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  #1  
Old Wed 16 July 2014, 04:22
gixi
Just call me: Marius (AVO) #32
 
Bucharest
Romania
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Mortise and tenon

Hy guys,
I know this is not made on MM but is the same thing. The reason for not using MM is because is to far from my computer ...
Here are the movies:
https://www.youtube.com/watch?v=Plm8...ature=youtu.be
https://www.youtube.com/watch?v=0qPloBCuwG8
This is the complete frame for a stool.

Have a nice day to all !
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  #2  
Old Wed 16 July 2014, 23:49
Alan_c
Just call me: Alan (#11)
 
Grabouw (Western Cape)
South Africa
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Cool!, how did you program the tenon to do the little plunge on the corners before the cut? manually or with some CAM program?
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  #3  
Old Thu 17 July 2014, 01:28
gixi
Just call me: Marius (AVO) #32
 
Bucharest
Romania
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It wasn't me... The CAM program did all the good job.
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  #4  
Old Thu 17 July 2014, 07:06
Alan_c
Just call me: Alan (#11)
 
Grabouw (Western Cape)
South Africa
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Ha Ha LOl...ok Which one?
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  #5  
Old Thu 17 July 2014, 09:51
gixi
Just call me: Marius (AVO) #32
 
Bucharest
Romania
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RhinoCam. Very good but too much for my budget...
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  #6  
Old Thu 17 July 2014, 11:06
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Hi Marius. Those first little plunges on the corners are a neat trick to prevent splintering on the remaining tips.
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  #7  
Old Fri 18 July 2014, 05:47
gixi
Just call me: Marius (AVO) #32
 
Bucharest
Romania
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If you someone need I can post the G code.
And if you look again after the corners are cut the bit starts away from any edges.
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  #8  
Old Fri 18 July 2014, 07:36
ger21
Just call me: Ger
 
Detroit, MI
United States of America
To me it looked like the plunge in the corners would cause more chipping, rather than prevent it. A climb cut that entered from the center of the side face would be a better option imo.
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  #9  
Old Fri 18 July 2014, 08:43
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
I first thought that plunge was only a way of reducing the chipload for the second (final) pass around the tenon. But then I realised that the actual wood corner experiences a small part of the tip of the cutter...effectively a lower cutting speed because of the smaller spinning radius. Maybe I have over-analysed it?
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  #10  
Old Fri 18 July 2014, 09:59
bradm
Just call me: Brad #10
 
Somerville(MA)
United States of America
It looks to me like it plunges at the bit radius distance away from the corner with the center right on the entry edge, and then moves clockwise diagonal to the bit radius distance away from the corner centered on the exit edge. After the fourth corner, it plunges at the bit diameter distance away from the first corner on the exit edge, and cuts clockwise to rise at that same point.

I think it both minimizes the chipload, and eliminates pushing sideways against any unsupported wood grains, which is what would happen for the last 2/3 or so of each corner were it unrelieved.
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  #11  
Old Fri 25 July 2014, 03:22
Robert M
Just call me: Robert
 
Lac-Brome, Qc
Canada
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Out of curiosity....what's your holding method, jig for those mortise & tenon ?!
Any pics ??
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