bridge saw cutter for marble with rotating table
22 Sep 2023 20:18 #281413
by glct12
bridge saw cutter for marble with rotating table was created by glct12
Hello
I am working on a project, to convert an old bridge saw cutter for marble with rotating table for the work piece
to a cnc milling machine. My question is how to configure the kinematics of the 4-axis system.The tool is a disk saw (20cm .. 30cm diameter)
that moves in x,y,z axes and at the same time the work piece table can rotate when making curves.
I am going to use servo drives with analog reference inputs and incremental encoders for feedback.
For the logic interface I will use some mesa cards.
Any suggestion for the appropriate cam processor for the gcode generation of dxf files?
I am already familiar with linuxcnc and mesa cards that i have used in the past on other projects.
Thank you in advance.
George
I am working on a project, to convert an old bridge saw cutter for marble with rotating table for the work piece
to a cnc milling machine. My question is how to configure the kinematics of the 4-axis system.The tool is a disk saw (20cm .. 30cm diameter)
that moves in x,y,z axes and at the same time the work piece table can rotate when making curves.
I am going to use servo drives with analog reference inputs and incremental encoders for feedback.
For the logic interface I will use some mesa cards.
Any suggestion for the appropriate cam processor for the gcode generation of dxf files?
I am already familiar with linuxcnc and mesa cards that i have used in the past on other projects.
Thank you in advance.
George
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23 Sep 2023 07:12 #281439
by andypugh
Replied by andypugh on topic bridge saw cutter for marble with rotating table
This sounds like a fairly conventional XYZC machine.
Do you need to coordinate the table rotation to the other motion, or us it largely indexing?
Do you need to coordinate the table rotation to the other motion, or us it largely indexing?
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23 Sep 2023 08:15 #281444
by glct12
Replied by glct12 on topic bridge saw cutter for marble with rotating table
The axis C is rotating relative to Z axis and coordinated with the other motion.
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23 Sep 2023 08:27 - 23 Sep 2023 08:33 #281445
by Aciera
I have difficulty picturing this. How are you cutting a curve with a disk saw?
[edit]
Is like at 1:07 in this video (only in your case the work piece rotates)?
If so you don't need any special kinematic in LinuxCNC.
Replied by Aciera on topic bridge saw cutter for marble with rotating table
The tool is a disk saw (20cm .. 30cm diameter)
that moves in x,y,z axes and at the same time the work piece table can rotate when making curves.
I have difficulty picturing this. How are you cutting a curve with a disk saw?
[edit]
Is like at 1:07 in this video (only in your case the work piece rotates)?
If so you don't need any special kinematic in LinuxCNC.
Last edit: 23 Sep 2023 08:33 by Aciera.
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23 Sep 2023 08:39 - 23 Sep 2023 08:51 #281446
by Aciera
Replied by Aciera on topic bridge saw cutter for marble with rotating table
If you want to cut noncircular curves or circular ones that have centers that do not coincide with the axis of the rotary c table then you would need a fairly capable CAM. But I don't see how a custom (ie non-trivial) kinematic could be of any use here.
[edit]
Ok, I maybe kind of get it. For the mentioned cases above. You'd want to rotate the C table so the saw remains tangential to the curve and you'd then need the kinematic to adjust the XY-position according to the C axis angle.
For this you could use for example the included XYZAC-trt kinematic and just ignore the A axis.
However you would need a way to calculate C-axis angles depending on the tools position along the arc.
[edit]
Ok, I maybe kind of get it. For the mentioned cases above. You'd want to rotate the C table so the saw remains tangential to the curve and you'd then need the kinematic to adjust the XY-position according to the C axis angle.
For this you could use for example the included XYZAC-trt kinematic and just ignore the A axis.
However you would need a way to calculate C-axis angles depending on the tools position along the arc.
Last edit: 23 Sep 2023 08:51 by Aciera.
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23 Sep 2023 08:51 #281448
by glct12
Replied by glct12 on topic bridge saw cutter for marble with rotating table
The machine is similar to the one in the picture.
The table (C axis) is rotating relative to Z axis, which is perpendicular to XY plane.
The disk diameter could be 20cm in minimum.
The table (C axis) is rotating relative to Z axis, which is perpendicular to XY plane.
The disk diameter could be 20cm in minimum.
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23 Sep 2023 08:55 - 23 Sep 2023 09:04 #281449
by Aciera
Replied by Aciera on topic bridge saw cutter for marble with rotating table
Like a tangential knife with the C-rotation done by the work piece.
[edit]
Should be possible, I guess. If the calculation of the c-axis angle could be integrated in the XYZC TCP kinematic then you might not even need a CAM. It would just be a regular 3 axis gcode.
I'm not sure I'd want to be the one responsible for writing the c angle calculations though. Just imagine the mayhem if it missed a discontinuity in the math and the resulting angle suddenly changed from positive to negative.
[edit]
Should be possible, I guess. If the calculation of the c-axis angle could be integrated in the XYZC TCP kinematic then you might not even need a CAM. It would just be a regular 3 axis gcode.
I'm not sure I'd want to be the one responsible for writing the c angle calculations though. Just imagine the mayhem if it missed a discontinuity in the math and the resulting angle suddenly changed from positive to negative.
Last edit: 23 Sep 2023 09:04 by Aciera.
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23 Sep 2023 09:10 - 23 Sep 2023 09:24 #281450
by Aciera
Replied by Aciera on topic bridge saw cutter for marble with rotating table
Actually SheetCAM seems to offer a ''Dragknife" module that may take care of the angle calculations:
sheetcam.com/Register/purchase
[edit]
seems this user also uses the SheetCAM solution for this.
www.forum.linuxcnc.org/10-advanced-confi...h-xy?start=50#248422
sheetcam.com/Register/purchase
[edit]
seems this user also uses the SheetCAM solution for this.
www.forum.linuxcnc.org/10-advanced-confi...h-xy?start=50#248422
Last edit: 23 Sep 2023 09:24 by Aciera.
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23 Sep 2023 15:45 #281483
by glct12
Replied by glct12 on topic bridge saw cutter for marble with rotating table
Regarding the video you attached, the only difference i see is that in my machine,
instead of rotating the disk saw, the table rotates.
instead of rotating the disk saw, the table rotates.
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23 Sep 2023 23:54 #281517
by tommylight
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The picture you posted, that is not of your machine, i have seen those and have access to if the need arises, but much bigger. Same everything, but bigger, Italian made, NC controlled, etc.
Replied by tommylight on topic bridge saw cutter for marble with rotating table
Posting a real picture of the actual machine would save us a lot of time trying to guess, so why don't you?The machine is similar to the one in the picture.
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The picture you posted, that is not of your machine, i have seen those and have access to if the need arises, but much bigger. Same everything, but bigger, Italian made, NC controlled, etc.
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