I joined up here cos I was directed to view some work done on this topic last year by https://bbs.homeshopmachinist.net/fo...po-boy-hobbing
and https://bbs.homeshopmachinist.net/me...176-davidwdyer
I dont wish to be seen as hijacking his thread or over topping his work. I sent him a pm but sadly no reply
There were many other commentators on his post and perhaps those with an open mind would support my re-opening of this topic for discussion following my own similar path of work
Hopefully the OP may resurface and help share experiences with you all
Despite the skeptical views from Gear purists I believe this method has a place but I readily admit it has limitations
Pros
a) Cheap and quick to produce vs laborious dividing head method
b) No special $$$ equipment needed
c) DIY hobbing tools for a few dollars
Cons
a) Only for light duty using non ferrous mtl - not intended for power xmission or precision use
b) Does not produce standard DP conforms so may not mesh with std gears
c) Gives a 30deg PA
d) Is thought to be unpredictable re number of teeth vs design (I hope to show this is not necessarily the case)
e) May well be difficult to fit defined centers (but could drill centers afterwards or just adjust profile shift)
f) For the moment limited to 3mm CP but work in hand for larger values possible
The method must be seen as an agricultural approach that can and does produce meshing gears so typical criticisms by gear theorists (as experienced by the OP) are really not appropriate for this method and should be regarded as OT
obtw i forgot
https://bbs.homeshopmachinist.net/fo...-to-long/page5
an intriguing method I havent tried myself
and https://bbs.homeshopmachinist.net/me...176-davidwdyer
I dont wish to be seen as hijacking his thread or over topping his work. I sent him a pm but sadly no reply
There were many other commentators on his post and perhaps those with an open mind would support my re-opening of this topic for discussion following my own similar path of work
Hopefully the OP may resurface and help share experiences with you all
Despite the skeptical views from Gear purists I believe this method has a place but I readily admit it has limitations
Pros
a) Cheap and quick to produce vs laborious dividing head method
b) No special $$$ equipment needed
c) DIY hobbing tools for a few dollars
Cons
a) Only for light duty using non ferrous mtl - not intended for power xmission or precision use
b) Does not produce standard DP conforms so may not mesh with std gears
c) Gives a 30deg PA
d) Is thought to be unpredictable re number of teeth vs design (I hope to show this is not necessarily the case)
e) May well be difficult to fit defined centers (but could drill centers afterwards or just adjust profile shift)
f) For the moment limited to 3mm CP but work in hand for larger values possible
The method must be seen as an agricultural approach that can and does produce meshing gears so typical criticisms by gear theorists (as experienced by the OP) are really not appropriate for this method and should be regarded as OT
obtw i forgot
https://bbs.homeshopmachinist.net/fo...-to-long/page5
an intriguing method I havent tried myself
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