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What is the technical name of threaded rod with left and right hand threads?
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* November 25, 2012, 06:21:38 AM
Hi,

I am looking for the NAME, of the threaded rod type, that has left hand threads on one end, and right hand threads on the other end.  For example, the type of rod commonly found in precision drafting "bow compasses", of which the user turns the thumb wheel (which is welded to the middle of the rod), and the rod pulls the two arms of a compass toward or away from each other via trunnion nuts mounted in the compass arms.

Is there a specific, industry standard name for this type of rod?  I have been looking for this type of rod for a long time on google. but don't know what to call it...

I am not necessarily looking for a supplier of such, I just need to know what is the official technical name of the rod, the name or names mechanical engineers or draftpeople call it...in other words what would you call it in a detailed drawing...
« Last Edit: November 25, 2012, 09:56:23 AM by nadsab »

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November 25, 2012, 07:01:24 AM
#1
The plumbing fitting that consists of a left & right hand threaded nipple and a left & right hand threaded coupler is simply called a left-right union. But you would be ok to call the part you are describing a turnbuckle. Turnbuckles usually have an open component with left and right threads in the middle, but can be made with a threaded rod in the middle.
« Last Edit: November 25, 2012, 07:04:03 AM by mike mahan »

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mike
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* November 25, 2012, 09:24:08 AM
#2
Thanks.

I've viewed turnbuckles on line, is the term "turnbuckle" generally the part in the middle that pulls or spreads apart the two rods?  Or is it the rod itself?  Or the entire assembly?

Should I call the rod itself a "Turnbuckle Rod"?
« Last Edit: November 25, 2012, 09:42:25 AM by nadsab »

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* November 25, 2012, 10:39:02 AM
#3
I am not necessarily looking for a supplier of such, I just need to know what is the official technical name of the rod, the name or names mechanical engineers or draftpeople call it...in other words what would you call it in a detailed drawing...
Would  drawing compass with thumbscrew adjustment satisfy your quest?

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Even a mistake may turn out to be the one thing necessary to a worthwhile achievement Henry Ford
If I have ever made any valuable discoveries it has been owing more to patient attention than to any other talent Isaac Newton
I have not failed Ive just found 10,000 ways that won't work Thomas Edison


* November 25, 2012, 10:44:48 AM
#4
Yes that is the device that uses the dual left and right handed rod with thumb screw mounted in the middle of the rod, between the left and right handed threads.

What I am trying to find out however, is if there is an industry standard "offical name" or "technical name", for that one individual part in the above.  In other words, what is the technical name of that rod with the thumb screw in the middle?

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* November 25, 2012, 12:38:44 PM
#5
When I Google it up that was the only thing close in technical language terms "drawing compass with thumbscrew adjustment"was used to describe what your after.There is no special term for it from my search,such as official name or technical name for the adjusting screw.Perhaps keep searching maybe something will come up.Or call the compass maker ask them what they call or email them it.Maybe they have a special name for it

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Even a mistake may turn out to be the one thing necessary to a worthwhile achievement Henry Ford
If I have ever made any valuable discoveries it has been owing more to patient attention than to any other talent Isaac Newton
I have not failed Ive just found 10,000 ways that won't work Thomas Edison


* November 25, 2012, 12:44:07 PM
#6
Thanks much.

Closest thing I could come up with is "transverse screw" or "screw rod".  That's most likely the closest I will ever get.

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* November 25, 2012, 12:46:52 PM
#7
Try McMaster-Carr. Look at the Partially Threaded Studs and Rods section on the page. Maybe one of their descriptions will work.

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* November 25, 2012, 12:50:13 PM
#8
Don't know if there's such a thing as a generic term for a specialised item, but I suggest, since it's a bow compass, bowscrew or drawscrew.

*edit*  I found bow screw used as to describe such a screw in an adjuster for an orthodontic plate, here: http://www.dblabsupplies.co.uk/mandibular-bow-screw-114-p.asp

*further edit* It's probably recognised as a type of jackscrew like: http://www.midwestcontrol.com/series.php?id=89
« Last Edit: November 25, 2012, 03:11:21 PM by murray dickinson »

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* November 25, 2012, 05:40:49 PM
#9
Thanks much!  Very interesting especially the dental part.  I guess it could be called a number of different names.

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* November 29, 2012, 10:18:24 AM
#10
How about "bottlescrew" used in the marine industry to tension rigging and guardwires etc.?

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