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Author Topic: constant velocity same as css??  (Read 1263 times)

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constant velocity same as css??
« on: March 29, 2015, 10:14:21 AM »
Literature that i am reading refers to "constant velocity"  Does anyone know if constant velocity
and constant surface speed is the same thing??

regards

fred evans
think of the trees-- use both sides of the computer paper

Offline RICH

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Re: constant velocity same as css??
« Reply #1 on: March 29, 2015, 11:01:23 AM »
hmm.....
Constant velocity is constant speed, but remember that velocity is a vector so that it has direction associated with it.
But that said......
Constant surface speed would relate to movement at a rate with no change in the rate while constant velocity in Mach
relates to trying  to maintain a constant speed throughtout all the movements ie; around a turn.

My 2 cents if it's anything to ya, :)

RICH
Re: constant velocity same as css??
« Reply #2 on: March 29, 2015, 11:08:35 AM »
Thanks Rich-- makes sense in the context that I was reading it
so constant velocity could mean same velocity around corners??
while css refers to the speed of the cutting edge on a facing cut

If i am using CSS and am machining a rod on the outside diameter taking
multiple cuts will the spindle speed adjust as the rod diameter gets
smaller after each cut??
 
think of the trees-- use both sides of the computer paper

Offline RICH

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Re: constant velocity same as css??
« Reply #3 on: March 29, 2015, 11:59:50 AM »
I don't have a variable speed drive on anything.
One of these day's.... so someone who uses one can tell you exactly how well CSS works for the lathe and mill.
Yes, the speed should change as things get smaller ie; doing a facing cut or  cut off on the lathe.


Quote
constant velocity could mean same velocity around corners


Mach will try, there is a info on CSS and associated config settings. Do a search to find.

link to info:
http://www.machsupport.com/forum/index.php/topic,7923.msg50240.html#msg50240

RICH
« Last Edit: March 29, 2015, 12:04:20 PM by RICH »
Re: constant velocity same as css??
« Reply #4 on: March 29, 2015, 01:00:49 PM »
I use "CSS" all the time & it works fine for what it does: spindle speed increase/decrease proportional to the work diameter & chosen SFM using a constant feed rate of the tool.  G95 Feed per rev does not work though which means it's not true CSS.  For my piddlin' projects, it doesn't really matter that much.  You do have Mach3 v.062/piddlin right?;)
Milton from Tennessee ya'll.