Cutting clock gears with thin slitting saws is very promising but the segmentation is hard to optimize. Too high a segmentation impacts cutting time badly. Here is a closeup with segmentation of 8
showing ridges that will impact friction of a gearpair.
How about adding another machining process for each tooth flank that has the cutter positioned, in X, on the middle of the edge of the wheel and does a Y move into the root generating the tooth face by coordinated motion of Z and A with the Y infeed?
If a low feed rate can be called up for this then a very smooth tooth can be made with little impact on the total cutting time.
This would produce a dished face in the dedendum but for thin gears and a reasonable saw diameter this would not be objectionable. If one wanted to avoid the dish for cosmetic reasons say when cutting a small stack of gears, then the Y-depth could just kiss the root in the middle as the tooth flanks are probably flat in this area.
John Prentice
Slitting saw cutting
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Slitting saw cutting
Last edited by japrenticeuk on Thu Aug 13, 2015 4:43 am, edited 1 time in total.
Re: Slitting saw cutting
Hi John:
I see what you mean. Were these done with the "Maintain depth" option on do you know? ( Just curious.). I had thought
maintaining depth on the slit saw would help keep make the tip of the blade have less of a stepping effect on the result,
but had never confirmed it.
I think its quite possible what you suggest would clean up the cut marks, depending on saw diameter and thickness of
the blank. Im willing to look into adding that , doesnt sound all that difificult in the end. It will be the fall before I get to it,
but consider it onthe fix-up list rather than a feature request.
Thx for the photos, they really help to show an issue.
Art
I see what you mean. Were these done with the "Maintain depth" option on do you know? ( Just curious.). I had thought
maintaining depth on the slit saw would help keep make the tip of the blade have less of a stepping effect on the result,
but had never confirmed it.
I think its quite possible what you suggest would clean up the cut marks, depending on saw diameter and thickness of
the blank. Im willing to look into adding that , doesnt sound all that difificult in the end. It will be the fall before I get to it,
but consider it onthe fix-up list rather than a feature request.
Thx for the photos, they really help to show an issue.
Art
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