getting a ledge on a v-carve tool path

[hack613]

I'm carving this curved skateboard surface and the v-carve is doing two passes. There's a ledge between the two passes you can see in the picture I attached.

Is there a quick way I can run some sort of finishing pass to clean that off?

This isn't critical as this is to be filled with black epoxy. So it's underneath. I'm just curious if anybody knows what I did wrong.

I'm using a 60 degree 1/8" shank, two flute v-carve.

[TReischl]

Looks like your 60 degree bit is not really 60 degrees to me.

That is pretty common btw, especially with inexpensive bits.

[hack613]

That's what I thought (and was afraid of).

Or it could be that the it's not really 1/8 at the widest part of the flutes...

Oh well...

It did come from drillman1 who is a great supplier down in texas....

[scottp55]

Drillman1's .125" shank engraving bits are consistent .1245" shank and cutters, BUT his 30* standard flat AND the 60* std(both have grey depth rings), are swaged just before the flute grind.
Both measure .118" at the flutes with my digital calipers.
His SHARP 60* (Burgundy depth ring .006"flat) is the normal .1245"
Don't know if it explains that bad a waterline mark though.
Never seen it quite that pronounced.
You sure you didn't have the 45* chucked(orange depth ring)....I'VE done That before my eyeballs were calibrated
scott

[Rcnewcomb]

If your machine can handle bits with a 1/4" or 1/2" shank then a CMT 60 degree LaserPoint V-bit might be your best solution. It is a 1/2" diameter bit which means it can cut a trench 0.433" deep.

The 858.001.11 has the 1/4" shank and the 858.501.11 has the 1/2" shank.

[adze_cnc]

Here's where "v-carve" can be used to mean 3 things:

1. name of software (VCarve)
2. a specific toolpath within the software (V-Carve / Engraving)
3. a type of router bit (v-carve)

I would call #3 a "v-bit".

Is the toolpath you are using a "V-Carve / Engraving Toolpath"? This appears to me to be a "Pocket Toolpath".

[mtylerfl]

Yes. Here is a very good example of the benefit of seeing the actual Vectric file (complete with Toolpaths you used are left intact - no changes from when you ran the project).

Hard to detect from your photo...but it appears you may be using two different bits - a v-bit and an end mill. That’s fine if you are using VCarve/engraving Toolpath along with a Flat area clearance set up.

But, we don’t know. Perhaps you are setting up a VCarve and a separate Pocket Toolpath?

Please upload your original Vectric file. All should become clear, once we can see it.

NOTE: All too often when we ask to see the actual Vectric file, people will upload a PDF or their gcode file. Please don’t do that - we need to see the actual .crv file! If it’s too large to upload here directly, then use a free DropBox account to upload your file, then post the link to that file here.

[adze_cnc]

My suspection that this is not a V-Carve/Engrave Toolpath is the rounded corners of the letters. For that matter a part of me really thinks this is a 3D Finish Toolpath and what we are seeing is an artefact of a gross step-over as the original poster mentioned a curved board.

Steven

[scottp55]

Also, after entering correct (calipered) size, and still getting Waterlines...
Perhaps run Paul Zank's bit angle test shape?

12.1.14 VBIT ANGLE TEST.crv

(511.5 KiB) Downloaded 69 times

Here's one where Drillman1's 90 left major waterlines with the angle entered AS 90*

Then ran those test shapes(also tweaking feeds/speeds on a new bit) and entered different angles to find least waterlines and best cut.

And then ran that angle (87*)after changing in Tool Database,on the same exact sign, and all that was left was the worst of the first cuts waterlines, which Easily sanded out.

Just an option to tweak...maybe try 56* first?
scott

Waterlines= reduce angle
Indented/overcut corners= increase angle

[mtylerfl]

My suspection that this is not a V-Carve/Engrave Toolpath is the rounded corners of the letters. For that matter a part of me really thinks this is a 3D Finish Toolpath and what we are seeing is an artefact of a gross step-over as the original poster mentioned a curved board.

Steven

That's why we need to see the file to solve any "mysteries".