44 pitch gear?

jmp · May 21, 2021

Is there such a thing? I see 32, 40 , 48 but have never seen a 44 cutter. It's a 72 tooth gear appx. 1.65" pitch dia. , 1.705" od. The teeth on a dp48 14.5 p.a. cutter look a tad undersize when placed in the gear. This gear is from a 115 year old mechanism.

Thanks

Limy Sami · May 21, 2021

Have you checked that it's not a metric - MODULE gear? .............IME it can get very confusing.

Gear Diametral Pitch, Module Conversion Table Chart | Gear Diametral Pitch | Circular Pitch | Module - Engineers Edge

Rudd · May 21, 2021

I wonder if it could possibly be a cycloidal (as opposed to involute) gear.. 115 years ago...

johnoder · May 21, 2021

Not quite Module 0.6 - using figures given its Module .585

It would have to be 1.748 OD to be 0.6 Module

L Vanice · May 21, 2021

Rudd said:
I wonder if it could possibly be a cycloidal (as opposed to involute) gear.. 115 years ago...

Cycloidal gears are used in clockwork, where a slow drive gear (spring barrel) powers a faster driven gear (Escape wheel). More to do with what works well than when the clockwork was built. It has worked well for several hundred years and still works well. The gears in the motion work can be involute because the faster gear (cannon pinion on the minute wheel arbor) drives the slower wheel (hour wheel).

Larry

jmp · May 24, 2021

The mystery continues. This was made in Menominee Michigan so probably not metric? They could have "rolled their own". I'll grind a single point cutter to do the job but was just curious.

Thanks

EPAIII · May 24, 2021

Thanks for that page. It appears to be very helpful so I bookmarked it.

Limy Sami said:
Have you checked that it's not a metric - MODULE gear? .............IME it can get very confusing.

Gear Diametral Pitch, Module Conversion Table Chart | Gear Diametral Pitch | Circular Pitch | Module - Engineers Edge

jmp · May 24, 2021

"Thanks for that page. It appears to be very helpful so I bookmarked it."

Yes I'll second that. Thank you Sami.

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44 pitch gear?

jmp

Cast Iron

Limy Sami

Diamond

Rudd

Stainless

johnoder

Diamond

L Vanice

Diamond

jmp

Cast Iron

EPAIII

Diamond

jmp

Cast Iron

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