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ok, thanks for all the advice! Now it works. pagheca

Hi everyone, I would like to simulate as a start the throw of two dices and want to check how many times I get a certain value from 0 to 12. I used a while loop (see attachment) but it doesn't work as it never exit the loop. N is the number of throws to try. Y[0,P is a vector, j is an index. Z...

got it: I have to specify the index, of course... I was confused by the fact it was a one element vector! Thanks again.

thanks very much, Peter. A very smart solution. However, the result is a vector itself. How to convert it to a number? Thanks again!

Hi, I'm looking for the simplest way to find the index of the element of a vector that is closer to a given value. Suppose the vector is f[i:=i^2 and the value V:40 . The solution is i=6 as 6^2=36. How to find that i value? Do there is any function doing that? Do you know any trick using the...

Thanks for the replies. Reidh: Unfortunately I haven't yet a sample of the material. I'll do extensive tests but, as I have a small budget, I want to understand better before to buy. MintJulep: right, the other material is hardened stainless steel. What I need to know is how Zirconia/steel...

Hi, does anyone know the rolling friction coefficient of any commercially available Zirconia ceramic brand. Thanks in advance for any help

Hi, I have a similar problem, and was wondering if you found a solution. In my case, the speed is very low but we need a system running for very long time and a severe constraint on max friction. Magnetic bearings and Superconducting magnetics bearings cannot be used in our case. Any pointer to...

Thanks for the reply and the advices. Some comments: 1) I can't use any magnetic field around this device as this is part of a detector very sensitive to magnetic fields. 2) If I understood dvd suggestion, what worries about grinding to a vee shape is the resulting dragging of the edges of the...

Reading my post, I understand I've probably been not clear enough... My problem can be described in this way: suppose you have to rotate a disk supporting it from the circumference (= nothing is permitted below or above the disk, except for a cm or so close to the circumference itself). What...

Hi, I have to rotate a disk weighting at about 4 kg, at 12 rev/sec, supporting it from the circunference (dia=300mm). I have to dissipate the minimum possible heat (less than a few W) and work at a temperature of ~ -200 C with dry lubrication. The rotation should keep going maintenance free for...

I found the following problems with MathCAD 11. I have to numerically integrate a function in the form F(f,k,T)=F(exp(-hf/kT)), where h, f, k and T have their own units. Most of you will have already understood I'm dealing with Planck radiation law, however... I would prefer to keep working...

Hi, How to align reference dimensions to a particular directions? I have a quite irregular assembly (so, I can't use the sketch). I need to show the envelope of the assembly (a concept design) aligned to the 3 main axis. If I use a reference dimension, it will show the direct (shortest)...

I couldn't find any information in Dr. Dobb's j. online. Expecially the first pointer in Madcow's reply has been usefull. One information I still miss is the way disks are layered (materials, thickness). I guess patents expired as the technology is quite old. Thanks very much for the...

Hi, I am looking for information about the floppy disk drive technology (yes, the old one): the way data are encoded on the disk, materials and technology disks and heads are made, friction, wearing, lifetime, signal/noise ratio at head/disk level, circuitry for directly reading the signal...

Hi again, Accutrans 3d: apparently this doesn't work. I converted to stl but when I imported the stl in SW the sketch is empty and I got an error (at least one coordinate is negative and I can't figure out how to remove negative coordinates when generating the file). I downloaded the file to...

Thanks for the reply. Do there is a way to attach a file to a post, or do you mean to provide it through a web page or sftp? The latter solution would prove a bit difficult for security reasons at our Department. Cheers, p

Hi, I have to import in Solidworks some DXF files I generated with another program (GRASP, a software for antenna design). The drawings represents some mirror dishes. When I try to File->Open->DXF I get the following message: __________ '<file name>' is possibly an AutoSolid model. It...

Hi Regg, Thanks for your suggestion. Sorry for my bad English. I was talking about an hyperbola. The problem is that I would like to model some optics and parametrize the design of a telescope mount. The idea was to parametrize the optics so that the mount may be adjusted quickly as soon as...

Hi, Do anyone knows any way to draw an hyperbole, guys? A parabola or an ellipse is not enough Cheers & thanks in advance. p