Fusion 360 - V Pocket CAM Milling - Ask LarsLive

V Pocket CAM Milling is a snippet of Sunday's Ask LarsLive. You Can watch the full episode here:
• Ask LarsLive Fusion 36...
(The advice in my videos are my own and are not intended to represent the views of my wife, children or employer)
My email:
[e-mail]
Want to learn more about Fusion 360? Check out this link:
autode.sk/2rXApL2
Free CNC Handbook:
www.larschristensen.org/free-...
LET'S CONNECT:
/ lars_cadcam
/ mrlarschristensen
/ cadcamstuff
MY SITE:
www.larschristensen.org/

[@dustinwalden7091]

I would just rough it out with a 3D adaptive with an endmill then finish with the 3D contour and chamfer mill. I actually have a part like this coming up so this helped a bunch. Thanks!

[@timthetoolman11460]

Awesome Lars, any cam info is much appreciated

[@gracjanlada4622]

Great idea. Thanks Lars. 👌

[@mechonmaster6953]

Your great sir

[@concept303]

This reminds me, could this strategy also be used for cutting an internal dovetail with a dovetail cutter? When I’ve cut dovetails before you have the issue of the volume of material removal getting increasing greater with each cut. One solution I’d heard of was attempting to ‘walk’ the tool path down the slope of the dovetail, rather than just increasing radially, but I couldn’t get a Fusion to do it.

[@koplandavid]

keep em coming

[@feenixb1o7]

Hi Lars, could you tell me how to do a similar operation but ending with a pocket that has a "Flat" bottom. I wish to engrave a shape with the chamfered edges, but with a flat bottomed pocket.

[@mostafaelkady192]

Hello Lars, I'd like to use my engraving V bit to do a 3d pocket since i want the draft (slanted walls) and also take advantage of the very small (0.2mm) tip. I've set it up as a tapered mill and the toolpath is exactly what I need but I keep getting errors in the simulation for "fake" colliisions which freezes the stock till the end of the simulaiton. If I change my tool to a chamfer mill instead, the exact opposite happens, the simulation doesn't give any errors despite the fact that the toolpath is wrong and there's visible gouging. This problem only happens with certain models and I haven't found the proper formula to replicate it but it happens when I'm doing a rest machine on a 3D pocket. Trying to get the exact geometry I want in CAD/Modelling might solve the problem but I can't seem to find a way to do it. There's no way to do a draft angle on a 3d surface. (example, say I''ve extruded a square 1mm above a sphere and would like the draft the sides of the square).

[@mechonmaster6953]

Can you please give tutorial on Creo

[@EUnit111986]

If it is a 90° V pocket and you have a 5 axis or even a 4th axis machine available. Use that to your advantage and use a regular end mill with part tilted @ 45. Otherwise, use a sine plate to set your part up at a 45 if it is not too big to do so.

[@mpmachining7227]

Love the videos Lars! I have a question unrelated to this example and I was hoping you could point me in the right direction. I am unable to create toolpaths with an RPM if 0. When I try to set my feeds and speeds in the tool librart to 0 RPM, it turns the text red and wont let me proceed due to the calculated feed per tooth being undefined. I have edited my post processor so it will accept a 0 RPM but in an update recently I lost the ability to post toolpaths with 0 RPM or even generate the toolpath. Thanks Lars!

[@cadcamstuff]

I am not sure you can. Why do you want 0 rpm?

[@mpmachining7227]

@@cadcamstuff I have a diamond drag engraving tool that runs at 0 RPM. I have been just manually editing the NC when I was done but I would prefer if I could do it right from Fusion

[@robevans8555]

Liked as always, but this seems like a work around rather than a clean solution?

[@natecontarino1748]

Great choreography in the thumbnail.

[@cadcamstuff]

Thank you 😁

[@mehranabolghasemi725]

If I want to mill down a groove-like channel (i.e. a channel with gradually changing its depth) this is the way of doing it? What about using 3D parallel tool path?

[@cadcamstuff]

Sure, you can do that

[@mehranabolghasemi725]

@@cadcamstuff Thanks for the response. Which method is better?

[@leebaldwin677]

How would you mill a large 20mm counter sink for a screw and what milling statatgy would you advice. Thank you

[@cadcamstuff]

Hi Lee, I would use a ball endmill and the 3D Contour toolpath. Hope this is useful. Lars

[@leebaldwin677]

@@cadcamstuff thank you ill give a try,

[@BlaiseBarrette]

Maybe remove most of the material with an flat end mill or bull n’ose end mill in a 3D adaptive clearing and finish with the chamfer mill.

[@huistv2005]

Hi Lars, your are being creative and that’s cool, but I think the fusion team has to look into this thing and come up with a better solution. For instance a multiple depth or roughing option on various paths. Not only this one. Not being able to use a v-bit tool anywhere is also a pitty. There are work arounds, I know, but talk to them and tickle them a bit. Let’s make Fusion360 even better! Thanks.

[@Luke_guy]

for everyone watching in 2022.. They removed chamfer from 3d contour. another solution I found for this is... "You can use a taper cutter instead of a chamfer mill. At times I've had to have a taper mill and a chamfer mill with the same tool number so I can use 3d pocket then engrave to finish which seems crazy!"

[@mostafaelkady192]

I came to this video because I do use a tapered mill and it's been working well, but I have a problem where I sometimes I get errors in stock calculations that seem fake, and they ruin the remainder of the simulation which is pretty infuriating. Any tips on how to deal with that ?

[@kiltedcraftworks4609]

I'll add that I had errors and crashes with a ballend taper mill, but a bullnose with 0.001" diameter and edge radius was ok.

[@markrichardson239]

Well, can't we go in with a square or ball nose just to rid the excess stock? This is the way we do it in the real world.