Create that Taper

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BernieNUFC
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Create that Taper

Post by BernieNUFC »

Hi
I have looked through some old posts but cannot seem to find an answer for my query.
I have a 19mm thick piece of 300mm square wood in which i need to sit the component in the picture into.

I have made a drawing and toolpathed a pocket for 'A' in the picture, i have also done similar for 'B', but want i want to achieve is the taper from the bottom of A to the top of B, is this possible in Vcarve?
taper.jpg
Many thanks
Bernie
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dealguy11
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Re: Create that Taper

Post by dealguy11 »

Several ways to do it. The easiest is probably to use a Moulding toolpath. Use the inner circle as the rail and create a sweep vector with the appropriate angle.
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dealguy11
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Re: Create that Taper

Post by dealguy11 »

Just thought of another thing on this...if you use the moulding toolpath, you need to make the angled shape shorter than the actual radius of the angled area by the radius of the ball nose bit you're using. Since the moulding toolpath uses the center of the bit to determine where to start and stop, it will increase the size of the upper pocket by the radius of the bit if you don't do this. Unfortunately, this also means there will be a small flat at the top of the angle - see picture. If you set the toolpath at the appropriate depth in the material this shouldn't be a problem for an insert.
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funnel hole.JPG
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BernieNUFC
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Re: Create that Taper

Post by BernieNUFC »

Many thanks Steve thats a great help, i have never used the moulding path so tutorial time :D

Cheers
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4DThinker
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Re: Create that Taper

Post by 4DThinker »

You can also create tapered holes using the fluting toolpath and a flat bottomed end mill. They take longer to cut, but don't have the same nagging problem the Moulding toolpath has using a ball nosed bit. Example attached.
Tapered hole Fluting.jpg
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tapered hole fluting.crv
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BernieNUFC
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Re: Create that Taper

Post by BernieNUFC »

Wow thanks 4dthinker that's mint, i still have a lot to learn :D

Cheers
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BernieNUFC
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Re: Create that Taper

Post by BernieNUFC »

Ok so head down and here we go...... :(
No matter what i do i cannot get my taper the same direction as 4dthinker, mine goes the other way :?:
I have varied the start and finish depths, i have had them both different smaller first and then smaller last and both the same but i cannot get it deeper near the centre, anything simple i am missing? cheers
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BernieNUFC
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Re: Create that Taper

Post by BernieNUFC »

Damm when i thought about it i sensed it may have been how i drew the first line and it was, so ignore my previous please.... :)
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4DThinker
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Re: Create that Taper

Post by 4DThinker »

Just in case, for anyone who doesn't understand:

I start with a 2D vector that starts from the high side of the tapered pocket and ends at the low side. I then offset it toward the inside by 1/2 the diameter of the end mill bit I intend to use.

Next step is to make a circular array of that line using the center of the circle. 360 degrees, and the number of lines used will vary by the size of the circle and bit used. I try to use many lines so that when they cut they only are 1/4" the diameter of the bit at the outside edge away from each other. Closer (more lines) together for a smoother finish.

This technique comes in very handy for any sloped surface, planar or circular, steep or shallow. A tip that will speed up this kind of cut is to set the pass depth to equal the finish cut depth, and crank up the plunge speed.

4D

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Re: Create that Taper

Post by FixitMike »

I have found that when the fluting toolpath is used to make a sloped surface, you get the smoothest results with an end mill. A ball end cutter leaves a rippled surface.
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BernieNUFC
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Re: Create that Taper

Post by BernieNUFC »

Thanks gents and it works great, i found it strange though that a straight mill would be better better than a ball mill but if you think about it it makes sense
another job learnt :-)
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