This is still work in progress....Andrew is right. I was playing with it when assembled it....saw could be put either way, my mill/drill rotates both ways (big mill does not).
It still has two issues that are not implemented.
1: Better way to prevent nut from rotating...I was thinking of making a keyway to bushing and to arbor. Two issues here: a) Should have milled the keyway to arbor after roughing - it's made out of 42CrMo4 and sometimes that has stress. b) Collar/bushing is made out of 42CrMo4, bit tough for my standard keyway broaches. Setscrew would be a possibility, but not pretty.
2: No keyway in arbor, thinking of making two holes on face and matching pin key. Without any flat or other than chucking into collet tightening method is not that elegant.
I have three slitting saw arbors and none of them had 22 mm hole, Needed to make one more. And I failed once in 22 mm fit (wanted easy, but not sloppy fit) and then on assembly. Made it in two parts (classical model) and fit was too tight 16 mm arbor needed 5 tons to press trough, it was straight for a day, finished it and first time I used it went banana for 0,2 mm.
Instead of repeating the failure I wanted completely different arrangement....I considered Spirit Tool type arbor for MT3, but with standard M12 draw bar most of the parts would have had 2-3 mm wall thickness and some other dimensional issues (when drawn on paper on kitchen table) and I came with this solution.
Thick saws are pretty true, but one millimeter thick slitting saws seems to be wonky....do I just have a bad luck or are they all bit uneven?
How about carbide saws?
Pekka