# little circles

*little circles*was created by

*martyop*

The little circles look sort of like lemons tilted so the ends are at 30 and 210 degrees.

What's up with that?

Thanks,

Marty

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*andypugh*on topic

*Re:little circles*

**martyop wrote:**

Is it possibly a backlash problem?The little circles look sort of like lemons tilted so the ends are at 30 and 210 degrees.

I assume they don't look like lemons on the Axis preview?

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*BigJohnT*on topic

*Re:little circles*

Slow feed in plastics usually will just melt the plastic and not cut cleanly. I would suggest a larger single flute end mill for the job.

John

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*martyop*on topic

*Re:little circles*

Thanks,

Marty

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*andypugh*on topic

*Re:little circles*

**martyop wrote:**

Does the mill use ballscrews or ordinarily leadscrews?Your assumption is correct. Maybe backlash is the problem.

I think that some folk have found that there is a big improvement to me had with the Taig mills by paying attention to the thrust bearings.

Backlash compensation might help, but is rarely an ideal or complete solution.

www.linuxcnc.org/docs/2.4/html/config_in...b:%5BAXIS%5D-section

Sections BACKLASH and COMP_FILE

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*martyop*on topic

*Re:little circles*

G17

M3 S1000

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G1 X1.64872

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G3 X0.8053 Y-0.272 I0.0 J-0.4

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*martyop*on topic

*Re:little circles*

G17

M3 S1000

G0 X0.19896 Y-0.0672

G0 Z0.1

G1 F10.0 Z-0.4

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G2 X-0.19896 Y-0.0672 I0.105 J0.18187

G3 X-0.22427 Y0.0 I-0.98531 J-0.3328

G3 X-0.19896 Y0.0672 I-0.96 J0.4

G2 X-0.105 Y0.18187 I0.19896 J-0.0672

G2 X0.19896 Y0.0672 I0.105 J-0.18187

G3 X0.22427 Y0.0 I0.98531 J0.3328

G3 X0.19896 Y-0.0672 I0.96 J-0.4

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G2 X-0.19896 Y-0.0672 I0.105 J0.18187

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G2 X-0.50213 Y-0.1696 I0.265 J0.45899

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G2 X0.50213 Y0.1696 I0.265 J-0.45899

G3 X0.58561 Y0.0 I0.68214 J0.2304

G3 X0.50213 Y-0.1696 I0.59867 J-0.4

G1 F10.0 X0.8053 Y-0.272

G2 F50.0 X-0.425 Y-0.73612 I-0.8053 J0.272

G2 X-0.8053 Y-0.272 I0.425 J0.73612

G3 X-1.18427 Y0.0 I-0.37897 J-0.128

G1 X-1.65

G1 X-1.18427

G3 X-0.8053 Y0.272 I0.0 J0.4

G2 X-0.425 Y0.73612 I0.8053 J-0.272

G2 X0.8053 Y0.272 I0.425 J-0.73612

G3 X1.18427 Y0.0 I0.37897 J0.128

G1 X1.64872

G1 X1.18427

G3 X0.8053 Y-0.272 I0.0 J-0.4

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*martyop*on topic

*Re:little circles*

Are there ball screw kits for the Taig?

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*btvpimill*on topic

*Re:little circles*

Backlash would show as flats on each reversal of a screw and it doesn't really look like that is the issue.

I suggest you go with Johns idea and use a bigger mill. Or get a finish pass in there if its not already. If it is, then it needs to be bigger.

You could reverse the direction of cut, it may help.

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*BigJohnT*on topic

*Re:little circles*

I assume that both programs are the same... btw it is much nicer to attach your G code to a message rather than include it in your message unless it is real short... makes reading easier not having to scroll a zillion miles to the top after scrolling to the bottom.

John

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