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diamond screw design
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Posted by: efendy

05/14/2008, 05:41:56

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does anybody know anything about diamond screw? is the design the same as the lead screw design? i didn't find any text about it on the internet. but if i'm not wrong, the diamond screw is also called yankee screw. please anybody help me on this.







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: diamond screw design
: diamond screw design -- efendy Post Reply Top of thread Engineering Forum
Posted by: kotasasi

06/07/2009, 15:56:52

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Can any one help me in designing a daimond screw for using in levelwind for winch application.







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Posted by: jboggs

05/14/2008, 09:48:46

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I know what a "yankee screwdriver" is. Is that what you mean? Come to think of it, the threads on the shank are in kind of a diamond shape. Maybe that's where that name came from.

You don't see them much anymore, because of all the battery powered drivers now. The basic idea is that you have a spiral threaded shank that slides into and out of a handle. An internal spring pushes it outward. The spiral grooves on the shank engage teeth on the bore of the handle so that as it slides in and out of the handle, it is forced to rotate. A bit holder is attached to the end of the shank. To operate it you simply insert the bit into the screw head and press on the handle. The bit rotates the screw. I grew up using these things with my dad. They were indispensable tools for the handy man.


Check here: http://www.nickh.org/yankee/

You can even find them at amazon.com








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Posted by: efendy

05/15/2008, 00:40:16

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thanks for the reply.. but that's not what i meant. this one is used normally on a level wind assembly where the umbilical will be winded accordingly on a drum. the umbilical guide will move to the right until the end of the screw and then it will move again to the left because of the diamond arrangement of the screw. in addition, it looks like a lead screw but has left hand and right hand (for you to visualise) thread on the same body.but i think the concept is the same to what you mentioned






Modified by efendy at Thu, May 15, 2008, 04:47:22


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Posted by: Kelly Bramble

05/15/2008, 07:52:56

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efundy,

Post a picture or diagram for us. "diamond screw" may be have be a company or specialized product name goven in the past.








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Posted by: Marky

05/15/2008, 08:42:36

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Yes...it's the same as a lead screw. It's simply a ball screw with large lead. The diamond pattern is just a cross groove so the handle or nut can make a quick return....hense the up and down motion on a Yankee Screwdriver.







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Posted by: efendy

05/15/2008, 22:12:53

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thanks all for the reply, this is actually the problem:
I'm hoping you can help me out with some technical advice on some of the basic principals of level wind diamond screw design.

We are designing the level wind assembly for our new Top Hat TMS (tether measurement system), I would appreciate your advice on the design of diamond screw in particular the relationship between the drum width, the number of raps on the drum and the number of turns and centre distance of the diamond screw itself.

Current design data is as follows.

Tether diameter, nom 35+- 1mm. have assumed 36 dia as the basis for the design
The drum core will have lebus type half shells profile for 36mm cable and 22.5 raps, these will probably be supplied by Nylacast and made of PU but may consider Lebus also.
inside distance between drum wings 810mm = 22.5 raps
Diamond screw travel, = 22.5 - 1 x 36 = 774mm (is this a correct assumption?)
Diamond screw pitch will be 2 x tether diameter. = 2 x 36 = 72mm, number of turns on diamond screw =10.75 = 774mm travel, would 11 turns be OK.
To allow for small variations in tether diameter say + - 5mm the gearing ration between the drum and the diamond screw can be adjusted by changing the sprockets sizes.
Do you know of any design data, text books or designers manuals for the diamond screws, who would be the best supplier to seek advice from and to manufacture the screw.
I was considering Lebus, also there was a company in Hull I have used in the past but cant remember there name.
Appreciate any advice you can offer.

i attached the basic drawing of this diamond screw


diamond_screw.JPG (83.8 KB)  






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Posted by: Reigns

04/04/2010, 22:39:42

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Hi Efendy

You got your answer? Would you like to share with me?








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Posted by: MARKING

04/10/2010, 02:01:55

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Hi

If you want to know more photos and more information of winch diamond screw shaft and nut, you may search "Dalian Dehua" on/in "google map" or 'google webpage".


1_THE_INTEGRAL_SPOOLING_SHAFT_OF_WINCH.JPG (110.0 KB)  






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Posted by: MARKING

04/09/2010, 22:43:09

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Hi

Isend a photo of winch spooling nut to you for your reference.


1_THE_PAWLS_OF_WINCHES_.JPG (35.6 KB)  






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Posted by: MARKING

04/09/2010, 22:31:13

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Hi

I can send only one photo to you for each email. I send a photos to you again for your reference.


THE_DETAIL_OF_REVERSE_GROOVE.jpg (96.7 KB)  






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Posted by: MARKING

04/09/2010, 22:18:44

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Hi

I try to send some photos of winch diamond screw shaft to you for your reference. I do not know whether to send success.


THE_INTEGRAL_WINCH_SPOOLING_SHAFT.jpg (104.9 KB)  






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Posted by: Reigns

04/11/2010, 22:17:23

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Hi

Thank you.

I did not receive your email.

My email is reignwars@hotmail.com

Can you resend again?








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