[AT] key-ways

[jtchall at nc.rr.com]

I'm thinking woodruff keys work better in shafts that turn in both 
directions since sudden reversing of direction could cause them to loosen up 
in the shaft if they are shallow like square keys. Most of the time I see 
woodruff keys in places like the front ends of old tractors. Rotating shafts 
like on a bushog or combine normally use square (at least on my stuff). 
Woodruff keys have to be matched to the correct cutter dia., not just the 
key width---they go normally by a 3 digit Industry number. Look up Woodruff 
cutters here: 
http://www.mscdirect.com/browse/tn/Milling/Woodruff/Keyseat-Cutters?searchterm=woodruff&navid=4287923608

It’s a lot easier to just use a straight key, that’s generally what we do at 
work on something we design.

John Hall


-----Original Message----- 
From: Greg Hass
Sent: Monday, November 09, 2015 2:00 PM
To: at at lists.antique-tractor.com
Subject: [AT] key-ways

I'm working on an "invention" for my roll-over plow. More when I have
time. It will have 2 shafts with a sprocket in the middle and rubber
blades on each end (similar to the straw spreader on combines) . I will
need 3 keys on each shaft; each shaft is about 20 inches long. My
question is; should I use straight keys or half moon keys. They will be
powered by a hydraulic motor that ran the reel on a IH 715 combine.
       Greg Hass
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