Ready made gear vendors?

IMG_0455.JPG I Believe there all Boston steel gears have no clue what they came off ov tho.
 
I measured my gear and from my measurements it has to have a Diametrical pitch of 14 and 120 teeth.
The gear is ~8.6875 outside diameter and ~8.375 base circle. Regardless of what the Pitch Diameter is between those 2 it has to be 14 pitch.
120/8.6875 = 13.813 pitch
120/8.375 = 14.328 pitch.

Is my math correct that the gear has to be a 120 tooth 14 pitch 14.5* pressure angle (assuming that a gear made in 1946 is 14.5*)

If this is correct then I need a 127 tooth 14 pitch 14.5* pitch pressure angle matching gear to make the 120/127 combo?

In my research it seems that 14 diametrical pitch gears are basically non existent/obsolete today. If that is the case then I guess I could replace all 3 stock gears with Pitch 16 gears and add the 127 tooth pitch 16 gear.

Either that or see what a "custom" gear would cost.
 
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4gsr said:
Here's one on Amazon.

https://www.amazon.com/Boston-Gear-...qid=1493344432&sr=8-1&keywords=127+tooth+gear

I know it's not the pitch you need. They may be available from other distributors in the pitch needed.

They also have several Module pitch 127 tooth gears available, too, on Amazon.

Ken
Click to expand...

Yeah I ran across that one looking at boston gears. Unfortunately I believe you are correct in that it won't work.

dlane said:
View attachment 232324 I Believe there all Boston steel gears have no clue what they came off ov tho.
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Got any 127 tooth gears that are just tad over 9.071" across in that pile :D
 
Jmanb13 said:
I measured my gear ... pitch of 14 and 120 teeth.
The gear is ~8.6875 outside diameter and... it has to be 14 pitch.

...what a "custom" gear would cost.
Click to expand...

I've not tried this, but it might be possible to use a light-duty printed part. It has been done:

<http://www.model-engineer.co.uk/forums/postings.asp?p=2&th=115116>

If nothing else, it would verify your measurements, in case you had to get one made.
That size gear is about three pounds of steel...

Parenthetically, if you had the plastic part, it could index for cutting a steel one
 
Here is a link to Rush Gears, they do custom parts. Nice little build calculator and will show a 3-d rendering. You can enter the number of teeth, pressure angle and then play around with the pitch to see what the outside diameter will be. I didn't see any combination using 120 teeth that will have an exact outside diameter of 8.6875. You can enter the info and then ask for a quote. I haven't asked for a price on anything so I don't have a clue how expensive it is. On the plus side you can have it made in just about any material that you desire.


http://www.rushgears.com/tech-tools/part-search/build-custom-gears
 
whitmore said:
I've not tried this, but it might be possible to use a light-duty printed part. It has been done:

<http://www.model-engineer.co.uk/forums/postings.asp?p=2&th=115116>

If nothing else, it would verify your measurements, in case you had to get one made.
That size gear is about three pounds of steel...

Parenthetically, if you had the plastic part, it could index for cutting a steel one
Click to expand...

I'll look into this, I just wonder if a printed part would be strong enough. I know someone that sells 3D printers, so he might be able to just print me one up and see if it works. Worst case scenario is the printed part disintegrates and stops cutting :)

Reeltor said:
Here is a link to Rush Gears, they do custom parts. Nice little build calculator and will show a 3-d rendering. You can enter the number of teeth, pressure angle and then play around with the pitch to see what the outside diameter will be. I didn't see any combination using 120 teeth that will have an exact outside diameter of 8.6875. You can enter the info and then ask for a quote. I haven't asked for a price on anything so I don't have a clue how expensive it is. On the plus side you can have it made in just about any material that you desire.


http://www.rushgears.com/tech-tools/part-search/build-custom-gears
Click to expand...

Yeah I think that is because its a 14 pitch gear. The 16 pitch (smaller teeth) gear is 7.625" OD. The 12 pitch (bigger teeth) gear is 10.167" OD. My 14 pitch gear would fall right in between those 2. I'll check to see what/if they can make custom 14 pitch gears.
 
Get a copy of gear pitches from Machinery's Handbook or Boston Gear. cut out several profiles and see what the other gears in your gear train are. This way you will know if you need a 14,15 or 16 pitch gear.
 
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