How did you set it up ?
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Mastiff lc mason engine REDO .
- Thread starter minh-thanh
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It's simple, Just set a 45 (30, 60 ) degree angle between the workpiece and the cutter on the lathe or milling machine
Jens Eirik Skogstad
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To select right counts of teeth gear wheel cutter to cut helical gear: Zh=z÷COS³
The same counts of gear teeth in the gear cutter can't cut the helical gear with same counts of gear teeths due angled teeth's has difference profile.
The same counts of gear teeth in the gear cutter can't cut the helical gear with same counts of gear teeths due angled teeth's has difference profile.
That might work but unless you use a method like the Chuck Fellows fixture or another method that rotates the gear against the cutter, you will not get a constant depth gear tooth
Here's a bit of the information Chuck posted.
Above post with Chuck's explanation is correct. That's why I bought the gears I wanted. You must rotate the workpiece through the cut, so needs a geared drive to do that. And special milling cutters for the "COS" factor to get the correct tooth gap. It's why these are so expensive to buy! (And hard to find!)
K2
K2
For general milling of the helical gears, the cutter isn't that big of a problem, according to Colvin and Stanley's Gear Cutting Practice book, there is a chart, Fig 77, p120 for how to select the appropriate B&S system cutter number.
"Colvin and Stanley's Gear Cutting Practice".
https://archive.org/details/in.ernet.dli.2015.211966
Now that sounds like a good bedtime read...
But I struggle with a lot of maths. (Complex numbers etc.). Hope this one sticks to plain Trig,
K2
https://archive.org/details/in.ernet.dli.2015.211966
Now that sounds like a good bedtime read...
But I struggle with a lot of maths. (Complex numbers etc.). Hope this one sticks to plain Trig,
K2
Nothing too difficult here?
With all due respect, if you are commercially hobbing helical gears, that math is required, if you are milling the gears for low power, low usage gears, the chart I posted will get you where you need to be.
Thanks for the comments
As Chuck Fellows said : "but I the gears that I have made mate and work flawlessly"
And ....
I am aiming for smooth operation . "not commercial"
If you have seen those 2 gears they have angles of 30 and 60 degrees and I am having trouble with angle settings for the tool
I would like to ask if it is possible to change all of them to 45 degrees ? -- Of course when changing I need to recalculate the parameters ... of the gears
As Chuck Fellows said : "but I the gears that I have made mate and work flawlessly"
And ....
I am aiming for smooth operation . "not commercial"
If you have seen those 2 gears they have angles of 30 and 60 degrees and I am having trouble with angle settings for the tool
I would like to ask if it is possible to change all of them to 45 degrees ? -- Of course when changing I need to recalculate the parameters ... of the gears
Without knowing more about what they do, probably not.
The 30/60 (approximate) gear ratio gives you the 2:1 speed ratio for gears that have the same diameter.
If you go with 45 degree gears, then for a 2:1 speed ratio, you would need one gear with twice the number of teeth as the other one.
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If you go with 45 degree gears, then for a 2:1 speed ratio, you would need one gear with twice the number of teeth as the other one.
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Jens Eirik Skogstad
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30/60 gear give less load on gear than 45/45 gear due "worm gear" properties who give smooth running between gears.
Lots of good advice here, THANKYOU all.
K2
K2
That would be correct for a right angle drive because a 60° helical/worm has more axial load than a 30 or 45° and will work if the 60° is the drive gear/worm.
Jens Eirik Skogstad
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Yes exactly what I mentioned..
Jens Eirik Skogstad
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See here what I make own helical gear with homemade milling machine.
Thanks for the comments 
Hi All
Another test before I buy the material to make the lathe slide extension and the 30 and 60 degree dividers for cutting gears
Another test before I buy the material to make the lathe slide extension and the 30 and 60 degree dividers for cutting gears
Nice! Do you have a picture of the setup you used?
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