Neighbour Posted May 16, 2011 Posted May 16, 2011 Hi I have a question and would appreciate any assistance. On the following link: http://img.photobucket.com/albums/v309/Andreii/drawing.jpg I posted the drawing of bolt/screw. I haven't done the drawing because I don't know CAD. There is no milling involved into manufacturing of this bolt/screw which automatically means no groove/slot. I would like to ask if anyone could name the dimensions that I circled blue? For example, 10 = Length of shank. Dimensions like that are very easy and obvious but the ones which I circled blue aren't known for me. 0,3 might be depth of teeth but I circled it anyway because Im not sure and need confirmation. For the close-up view (zoom), I uploaded the jpeg file also: http://www.sendspace.com/file/pnj8kb Hope someone can take a look. Thanks Quote
ReMark Posted May 17, 2011 Posted May 17, 2011 What standards are you using? British/American/Euro/Japanese/other? This is a question that JDM could probably answer in the blink of an eye. Do you have access to a machinist's handbook? Quote
Neighbour Posted May 17, 2011 Author Posted May 17, 2011 Thank you for reply. European standards. I have both Machinery's and ASM handbooks but not "machinist". However I need to repeat again that what I need is the name of dimension (such as ''Length of Shank'' or ''Diameter of Head'' but those two ones are very obvious) and not checking the exactness of sizes. Quote
JD Mather Posted May 17, 2011 Posted May 17, 2011 hello? anyone? Why can't you attach the image here? Quote
Neighbour Posted May 17, 2011 Author Posted May 17, 2011 Why can't you attach the image here? Link to it is in my first post, just click on it. For close up view, I attached the downloading link also. Quote
dbroada Posted May 17, 2011 Posted May 17, 2011 Link to it is in my first post, just click on it. For close up view, I attached the downloading link also.that's OK for you to say but both your image sites are banned by our company IT. Quote
Neighbour Posted May 17, 2011 Author Posted May 17, 2011 that's OK for you to say but both your image sites are banned by our company IT. Hmm ok thanks for the warning. This was the latest subject I thought for. I uploaded it to this message. So regarding the blue circled ones: 0,3 is probably the depth of teeth, but what about the rest four? Quote
ReMark Posted May 17, 2011 Posted May 17, 2011 One looks like it is for a radius ®. Another (max) looks like the depth of the shoulder. "m" is head width? Quote
SLW210 Posted May 17, 2011 Posted May 17, 2011 Why do you need to know? max .1 is for the width of the relief groove that you do not want to worry with. The rest of the blue circled dimension are related to the cross-point screwdriver grooves which you do not want to worry with. Quote
dbroada Posted May 17, 2011 Posted May 17, 2011 in 1974 British standards had this... Pan Head to BS4183.pdf don't know if its of any help though Quote
Neighbour Posted May 17, 2011 Author Posted May 17, 2011 SLW210 I need to know because I have to define the requirements of bolt in text format. Im more familiar with texts, equations and graphs but I don't know much about technical drawings, specially 2D not. So I have to worry about them (those dimensions). ReMark max.1 is probably end of thread which is the remaining between length of shank minut length of thread. ''m'' is not head width/diameter because ''7'' is. ''m'' might be diameter of a groove/slot but I said its no milling involved so it might be free to ignore and not worry about ''m'' but I still need someone to confirm me if this is really diameter of groove/slot. You mentoined radius but which one? As visible on the head but which one on the head? Comparing to the following image of exactly the same bolt (please see the blue circled ones because those are the ones that I have to name): There are on bolt head two different r's (R and r), both are radius. The ''R'' is from previouns picture. ''8'' doesn't have anything to do with radius because, I assume this is angle of teeth. Also at the bottom of the sank, you can see, together with three other dimensions, another radius. Quote
Jack_O'neill Posted May 17, 2011 Posted May 17, 2011 Ok, here's how I read it. Starting in the upper left corner, the r0.9 is the radius that makes the transition between the angled side of the head and the bigger (r6) radius on top. The 8° is the angle that the side of the head is cut at. Detail B shows a recess in the end of the screw that has a 120° included angle, is 0.41 deep and is radiused at the bottom at 0.2. That recess in the end is probably for the benefit of the machine that cuts the threads. A live center from the tailstock of the machine would engage this so that it can cut the threads and the undercut at the head. That "max.1" dim you had circled before. That is there so that the screw will go all the way down and the teeth will engage whatever the screw is being screwed into. The teeth themselves are there to help prevent the screw from loosening up on it's own. If you notice, they are angled so that they will slip as the screw is tightened, but will bite when unscrewing. You might tell whoever draws these things for you that yellow is very hard to see against that white background. Quote
Neighbour Posted May 17, 2011 Author Posted May 17, 2011 Jack yellow is because I converted dwg into pdf with free converter. In the pdf were lines already in yellow. I had to make a screenshot and copy the piece of picture otherwise I couldn't circle to show with which dimensions do I have troubles. About ''2,0-2,46'' and ''m=4,4'' dimension. As far as I understand the first one is the depth of groove/slot and the second one is diameter of groove/slot. Is this correct? If it is then I don't need to care about those two ones because there is no milling. Quote
SLW210 Posted May 18, 2011 Posted May 18, 2011 Jack yellow is because I converted dwg into pdf with free converter. In the pdf were lines already in yellow. I had to make a screenshot and copy the piece of picture otherwise I couldn't circle to show with which dimensions do I have troubles. About ''2,0-2,46'' and ''m=4,4'' dimension. As far as I understand the first one is the depth of groove/slot and the second one is diameter of groove/slot. Is this correct? If it is then I don't need to care about those two ones because there is no milling. You are correct. Quote
Jack_O'neill Posted May 18, 2011 Posted May 18, 2011 About ''2,0-2,46'' and ''m=4,4'' dimension. As far as I understand the first one is the depth of groove/slot and the second one is diameter of groove/slot. Is this correct? If it is then I don't need to care about those two ones because there is no milling. Yes, those all have to do with the slot as Hulk confirmed for you. Sorry to take so long getting back, been on a short road trip. Quote
Neighbour Posted May 18, 2011 Author Posted May 18, 2011 Ok those dimensions that I blue-circled are now figured out. The rest (the ones I didn't circle) are easy to understand so no need of any explanation for them. Thank you to both of you Jack and SLW for your time. Quote
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