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Post by mutley on Feb 14, 2008 15:15:02 GMT
Hi All I have been given a Sine bar and slip gauge set. I understand the theory of setting it up for a given angle but how do I then set the work piece up to this angle for machining? I don't like the idea of clamping the item to the table with the sine bar beneath it.
Andy
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Noddy
Statesman
Posts: 672
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Post by Noddy on Feb 14, 2008 16:45:44 GMT
Hi Andy
you lucky lucky b******!
I think you would use the bar to angle the work piece or table, vice etc and then fit conventional packing and clamps to take the cutting forces.
One way of avoiding clamping the sine bar into the set up would be to use the bar with a precision spirit level ON TOP of what ever you are setting up, that way you avoid any possible bending or scarring of the bar and guage blocks.
On flat jobs you could mount a straight edge paralell to one of the machine axes, and use the sine bar off this, and clamp the work piece to the machine table.
Hope this is helpful
Keith
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Noddy
Statesman
Posts: 672
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Post by Noddy on Feb 14, 2008 16:47:29 GMT
Just as an afterthought, you could also check the bar by reversing it after you have clamped your set up, to see if it is still truly paralell.
Keith
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Post by circlip on Feb 15, 2008 12:13:59 GMT
Once you've clamped the sine bar to the backing, you remove the slips and replace them with a toolmakers jack to support the bar with the job clamped on top. The bar should be hardened a tempered anyway and you won't be cleaving will you?
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Post by houstonceng on Feb 15, 2008 16:10:59 GMT
Another way is to use an adjustable angle plate (AAP). If you set the Sine-bar to the required angle by calculation and slips, you can then balance the AAP on the top - set to the protrator marks on it - but in the opposite direction (if you see what I mean) where, if set to the correct angle the top serface should be parallel to the surface that the s-bar/slips are on.
Then you "clock" the top of the AAP and adjust, as necessary, until it's parallel. Remove s-bar/slips and bolt AAP to machine. Mount work-piece on AAP and proceed.
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Post by mutley on Feb 15, 2008 21:56:31 GMT
Thanks for the help guys. Ive been doing a bit of web searching mean time and discovered you can get sine tables for clamping material to as well. Now were did I put those castings.
cheers
Andy
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