Gallery, Projects and General > How to's
Square Bolts
NickG:
If you're careful you should manage in the 4 jaw I reckon. I never thogught of er collets, I needed to turn some square the other day, as you say, it's not gripping on much then though.
Nick
Jasonb:
Interesting the sizes you came up with Marv as a standard M3 hex nut is 5.5mm AF, for ease of production 5mm may be the best option as square is avalible in that size.
What did you make the bush from? I find alloy teh best as being softer it grips the steel better. Rather than cut in half make 3 saw cuts equally spaced, one right through and the other two stopping just short of teh bore. This will require less chuck force to close down onto teh work.
A 5C square collet would be the ideal tool for the job.
Jason
Gerhard Olivier:
Jason I made the bush by cutting a bit of brass in middle then cut 90degee grooves in both and put the 2 together it has a square hole- nicely centred!!! I think the cold rold stuf is just to hard for such small diameters????
Im leaning toward buying thread bar and just making nuts -and forget the nut and bolt idea!!!
Gerhard
Jasonb:
Buy some decent leaded bright mild steel, it will cut like butter or just free cutting steel like EN1A, most of the model engineering suppliers will have this in imperial sizes, 3/16" should be about OK on M3
Also studding is not an ideal fixing, if you do got that route then just cut a thread onto then ends of some 3mm round bar. You can then either just have a nut on either end or run a nut onto the thread, silversolder it on and then back in the lateh to take a skim off the "bolt" head.
And the easy way out http://www.modellbauschrauben.de/shop_detail.php?gruppid=38
mklotz:
This site...
http://www.engineersedge.com/square_nut.htm
may be helpful. Note that for bolts >= 0.75 diameter, the nut is 1.5 times diameter. Also note that for the larger nuts, the thickness approximates 0.9 of the diameter.
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