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Fusion 360 generates dumb toolpath when I use rest machining for a lathe

Anonymous

Fusion 360 generates dumb toolpath when I use rest machining for a lathe

Anonymous
Not applicable

Recently I have been trying the rest machining function for a lathe but sadly it doesn't appear that i know how to use it.

I wanted to do the finishing pass with a different tool then the roughing so I put stock to leave and when I turned on rest machining it made a weird toolpath that for some reason went from left to right. This isn't a problem for the lathe or the tool but it takes much longer compared to it going the right way. It would also sometimes hit already finished surfaces and potentially break the tool.

 

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johnswetz1982
Advisor
Advisor

Can you attach your file so we can see your setup and operation settings?

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Anonymous
Not applicable

Here you go

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Anonymous
Not applicable

Here you go

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Anonymous
Not applicable

Thank you for replying to my post and i hope you find the reason why it does what it does right now.

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seth.madore
Community Manager
Community Manager

So i'm still finding my bearings with Turning (I don't have a lathe in my shop), so this may not be the OPTIMUM solutions, and I'm certainly open to seeing other methods of accomplishing this task.

 

In the Mill environment of Fusion, I often ask "can I do this in one toolpath". And the answer is often "yes". But (and there's always a but) can it also be done a lot quicker and easier by breaking it up into a couple extra toolpaths? And the answer is almost always a resounding "yes". So, I'm going to do the same with Turning. I duplicated your toolpath and then just applied a few different parameters to it. Give it a look and see what you think of the path. Personally speaking, I'm not too keen on it bouncing between front and back and back and forth. I'll play with it some more to see if I can resolve that. It seems to me the toolpath needs an "order by area" option like Adaptive has

 

screenshot_66.png

 

File is attached.


Seth Madore
Customer Advocacy Manager - Manufacturing
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Anonymous
Not applicable

Yes i know but the thing is that i dont have a neutral angle holder I just have a regular solderd type.I'm trying to spare it by using right side tool becaus I have a holder and bunch of inserts for it

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seth.madore
Community Manager
Community Manager

@Anonymous wrote:

Yes i know but the thing is that i don't have a neutral angle holder I just have a regular soldered type.I'm trying to spare it by using a right side tool because I have a holder and bunch of inserts for it


That was not stated in your original query. Your file only contained two tools. 

What is your actual tool you want to finish with? Geometry matters a great deal. If it's not able to reach all areas, you really can't trick Fusion into going there...


Seth Madore
Customer Advocacy Manager - Manufacturing
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Anonymous
Not applicable

My idea was to finish most of the work with the right side tool and to leave like 0.7mm for one regular pass and one finishing pass with my neutral angle tool.This does work, but the problem is that the tool moves from left to right instead of the other way. Also sorry for not including the reason why i want to finish it with a 2nd tool at the time i didn't think it mattered.

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Anonymous
Not applicable

Also i forgot to say that i don't really mind that it doesn't follow the contour perfectly and the shape i get with the 55deg neutral tool is just fine

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zwelsh91
Advocate
Advocate

Please take a look at the attached file. I went through it and added some more realistic speeds and feeds (fairly conservative spindle speeds) and optimized the profile toolpaths. I know when I was learning sometimes seeing how someone does it was half the battle of learning. To me it would be best to do this part with one tool and not worry about roughing with a tool that does not fit into the contours very well.

 

Zak Welsh
Zakary Welsh Machine LLC
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Anonymous
Not applicable

Alright but why did you spit it into two parts why not just use the finishing pass option.Also the speeds are the same for both the ruffing and the finishing pass.

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zwelsh91
Advocate
Advocate

I was just trying to optimize the originally posted operations. In general, yes, using a finish pass would be a little bit cleaner in the way of number of toolpaths. I will sometimes use a second operation like the originally posted Rest Machining op so that if there are tight tolerance elements needing close attention, I can add an additional offset to the same tool for example: T0151 (Tool 1 with a tool offset of 51) to be able to adjust the tools offset for that operation only. Or even add a second tool or the same reasons, that way the second tool is only doing the finish work.

 

On the speed and feed end of things, like I stated before the speeds and feeds are fairly conservative. In general the only thing I usually change for finish passes is the feed rather than the speed. I have no manufacturers tooling information to go off of to determine what speeds and feeds are appropriate for the tool you are planning on using. I use the imperial system rather than metric on a regular basis. That being said for super general spindle speeds and feeds: 1018 CRS bar CSS 400-600 sfm .007-.012ipr roughing feed .03-.120 doc depending on the diameter and stick out. finishing .0035-.005 ipr same spindle speed. For aluminum 800-2200 sfm and the same feed. factors i left out are tool nose radius and chip breaker, they both will drive your steop-overs and feeds.

 

Speeds and feeds depend on many factors like: Material (work piece and tooling), axial stick out of the material, diameter of work piece. etc. not to mention the geometry and design og the cutting tool you are using for the job, the cutting tools geometry has just as much if not more effect on the speeds and feeds as the physical conditions of the workholding and work piece material.

Zak Welsh
Zakary Welsh Machine LLC
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