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Bore Operation

Anonymous

Bore Operation

Anonymous
Not applicable
Hi Fusion 360 CAM Community!
I'm new to these forums so I apologise if I've posted this question in the wrong manner.

I know Fusion 360 is a very reliable program so I'm positive this is something I'm doing wrong. I recently built an Openbuilds cbeam based router. I'm using Fusion for CAD / CAM and bCNC for sending. My first real project is my router's sub-plate. It's a large piece of .5" cast aluminum that spans the entire length of my machine. I'm really only adding a bunch of strategically placed holes for attachment of waste board material and some t-track. I designed the plate in fusion and I'm working on it in sections with each section utilizing the same origin. I'm using the Bore option in fusion. All the holes I'm boring are to be 4mm in the end and I'm using a 3.175mm 2 flute end mill. I scribed my origin on the piece of cast plate before running the first bore operation and cycled .y machine a few times to make sure the position was repeatable. (Zero G54 WPOS on scribe mark, home machine then send machine to WPOS G54 zero and it was very repeatable). So I ran my first bore operation on the front half of the plate. I will have to remove the plate and flip it around and run basically a mirrored operation because the router can't reach the back part. Anyway, my zero is located at the center of one of the bore holes in the middle of the plate. After running the first bore operation, I sent the machine to return to WPOS zero and I noticed the end mill wasn't centered in the hole. It was off to one side by about .5mm. The only settings I changed were my cutting feed rate and pitch. I lowered the pitch because 1mm was too aggressive. I'm just wondering why my zero is off after running the operation. Is there a setting I should be looking at? I'm really sorry if this is a silly question. I'm really just trying to eliminate as many variables as possible before I tear the machine apart to inspect the and backlash nuts.
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Anonymous
Not applicable
I also want to say that the hole diameter are spot on, exactly 4mm. I'm using cheap end mills also.
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GeorgeRoberts
Autodesk
Autodesk

Hello,

 

Thanks for posting! It's good to get such a detailed explanation of your problem. Please could you share the code that you used for this bore operation? Have you checked that the active work origin is correct? Your work origin may have been switched to the machine default so it can return to its home position, then never switched back to the origin you have set.

 

The next thing to check is seeing if your machine is losing steps.. Some machines have a check when homing the axes (return to limit sensors) to show you the difference in position from the previous time the axes were homed, this would tell you if the machine is gradually losing steps whilst cutting. I would guess it's not this, as you would probably see the effect inside the bore operation.

 

 

Hope this helps

 

-

George Roberts

Manufacturing Product manager
If you'd like to provide feedback and discuss how you would like things to be in the future, Email Me and we can arrange a virtual meeting!
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Anonymous
Not applicable
Hey thanks so much for your help & interest. All of this CNC and CAM is a new thing for me. I'm constantly learning more every day and it's awesome. I'm actually still learning how to properly use the G** workspaces. When I start up my machine the G54 workspace is active so this is what I've been working with up to now. I know all my issues are operator error so anything you share with me is considered valuable advise.

I think I can cancel out end stop error because I was able to repeatably locate the G54 zero location prior to running the job.

I'm not sure about the lost steps. I'm really just starting to learn the limits of my machine so I've been taking it slow. My cutting feed rate was really low plus the low pitch setting.

Is setting my job origin as the center of one of the bore locations the wrong thing to do? I couldn't use a corner of the plate because the spindle can't reach them. Some of my workflow is sort of just what I've found to work through experiment. I'm sure I'm not doing things 100% proper.

I'm at work right now but I will share the code with you when I get home. Again, thank you for support and I'm completely open to criticism. The thing I'm striving for the most at this point is repeatability. I want to be able to shut my machine down and continue exactly where I left off the next time I start up. I can dial in my feeds and speeds later.
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Anonymous
Not applicable
I realize that some of this is beyond the realm of software. Mainly, since I'm new to CAM, I was wondering if there were any specific settings I should be paying more attention to. As it is I still don't understand everything I see in the menus.
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Anonymous
Not applicable
Hey I want to say thank you for your help. I've spent some time messing around with the machine this weekend and I think I can say I was having a mechanical issue. I haven't completely nailed it down but after running a couple tests, I'm fairly confident the gcode was solid. There's so many variables with these home built machines and so it was probably silly to jump on the forum here so fast. One thing is for certain, my machine can't handle the speeds and feeds generated by fusion. I also want to say I tried a couple other CAD / CAM solutions and so far I'm really impressed with fusion. Keep up the amazing work!
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523Industries
Advocate
Advocate

@Anonymous wrote:
One thing is for certain, my machine can't handle the speeds and feeds generated by fusion. I also want to say I tried a couple other CAD / CAM solutions and so far I'm really impressed with fusion. Keep up the amazing work!

 

The speeds and feeds are fully adjustable, what your machine might be having problems with is the amount of code generated by an operation and being able to process is appropriately.

 

This can also be adjusted to a point with changes to the Tolerance, using Smoothing, adjusting the Lead-In and Lead-Out, etc.  If you expand an operation you'll see the size of the code that'll be generated, and you can see what changes to the parameters (and others) do to the size of that code.

Nick Santiago
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Anonymous
Not applicable
Hey Nick!
Thanks for your interest. Yeah my machine uses basically an Arduino uno based controller running grbl. I've seen the settings you mention but haven't messed with them much. When you say expand the operation, is this something I accomplish under the whatever operation tab I'm setting up ie. Bore / Contour?
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523Industries
Advocate
Advocate

Sorry, it's in the Browser under your Setup below WCS.

 

 

Screen Shot 2017-11-19 at 1.13.16 PM.png

 

 

 

Nick Santiago
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