Radiused sanding blocks

[Unixbeast (Dave Hastings)]

Hey all,
looking for some advice on how to make something that seems like it should be simple. A radiused sanding block (for guitar fretboard sanding).
I have some rectangular blocks of purple heart sitting around that I thought would be great for making sanding blocks given the hardness of the wood. It seems like it should be a simple task to model this is carbide create, but I can’t get it quite right. A link to a tutorial or previous forum post is more than welcome (I wasn’t able to find any, but some concepts looked close to what I was trying to do)
The scenario is simple. Start with a rectangle, Something like w:6", l: 2 7/8", h: 1 3/8". Then on the top side of the block make a 7.25" radiused cutout, and on the bottom a 9.5" radiused cutout.
Something like this: https://a.co/d/4xfamGc. The edges don’t necessarily need to be rounded over like in the picture, but bonus points if I could get that too

Thanks in advance,
Dave

[WillAdams (William Adams (Carbide 3D))]

The technique for this is shown at:

Spoon Possible without CC Pro?

I’d like to make a wooden spoon and was wondering if that’s possible to do with the standard CC? Can it be done with a bowl bit? I don’t have one but can pick one up. Thanks!

This could be done in Carbide Create Pro using 3D modeling, or 2D with a bit of patience.

[WillAdams (William Adams (Carbide 3D))]

First, set up the file:

Then, draw up the cut in profile:

The easiest way to align these is to duplicate the stock profile and increase its height:

and then add the circles to the selection and use Trim Vectors:

OK

Delete the extended geometry:

Then drag geometry into alignment:

Then draw in the stock:

rotate it and drag it into alignment with the end profile:

Then draw up the tooling which you will use:

and draw a line as tall as the block:

then drag the outline of the tool into alignment with the curve:

then drag the line into alignment with the tool outline:

Then measure:

and assign a No Offset Contour toolpath to that depth:

Repeat this until one gets to the bottom…

[WillAdams (William Adams (Carbide 3D))]

Or, if one wishes to use Carbide Create Pro, one would either create this as a 3D model, or one can draw up the profile as above:

Join Vectors to close:

and then export as an SVG and extrude in a tool such as OpenSCAD:

then export as an STL

sandingblock_extrude.stl (19.0 KB)

and import into Carbide Create Pro:

then assign 3D toolpaths:

If one wishes to cut both sides:

Attached as a v7 file.

radiused sanding block_pro_v7.c2d (268 KB)

[Unixbeast (Dave Hastings)]

Thanks Will!

I had a chance to try this today. I went the pro route since I have it. I used Autodesk Fusion to do the extruding and export the STL.
All worked like a charm. I even went back and put some text on the side so I know the radius at a glance.
Thanks again for the help,
Dave