worm gear

[Metco]

hi all
i have no experince in this field so i neeed some advice
i got NLX2000 DMG mori with Y axis also
i neeed to cut a worm gear like in picture below
the gear is standard MESHING GEAR P001-110
MODULE 1
PRESSURE ANG. 20°
NO. TEETH 20
NO. STARTS 2
LEAD ANG. 7°11'
HELIX DIRECTION RH
PITCH DIA. (C) 20.16
THROAT DIA. (D) 22.00
OUTSIDE DIA. (D') 23.00
ADDENDUM 0.92
TOOTH DEPTH 2.25

the question is would i be able to generate a path with lathe to cut this type of gear? if I manage to find a disk cutter with the shape of the profile?

[George Woyansky]

hi all
i have no experince in this field so i neeed some advice
i got NLX2000 DMG mori with Y axis also
i neeed to cut a worm gear like in picture below
the gear is standard MESHING GEAR P001-110
MODULE 1
PRESSURE ANG. 20°
NO. TEETH 20
NO. STARTS 2
LEAD ANG. 7°11'
HELIX DIRECTION RH
PITCH DIA. (C) 20.16
THROAT DIA. (D) 22.00
OUTSIDE DIA. (D') 23.00
ADDENDUM 0.92
TOOTH DEPTH 2.25

the question is would i be able to generate a path with lathe to cut this type of gear? if I manage to find a disk cutter with the shape of the profile?

As long as you're able to move the machine in the Y-Z-C axes all at once, the answer is yes. If you're getting a form cutter made, I'd make it slightly smaller in diameter than the "slot" width so you can climb cut each face of the tooth instead of trying to cut both faces at once and having one face being machined conventionally while the other is being machined with climb cutting. I'd also make sure to slice the part so you're perpendicular to the tooth face, I.E. at the helix angle of the tooth face and not parallel to the XY plane (as your image currently shows) and create your cutter geometry from that angled slice.

[Metco]

As long as you're able to move the machine in the Y-Z-C axes all at once, the answer is yes. If you're getting a form cutter made, I'd make it slightly smaller in diameter than the "slot" width so you can climb cut each face of the tooth instead of trying to cut both faces at once and having one face being machined conventionally while the other is being machined with climb cutting. I'd also make sure to slice the part so you're perpendicular to the tooth face, I.E. at the helix angle of the tooth face and not parallel to the XY plane (as your image currently shows) and create your cutter geometry from that angled slice.

thanks for a ton of info
1. i dont know what you mean slice the part ? the lathe can do YZand C all the same time as we have 5 axis module..
2. I have rotated the part so the middle of the line in the center of the grove would be parallel to the Y direction..
how i got the file was like this photo below..
(if i give you the part would you be able to generate a path for me so i can have a look?) i am afraid i have no clue what i am doing..
let me know and i will attach it.

i should also say this is standard worm gear BG1-20R2 so i think we can find a wheel cutter that can cut it so we can buy off the shelf but i am not sure where to start looking.


regards Goerge.

[George Woyansky]

thanks for a ton of info
1. i dont know what you mean slice the part ? the lathe can do YZand C all the same time as we have 5 axis module..
2. I have rotated the part so the middle of the line in the center of the grove would be parallel to the Y direction..
how i got the file was like this photo below..
(if i give you the part would you be able to generate a path for me so i can have a look?) i am afraid i have no clue what i am doing..
let me know and i will attach it.

i should also say this is standard worm gear BG1-20R2 so i think we can find a wheel cutter that can cut it so we can buy off the shelf but i am not sure where to start looking.


regards Goerge.

If you can attach it that would be good.

What I mean by about rotating is to rotate it by 7 degrees 11 minutes so you are looking straight down the tooth profile.

[Metco]

If you can attach it that would be good.

What I mean by about rotating is to rotate it by 7 degrees 11 minutes so you are looking straight down the tooth profile.

attached file Goerge..hope its not too complicated.
the latest GC V and V12 attached

[George Woyansky]

attached file Goerge..hope its not too complicated.
the latest GC V and V12 attached

Take a look at this and see if it helps... There are some notes in the file along with a couple new CSs. Saved as V14

[Metco]

Take a look at this and see if it helps... There are some notes in the file along with a couple new CSs. Saved as V14

thank you for your help
i am going to make 1k parts so defnetly going to make a arbor key cutter to machine this profile
however
would a normal lathe with XYand Z and C working togther would generate the tool path?
where do you guys buy gear cutters like this?
and how would i know how to make this key cutter if i dont know how to generate the path..
I am not 100% sure how the key cutter is going to make this profile wiuth XYZ and C working together?
what strategy would you use?

[George Woyansky]

thank you for your help
i am going to make 1k parts so defnetly going to make a arbor key cutter to machine this profile
however
would a normal lathe with XYand Z and C working togther would generate the tool path?
where do you guys buy gear cutters like this?
and how would i know how to make this key cutter if i dont know how to generate the path..
I am not 100% sure how the key cutter is going to make this profile wiuth XYZ and C working together?
what strategy would you use?

The shape you're looking to do is pretty involved - here's an example of how to do it on an NLX machine. Your application would be similar but the hobbing tool would have to be mounted at a 7° 11' angle relative to the axis of the spindle in order to generate a helical worm wheel. It also depends on the class of gear you're trying to machine - you might be able to get away with a form cutter if the gear class has enough tolerance. If not, you might be better off finding someone with a gear hob machine who cuts gears for a living. In addition to just machining it, you have the headache of trying to inspect it and make sure that the tools aren't worn.

https://www.youtube.com/watch?v=Ou14Oog0E5o&ab_channel=WTOtoolholders

[Metco]

ok thanks
i think its standrad worm gear..so if i ever find a disk cutter that profile shape of the worm gear would that not do? and would it be enogh to do the profile ?asuming i have a disk cutter with the shape of profie?>

[George Woyansky]

ok thanks
i think its standrad worm gear..so if i ever find a disk cutter that profile shape of the worm gear would that not do? and would it be enogh to do the profile ?asuming i have a disk cutter with the shape of profie?>

You would still need to tilt the axis of the cutter by 7° 11". On a mill-turn this would end up being a B-axis rotation so that the cutter is not horizontal when you look at the machine from the front - it needs to be at a slight incline. You would make a circular-ish cut in the YZ plane, then rotate C to the next tooth and repeat.

[guidoc]

power skiving and gear hobbing always breaks my brain.

[BrandonL]

power skiving and gear hobbing always breaks my brain.

+1 same here