That sounds like my kind of solution. Our prop shop guy would turn down the end of a shaft pretty cheap I think. For that matter I could use the motor as a freestyle lathe maybe.
So your application was in an electric outboard conversion? Exactly what were you doing as far as interfacing what with what? I am guessing you were adapting a 7/8" motor shaft to an outboard vertical drive shaft. I don't suppose you have pics? Well no worries I will use my google-fu.
So I think what I need to do is cut off the ends of an outboard shaft, and turn them both down so that one fits a 1" round keyed shaft coupling on one end and has its splines on the other, then the other cutoff end turn down to 7/8" in similar fashion, couple them to their respective shafts with keyed couplers, and join the two splined ends with a spline shaft coupler, secured to one of the splined stubs so that the other end has a bit of axial slip. Does this sound right?
Another option... would a normal 7/8" round shaft coupler grip a splined 7/8" shaft strongly enough, and line up true with the round shaft at the other end of the coupling?
When you mention epoxy, do you mean you used it to prevent axial motion? I am only doing this so that I can HAVE a bit of axial play to make up for any inadequacies of a thrust bearing and its mounting.
---In electricboats@yahoogroups.com, <matwete@...> wrote :
When it comes to spline interfacing, you might try to find parts that already have the spline, then have it ground down to fit, e.g. a straight- or keyway-coupler (or whatever). I was making my own 14-point spline-to-7/8" keyway couplers using 7/8" couplers & JBweld shaped into the spline shape. They'd last about a month, then suddenly shred. I later found that outboard lower units used the same spline on top as on bottom. The local marine salvage yard sold me a pinion gear that had my 14-point spline for just $35. With that and a 7/8" coupler, I handed them over to a machinist who ground down the pinion gear hub OD until it fit into the 7/8" coupler. Slapped some epoxy on the pinion gear and pushed the two together…it's an odd looking coupler but it's delivered flawlessly now for 10 years or more. Maybe you could do something similar?
From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com] On Behalf Of king_of_neworleans
Sent: Saturday, May 13, 2017 9:10 AM
To: electricboats@yahoogroups.com
Subject: [Electric Boats] Anybody Using a Splined Joint in their Drive Train?
It occurred to me that having a little axial slip in the shaft somewhere between thrust bearing and motor would be a good thing. 2 hours of googling failed to turn up an ideal solution for my 7/8" motor shaft and 1" prop shaft. I know many golf carts use splined motor hubs. What I want to do is adapt the 7/8" motor shaft to maybe a 1" female 6 spline coupler, then couple a short 1" splined shaft to the 1" round drive shaft, so if there is any play in the thrust bearing, it won't allow any load to be transmitted to the motor. Has anybody here done anything like that? I would like to avoid a custom machined solution if I can. From what I am seeing that would cost me a minimum of $400 to $600. Off the shelf components would be really sweet.
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