as requested on support…
rough dimensions
First, draw things up in profile…
The radius at the bottom looks to be quite large:
OK
The bottom rounding looks to be a full radius:
nudge it down:
Then use Trim vectors:
OK
Join Vectors
Yes
Delete the excess geometry:
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Once one has the profile there are two ways to cut out the design:
- draw a profile of the ball-nose tool (note that you will need to source one with a length suited to making the entire cut) and then measure a suitable number of perimeters and assign No Offset Contour toolpaths to circles of the requisite width and at the needed depth — for an example of that approach of modeling see:
- export half of the profile as an SVG and rotate it to make a 3D model, then import the 3D model into Carbide Create
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Draw in geometry to define the halving:
then use Trim Vectors:
OK
Join Vectors
Yes
Drag the geometry to the lower-left corner of the stock:
and export it as an SVG.
and rotate that into a 3D model and export as an STL
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Here is the v8 file:
For cutting the design it will be necessary to cut at least two sides:
More might be better:
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Another thought…
This is a design to cut it like a lathe with a 2.25 x 2.5 cylinder blank.
Insert a 1/4" shank into the blank.
Careful!! Even at the slowest speed (Mine is 8000 RPM) it will need to be very close to balanced to start with. I would bore the 1/4" hole (slightly undersized for a press fit) on the machine.
This one is for a lathe tool with a 0.010" nose radius.
You would post the program then replace all the Y moves with Z, and edit any of the Z moves accordingly.
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Yeah, sometimes a lathe is the right answer.
Im certain I could turn this faster on the lathe than set this up on my cnc. But, not everyone has one or chooses to simply complete on the cnc.
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I was talking about cutting it on my HDM, but setting it up like a lathe.
Chuck the part using a 1/4" shaft in the spindle
Use a vise to hold a turning tool
I did this for the sanding disks I made for the Mr. Fixit contest
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I see, I was wondering if that a viable solution? I guess that’s the emphasis of the holding of the part.
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