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Re: accuracy is off
« Reply #10 on: June 11, 2018, 07:48:51 AM »
ger21 I did in post #7

Offline Tweakie.CNC

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Re: accuracy is off
« Reply #11 on: June 11, 2018, 08:08:43 AM »
Hi Mike,

The attachment in post #7 is not good. You need to attach your actual Gcode file (it has the file extension .tap, .nc, .txt, etc.).

Tweakie.
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Re: accuracy is off
« Reply #12 on: June 11, 2018, 08:11:38 AM »
Sorry about that Tweakie: I will work on it right away
Re: accuracy is off
« Reply #13 on: June 11, 2018, 08:16:02 AM »
Try this one, ( Ihope I got it right)

Offline RICH

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Re: Re: accuracy is off
« Reply #14 on: June 11, 2018, 09:07:11 AM »
Mike,
This is a backplot of the gcode you posted. Don't think it's the correct one for the pictures you attached ........

RICH
Re: accuracy is off
« Reply #15 on: June 11, 2018, 09:58:28 AM »
Hi Rich: That is the file I am having trouble with, the outside DIA. is supposed to be 12.5, the ID of the pockets is supposed to be 2"

the pockets keep coming out 2  1/16" and the OD is 12.375"

Offline Tweakie.CNC

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Re: accuracy is off
« Reply #16 on: June 11, 2018, 10:34:23 AM »
Hi Mike,

You mentioned in post #5 that your outside diameter was not completely round (my out side dia. is supposed to be 12  1/2" well in Y axis its 12  1/2 but in X its 12  3/8"). Checking your Gcode indicates that Mach3 will be following a toolpath which will produce equal dimension in both the X and Y planes and this is confirmed by the Program Limits of +/- 6.3438 (shown in the toolpath screen).

It would appear that you have a mechanical issue with your machine (backlash or flex, etc) which is causing the inaccuracy in the machined dimensions.
Perhaps ensure that the cutter you are using is truly 'sharp' and possibly reduce the feed-rate or depth of cut to reduce the loading on your machine components.

Hope this helps,

Tweakie.
KEEP SAFE !

Offline ger21

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Re: Re: accuracy is off
« Reply #17 on: June 11, 2018, 11:02:09 AM »
The toolpath for the large circle is for a 12-11/16" diameter circle. Subtract 1/4" for the bit, and you get 12-7/16".

So either your drawing is incorrect, or the toolpath parameters are incorrect.

I don't have time to look at the pockets right now, but I'm guessing it's a similar issue.
Gerry

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http://www.thecncwoodworker.com/2010.html

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Offline ger21

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Re: Re: accuracy is off
« Reply #18 on: June 11, 2018, 11:04:07 AM »
The outside diameter is also made up of a combination of arcs and straight segments, which would point to an incorrect drawing.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: accuracy is off
« Reply #19 on: June 11, 2018, 03:19:08 PM »
Thanks guys for all your help, I will go back and re-do my drawing and recut