Cutting a pocket with an oval bottom.
Cutting a pocket with an oval bottom.
I wish to cut a hole a foot in diameter. The hole needs to be three inches deep with a nice oval bottom. I see how to create the hole but the sides are straight down. Is there any way to easily create such an oval hole with a bull nose bit.
1. Currently the only way I can see this could be accomplished is to start cutting a small amount.
2. Slightly decrease the diameter of the hole and cut slightly deeper.
3. Repeat step 2 until I reach the required diameter and depth.
Of course the problem with this is that I would have may ridges (size of ridges would depend on how deep I made each cut) all the way down into the oval that I would need to smooth out.
Any thoughts on how I could cut such a hold would be greatly appreciated!!!
1. Currently the only way I can see this could be accomplished is to start cutting a small amount.
2. Slightly decrease the diameter of the hole and cut slightly deeper.
3. Repeat step 2 until I reach the required diameter and depth.
Of course the problem with this is that I would have may ridges (size of ridges would depend on how deep I made each cut) all the way down into the oval that I would need to smooth out.
Any thoughts on how I could cut such a hold would be greatly appreciated!!!
- dighsx
- Vectric Wizard
- Posts: 939
- Joined: Tue Nov 01, 2005 12:36 am
- Location: Royal Oak, Michigan USA
- Contact:
Let me make sure I understand what you're trying to make. You want to make a 1 foot dia circle that has a bottom that is like a bowl and not flat? Or do you want to make an oval 1 foot across that has a bowled or rounded bottom?
Take it easy.
Jay (www.cncjay.com)
Jay (www.cncjay.com)
- Paco
- Vectric Wizard
- Posts: 480
- Joined: Fri Sep 16, 2005 6:30 pm
- Location: Valcourt, Québec, Canada
- Contact:
Depending on the rest of the work involved, my way would be Rhino route design (for the cavity at least) and CAM it in other software. If you need more than just 3D toolpath done, say some 2D profiling around, you may just register both CAD part of the same design in both Rhino/other software and VCP and create and run toolpath coming from both programs. Yes, you need something like other software (3D CAM) to toolpath the oval cavity you're looking for... until VCP handle 3D format file like say STL, 3DS, DXF (3D) and such. You may provide your drawing to a fellow CNC friend that can create you the 3D toolpath too. Again, just make sure both drawings (of the same) are register EXACTLY the same from the origin and it'll just be like if all toolpath would have been create in a single package. Use a 3D preview if you can to see if all toolpath align.
About 3D CAM, when VCP allow 3D format file it'll be just so GREAT... but until my heart fell for other software after some testing, the support I got from Robert (Author) and it's price tag. Robert made some very interesting announcement on the user forum some days ago... There are some other 3D CAM out there but at the entry level, no one meat the flexibility of other software for the price tag. For more options and features, one will have to reach the 1000$ which is not really what you might looking for for basic and not so frequent 3D needs. other software have a 60 DAYS trial and Rhino have some kind of very flexible trial system too. Plan on some time ahead to get used to Rhino since 3D CAD is an whole different game...
Let us know how it goes.
I can't help myself at dreaming of a 3D CAD/CAM package from Vectric...
About 3D CAM, when VCP allow 3D format file it'll be just so GREAT... but until my heart fell for other software after some testing, the support I got from Robert (Author) and it's price tag. Robert made some very interesting announcement on the user forum some days ago... There are some other 3D CAM out there but at the entry level, no one meat the flexibility of other software for the price tag. For more options and features, one will have to reach the 1000$ which is not really what you might looking for for basic and not so frequent 3D needs. other software have a 60 DAYS trial and Rhino have some kind of very flexible trial system too. Plan on some time ahead to get used to Rhino since 3D CAD is an whole different game...
Let us know how it goes.
I can't help myself at dreaming of a 3D CAD/CAM package from Vectric...
-
- Vectric Craftsman
- Posts: 181
- Joined: Wed Nov 30, 2005 3:08 pm
- Model of CNC Machine: Router
- Location: Bordeaux, France
Hi Clay,
Jay said,
If so download the zip
Regards,
Warren.
Jay said,
If one of these options is correct, would either of these two be of any use?Let me make sure I understand what you're trying to make. You want to make a 1 foot dia circle that has a bottom that is like a bowl and not flat? Or do you want to make an oval 1 foot across that has a bowled or rounded bottom?
If so download the zip
Regards,
Warren.
- Attachments
-
- Dishes.zip
- (58.39 KiB) Downloaded 408 times
-
- Dish2.jpg
- (284.46 KiB) Downloaded 262 times
-
- Dish1.jpg
- (327.55 KiB) Downloaded 259 times
Warren.
Thank you very much for your drawing. Your oval is extremely close to what I need to do. Just larger. The first oval I need to do is 18 inches wide, 12 inches across and 5 inches deep. That oval needs to be almost in the center of a block of wood that is 48 inches wide, by 24 inches across and 6 inches deep.
See the attached crude drawing.
Did you do that design all with other software?
I have been trying but I can't get close to what you did. I can't make the botton oval.
I do need to accomplish the same thing myself.
Thank you all very much!!!! You have been a great help.
Thank you very much for your drawing. Your oval is extremely close to what I need to do. Just larger. The first oval I need to do is 18 inches wide, 12 inches across and 5 inches deep. That oval needs to be almost in the center of a block of wood that is 48 inches wide, by 24 inches across and 6 inches deep.
See the attached crude drawing.
Did you do that design all with other software?
I have been trying but I can't get close to what you did. I can't make the botton oval.
I do need to accomplish the same thing myself.
Thank you all very much!!!! You have been a great help.
- Attachments
-
- Oval.JPG
- (319.46 KiB) Downloaded 251 times
-
- Vectric Craftsman
- Posts: 181
- Joined: Wed Nov 30, 2005 3:08 pm
- Model of CNC Machine: Router
- Location: Bordeaux, France
Hi kc4ylx,
This is how I would draw the outside of the bowl, but if you wanted to cut it, you would require a 6" long form tool.
So I don't think I would bother.
Regards,
Warren.
This is how I would draw the outside of the bowl, but if you wanted to cut it, you would require a 6" long form tool.
So I don't think I would bother.
Regards,
Warren.
- Attachments
-
- Bowl.jpg
- (96.7 KiB) Downloaded 244 times
How does one draw that shape in V-Carve PRO? Looks great!
I agree, 6" tool is a long way to reach.
I am thinking about a lazy susan type of thing, but having compartments on top. None more than a inch deep. Then a recess in the bottom on the mechanical spinny thing.
Your bowl could be changed to make is not so steep and a shorter tool would be able to cut it.
I also am trying to make wooden boxes and didn't want to only have straight sides as all of mine to date have.
I would like a little taper to the bottom. Top is smaller than the bottom etc.
Rounder bottoms not 90* between the walls and the bottom.
Any and all help appreciated.
Ed
I agree, 6" tool is a long way to reach.
I am thinking about a lazy susan type of thing, but having compartments on top. None more than a inch deep. Then a recess in the bottom on the mechanical spinny thing.
Your bowl could be changed to make is not so steep and a shorter tool would be able to cut it.
I also am trying to make wooden boxes and didn't want to only have straight sides as all of mine to date have.
I would like a little taper to the bottom. Top is smaller than the bottom etc.
Rounder bottoms not 90* between the walls and the bottom.
Any and all help appreciated.
Ed
Bowl-like objects
I've had some success in cutting thin wall bowls using a combination of v bits and large round bottom bits (called bowl bits appropriately enough). The key to the geometry is matching the ofset of the guidelines and the angle of the v cutter to make a continuous and multicut diagonal down the inside and outside of the bowl. For example, remember that a 90 degree v bit cuts at a 45 degree angle, keeping the calculations simple.
Beyond that, I have amused myself by making bowl shapes that are not round. Matching the shape to the natural shape of a burl creates a bowl that could not possibly be turned on a lathe - up to things that look like a fluted jello mold.
Fastening the bowl is a challenge. I've glued my blank betrween sacrifical boards that I could clamp. Two holes drilled through through both boards allows indexing the position of the bowl with dowels on the table. The cutting geometry has to be flipped for the inside and the outside, as you are flipping your blank. After doing the outside, I flip the bowl, and cut the inside - machining right through the sacrifical blank.
Lots of trouble - yup. But try to get your lathe using pals to figure out how you did it without resorting to hand carving!
My guess is that someone will find a more elegant way to manage the clamping and indexing of the piece. But this proved to concept for me.
Like with turning, small cuts, sharp bits and high speeds allow thin walls without too many exploding pieces!
Chris
Beyond that, I have amused myself by making bowl shapes that are not round. Matching the shape to the natural shape of a burl creates a bowl that could not possibly be turned on a lathe - up to things that look like a fluted jello mold.
Fastening the bowl is a challenge. I've glued my blank betrween sacrifical boards that I could clamp. Two holes drilled through through both boards allows indexing the position of the bowl with dowels on the table. The cutting geometry has to be flipped for the inside and the outside, as you are flipping your blank. After doing the outside, I flip the bowl, and cut the inside - machining right through the sacrifical blank.
Lots of trouble - yup. But try to get your lathe using pals to figure out how you did it without resorting to hand carving!
My guess is that someone will find a more elegant way to manage the clamping and indexing of the piece. But this proved to concept for me.
Like with turning, small cuts, sharp bits and high speeds allow thin walls without too many exploding pieces!
Chris
Chris Lyon
c.lyon2@verizon.net
c.lyon2@verizon.net
Chris,
You have my interest in this.
One of my other hobbies is turning segmented bowels and vases.
I never considered bringing the two together...but if it is possible then that could present in itself a whole new set of challenges. And i do luv a good wood challenge
I would be very interested to hear more about this, if your willing.
Can you imagine the stress levels involved with watching a segmented piece that took
days to build being cut on with a high speed router under a computers control....
Chuck
You have my interest in this.
One of my other hobbies is turning segmented bowels and vases.
I never considered bringing the two together...but if it is possible then that could present in itself a whole new set of challenges. And i do luv a good wood challenge
I would be very interested to hear more about this, if your willing.
Can you imagine the stress levels involved with watching a segmented piece that took
days to build being cut on with a high speed router under a computers control....
Chuck