outer ridges on a coin
outer ridges on a coin
Looking at making a personal USMC coin for my son
anyone have a clue as to making the outer ridges (reeding) of the coin
I have a 3 axis machine
ty
andy
anyone have a clue as to making the outer ridges (reeding) of the coin
I have a 3 axis machine
ty
andy
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- Vectric Wizard
- Posts: 1013
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- Location: France
Re: outer ridges on a coin
Something like this?
Simply use a 3D vector for the ridges and cut it with a 2D profile toolpath with a small end mill. In this case, I use the 3D rope clipart and used the create boundary vector function to generate the appropriate vector.
Got a nice result engraving in paperstone. The outer cut was made with a Ø6mm end mill. The medal Ø is about 50mm.
Simply use a 3D vector for the ridges and cut it with a 2D profile toolpath with a small end mill. In this case, I use the 3D rope clipart and used the create boundary vector function to generate the appropriate vector.
Got a nice result engraving in paperstone. The outer cut was made with a Ø6mm end mill. The medal Ø is about 50mm.
Best regards
Didier
W7 - Aspire 8.517
Didier
W7 - Aspire 8.517
Re: outer ridges on a coin
awsome idea
ty so much
works great
ty so much
works great
- TReischl
- Vectric Wizard
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Re: outer ridges on a coin
If you are talking about putting the ridges on the rim of the coin (like on a quarter, half dollar, etc) there is no way I know of to do it on a 3 axis machine. This requires a rotary axis (which can be used on a 3 axis machine which has either the X or Y axis locked).
"If you see a good fight, get in it." Dr. Vernon Johns
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- Vectric Wizard
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- Joined: Fri May 15, 2015 1:10 pm
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Re: outer ridges on a coin
Sorry, I meant a 2D vector of course.LittleGreyMan wrote:Simply use a 3D vector for the ridges
Best regards
Didier
W7 - Aspire 8.517
Didier
W7 - Aspire 8.517
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- Vectric Wizard
- Posts: 1013
- Joined: Fri May 15, 2015 1:10 pm
- Model of CNC Machine: 3 axis small size machine
- Location: France
Re: outer ridges on a coin
Here is the final result. Unfortunately, I have no photo which shows the ridges.
Best regards
Didier
W7 - Aspire 8.517
Didier
W7 - Aspire 8.517
Re: outer ridges on a coin
how did you get the flat part so clean and shiny with no cut lines
have heard the only way is a de-burring tool using a special machine
have heard the only way is a de-burring tool using a special machine
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- Vectric Wizard
- Posts: 1013
- Joined: Fri May 15, 2015 1:10 pm
- Model of CNC Machine: 3 axis small size machine
- Location: France
Re: outer ridges on a coin
The tool is called Photoshop.
Just kidding, there is no photo editing.
If you look carefully, you will see shallow cut lines.
Here was the process:
-roughing toolpath: Ø6 mm endmill with 0.2 mm allowance
-finishing raster toolpath 1: Ø6 mm ball mill along X (0°), 10% stepover
-finishing raster toolpath 2: Ø3 mm ball mill along Y (90°), 10% stepover
-finishing offset toolpath 3: 30° engraving bit, 40% stepover (only 0.2mm with a 0.5mm flat Ø)
Using so many toolpaths was probably over cautious but I had never cut this material before. No manual finishing, just a spay paint.
If want a good result, you'll have to run several finishing toolpaths. For larger parts, using rest machining is generally a good option. Just think out of the box (the screen when you use a CAM): think of the physical process and what will physically happen when you run the toolpaths.
And believe Vectric's simulation tool, it is very reliable and useful. But you will sometime reach limits of a screen rendering. In this case, cut lines were much more visible on screen than on the actual part.
Hope this helps.
Just kidding, there is no photo editing.
If you look carefully, you will see shallow cut lines.
Here was the process:
-roughing toolpath: Ø6 mm endmill with 0.2 mm allowance
-finishing raster toolpath 1: Ø6 mm ball mill along X (0°), 10% stepover
-finishing raster toolpath 2: Ø3 mm ball mill along Y (90°), 10% stepover
-finishing offset toolpath 3: 30° engraving bit, 40% stepover (only 0.2mm with a 0.5mm flat Ø)
Using so many toolpaths was probably over cautious but I had never cut this material before. No manual finishing, just a spay paint.
If want a good result, you'll have to run several finishing toolpaths. For larger parts, using rest machining is generally a good option. Just think out of the box (the screen when you use a CAM): think of the physical process and what will physically happen when you run the toolpaths.
And believe Vectric's simulation tool, it is very reliable and useful. But you will sometime reach limits of a screen rendering. In this case, cut lines were much more visible on screen than on the actual part.
Hope this helps.
Best regards
Didier
W7 - Aspire 8.517
Didier
W7 - Aspire 8.517
- martin54
- Vectric Archimage
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- Location: Kirkcaldy, Scotland
Re: outer ridges on a coin
There are different ways to machine & leave no or very faint cut lines, you could use a pocket toolpath with an endmill for the flat parts, just use vector boundaries to define the pocket cut.aroff wrote:how did you get the flat part so clean and shiny with no cut lines
have heard the only way is a de-burring tool using a special machine
The size & stepover of a ball nose bit will also make a difference if machining as part of a 3D model, smaller the step over the less chance of having machining lines
Re: outer ridges on a coin
i have 1/64 and 1/32 bn and em
will have to try it
have ordered copper, aluminum and brass
cant buy it locally
will have to try it
have ordered copper, aluminum and brass
cant buy it locally
- TReischl
- Vectric Wizard
- Posts: 4645
- Joined: Thu Jan 18, 2007 6:04 pm
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- Location: Leland NC
Re: outer ridges on a coin
Aroff, you might check the local scrapyard if you cannot find it locally.
There are no stores here that sell copper, etc, but wow, the scrapyard has literally tons of it separated out. Sheet, bar, fittings, you name it.
There are no stores here that sell copper, etc, but wow, the scrapyard has literally tons of it separated out. Sheet, bar, fittings, you name it.
"If you see a good fight, get in it." Dr. Vernon Johns
Re: outer ridges on a coin
never gave it thought
ty
ty