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Author Topic: cutting uniform mortise in wood  (Read 1973 times)

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cutting uniform mortise in wood
« on: February 07, 2012, 07:46:51 AM »
i have been cutting a 1x2 inch mortise.
at  1 inch per min.  but i am not getting a uniform cut.
just wonder what adjustment i can make to correct this.
thanks paul
« Last Edit: February 07, 2012, 07:49:37 AM by woodguy7777 »

Offline Hood

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Re: cutting uniform mortise in wood
« Reply #1 on: February 07, 2012, 09:41:53 AM »
Do you have backlash?
Hood
Re: cutting uniform mortise in wood
« Reply #2 on: February 07, 2012, 09:54:27 AM »
Are you referring to mechanical backlash.
like play in the drive gears ?  i will check to see if there is any play there
can the velocity and acceleration setting cause this
thanks paul

Offline Hood

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Re: cutting uniform mortise in wood
« Reply #3 on: February 07, 2012, 11:33:09 AM »
I am not sure exactly what the issue is, it does look in the pic that opposite corners are much more rounded than the other two, is that the problem?
Hood
Re: cutting uniform mortise in wood
« Reply #4 on: February 07, 2012, 12:45:03 PM »
yes hood that is the problem.
the problem seem to happen when the bit goes around the corners
so i am not getting a clean rectangle.
i seem to have this problem anytime i am cutting out a small area.
if i was cutting out a 12x12 area its ok.
it seem as if as the bit picks up speed on the 1 inch side it then suddenly does int the curve  and that is what cause the problem.
thanks again paul
my backlash is set to 20 percent
shopbot cnc stepper motors
« Last Edit: February 07, 2012, 12:58:41 PM by woodguy7777 »

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Re: cutting uniform mortise in wood
« Reply #5 on: February 07, 2012, 02:06:51 PM »
Not sure on backlash settings with the PP as I have never used them but certainly seems like backlash to me.
Hood