wormwheel module 1.33

[nercor]

hello,

i have to make a wormwheel module 1.33 but i do not have a hob for this.
i got a module 1.25, my question is can i do something so the pitch will be that of module 1.33?

thank you in advance,
cheers!

 

[spigor]

Will you also be cutting the worm? If so, it could be possible to adopt the worm's data to match your existing hob.

 

[drawoh]

nercor,

You need tools to cut economically worm gears. If the hob is for module[ ]1.25, it cuts module[ ]1.25 gears. If you assemble your gears loosely, it might work, but this is an awful solution.

How did you wind up with module[ ]1.33?

--
JHG

 

[nercor]

*Spigor thanks for the reply, i'll be doing only the wormwheel.
*Drawoh, i think the original gear is DP's and not metrics; so when i measured the pitch it's something ca.1.33.
i googled DP's equivalent to metric and DP19 is like 1.337.

thanks

 

[drawoh]

nercor,

I thought that might be the case. You can get 20DP gears but notg 19DP. Do you have specifications, or are you measuring this thing?

--
JHG

 

[nercor]

drawoh,
i measured the pitch with a calipher.

 

[drawoh]

nercor,

That is not a good method. If you have an even number of teeth, you can measure the OD and count teeth. Read up on gear addendums. You should be able to guess at the tooth size (20DP?) and work out a pitch diameter. If you have an odd number of teeth, read up on measuring between pins.

--
JHG

 

[spigor]

How about checking your hob with sample worm wheel to see how they mesh?

 

[nercor]

Guys, thank you very much for the advices.