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The easy answer is you really cant use a pinch type coupler and splines and get it to tighten. It cant squeeze because it would only pull where the pinch bolts are until it took up the clearance in...

The shaft is centerless ground, to be out of balance either the material would have to be not homogeneous or the taper machined out of concentricity to the body of the shaft. The keyways should be...

Earlier today I said I waited tii this morning so I had a clear head to make sure I had read something correctly. Actually it was related to Makers 46. Now I need to head out for a new bottle.

http://www.mercurymarine.com/propellers/about/how-propellers-work/
This is the best description of how I have understood a prop to work. Water is always flowing in behind the prop to fill the...

I had to wait til morning when I was a little more clear headed and I still don't get what you are saying. Please talk hydro or flatty . I get the hydro makes no thrust when the prop is in the air. ...

GN brought up a good additional point about materials. If someone has a basket full of forgings of a certain material "A" what good does mapping a prop do when I have a prop from another material...

But theer has to be material to work with to change the profile on a cnc but I thought some props ears were worked, call it bending if that is correct. I guess my point was, I hope that knowledge...

I have an honest question that I'd like some input on. Has anyone ever done the prop end in splines like a drag axle and splined the prop. I don't know that that interference fit of a matched taper...

Centerless ground finish on the size and material of a rocker shaft is easy. Grinding or machining high nickel, chrome and some other alloys is a bitch to do period. Getting a finish that doesn't...

I need to clarify my previous post. I am a geographic undesirable in most of these talks : I don't know any of these people because I'm 2000 miles away. What usually gets lost is the craftsmanship...

I like the idea of a nc'ed prop BUT in an ideal world it is the best solution. As someone who actually had a machine shop and was killed by the "digitizing" thing, the work will go overseas once that...

Or if you have crush grinding on the c-less you reduce the diameter in increments and let it outfeed. Turning on its own diameter will lessen the chance of leaving the prop end too far out of whack....

The poster mentions having to enlarge his coupler to 1" so I guess I assumed only the prop end was at 1" ,hence what I said about the expense. Not looking to endure the wrath of anyone but I doubt...

Separately from the above , centerless grinding is a primarily a high production process , setup and the guides for doing a step grinding from 1" to 7/8 would be a relatively pricey thing and finding...

Something to consider when dealing with centerless ground stock is you can't determine the roundness with a set of mics. The process of centerless grinding can produce a shaft out of round way beyond...

This is way outside my expertise. but I've seen a hole in the strut supposedly to let water into the barrel. When you are sitting still the barrel should fill except for trapped air; even if nothing...

I hope I can make this understandable because I'm not good at posting pics. If you could make the I.D. of the collar a "D" shape where the flat of the "D" matched the flat on the shaft, metal to...

A spot face would work for the set screw if you hit the same spot every time and it didn't get to mushrooming out to raise a spot on the shaft. The easiest way is a flat slightly wider than the face...

If I were going to do anything to improve the prop shaft, it would be to cryo-treat. There is no dimensional change and it re-arranges on a molecular level. In todays world you don't have any idea...

Sorry GN I guess I got lost in the drawings, but this is probably worse. Like you said the round key might try to roll if the locking taper wasn't perfect and would have a wedge action. This area...

If there is any force applied to the key you have some issues. The square key is a locational item only. If your prop shaft is properly done there should be a milled flat where the set screws contact...