Spur Gears for a Clausin model 3914

[ElectronMini]

I am trying to see what type of gears are utlizied in my 7"x36' old Clausing.
Took off and cleaned a 75 Teeth on the shaft to the QC gearbox and cannot figure out the DP the use. The OD of the gear is 122.2 mm and 75 teeth.
I looked at the Machinery's Handbook 11 edition (1930, $5 in garage sale) and by working backward reading page 619 of : Standard Full-depth Teeth I get the following:

Assume DP of 14;16;17;18 and using OD= (Number of teeth + 2) / Circular Pitch I get an approximate value for OD of the gear of:

DP CP (") OD of gear
___ ________ ___________
14 0.2224 ((75+2)*0.2224")/3.1416 = 138.5 mm (note that I mislead the issue a little bit because I converted the 0.2224 inches to mm while doing the formula
16. 0.1963. ((75+2)*0.1963")/3.1416 = 122.3 mm **********************
17 0.1848 ((75+2)*0.1846")/3.1416 = 124.9 mm
18 0.1745 ((75+2)*0.1745")/3.1416.= 114.9 mm

I guess I could assume that the DP of these gears is 16 and then proceed with that to calculate the other two gears I will be for metric conversion.

Can someone confirm my assumption?
Thanks.

[oxford]

No help with your gear but I think your Clausing model number, size, or both may be wrong in the title and post.

What are you looking to do with the gear info? Replaced damaged ones? Metric threading?

[rjs44032]

The gear is most likely 16DP. Calculation is as follows N+2 / DP = OD Where N = number of teeth.

In this case 75+2 / 16 = 4.8125" (122.2375mm)


Or DP = N+2 / OD

In this case 75+2 / 4.811"(122.2mm) = 16.005 DP


I think you need to do a conversion to imperial values before calculating DP. Hope this helps.


Best Regards,
Bob

[Doozer]

Why are you converting everything to metric ?
Are you trying to use modular gears for some reason.?

-D

[ElectronMini]

No help with your gear but I think your Clausing model number, size, or both may be wrong in the title and post.

What are you looking to do with the gear info? Replaced damaged ones? Metric threading?

Trying to see if I can make a couple of gears to get metric threads that is most of what it comes nowadays on every piece of equipment/car.
Let me go and check, because maybe I transpose numbers from the garage to the laptop trip

You are right: It says 5914, Sorry for the error.

[ElectronMini]

Why are you converting everything to metric ?
Are you trying to use modular gears for some reason.?

-D

Just trying to get metric capability since sometimes I can make/using a bigger one in less time I can go and buy it.
Also planning towards an aluminum melting furnace with propane and build the little shaper from Gingery
I built the lathe and milling machine of his books 35 years ago probably. Gave them to a friend when I moved. Lost also the furnace on moves.

[oxford]

If you search Clausing 5914 metric threading gears you will probably find the info you need. There were/are conversations out there for them. If I remember correctly you may need more than just the gears to get it to work.

[ElectronMini]

The gear is most likely 16DP. Calculation is as follows N+2 / DP = OD Where N = number of teeth.

In this case 75+2 / 16 = 4.8125" (122.2375mm)


Or DP = N+2 / OD

In this case 75+2 / 4.811"(122.2mm) = 16.005 DP


I think you need to do a conversion to imperial values before calculating DP. Hope this helps.


Best Regards,
Bob

Yea, I have been doing with the calculator as I progressed with the formula but did not write it down before I posted. But I did converted the Inches of the CP to metric since I prefer to work with the metric system if I can. The result was a number without units anyhow since it is just a ratio. Poor presentation of my parte, but I came t the same conclusion you did working backwards
Thanks for taking the time, for a while as was making mistakes with the calculator and I thought it was some other kind of gear. I also messed up the lathe model number since it is really 5914 model, but I read the stamped 5 as a 3 in the dark (cold in the garage here in Round Rock - Texas