worm wheel

[DalbeerSinghSoh]

hello everyone,

i hv made many reduction systems and never consider to show inovlute profile to worm gears/ spur gears cause i didnt wanted to give extra time to make those patterns and it may also decrease mobilty of model.. now i wish to know how to do it? if anyone knows how to make a perfect involute profile for worm wheel to match worm's thread plz post here i'm also looking for bevel....

Thanx and Regards

Dalbeer Singh Sohal

[DalbeerSinghSoh]

WOW no reply

[JonathanHodgson]

It sounds extremely difficult.

I've modelled true involute spur gears, using an equation curve, but I haven't yet found a way to model an true helical gear, let alone a concave worm wheel.

[KshetrabasiMaha]

Hi

Check the following link

http://www.ptc.com/company/news/inprint/articles/1999_04_84.htm

I have tried to to make a rough model(without proper dimensions)

I dont have a proper dimension of gears

If you wish I can upload the model(for reference)

Regards

K.Mahanta

[KshetrabasiMaha]

Hi

I tried to make another one

(Without proper dimensions)

I think you will like this

Regards

K.Mahanta

[DalbeerSinghSoh]

plz upload file

[KshetrabasiMaha]

Hi

This is a worm wheel for your reference

(This does not contain actual gear data)

Regards

K.Mahanta

[KshetrabasiMaha]

Hi

This is the origianl gear from the link (with some assumed dim)I have provided you earlier

(You can check this for your reference also)

Regards

K.Mahanta

[DalbeerSinghSoh]

didnt find the way to make exact inovlute profile ...

so i made this to make settlement of differences by mutual concessions.... lol

in short compermise

Video Link : 2626

[rpreliasco]

I am not a gear designer, but aren't worm teeth straight sided?

Nice animation, by the way.

[DalbeerSinghSoh]

Similar to spur gear except teeth are “concaved in”.

[Patriot_1776]

Richard, to my knowledge both the worm and ring gear need to have an involute toothform or you wouldn't even be able to assemble them. And, from what I see, there is no helical lead on Dalbeers ring gear, and there should be.

[DalbeerSinghSoh]

der is a helical lead but no ivolute toothform

i couldnt find out the way to make a perfect involute.. still trying

[JonathanHodgson]

I believe Richard is correct - the worm is effectively a hob or 'rack', so is straight-sided (although helical).

The worm wheel is involute, concave and helical...

[Patriot_1776]

I disagree. I think every gear of any sort, to avoid point loading on the tip of the tooth and excessive wear on both gears, need to have an involute tooth form.

I'm going to research this when I have time. Any takers on that bet?

[JonathanHodgson]

What diameter is the base circle of the worm (or of a rack)?