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Tooth cutter indexer

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Steviegtr12/10/2020 23:21:08
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1636 forum posts
196 photos

Thought some of you tech guys might like this video. This chap . The shed dweller is making an indexing device to cut any gear from 0 to 100 teeth. Do i understand it all. Er not quite. If i was still working then this would be well above my pay grade. My main reason for watching is i am enjoying watching all his machining techniques. A Johny 5 moment.

Gear cutting indexer

Steve.

Brian Wood14/10/2020 09:43:15
2287 forum posts
37 photos

Steve,

Thank you for posting this.

I watched the video with interest but was left with several questions the man didn't address.

One of these is the use of a dowel pin to be placed in one of two holes at the bottom of the device, after which a quadrant [made in brass for some reason] was moved into contact and locked. It wasn't clear what this achieved or why it was considered necessary.

The radius arm that rotated the fixture was anchored back to a firm mounting to the side of the shaper, but no allowance was made for the errors introduced from the arrangement; a form of Watts parallel linkage was surely essential.

He spent a lot of time showing how the device was machined but the critical details on it's working were skimmed over too briefly to follow.

Intriguing but it left too much unsaid and in the final closing words we were told there were inaccuracies arising from the lack of bushes at the ends of the radius arm as if that explained away a fundamental design fault

Regards Brian.

IanT14/10/2020 13:07:03
1669 forum posts
161 photos

I thought it was very interesting Steve and potentially a useful step forward from the Base Circle 'wire' method.

He's added a second video about subsequent changes to the device. Whether the design is theoretically perfect or not - I don't know (above my pay grade) but it seems to work for him. However, he's taken a good step forward and I'd certainly consider this approach if I ever get around to trying shaper-cut gears.

Simply formed cutters are one of the shapers great benefits and this is a very good example of that advantage.

Regards,

Ian T

Edited By IanT on 14/10/2020 13:08:09

Steviegtr14/10/2020 15:30:56
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1636 forum posts
196 photos

Well i went back over the video. Ended up asking him about the tapping device he was using on the lathe. Quite intriguing to watch it snap away from the thread as it got to it limit of needed cut. He has done a video on making that so i will maybe have a looksee tonight.

Steve.

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