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| chipenter:
I have been making my own gear cutters for thirty years , mostly cyclodal for clocks by the pin method , this can take some time so I looked for an alturnative , using an end mill that is close to size with some adjustments , a slice of 25mm silver steel mouted on a arbour , and gashed with a 1/16" slitting saw with the bottom on centre will give a 7 degree top rake , turned anouther 3 degrees and faced off . |
| chipenter:
I use cutter zip from Marv Klots site http://www.myvirtualnetwork.com/mklotz/ ,for a 90 tooth 0.75 mod worm wheel gives pin diamiter of 10.3275mm pin centre of 11.1075mm in feed of 2.7075 a 10mm end mill was used so 0.3275 is subtracted from the pin centres , and because the top rake and the extra three degrees is no longer tangental an adjustment of the in feed is needed , dia x the COS of the angle = 0.3mm this is added to the in feed as well as half the diferance to the pin dia = in feed of 3.171 , heated to cherry red and quenched takes les the an houre . |
| PK:
Really nice work. Very interesting to see the (often ineffable) cutter geometry evolve from a sequence of operations.. |
| chipenter:
Cuts with a crisp crunchy sound and quickly , a little bit of lapping and I have a forth axis for my CNC . |
| PekkaNF:
Smart. How do you get the side clearance? Is the tooth embryo a little above the centre line or arbour inclined? Pekka |
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