Pen Turning Bushes

When turning wooden pens, a bush is used at either end to both centre the brass core where it is larger than the standard pen mandrel, and secondly, and importantly, it is a guide to how far to turn the blank so it ends up flush with the pen hardware.

While turning a pen recently (a Sierra), I was somewhat confused why I seemed to have a lip between the timber and the pen tip hardware.  Now I know for a fact that I had turned and finished the timber absolutely flush with the bushes, so there should not have been any lip at all.

After thinking it through, and thinking it through, I came to only one conclusion – not that the bushes were the wrong size, but that one was wrong – in other words, the bushes supplied were both for one end only, and that they should have been different sizes, and weren’t.  The difference is only 0.5mm in diameter (as in the timber was oversized), but it was enough to mean I was not satisfied with the result.  So, I thought it would be useful to record all the different pen design mandrel dimensions, at least so I had a record of them, and in turn they may prove useful to others. (In this case I found a bush the right size, remounted the pen, shaved off what I needed, and refinished. Yes – very frustrating, but I couldn’t leave it “not right” when I knew there was something more I could do).

So to start the record (and with the intention this will made into permanent pages down track as the range grows to a respectable size, including drill bit sizes, and images of the different pen kits, before and after).

Sierra (Dayacom)

1 x 12.40mm w 9.80mm shoulder
1 x 11.90mm w 9.80mm shoulder

Shaft OD 10.30mm
Shaft Length 55.80mm

Elegant Beauty (Dayacom)

2 x 11.95mm w 8.25mm shoulder

Shaft OD 8.85mm
Shaft Length 50.10mm

Sedona (Dayacom)

2 x 12.15mm w 9.55mm shoulder

Shaft OD 12.25m
Shaft Length 48.25mm

2 x 14.35mm w 11.70mm shoulder

Shaft OD 10.15mm
Shaft Length 53.05

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