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View Full Version : milling machine end cut texture?



monfoodoo
11-17-2005, 09:15 PM
Can a texture be acheived in the surface editor to resemble a circular mill cut, on the end of a cylinder? (metal,that is). Like it was lathe cut. scott

Wonderpup
11-18-2005, 02:02 AM
Hi monfoodoo,

It might be worth looking at the BRDF shader, perhaps in combination with bump maps to get this sort of effect.

GwynneR
11-18-2005, 02:55 AM
Essentially what you need is something that will give you very fine pitched concentric circles, ripples2 as a bump should do the job if you fiddle with the settings. eg if you have a cylinder of diameter 20mm, try wavesources: 1, wavelength: 0.0002, wavespeed: leave at default, texture value of around 15 to 20% and scale @ 1mmx1mmx1mm should give you something to work with.

Caveat - those settings will give you a surface that resembles the end of a cylinder 'faced off' on a lathe. The surface you'd get from milling the end of the cylinder flat is completely different.

The proof, as they say, is in the pudding, here's a quick test image. Not too bad but could be improved - there's no BRDF or Fresnel used on it, it's just the default cold steel surface included with lightwave but with the bump replaced by ripples2

http://www.robotbuilder.co.uk/forum/userdata/agog/lathedcylinder.jpg

MooseDog
11-18-2005, 06:31 AM
Radial Noise (http://www.andynicholas.com/thezone/index.php?area=downloads) :thumbsup:

look about 2/3 of the way down the page for the procedural texture.

GwynneR
11-18-2005, 07:12 AM
That's vcool, but not quite what you want for a lathed surface, it's too noisy and irregular. Depending on how good you are with a lathe, the surface should be a highly regular spiral groove (constant feed rate of the cutting tool), or a series of concentric circles. There's very little random noise as the cutting tool is always cutting exactly the same profile for the groove/s across each individual pass. Wicked texture for brushed metal though.

PeteF
11-18-2005, 09:53 AM
The cut should represent something like the grooves in an old LP record. A continuous spiral outwards (rather than a ripple effect of even spacing), with a given angle, relative to the rate the tool was fed across the face of the part, and the spindle speed.

http://vbulletin.newtek.com/attachment.php?attachmentid=24791&stc=1
Lathe.jpg

While on the subject, we usually cut with a bandsaw:

http://vbulletin.newtek.com/attachment.php?attachmentid=24792&stc=1
Band_saw.jpg

Finally, we use something called a surface gauge:

http://vbulletin.newtek.com/attachment.php?attachmentid=24793&stc=1
GAR_surface_finish_gauge.jpg

The benefits of having a mechanical engineering background, with a machine room one floor above.

Pete

GwynneR
11-18-2005, 02:34 PM
Grrrr, now I'm jealous, bought my first lathe about a year ago to turn up wheel hubs, wheels and sundry bits and pieces for the robots I build with my kids. Being a beginner and using a hobby lathe mine rarely have a single spiral and often end up witha series of short spirals and concentric circles :D Could really do with a bandsaw though.

monfoodoo
11-18-2005, 09:25 PM
radial noise plugin seems to be just the right thing for what i need.thankyou!
And thanks for the other replys. scott