One Sided Chamfer

[jdonaldson]

Embarrassed to ask because i'm sure it's right in front of me
but how do you cut a 12" X 5.5" x 1" board with 30deg Chamfere's
on both short end's.

also i need to cut a chamfer, basically taking one corner off of a
20"long by 1" square

Thanks

John

[SteveNelson46]

A seperate vector for the chamfer(s) is needed. I would suggest placing them on a separate layer. A chamfer toolpath could be used but I would just use a profile toolpath with a v-bit set to cut on the line.

[adze_cnc]

Steve: I expect the drawing is an end-grain view of a 1x1 that is 20 inches long.

To the original poster. For both of your desires you're going to probably use an open vector along the edge(s) you want chamfered. Then you will use either the chamfer toolpath (if it supports using an open vector as an edge) or you will use the moulding toolpath using the open vector(s) as rails and you will need to draw the profile you want.

Steven

[4DThinker]

If I understand the request correctly, you can chamfer any edge with any angle between 89 and 1 degree using the moulding toolpath. The file below shows the 30 degree vector used, and how it was measured to determine the offset for the needed guide lines.

For the 1x1 stick use the same trick. I used a 1/4" ball end bit but a smaller ball end bit might leave a smoother chamfered surface.
4D

30 degree end chamfers.crv3d

(49.5 KiB) Downloaded 17 times

[SteveNelson46]

Steve: I expect the drawing is an end-grain view of a 1x1 that is 20 inches long.

To the original poster. For both of your desires you're going to probably use an open vector along the edge(s) you want chamfered. Then you will use either the chamfer toolpath (if it supports using an open vector as an edge) or you will use the moulding toolpath using the open vector(s) as rails and you will need to draw the profile you want.

Steven

I think that is what I said! I don't think the board is 12" or 5.5" thick.

[adze_cnc]

There were two projects listed. Their dimensions (length x width x thickness) are:

1. 12" x 5.5" x 1"
2. 12" x 1" x 1"

4DThinker dealt with the 1st one.

I expect that the 2nd one is the one pictured in the originally posted image. Again, as an end-grain shot. A captioning of the original image would have helped so much.

[jdonaldson]

Thanks everyone for the quick responses, 4D your sample file
enabled me to quickly generate some files for one project. The
second one I would like to get the edges more crisp than the TBN
thinking maybe roughing with em then finishing with TBN ??? or
after seeing what I'm trying to do maybe another toolpath would be
better

John

SideRails_V1.1.crv3d

(32.5 KiB) Downloaded 18 times

[adze_cnc]

I'm not too sure why you are having the chamfer so much below the surface.

Check out the attached file. Note the 1/8" foot extension on the moulding profile in the square box above the material.

Steven

[4DThinker]

Example for the 1x1. Used the image provided and traced it to make the chamfer vector. Added a 1/8" radius hook. Moved the guide line over from the edge where is was easiest to draw the amount shown by the dimension measured. Rough pass result followed by the finish pass result. Again, use a smaller ball nosed bit with 10% or less stepover for a smoother surface. I used 1/4"d bits for both toolpaths.

1x1 with chamfer.crv3d

(58 KiB) Downloaded 17 times

4D

[jdonaldson]

Thanks Stephen and 4D for the quick and perfect resolution to my problem.

4D i don't really understand the purpose of the hook

John

[adze_cnc]

The moulding toolpath will stop when the centre of the bit is at the end of the moulding profile. With a ball-end cutter this leaves an artefact. The "hook", added leg, etc. just forces the centre of the cutter to go past the material to make sure the material is removed fully.

That artefact can be seen in your original file. See image (blue circle).
 

[jdonaldson]

Thanks ADZE for the explanation, makes perfect sence now