Help!! Rotary Profiling

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doublem
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Help!! Rotary Profiling

Post by doublem »

legs.crv3d
(459 KiB) Downloaded 103 times
Profile 12.txt
(1.32 KiB) Downloaded 95 times
I have a perplexing probolem.
I have created and machined a component. Its four sofa legs for my son.
I wanted to profile a cutoff grove to aid me in separating them.
When I ran the profile that went around the y axis, the cutter dived into Zero yikes.
I checked the Gcode and you can see it there.
After wondering what had done wrong, I tried a profile running up the Y axis and it worked fine.
Can anyone suggest where I have gone wrong?
I have attached the gcode as well as the componet file.
Cheers
Mike

bravesoul
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Re: Help!! Rotary Profiling

Post by bravesoul »

If I am reading your file legs.crv3d correctly, your start cut is 0 with a cut depth of 5mm. I haven't done any rotary recently but that just doesn't look right.
Joe

garylmast
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Re: Help!! Rotary Profiling

Post by garylmast »

I had one similar I did a few days ago, but instead of a profile cut, I did a pocket. I have three legs that I attached with a tenon, and all three cuts came out fine. Where I needed to do the cutoff, I added a section to each end.

Gary
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garylmast
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Re: Help!! Rotary Profiling

Post by garylmast »

If I am reading your file legs.crv3d correctly, your start cut is 0 with a cut depth of 5mm. I haven't done any rotary recently but that just doesn't look right.
Joe


My pocket toolpath started a zero with at cut depth of 3/8". Like I mentioned it worked fine.

Gary
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dealguy11
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Re: Help!! Rotary Profiling

Post by dealguy11 »

Your profile went beyond the edge of the component defining the shape. Look on the left side of the component in the 2d view. The vector goes beyond the component. Since the vector is set up to project onto the 3d model, and there is no model, it plunges to zero.

There's several ways to deal with this, but the easiest is to just adjust the vector so that it doesn't fall off the edge of the model.

If I were you I'd also increase the width of the component so that it fills the entire area of the job size. After the model is wrapped you're showing a little gap in the preview, which probably leaves some kind of artifact on the actual part.
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SteveNelson46
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Re: Help!! Rotary Profiling

Post by SteveNelson46 »

Just use a deeper cut depth for the separators to compensate for the material already removed by the 3D roughing and finishing toolpaths. Maybe 20mm? Also, uncheck "Project toolpath onto 3D model". You might also want to check your feed rate. 1200 IPM is pretty fast for that small of a bit. I would use about 60 to 100 IPM
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legs-2.crv3d
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Steve

doublem
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Re: Help!! Rotary Profiling

Post by doublem »

Thanks everyone for your suggestions. Great to get the help.
Dealguy is spot on. I reduced thr length of the lines to the compoment and the zero plunge went away.
I am a bit puzzled though because I thought you mak a line greater than the model to eliminate a seam.
Just have to be carefull in future. Got a fright when the router buried itself in the project.
As to my feed rates I always get lazy and reset the rates :lol: at the machine to get the optimum rates.
Thanks once again. Great forum

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SteveNelson46
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Re: Help!! Rotary Profiling

Post by SteveNelson46 »

Has anyone opened the example posted by the OP in post #1 in version 10? When I try to resize the top line that extends past the project edge using the mouse the line jumps off the screen to the left. Everything seems to be okay in ver 9.5.
Steve

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dealguy11
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Re: Help!! Rotary Profiling

Post by dealguy11 »

The "make a line longer than the model to avoid a seam" only works if you're not using the "project onto the 3d model" option. A simple 2d toolpath, set to cut to a specific depth, will not be affected by the 3d model underneath it.
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pviljoen
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Re: Help!! Rotary Profiling

Post by pviljoen »

I see in the example that the you are cutting x2A. I tried that in my problem and it did not work as I was cutting Y2A.
Both the rough cut and the finish cut seems to drop off into zero point.
This is not constant for me. I have some previous projects that cut perfectly.

I have tried attaching the .crv3d file but it is to large. I would appreciate any advice.
I have added a jpeg of the screen.
pillar-24.png

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Rcnewcomb
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Re: Help!! Rotary Profiling

Post by Rcnewcomb »

If the file is too large to upload here you can use a file sharing site such as drive.google.com, onedrive.com, or dropbox.com. They all have free accounts available
  • Upload the file to the file sharing site
  • Make the link shareable
  • Share the link to the file here
- Randall Newcomb
10 fingers in, 10 fingers out, another good day in the shop

pviljoen
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Re: Help!! Rotary Profiling

Post by pviljoen »

I solved the problem by using a method I use on the smaller machines.
1. Create an outline for the 2-d image.(vector Boundary)
2. Size the vector to be slightly larger that the 2D image( see image attached.
3. Using "selected vector" to create you toolpath.

The question now is why you should use a hack to create the object correctly?
cutoff prevent.png

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