Split Mandrel Sanding

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This article was originally posted by Del1r1um[1]

Hey guys, I posted these pics on another thread and I thought that I might as well explain my process in greater detail so that everyone can see what I do with my slotted mandrel for sanding blades. I don't claim that this is the only way, or even the best way... it does seem to work for me though.

Step 1[edit | edit source]

The first thing I do is decide on the size of "flap wheel" I want. This depends a lot on the razor. For a big wedge I use a piece of sandpaper just over two inches long (and the width is just under the size of the mandrel slot). For a hollow blade, I use a piece that is about half the size (in all dimensions) of the wedge strip.

Then I fold the paper so that the two ends meet in the middle and tape around where they join with some scotch tape (anything will work as long as it still fits in the slot).

SplitMandrel 001.jpg

Step 2[edit | edit source]

I secure the sandpaper with a rubber band. You can see how I wrap it in the picture... a smaller band works better (fewer wraps are required).

SplitMandrel 002.jpg SplitMandrel 003.jpg

Step 3[edit | edit source]

I set this up in my dremel with a flex shaft and go to work with a slow speed (my preference) and a very light hand. I figure that if I go slowly and carefully the tool will do the work and I'm less likely to make a mistake. Don't make the mistake of getting impatient and trying to bear down on the workpiece. light and careful... slow and steady.

SplitMandrel 004.jpg

Step 4[edit | edit source]

Note: you must know which direction the flap spins in and adjust your sanding passes accordingly. I use a pass where the tool spins parallel to the edge, and at a 45 as in the graphic. In the 45 degree case, the arrows show the direction of the spin of the tool. hold the tool at a 45 and move it from toe to heel or the other way around, depending on spin direction and which edge you are working on.

NEVER sand into and edge.. the flap should sand in a motion that goes from the middle of the blade OUT to whatever edge you are working near. I tried to make this obvious with the arrows always pointing out to the edges. When you get anywhere even close to an edge you will have to change your position to make sure that you are sanding from the middle out. Basically match the direction of the spin, to the arrows on the graphic.

SplitMandrel 005.jpg

References[edit | edit source]