Making Gears.

[ChubbsParticipant @chubbs]

[ChubbsParticipant @chubbs]

Hi all.

I am thinking about making some gears for a Boxford Lathe, but at the mo i am trying to get my head around working out the gear blank size. (never any good in maths).       For a gear with 55 teeth.

As i see it ,from what i have read up on,   55 teeth  + 2  over  18 D P  gives me 3.17    , is this fig 3″  &  170 thou   the dia of the blank ??

 

    thanks for any input .                       Chubbs.

 

  

[JasonBModerator @jasonb]

3.166666 is the OD of the gear

[_Paul_Participant @_paul_]

I have been using this http://www.forestmoon.com/software/GearDXF/

 

Regards

 

Paul

[Sub MandrelParticipant @submandrel]

Hi Chubbs

 

In short, yes, but don’t round to 3.17, ropund to the nearest thou – 3.167, three thou large on the blank is enough to make the the teeth a little large. A touch undersize is fairly harmless.

 

Neil

[ChubbsParticipant @chubbs]

Hi lads.

Thanks for the replys,  &   Stubs o k  about being more accurate will do.

Also i did click on the FORRESTMOON that Paul posted and that seemed the dogs ———  but 5 mins later my P C went tits up from a corrupt file now weather it was the forrest file or not i dont know ???. Can anyone shed any light on that ????

So i am a bit afraid to go back to that again.

 

                           Thanks again                       Chubbs.

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