I am banging my head against the wall trying to make the ChilliPeppr logo

CAD & CAM Tool Chain ChiliPeppr
1

I am banging my head against the wall trying to make the ChilliPeppr logo to come out correctly, and other simple item like circles. First, let me clarify I got the bug watching all the neat thing you guys are making with ChilliPeppr and inexpensive CNC, I had to make one. I build an OX CNC 1000mm X 1000mm. But I am new to this. I am using a TinyG v8 to control the hardware. Before that I tried Grbl v3 with an Arduino Uno and got the same results with both. I can send the CP logo 20 times and it repeats exactly the same. I send it at 2x, 5x and even 8x and the output is the same.

Below are pictures of the CP logo, a dust boot I tried to make and my new CNC. Any help will be much appreciated.

I can post my TinyG configuration and any detail required to help me troubleshoot my problem, if someone is willing to help.

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2

Looks fine to me. Your pen probably just has a lot of flex in it

3

Hi John. Thanks for responding so fast. I will try with an actual router bit and see if the machine works as it should.

4

I’m with John. Try a bit on some soft wood and see if you have better results. Nice job on the CNC build. I would love to build an Ox.

5

Unfortunately, the result is the same as with the pen. Just a little less pronounced.

Below is a link to the picture using a router bit on MDF. I painted the board black to see the result better.

https://drive.google.com/folderview?id=0BwgLt7nqnQlyWWdzeUxlZzlObFk&usp=sharing

6

Have you tried the test in different areas along your work bed?

7

It seems like perhaps your timing belts are slipping. Did you make sure you really tightened down the stepper motor shaft connection?

8

+Phil, thanks I enjoyed building it. The first real test was on MDF after John’s recommendation but so far same results.

+Alex, Yes, I have done 3 side by side even different router bits and no improvement.

+John, the belts are as tight as they can be. There is no backlash and no slipping on them. Included in the link is a pic of the XY axis. If you look closely the belt on the X axis, it wraps around the pulley 180 deg. I think I am going to change the X axis stepper try it and if no change then the Y axis. Y/N?