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26th Feb 2016, 09:54 PM #1Golden Member
- Join Date
- Sep 2008
- Location
- Riddells Creek, Vic.
- Posts
- 838
Tailstock Barrel Key - Colchester Master
The barrel key on my lathe tailstock was pretty worn and beat up allowing quite a bit of slop in the keyway, which does not really effect anything but, has always annoyed, me so I made a new one, or two, actually. This is a really simple part but requires quite a few different processes in it's manufacture.
The first step was to turn and mill them slightly oversize to allow for final grinding to size after hardening. Material is EN36A,30mm Diameter.
Old and New.jpg
In the furnace at hardening temperature after previous pack carburising. I forgot to photograph the carburising process.
Hardening temperature.jpg
Quenching in Heat Transfer Oil.
photo.JPG
Hardness Testing - Result 60 Hrc.
Hardness Test 1.jpgHardness Test 2.jpg
Ready for grinding to final size.
Parts Manual.jpg
Grinding the O/D on a purpose built fixture after grinding the top and bottom surfaces.
photo 1.JPG
Grinding the actual key flanks to size.
photo 2 (1).JPG
The finished products and fixture.
photo 3.JPG
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27th Feb 2016, 08:33 AM #2Mechanical Butcher
- Join Date
- Oct 2004
- Location
- Southern Highlands NSW
- Posts
- 1,898
That's neat.
Was the original key hardened?
What grit is the grinding wheel you used? I'm curious as I want to buy the right one for my recently acquired surface grinder.
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27th Feb 2016, 08:50 PM #3Golden Member
- Join Date
- Sep 2008
- Location
- Riddells Creek, Vic.
- Posts
- 838
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