2 pass carving - registration issue with the 2nd pass

X-Carve
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Hi all,

I attempted my first 2 pass carve today - photos attached. This is on a 2nd hand machine (18 mo old) that I acquired. I’ve read previous posts on 2 pass carve registration issues…

First pass was with a 1/8" downcut bit (new). 2nd pass was with a 60 degree v bit.

Material was taped and superglued and definitely didn’t flex or move.

Machine is set to lock motors, and router didn’t move during bit change. I did re-home the machine and used previous XY.

Registration is off to the right by a small amount. I’m wondering if this is a y-axis belt tension or a worn/stretched belt issue. Am I on the right path here?

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Any tips on chasing this down would be appreciated.

Thanks

James

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You’re limited by the precision of the homing switches when you do this. Best practice would be to not home the machine between operations.

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Hi Neil - thanks for your reply. I did another run without re-homing, and the same result happened.

I have checked the machine - the belts seem tight (although I’m waiting for my fish scale to arrive so I can test properly). The v wheels are also all tight.

My next step will be to replace the belt and see if that will fix it…

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try using a ball nose instead of an end mill. That should take your steps away.

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It kinda looks like the vbit used isnt the same angle as the one entered to create the toolpath.

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thanks for the feedback Ken - you’d use a ball nose for the roughing pass? Do you recommend one in particular to balance the issue and overall speed of carve?

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Thanks Seth - I’ll recheck this , and I’ll also check to see if the v-bit tip is centered

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James,

you need to set up multiple g code and/or project pages.

a roughing pass >a finishing pass to where left off with the roughing pass so you’re not cutting air.

CNC first roughing/finish operation - YouTube

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Thanks Ken I appreciate your time and responses - and sorry if I’m slightly obtuse here.

To clarify - you’re saying to do this in addition to the 2 pass carve I set up in Easel? So I hog out roughing pass (1/8" downcut) as a page? Then a "2nd stage rough (ballnose) and a detail pass (60 degree v Bit) as a separate page? The video was just showing a s standard 2 pass - which seems to be similar to what I did in Easel.

Thanks

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Looks almost like one pass was done with a 60 deg and another with a 90 deg

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not Quite, but you’ll need do a couple test run. hit the scrap pile :smile: :grin: :laughing: :innocent:

You will need a larger cutter for roughing one file. then a finishing pass with a smaller cutter (.125 possibly) second file. a third file cutout and release.

Now, this where the stepover will need adjusted accordingly. If done correctly you should barely no sanding if any.

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Hi Johnathan,

This is correct - the roughing pass was done with 1/8" downcut sipral bit, then detail pass was done with a 60 degree v-Bit.

thanks

James

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Hi Ken - got it! I’m going to take a more detailed look at the stepover settings. I also need to buy some scrap!

Your work looks beautiful - I’m hoping to get there in time. The learning curve is a wonderous thing!

James

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No scrap? try some foam insulation board like pink or the yellow stuff. make sure you use vac suc-it boot

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Sounds like a good idea - I was running out of wood that I was wanting to sacrifice! Thanks

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