Deep mitre with 90 degree v-bit

[Fuzzeh (Fuh Zeh)]

Can someone run through the process of creating a deep V groove with out getting squared off sides when using a bit like the #301 90 degree v bit - I know I’m missing somthing and it’s probably obvious but I’m having a problem visualising a solution.

Essentially I want to create a mitre in a thick piece, thicker than the depth of the edge on the cutter before it gets to the straight edges, if that makes sense…

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

Start with a suitably thick piece of stock:

Draw the geometry you want:

(Note that it projects at the top and bottom by greater than tool radius at each end)

Draw the cut in profile:

(Note that you will need to ensure that the tool has an adequate cutting flute length — a “Long Reach Endmill”)

Draw a pair of lines centered on the tool outline:

and align them with the stock:

and draw a rectangle for the central channel:

Then assign toolpaths:

Large rectangle

Inner rectangle

Lines

Attached as a v8 file:

chamfer_channel.c2d (52 KB)

If you need to cut an angle longer than the length of the cutting flutes you will need additional lines — draw/position them in the profile and assign cuts to a suitable depth.

EDIT: To finish this and answer the actual question:

Draw the balance of the cut in profile:

Since things fit perfectly, it is probably best to add one more:

and draw in a box twice as large as necessary:

Then draw in lines:

and align them:

Then measure for each:

and assign a toolpath:

and repeat for the balance:

v8 version:

miter_v8.c2d (64 KB)

[Fuzzeh (Fuh Zeh)]

Thanks for the response, so essentially I need to do a series of cut->move right->stepdown->cuts and then do the same from the other direction.

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

Something like that.

The big thing is, you can draw the cut in profile to get dimensions (or do the trigonometry):

2D Drawing | Design into 3D

[Tod1d (Tod (with 1 'd'))]

Is this what you’re looking for? (3/4" stock)

Lie like hell!!! Create a 90° Vee that’s at least 1 1/2" diameter, then do a series of V-carves (without clearing) at your desired cut depths. (I went 0.25, 0.50, 0.75)

Then load your 1/2" 90° Vee & let 'er rip.

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

OIC, see:

Full blind box joints in Carbide Create

Next, determine what the minimum number of passes necessary would be: [image] One option would be to have a different number of passes on each side. Draw in a suitable line for one cut and use Linear Array to duplicate it as many times as needed, w/ extras for origin and end points: [image] If need be, adjust the width of things to line up w/ stock thickness. Then, measure the distance: [image] and assign toolpaths working down to the necessary depths: [image]

[Fuzzeh (Fuh Zeh)]

Oh wow yes, that seems perfect. Thank you.