Discussion in 'Tips and Tricks' started by Anatol, Aug 25, 2018.
Interesting idea, thanks
It's called an involute spline. Made to reduce stress points and give greater strength than a square form spline.
This half round form is probably a Wildhaber Novikov gear
Could the male and female shafts be drilled together and when taken apart pins fitted to the male
to form the splines ???
A bit of light reading for anyone interested. https://ac.els-cdn.com/089571778990...t=1535636725_ab67e02e4098ef7f32403fc735c5dde9
Looking closely at the splined shaft it appears the spline was first cut to depth with an end mill, then a wheel type cutter was run down the slots to form the profile.
I'm wondering why you would put set screws on a splined coupling? Seems to me that would defeat the purpose of the splines.
I'm no engineer, just a tinkerer, but my understanding is the reason for a splined connection is to provide a positive drive, while allowing a limited axial movement or some leeway in axial placement.
Thank you for the complement.
Just for the record:
Is exactly how I would do it.
Thankyou! A name for it. Makes sense, this is a high torque low rpm application. But I think, strictly speaking, a splined shaft is a not a gear, for obvious reasons - one part - the coupling - doe not rotate around the other.
I read that article from WILDHABER-NOVIKOV GEARS APPLICABLE. It make a lot of sense in his theory but I wonder why his was not kept because of load and stress. Somethings we just do not understand.
I think the document was written in Europe and the lingo is differ than ours. I remember reading the word pinion and that is something in clocks.
Root bending stresses of pinion and gear with different loading positions have been analyzed. Effects on root stresses due to variations of fillet radius and normal pressure angle of pinion have also been investigated.
I believe it was a good coupler for its application. It is different for sure.
It is pretty common in mechanical drives to refer to the small gear as the pinion. Thus the term rack and pinion where the rack has an infinite diameter.
I think your method of drilling holes on the pcd and boring out he center is workable. Ig you make he female spline long enough you can eliminate the need for hardening. Most tractor PTO shafts and couplings I worked with were unhardened.
Forgot to mention that I was in Edinburgh a fortnight ago. Nice example of the fluting in Rosslyn Chapel next to the Apprentice's Pillar. That has the mystical helix carved in it.
I have seen something very similar on a 1920's Miller 8 race car engine. nuts were circular with 4 semicircular cuts on the periphery. The socket was a cylindrical hole with 4 hard pins set into the body projecting halfway into the hole. Why it was don this way I do not know! Bill in Boulder CO USA
The earliest gears were wooden wheels -with round wooden pegs to intermesh with others.
Once the average tutor struggles to get students to understand Archimedes, everyone has lost interest .
Once of the best bits of machinery was the Gutenberg printing press and made with wooden pegs as gears- some like what the topic started out as
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