If I honor the 3mm, the distance across the corners is 9.53mm
If I honor the 3mm, the distance across the corners is 9.53mm
Don't both of these results assume that the 60 degree dovetail ends up tangent to the circumference?
As far as I know, that isn't really a requirement.
The only reliable way is measure using pins because corners are burred or chamfered or whatever. If you tell me the wire diameter & outer distance combination (example 3mm & 13.06mm) that becomes the constraint & I can tell you the rest of the corresponding dimensions which result.
Absolutely. In fact, that's why I was happy that
@thestelster had volunteered to do the math. That left me the easy work of suggesting wires. If the angles are right, the wires always work.
@DPittman - as Peter has shown, the math is absolute but the measurements that go with the math are subject to many errors because of variables like chamfers, burrs, dovetail root, etc. Without reliable measurements, the math can't be reliably used.
The wires almost always work. So I use wires or rods or gauge pins to get a good repeatable reliable result.
One of your other measurements can also be improved with wires. Assuming they sit proud of the barrel OD between them, you can get the true height by measuring across both wires to the opposite side, and then subtracting the OD of the wires and comparing that to the OD of the barrel.
Somebody has to double check my math please.
It looks good to me Stel. Kudos to you for taking that on. That was the hard part if you ask me!