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split cotter dimensions

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russ57:
Hi all
i have a need for a clamp, and i think a split cotter type would work well.
http://www.thewarfields.com/cnccookbook/MTMillKurtViseStop.htm

This uses a cotter dia 0.5" with a 0.25 thread. I want something a bit smaller.

I want to clamp onto a bar around 8-10mm, and i was thinking a cotter the same size (say 8mm), with a 4mm thread inside. But that means at most i can take a 2mm 'crescent' out of the side. Is that enough? (the half-inch version would have 1/8" deep).

has anyone done this? 
- thanks!
russell

ps, its for a tilting LCD monitor stand. Its a touch screen, so it needs to tilt much more than the supplied stand.

mattinker:
I'm sorry, but that's not a split cotter in the CNCcook book!

The "split cotter" described here is much better.


http://bbs.homeshopmachinist.net/archive/index.php/t-33623.html

Regards Matthew

russ57:
thanks for the link, matthew. I'm sorry, however, but i cant see the difference. In fact, the 3rd link on that page is to the same project i pointed to, and at the bottom of the page i linked to is the description taken from Lautards bedside reader that your link refers to.

http://www.cnccookbook.com/img/MillStuff/KurtViseStop/SplitCotterDrawing1-1.jpg

What have i missed? (there are variations described which i hadnt seen, ie, the cotter 'notch' doesnt necessarily need to be circular, it could be just cut at an angle; the circular notch seems to have more gripping area to me)

regards,

russell

75Plus:
Russ, You may be able to increase the crescent by off setting the cylinder in a four jaw chuck for drilling. Maybe gain .5 to .75mm.

Joe

mattinker:
My mistake, the link provided takes you to a Kurt vise stop, from what I could see, it didn't seem to be the split cotter that I've made, I didn't scroll down the page.


Regards, Matthew

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