bad 4 jaw

[Cogsy]

You'll get so good at dialling in on the 4 jaw you wont need a 3 jaw (unless you need to machine hex stock). The first time I mounted my 4 jaw I didn't take it off for 6 months, but now I'm lazy and my 3 jaw does most of my work.

 

[mcostello]

You mean You cannot use a 4 jaw for Hex stock? Must be doing something wrong.

 

[john_reese]

oh yes but it will require making every one of them. i wont trust this chuck the way it is. . ive ordered and recieved a 4 inch 4 jaw from little machine shop . i just broke down and got a good one. my 3 jaw is 0.27 off and ive screwed it up now by trying to grind it true. so is flippin usless now too.

It was practical to make new screws for a 12" steel body chuck. For a 4" cast iron (import) chuck it is not worth the investment in time.

 

[Cogsy]

You mean You cannot use a 4 jaw for Hex stock? Must be doing something wrong.

You're right, I don't know what I was thinking. Perhaps it was a triangular part that forced me to change chucks once, I can't remember, but I do know I couldn't use the 4 jaw (or perhaps I just screwed up ).

 

[Nick Hulme]

It was practical to make new screws for a 12" steel body chuck. For a 4" cast iron (import) chuck it is not worth the investment in time.

The 4" Pratt-Burnerd which came with my Super 7 had half the square socket broken off on top of one screw, but they used UNC screws so a trip to the bolt shop and I had 4 new, rather chunky grub screws with nice new hex sockets, the correct thread and length, and which just needed a slot in the right place to drive the jaws. I can't see why they need to make small 4 jaw chucks more complex than that

 

[goldstar31]

The 4" Pratt-Burnerd which came with my Super 7 had half the square socket broken off on top of one screw, but they used UNC screws so a trip to the bolt shop and I had 4 new, rather chunky grub screws with nice new hex sockets, the correct thread and length, and which just needed a slot in the right place to drive the jaws. I can't see why they need to make small 4 jaw chucks more complex than that [/QUOTE


My Myford Super7 B( Burnerd) 6" independent also had broken screws when I bought it.

Probably caused by trying to push work along with two opposing screws firmly locked. The Two Bees Syndrome- Brute Force and Bloody Ignorance.

One day I'll braze them but with care they still work.

2 years ago at the Ally Pally, I got a 4 jaw self centring chuck for the two Myford machines thought that if care was not taken that it would also be a possible candidate if non concentric or non square materials were being held.

 

[itowbig]

You'll get so good at dialling in on the 4 jaw you wont need a 3 jaw (unless you need to machine hex stock). The first time I mounted my 4 jaw I didn't take it off for 6 months, but now I'm lazy and my 3 jaw does most of my work.

Yes i do like the 4 jaw much better, but it will take me a bit to get used to quickly setting it up. Im pretty happy with the new 4 jaw . I got the 4 inch with the back plate. it takes up a lil more room , but im happy with it.

 

[itowbig]

It was practical to make new screws for a 12" steel body chuck. For a 4" cast iron (import) chuck it is not worth the investment in time.

i agree completly. ill find another use for it some day. for now it sits in the scap box.