Posted: 25 Feb 2014 at 8:30am
Thanks very much - that's really helpful. It'll be so nice not to have our table swivelling about at sea!
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JohnF View Drop Down
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Post Options Post Options   Quote JohnF Quote  Post ReplyReply Direct Link To This Post Posted: 25 Feb 2014 at 3:20pm
Hi, I'm not sure if I can help - it depends if we're talking about the same part - I needed to replace two bolts or grub screws low down on the column base to the floor, not the bolt with a plastic knob which tightens the clamp on the column itself. I went through an issue a couple of years ago as the relevant bolts had been lost by a previous owner. in the end confirmed that on mine (built 1977) the threads on the base were indeed imperial, quite unusual and a particularly difficult to obtain now. Today I can't find the note of what I needed, but in the end found that I could get hold of a couple of grub screws which were actually being sold as spares for a Vincent motorcycle! If this the part you need, I'll try to find the detail.
It might also be useful to you to know that Toomer & Hayter supply all sorts of bits for tables, pedestals and seats,  at http://www.toomerandhayter.co.uk .
Let me know if details of my screws might help.
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Brigitte View Drop Down
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Post Options Post Options   Quote Brigitte Quote  Post ReplyReply Direct Link To This Post Posted: 25 Feb 2014 at 9:00pm
Hi John, thanks for the kind offer and the link.

I do indeed need to make a bolt with associated handle that tightens the upper clamp on the base of the table, not grub screws. The lower, identical clamp is tightened with a piece of polished half inch stainless steel bar, simply formed with a bend and a thread at one end (no plastic)- I have no idea if that is original but I have a lathe and machining something similar isn't a problem.

Given the continuing uncertainty, I have resigned myself to retrieving the broken part this weekend just to be sure.
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JohnF View Drop Down
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Post Options Post Options   Quote JohnF Quote  Post ReplyReply Direct Link To This Post Posted: 26 Feb 2014 at 9:59am
No problem, sorry my grub screw wasn't relevant - you might in any case find the source useful, it's the best place I've found for really odd imperial nuts & bolts - the Vincent Owners Club Spares Co. at:
https://vocspares.mamutweb.com/
Good luck with the table.
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Brigitte View Drop Down
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Post Options Post Options   Quote Brigitte Quote  Post ReplyReply Direct Link To This Post Posted: 05 Mar 2014 at 6:42pm
Just to say that I've confirmed the threads are 8mm metric. In case anyone wanted closure...
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