Another carved seat issue
Another carved seat issue
Hello all,
I finally started carving my seats, with some great help from rscrawford fixing the design issues.
The blank is 516 x 503 x 40 mm
I am only carving the seat and the nose on the CNC, the contour is done with regular woodworking tools. So I started the rough cut with a 0.25 straight uncut bit. So far so good. Then I changed to a 0.25 ball nose bit (https://www.amazon.com/gp/product/B0070 ... UTF8&psc=1) but the bit is too short. I thought it would be fine since I rough carved it, but the smoothing carve starts at a place when there's full height (see picture). It is trying to go full depth and the collet hits the top of the material. Any idea how I could fix this?
Thank you.
I finally started carving my seats, with some great help from rscrawford fixing the design issues.
The blank is 516 x 503 x 40 mm
I am only carving the seat and the nose on the CNC, the contour is done with regular woodworking tools. So I started the rough cut with a 0.25 straight uncut bit. So far so good. Then I changed to a 0.25 ball nose bit (https://www.amazon.com/gp/product/B0070 ... UTF8&psc=1) but the bit is too short. I thought it would be fine since I rough carved it, but the smoothing carve starts at a place when there's full height (see picture). It is trying to go full depth and the collet hits the top of the material. Any idea how I could fix this?
Thank you.
- martin54
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Re: Another carved seat issue
Can you run the roughing cut with the same ball nose bit your using for the finishing cut since both are 1/4" ? I do this sometimes just use a different stepover for both, saves me having to tool change plus I can send both toolpaths as one file & machine just gets on & does the job
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Re: Another carved seat issue
Martin,
I don't think it will change anything as the 2 tools have the same diameter. It's probably a machining allowance issue: the roughing tool can't simply reach the angle because there is not enough space for the diameter + allowance.
Can't be sure without the file.
sbouloc,
before cutting, analyse your toolpaths. Simply run a simulation (preview toolpath) and you will see this issue. You can then adjust your tooling or you design to avoid problems. Aspire simulation is very reliable and accurate.
I don't think it will change anything as the 2 tools have the same diameter. It's probably a machining allowance issue: the roughing tool can't simply reach the angle because there is not enough space for the diameter + allowance.
Can't be sure without the file.
sbouloc,
before cutting, analyse your toolpaths. Simply run a simulation (preview toolpath) and you will see this issue. You can then adjust your tooling or you design to avoid problems. Aspire simulation is very reliable and accurate.
Best regards
Didier
W7 - Aspire 8.517
Didier
W7 - Aspire 8.517
- rscrawford
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Re: Another carved seat issue
If I have a 3D area where it will plunge too deep (around the edges of my seat) I'll make a 'border model' that sticks out from the seat 1/2" and is just lower than the seat model where the two meet. This keeps the bit from plunging down off the edge of the seat model.
Russell Crawford
http://www.cherryleaf-rustle.com
http://www.cherryleaf-rustle.com
- mtylerfl
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Re: Another carved seat issue
+1 on that. Several of the Projects of the Month use that technique. I typically label those components as "Bit Stop" or "Bit Stop Plane"rscrawford wrote:If I have a 3D area where it will plunge too deep (around the edges of my seat) I'll make a 'border model' that sticks out from the seat 1/2" and is just lower than the seat model where the two meet. This keeps the bit from plunging down off the edge of the seat model.
Michael Tyler
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Re: Another carved seat issue
Can you share with us which projects they are Michael, not sure I fully understand Mr Crawfords explanation so would like to look into this a little further, hopefully all will become clear if I look at the project filesmtylerfl wrote:+1 on that. Several of the Projects of the Month use that technique. I typically label those components as "Bit Stop" or "Bit Stop Plane"rscrawford wrote:If I have a 3D area where it will plunge too deep (around the edges of my seat) I'll make a 'border model' that sticks out from the seat 1/2" and is just lower than the seat model where the two meet. This keeps the bit from plunging down off the edge of the seat model.
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Re: Another carved seat issue
Here's just a few recent projects off the top of my head that use merged planes as "stop planes"...martin54 wrote:Can you share with us which projects they are Michael, not sure I fully understand Mr Crawfords explanation so would like to look into this a little further, hopefully all will become clear if I look at the project filesmtylerfl wrote:+1 on that. Several of the Projects of the Month use that technique. I typically label those components as "Bit Stop" or "Bit Stop Plane"rscrawford wrote:If I have a 3D area where it will plunge too deep (around the edges of my seat) I'll make a 'border model' that sticks out from the seat 1/2" and is just lower than the seat model where the two meet. This keeps the bit from plunging down off the edge of the seat model.
• Yummy Cake Pedestal
• Weathered Slat Clock
• Faceplant Planter
• Seahorse Corbels (I merged and baked the bit stop planes and individual components for public release - you can view it in the 3D preview, but not as separate components)
Michael Tyler
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Re: Another carved seat issue
Thanks for the feedback rscrawford. Sorry for the dumb question , but how do you achieve that? Zero plane?rscrawford wrote:If I have a 3D area where it will plunge too deep (around the edges of my seat) I'll make a 'border model' that sticks out from the seat 1/2" and is just lower than the seat model where the two meet. This keeps the bit from plunging down off the edge of the seat model.
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Re: Another carved seat issue
Discard this, I completely misread your posts.LittleGreyMan wrote:Martin,
I don't think it will change anything as the 2 tools have the same diameter. It's probably a machining allowance issue: the roughing tool can't simply reach the angle because there is not enough space for the diameter + allowance.
Can't be sure without the file.
sbouloc,
before cutting, analyse your toolpaths. Simply run a simulation (preview toolpath) and you will see this issue. You can then adjust your tooling or you design to avoid problems. Aspire simulation is very reliable and accurate.
Best regards
Didier
W7 - Aspire 8.517
Didier
W7 - Aspire 8.517
- martin54
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Re: Another carved seat issue
Thanks Michael, will have a look at those when I can find a bit of spare time
- mtylerfl
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Re: Another carved seat issue
I think in some of the video tutorials the term "Limit Plane" is used. Same idea..."limits" or "stops" bit travel when and where required.
Yes, you can start with a Zero Plane and add thickness for some situations. Or, create an Offset vector and create your own custom shaped plane that extends beyond a model, as mentioned earlier.
Yes, you can start with a Zero Plane and add thickness for some situations. Or, create an Offset vector and create your own custom shaped plane that extends beyond a model, as mentioned earlier.
Michael Tyler
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Re: Another carved seat issue
I'll look and see if I still have your file and I can add a plane.sbouloc wrote:Thanks for the feedback rscrawford. Sorry for the dumb question , but how do you achieve that? Zero plane?rscrawford wrote:If I have a 3D area where it will plunge too deep (around the edges of my seat) I'll make a 'border model' that sticks out from the seat 1/2" and is just lower than the seat model where the two meet. This keeps the bit from plunging down off the edge of the seat model.
Basically, I follow the contour of the edge of the model, and just make another model 1/4" lower that sticks out from the original model (overlap the models and 'merge' them). It just gives something to stop the bit from plunging all the way down to the spoil board if it goes off the edge of the model (which is often possible with these 'pixelated' type models that Aspire uses - they are superior in many ways to NERBS based models, but inferior in other ways, particularly at the edge of your models).
Russell Crawford
http://www.cherryleaf-rustle.com
http://www.cherryleaf-rustle.com
Re: Another carved seat issue
Now I remember you put a zero plane on some previous carved seat you shared on the forum. I didn’t understand why you did that at that time. Thank you for helping me out again.