Oblong holes cut.....Again!

[kdan (Kenneth)]

I did a search on this but turned up nothing…Maybe I didn’t put the appropriate search phrase……But I know I have read about this somewhere about this on this forum.

Today I was routing out a small project:

And noticed the (4) .2110 through holes were cut oblong. I was using a .125 compression bit to cut these.

I set out to check for the obvious causes and only found the Z-Axis plate (not the aluminum router mount itself) had side to side play (not much at all).

I went back over the assembly instructions that came with my machine and found no mention of tightening the eccentric nuts on the V-Wheels (if that is what they are) at any time, and that’s where the movement seems to be between wheels and rail on the XZ-Axis plate.

Is there a way to tighten these or should it have a little play against the V-Rails?

Another thought, could the plunge rate cause oblong holes if to aggressive? And maybe this bit is a tad bit to large?

Here was my set-up:

And the results:

[WillAdams (William Adams (Carbide 3D))]

Please see:

https://wiki.shapeoko.com/index.php/FAQ#Mechanical

and refer to:

https://wiki.shapeoko.com/index.php/FAQ#Troubleshooting_Concepts

[kdan (Kenneth)]

Thanks Will for the links…But I don’t see the answer to my problem.
If these nuts on the v-wheels are eccentric nuts for the life of me I can’t see a way to tighten them. I have checked all other parts of the machine and only found play mentioned above.

I just bought this machine in December-19
Am I missing something here?

[WillAdams (William Adams (Carbide 3D))]

The bottom V wheels on each plate are on eccentric nuts which serve a dual-purpose:

• hold them with a wrench while you tighten the bolt with an Allen wrench
• Turn the entire assembly in unison using both the wrench (8 or 10mm) and Allen wrench.

Please see: https://docs.carbide3d.com/support/tensioning-eccentrics/

[kdan (Kenneth)]

I guess I was not clear, I know how to adjust the nuts but I just could not see the room to do so:

I’ll go back and look, maybe I have to remove this plate, adjust a little and reinstall and see if that was enough.

Thanks Will

[WillAdams (William Adams (Carbide 3D))]

There are access holes for them in the back plate.

[kdan (Kenneth)]

I went back out to the shop and after “opening my eyes” I was looking at something else from the picture! The nuts are in full access from the front of the plate. I tighten them and all seems well now!

@WillAdams Sorry will for not investigating it thoroughly before posting!