Phil Pascoe
Established Member
I think you missed my point, Pete. If the top of the bench sloped an eighth it would have exactly the same effect as the sticks being an eighth different. None.
patrickjchase":1g5ucj4t said:Pete Maddex":1g5ucj4t said:Why?
Pete
Because if the sticks are different heights and you don't line up exactly parallel then you'll get a "false positive" reading for twist. That doesn't happen (in theory) if they're the same height.
phil.p":3pi9ask9 said:I think you missed my point, Pete. If the top of the bench sloped an eighth it would have exactly the same effect as the sticks being an eighth different. None.
Yep.Pete Maddex":2oj4vype said:You are only checking the surface that the stick are on nothing else, so the position of your bench or the underside of the wood doesn’t matter.
Pete
Not if they are parallel and same heightMikeG.":fxz7km6o said:patrickjchase":fxz7km6o said:Pete Maddex":fxz7km6o said:Why?
Pete
Because if the sticks are different heights and you don't line up exactly parallel then you'll get a "false positive" reading for twist. That doesn't happen (in theory) if they're the same height.
No, Pete, that will happen anyway if the sticks aren't parallel.
Nope.This really is overthinking a very simple sighting aid. The only two things you need to make winding sticks work are that they are straight (one of them...the near one....... also needs to be parallel top-and-bottom. The far one doesn't even need to be that) and that they are both laid out at right angles to the board. Anything more than that is a bonus, and an unnecessary complication for a beginner.
Jacob":29wdl01d said:.........Nope.
They have to be identical, which isn't difficult even for a beginner.
They don't even have to be at right angles to the board, though that's how you'd do it (approximately) without giving it a thought.........
Perspective doesn't come into it.MikeG.":uo6f07x7 said:Jacob":uo6f07x7 said:.........Nope.
They have to be identical, which isn't difficult even for a beginner.
No, they absolutely do not. Unless of course perspective doesn't exist in your workshop. I accept that making them identical is easy, but there is no cost whatever in their efficacy if they aren't.
They don't even have to be at right angles to the board, though that's how you'd do it (approximately) without giving it a thought.........
Again, there it is again: that perspective-free anomaly in your workshop.
Jacob":tbu9cl5j said:MikeG.":tbu9cl5j said:Perspective doesn't come into it.
Have a go with some bits of wood Mike.
I could do some photos but people obviously need to work it out for themselves!
Jacob":2p1dzydy said:oh yes here they are
Jacob":x7dgnr09 said:Bottom edge will work of course........
Jacob":x7dgnr09 said:......................Nope. They have to be identical........
Jacob":lma83quc said:........PS easy to prove: set up your sticks on a flat surface with top edge and the further stick bottom edge in line. Turn the further one a bit skewed across, and they won't be in line.
MikeG.":lma83quc said:........Obviously, this works only if the sticks are at right angles to the board, so, believe it or not, I put them at right angles to the board...........
Jacob":143dnw6o said:If not identical, or if using top/bottom edge - they have to be parallel or there will be an error.
It's just simple geometry.
Top to top identical edge means no error and you don't have to set them parallel or at right angles to the workpiece, you can just drop them on, any old flat surface, even if it has a wany edge or is a disc!
galleywood":1q9o52it said:I think care needs to be taken when saying that sticks need to be parralel.
There is a need for the sides of one (or both, depending on your point of view) to be made parralel.
There is a separate need for the sticks to be placed parralel when sighting them on a board.
Without clarification it is easy to misinterpret.
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