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diamond screw design | |||
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Posted by: efendy ® 05/14/2008, 05:41:56 Author Profile eMail author Edit |
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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Posted by: kotasasi ® 06/07/2009, 15:56:52 Author Profile eMail author Edit |
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 Author Profile eMail author Edit |
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.
Some pictures here would be nice. Eventually. They predate modern "power drivers" by decades -- I have several Yankee screwdrivers that are almost 100 years old, and are still 100% functional. There seem to be three primary sizes of Yankee drivers, I'll call them "small" (around a foot long, extended), "medium" (around a foot and a half, extended), and "large" (over two feet long, extended). The small ones are the size of a conventional screwdriver, and do not always have a lock on the spiral action. The medium size ones are my favorite -- long enough to do the job, not so long as to be considered a weapon. The large ones are...large. They do a job wonderfully, but they can have clearance issues. For most uses, the medium sized ones are my favorite, but I have a large one I like. I just don't carry it with me. Curiously, some of the "non-Yankee" push screwdrivers seem to follow these same basic sizes. There is also what could be called an "Extra Small", which feels like a "home" oriented tool to me, which has a much shorter "push" than the "bigger small". Many of the "Extra small" Yankees I've seen have a handle that unscrews permitting the storage of bits (both screwdriver and drill) with the screwdriver; a very nice feature on what is otherwise a tool I've not found overly useful, as the shorter "push" just doesn't seem to do much for me. Bits One issue you may experience with the Yankee to Hex bit adapters is the fact that hex bits are designed to deliver torque to the bit, but provide easy removal of the bit by simply pulling on it. The problem with this is a Yankee screwdriver can apply a force to the bit in other directions -- most notabily, when releasing the spiral mechanism, they will often throw a hex bit out of a magnetic adapter, and launch it across the room (ok, usually only a few feet, but usually enough to toss your most unique and important bit into an unrecoverable place). The standard Yankee mount both provides twisting force to the bit, but also securely holds the bit in place. Some of the Yankee to hex bit adapters do provide various ways of holding the bit in place beyond a magnet -- sometimes, a screw-down collar, in other cases, a spring retainer. The Spring Thing Why care about Yankee Screwdrivers? Plus, there is just something retro-cool about working on a brand new computer with an 80 year old tool. Non-Yankee Yankee-style tools New Yankee Screwdrivers Garrett Wade now says that "Stanley has stopped production of all Yankee Screwdrivers". Sounds like the end of an era. Yankee Resources Yankee Screwdrivers in Art and Literature Tell me your Yankee Screwdriver stories, and let me know if I can add them to this page, and how to attribute them to you. (In general, you probably don't want me to post your e-mail address unless you are already something of an often spammed Internet celebrity.) You can even find them at amazon.com |
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Posted by: efendy ® 05/15/2008, 00:40:16 Author Profile eMail author Edit |
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 Author Profile eMail author Edit |
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 Author Profile eMail author Edit |
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 Author Profile eMail author Edit |
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
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Posted by: Reigns ® 04/04/2010, 22:39:42 Author Profile eMail author Edit |
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 Author Profile eMail author Edit |
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".
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Posted by: MARKING ® 04/09/2010, 22:43:09 Author Profile eMail author Edit |
Hi Isend a photo of winch spooling nut to you for your reference.
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Posted by: MARKING ® 04/09/2010, 22:31:13 Author Profile eMail author Edit |
Hi I can send only one photo to you for each email. I send a photos to you again for your reference.
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Posted by: MARKING ® 04/09/2010, 22:18:44 Author Profile eMail author Edit |
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.
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Posted by: Reigns ® 04/11/2010, 22:17:23 Author Profile eMail author Edit |
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