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Internal splines
- Thread starter Garyt
- Start date
I believe your right, the prop is aluminum, but that is bolted to the hub that contains all the prop pitch control jazz, I think a lot of the internals there are steel
I could be wrong as well, but I'm Fairley confident the mosquito (and most prop planes from that era on) have a variable pitch propeller, Wich has a bunch of stuff in the prop hub
Well I know of a quarter scale Merlin that was steel! LOL.
www.homemodelenginemachinist.com
Quarter Scale Merlin V-12
The quarter scale Merlin's prop shaft is a scaled version of a design that's still in use today on full-size aircraft. It's externally splined, and its end is threaded for a castellated prop nut. In order to fit a propeller to this shaft I designed a splined hub that will become an integral part...
www.homemodelenginemachinist.com
Tom Kitta
Ultra Member
Using EM for small internal splines is doable as I did similar for similar projects - but it does not work too well for something that is ... big.
One could see whatever one could do some kind of indexed broaching. But it would take a long time.
There must be a way to do these things faster in a home shop!
One could see whatever one could do some kind of indexed broaching. But it would take a long time.
There must be a way to do these things faster in a home shop!
I am excited to see all of the interest in my question. No it will never leave the ground it is only for a test stand.
I am assuming that anyone interested would insist on making their own measurements. If nothing else it will include time with historical engines and aircraft. This is not a time sensitive thing we take years to get things done.
Gary
I am assuming that anyone interested would insist on making their own measurements. If nothing else it will include time with historical engines and aircraft. This is not a time sensitive thing we take years to get things done.
Gary
I've never cut them but I think there potentially more to internal spline geometry form depending on the application. I am only guessing, but judging by pictures I'd be surprised if the spline slots were simple rectangular profile. This part is both a specialized & vintage so the geometry might be unique even by todays standards. I think splines might be analogous to gear tooth forms, they look roughly similar from across the room, but there is likely a lot of detail for them to function properly. Profile, clearance, stress relief fillets... all that good stuff.
I'm not quite sure what you mean my 'end milling' the internal profile. Do you mean roughing out the mass before finishing to the (typically curved) profile. Or a custom cutter with the curved spline profile? How would you get that tool in & out of (guessing) 4" bore x 6" length when EM must spinning perpendicular to the ID surface?
You mean a 'running engine' test stand or a 'static display' stand?
Watched what?
Yah I meant milling out the bulk of the material with larger than smaller EMs but only if the part is fairly thin. 1/2” maybe. That is not going to work on this long part.
Tom O
Ultra Member
Dabbler
ersatz engineer
I have some, and @Tom Kitta used to have some billets that big.
