Pop this on the Wood turning forum/threads and see if you get any takers. I could do it but I wont be able to do it for a while, are you in a rush?
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Is there any reason that you can't drill the holes out to 22mm and use the 22mm dowel from Bunnings?
quoting from the advertising bumph for the Veritas® Dowel Maker - Lee Valley Tools
"The range of blade adjustment lets you make dowel as much as 1/16" undersize"
so at an intended 13/16ths dowel can be adjusted to achieve the approx .7 mm "undersize" required to clearance fit a 20 mm hole.
but for a few, this jig will do the job
https://woodgears.ca/dowel/rundstabhobel.jpg
I've ordered a guide that helps me build my own festool type mft table that includes a 20mm cutter/holes and that's the size I want to drill. Also many of the dogs, clamps, hold downs and accessories for mft tables supplied by companies like veritas are 20mm. So the most common size of dog holes and associated clamps are 3/4" and 20mm.
You might as well use 19mm dowels since there is the need to add a "spring" to hold the dog at the desired height. Usually, for round dogs, this is a wire in a groove along the side. An alternative would be to plane a flat and add a wooden spring. Then spokeshave the excess away. I think that you will end with a tight fit.
Personally, I would not be making dogs from Tassie Oak. I question whether it is not strong enough. I think it will bend and snap.
Regards from Perth
Derek
The problem with having 20 mm wooden dowels as dogs is that the dogs that are used with 20 mm holes are actually 19.xx mm in diameter depending on brand. Wooden dogs will change in diameter with moisture content and so will one day be tight and then loose.
In my case I turn my own ones out of a 20 mm aluminium bar and can make them to whatever fit I require.
If you really want to make your own just buy some 20 mm ali bar and sand it down to the fit you require.
.. or 20mm brass rod.
See the Veritas dogs as an example.
Regards from Perth
Derek
That's a great alternative Derek. Even Bunnings have 20mm stiff conduit which would work perfectly. Also, I didn't want to bother with springs on the dogs as the ones I want to make will have a rectangular cap at the top. As long as its snug with a "small" amount of movement then that's fine with what I want to do.
Bunnings also sell baluster rods in kwila which I think are 20mm. It's also a LOT cheaper than buying dowel if you only need short lengths. I was using it to make trampoline ladders. They are a couple of aisles left of the timber.
Cheers, Robbie.
Here is one for thinking outside of the box, if you really want to use dowel, try soaking a 19mm in water for a few hours, dry and test. Not swelled enough, soak a little longer etc. If too large a light sand should then bring them to size.
As an afterthought, when they are the right size, soak, coat them in a suitable sealer as they will swell / shrink depending on humidity.
That is "out of left field" but a bit too much mucking around. I've ended up buying some 20mm dogs
Good thinking.
They are 19mm and 22mm for a reason, they are imperial sizes that are written as metric for the Australian market. Same as screws saw blades and router bits.