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Sportster Motorcycle - Bottom End Cams, Cases, Gears, Flywheel, Piston Conecting Rods, Oil Pump, etc...

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  #21  
Old 19th October 2015
NRHS Sales NRHS Sales is offline
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Like Ranchero says the center of the cams is probably a lot softer than the outer hardened part. i just could not get to it with a cobalt drill bit.
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Old 19th October 2015
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The chances of either carbide or hss drills working well are not high...they tend to walk over the required distance. Gun drill (good) or EDM (best) are better processes.
You do not want to change to properties of the case hardening, which conventional even with through coolant, drilling would do.
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Old 20th October 2015
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Quote:
I'm not sure how your cam breather would work with the differential pressure spikes from the pistons moving up and down together. Oh, btw, the cam should be pretty soft in the center. A carbide end mill should eat through the induction hardened section @ .020"
[/QUOTE]

This set-up is just to separate the oil from the air, I will use a reed valve externaly.


...and btw, end mill was purchased today so I hope to find time to put a cam in the lathe soon.


.
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  #24  
Old 31st October 2015
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Tungsten carbide worked like a charm!

High speed slow feed and thru the hard layer it went.
Unfortunately I was too impatient and instead of switching to an cheep kobolt drill-bit for the soft part,
I feed to fast with the expensive tungsten one and it snapped on me.

Well, well, Amazon have more of them...

Here's the one that worked, left hand "tread" on it also, so a wery good tool for extracting broken bolts, like exhaust-studs.





Tore


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  #25  
Old 1st November 2015
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Um...I don't know what the one you had looks like but the illustration above is a rh twist.
Joe
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Old 1st November 2015
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Quote:
Originally Posted by Jollly Rogers View Post
Um...I don't know what the one you had looks like but the illustration above is a rh twist.
Joe
Yep, you are absolutely right about the picture, it was just the illustration pic that Amazon used...

Tore


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  #27  
Old 12th November 2015
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Progress...





.



.



Tore



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  #28  
Old 12th November 2015
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I think you should rifle it ... make a little pump out of it, to suck the air out of the crankcase.
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  #29  
Old 12th November 2015
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cannot wait to see how this works!!
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  #30  
Old 12th November 2015
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@ Aron

I guess the pressure from the pistons will be enough for that, this will be the only breathing for the engine.
I will also crimp on two discs to make the innlet diameter larger than the diameter of the cam to make greater sentrifugal forces for separating the oil mist out.

Tore

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