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Author Topic: Smoother Radi's  (Read 4994 times)

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Offline SScnc

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Smoother Radi's
« on: July 09, 2009, 09:25:12 AM »
I built my own CNC mill which works great. My only concern is that when i cut a radius, it leaves a "choppy" finish on the material. Is there any way i can smooth this out? Possibly something i can set with Mach3. Thanks

My setup is Gecko G540, Keling 48v PS, Keling 270oz motors, etc..

Offline Jeff_Birt

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Re: Smoother Radi's
« Reply #1 on: July 09, 2009, 09:37:52 AM »
Sounds like you have a lot of backlash/slop in your drive system. Have you measured your backlash.
Happy machining , Jeff Birt
 

Offline RICH

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Re: Smoother Radi's
« Reply #2 on: July 09, 2009, 10:46:19 AM »
You could make a rough and then do a finish cut. Experiment with your particular machine a little to see what works best.
RICH

Offline Hood

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Re: Smoother Radi's
« Reply #3 on: July 09, 2009, 10:57:21 AM »
Is the code an arc or many short lines?
Hood

Offline RICH

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Re: Smoother Radi's
« Reply #4 on: July 09, 2009, 11:03:28 AM »
What program are you using to generate the code?
RICH

Offline SScnc

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Re: Smoother Radi's
« Reply #5 on: July 09, 2009, 12:55:17 PM »
-No Backlash
- I do rough then finish
-Code is an Arc
-I use CamBam Plus

Offline Jeff_Birt

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Re: Smoother Radi's
« Reply #6 on: July 09, 2009, 02:55:51 PM »
Quote
-No Backlash

Impossible, every thing has some amount of backlash! Have you actually measured it with a good dial indicator??

CamBam produces good Gcode. Your fixture/part/machine has to have some excessive sort of slop or backlash OR you are taking way to aggressive a cut.
Happy machining , Jeff Birt
 

Offline SScnc

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Re: Smoother Radi's
« Reply #7 on: July 09, 2009, 03:34:44 PM »
well obviously it has backlash but i have backlash comp on. Its less then .0002 on each axis.

.010 finish cut, climb milling.

Offline Hood

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Re: Smoother Radi's
« Reply #8 on: July 09, 2009, 05:14:56 PM »
What is your step per unit?
Hood

Offline SScnc

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Re: Smoother Radi's
« Reply #9 on: July 09, 2009, 08:13:38 PM »
not sure of exact numbers but it is around 10k