Gear cutting help needed

[aaronpadilla]

Hi there,

I need some help from experienced people in gear cutting.

I will try to rebuild my standard modern gears, they are pretty distorted, I know that I will not be able to give a good polishing to surface teeth but it just can't be worst.

I bought a cheap set of involute cutters DP16 14.5PA but looking for info I found that the smaller count of teeth for 14.5 PA is 32 without undercutting , however the cutter Nr. 1 starts to 12 teeth.

I would need a gear of 27 teeth .

I know you can't do undercutting with an involute cutter so, since the first cutter is able to cut 12 teeh, are they made to avoid interference?

 

[DAT510]

I don't have any involute cutters, but I do remember it being mentioned that many of the import cutter sets, for some reason, inverted the cutter numbers. In other words, they numbered the cutter backwards so a #1 became a #8 etc......

Looking at involute cutter tables on the web..... it looks like a cutter that cuts 12 teeth is really a #8. So it appears your set may have the inverted numbering others have found.

From the charts, for a 27 tooth, it looks like you need a #4 (real numbering) which should be a #5 in an inverted numbered set.

 

[benmychree]

Yes, correct on the reverse numbering, but all the import cutters that I have seen also have the range of the teeth to be cut stamped on the cutters.

 

[Video_man]

The imports with inverse numbering are most likely metric (module) cutters, almost certainly 20 degree PA if that is the case.

 

[benmychree]

The writer states that h

The imports with inverse numbering are most likely metric (module) cutters, almost certainly 20 degree PA if that is the case.
[/QUOTE
The writer states that the set he bought is 16 DP and 14-1/2 PA. The other countries that do the reverse number almost certainly use the same system on DP cutters as well as Module cutters.