Specifications for 2H High Speed Universal Vertical Head Drive Gear

# Thread: Specifications for 2H High Speed Universal Vertical Head Drive Gear

1. Plastic
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## Specifications for 2H High Speed Universal Vertical Head Drive Gear

I’m trying to find:
1. Diameter of drive gear.
2. Number of teeth on drive gear.
3. Diameter/thickness of spacer ring.

Thanks, Greg.

2. ## 2h drive gear for std hi speed head per John Oder from a previous post.. Thanks John!

Originally Posted by gregfortin
I’m trying to find:
1. Diameter of drive gear.
2. Number of teeth on drive gear.
3. Diameter/thickness of spacer ring.

Thanks, Greg.
Mike G. (Ramsay1) was kind enough to share the "spacing disc" diameters on his 24 and 30 tooth vertical head drive gears applicable to 2H/2CH

These are 4.025" on the oft missing 30T spindle gear, and 3.222" on the 24T installed in the head assy

Since these roll together and control gear mesh, I am going to assume these are very near the actual pitch diameters of these gears

By adding these two together, we get double the center distance = 7.247"

Making center distance close to 3.6235"

You can follow along in the math operations on page 15 in Earle Buckingham's Manual of gear Design - Section 3

Mike said he used 9DP cutter

Helix angle calcs out to 34.1134404 degrees

Lead for 30T calcs out to 18.672175".

Mike came close and used 18.626" when he set up his Low Lead box. He shows a photo in a recent thread and even specs the gears needed right from the Tables of Leads for the Model H DH

Be sure to double check the gear setup in your lead box.. I think this is the correct setup for cutting the gear in question.. Ramsay 1

3. Related thread: (at least the recent posts)

Looking for kearney &amp; trecker driver gear

As to the DOING, you have to pay attention to the HAND. If the driven (24 teeth above) is RIGHT HAND helix, the driver (30 teeth above) HAS TO BE LEFT HAND

And Greg, to answer your question on O.D., you would add two 9DP addendums to the 4.025, making a 4.2472" O.D. 30 tooth gear

Mike: If you will, check the "B" and "C" dimensions on page 4 in the link in Post #61 of the thread linked above. Have any explanation of WHY that info comes up with a THREE INCH center to center value for 2H?

j
Last edited by johnoder; 03-06-2019 at 08:55 AM.

4. Plastic
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If you are interested, I have one for sale. Sent you a PM.