Broken valve stem? No problem!

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dbosch
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Broken valve stem? No problem!

#1

Post by dbosch »

So I took it as a personal challenge. A 236 valve stem with the splined end broken off. Could I recreate the end?

Turned down the end on the lathe, added the #4-40 threaded hole and then the fun began.

The end has 13 splines. I measured the circumference of the 3 jaw and marked it for 13 indexes. I don't have an indexing head and anyway, 13 splines is every 27.7degrees. I set up a cutter insert sideways in the tool post and slowly broached the spline set using the cross slide.
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Dan B.  ICCC #100
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Tgarner01
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Re: Broken valve stem? No problem!

#2

Post by Tgarner01 »

Looks good Dan! I wondered how a guy would go about broaching those splines. Thanks for sharing 👍
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gwillmot
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Re: Broken valve stem? No problem!

#3

Post by gwillmot »

Very impressive, although the description of how it was done was as clear to me as if spoken by a Wookie ........ glad some of us are so talented!
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outlawmws
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Re: Broken valve stem? No problem!

#4

Post by outlawmws »

Well done! I like your simple approach to cutting the splines!
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Deanofid
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Re: Broken valve stem? No problem!

#5

Post by Deanofid »

Neat, Dan. Atlas?
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dbosch
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Re: Broken valve stem? No problem!

#6

Post by dbosch »

Yessir. The later 6 inch one with the roller bearings.
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JLush
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Re: Broken valve stem? No problem!

#7

Post by JLush »

Well done sir! My father did some amazing work on a 6" Atlas so it's nice to see that the machinist spirit is still alive.
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Deanofid
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Re: Broken valve stem? No problem!

#8

Post by Deanofid »

One of the nicest lathes Atlas made was the 6" with the Timkin roller headstock. I have a plain bearing one that I used for some years, but it had to be put into storage to make some room in the shop, mainly because machines were starting to bump into each other. I don't know of any other real lathe that will cut more thread counts as the little Atlas until you get up to Monarch EE territory.
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"In Him was life, and His life was the Light of men."  John 1:4
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mgmlvks
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Re: Broken valve stem? No problem!

#9

Post by mgmlvks »

N I C E . I could only hope to have that vision . Thanks for sharing!
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MYN927
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Re: Broken valve stem? No problem!

#10

Post by MYN927 »

That was a great job done. I was pondering earlier how can I make a 13-splined hole in a brass insert that could fit into the splined valve stem.
JD37B
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Re: Broken valve stem? No problem!

#11

Post by JD37B »

Very clever! Thanks for sharing.
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Re: Broken valve stem? No problem!

#12

Post by CaptainFantastic »

I really like it when you talented guys share this stuff. Amazes me, it really does. I wish I had 1/100th the skill or knowledge, and the equipment, to do this stuff.
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Re: Broken valve stem? No problem!

#13

Post by Dmacp »

that's a neat trick. I will have to try to remember it.
Dan
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