Hi, thanks to all.
My original question is what markrief answered. Sorry for not being clear. However I got doubt on its usage on machine tool when joycejo posted his first reply. So I added that as well. I agree with what others said about requirement of machine tool. But I think more...
Many Thanks to Tingsryd & joycejo.
Can you explain what is this conversion to triangulation?
Also will the parameters generated by NURBS toolpath same as those that are defined for NURBS surface in CAD? Or will it reconstruct a new NURBS surface? I mean if I know the NURBS parameters from CAD...
Hi,
I have a doubt regarding toolpath generation in CAM software in general. Modern CAD/CAM systems represent surface and solid data in NURBS form. But while generating tool path does CAM software use NURBS data directly or does it convert NURBS data to Triangulation format? I heard that some...
berkshire - Thank you. But 0.001" sounds pretty high. Are you really sure on this?
Secondly, in addition to initial preset people are using this to check final part dimensions after machining on the machine itself. It's here I've doubt that how well these values match with that of CMM measured...
I have seen another recent thread in this forum where the author was asking about using a CNC machine as CMM also. And someone suggested that 'statically' CNC machine would give ~5 micron accuracy. But is this not too high a variation? And if this concept is used on large milling machines where...
Hi,
I have a doubt regarding on-machine probing, I mean using touch trigger probes on CNC machines. Considering that machine tools themselves are not that accurate and repeatable, how can we rely on results given by a probe mounted on the machine tool spindle? Isn't a CMM probe more accurate...
Hi, thank you.
I am doing peripheral (end) milling on a hollow cylinder. So it is essentially G2 code.
I mounted an accelerometer on the cylinder and measuring vibration and taking FFT later.
So ideally we would expect a bending mode as Mike has told. I also expected the same. But we have to...
Thanks Brian. I agree with that. But my doubt is why does the frequency varies. I mean for some revolutions in succession only bending mode is dominant. And then for some revolutions only torsional mode and for some both are dominant. It varies without any logic. I am not fully understanding...
Hi,
I am analysing the vibration signal acquired during a milling operation in frequency domain. Some times I see first bending mode of tool (of cantilever) in dominant peaks, sometimes torsion mode, sometimes both at similar magnitude.
Considering that a milling process involves cutting with...
Hi,
I have a small doubt - can we have different type elements between same nodes. E.g. Can I have beam element between two nodes and also one of the edges of shell element between the same nodes?
In Abaqus I created beam elements between all the required nodes. Now to create a panel structure...
sdebock, thank you for your response.
Actually the masses being tuned masses (for a frequency), I would like to have them occupy the surface area for that mode shape at antinodes. I am really not sure if I can simply put a point mass at one FE node at each antinode of mode shape.
Can you...
I thought these pictures would clear my explanation
Fig.1 - Total assembly strain map in a mode shape
Fig.2 - Only neoprene sheet with its distorted elements at the location of mass
http://files.engineering.com/getfile.aspx?folder=00915397-3097-4ad5-b5c7-344b2dc8503f&file=Figures.docx
Hi,
I am trying to model a cylindrical casing with a neoprene sheet attached to it (through adhesive tape). Some masses are mounted on the neoprene intermittently, again with adhesive tape, with a hope of anchoring the neoprene.
Objective is to see how far the neoprene sheet and added masses...
