Help Identifying Change Gears

texasgeartrain

Titanium

Joined

Feb 23, 2016

Location

Houston, TX

• Jan 2, 2022

• #1

I know close to zero about change gears in general.

I won a lot of tooling that was supposed to be a for 13" Monarch Series 61, listed as a 15x54. The actual machine listing:
15.5" x 54" Monarch Model 13" Engine Lathe, new 1957, 15.5" swing over bed, 54" ctrs, 16 spindle

The tooling listing:
https://www.bidspotter.com/en-us/au...0033/lot-94fb1723-a247-4c2a-889c-ade90158c275

In the tooling listing was also a 10ee turret tail stock . . . And in talking to the auction house they had no real way of 100% knowing which tools to which machine exactly. They received the contents of a machine shop boxed and crated, with anyone who might have known long gone.

In this tooling I got a set of change gears. No manufacture name that I have found. Some part numbers though.



Also stamped in the wood frame "127 M-1694 English to metric":



Also a pic of the gears with their "piece number" on them:



Any help appreciated.

 

johnoder

Diamond

Joined

Jul 16, 2004

Location

Houston, TX USA

• Jan 2, 2022

• #2

Just for comparing here is a Monarch chart - which Monarch I have no idea

 

JST

Diamond

Joined

Jun 16, 2001

Location

St Louis

• Jan 2, 2022

• #3

What it is "for", is not too important. Tooth counts, DP, thickness, and shaft bore size will determine if they can be used with your machine.

 

rivett608

Diamond

Joined

Oct 25, 2002

Location

Kansas City, Mo.

• Jan 2, 2022

• #4

Take a look at this thread, the 9th response has lots of photos and they show a Pratt & Whitney dividing head, the box is very similar, same construction, paint color, stamps, and mine has a blue print label like yours. I am guessing they go to something made by P & W in the 1940s.

https://www.practicalmachinist.com/...8-p-w-3c-mill-319932/?highlight=dividing+head

 

W

wdTom

Aluminum

Joined

Jan 21, 2005

Location

Rhode Island

• Jan 3, 2022

• #5

The 127 tooth gear along with a 100 or 50 would be used to convert it to cut metric threads.

 

johnoder

Diamond

Joined

Jul 16, 2004

Location

Houston, TX USA

• Jan 19, 2022

• #6

127 M-1694 English to metric

Click to expand...

M-1694 is 12" Model C lathe

 

texasgeartrain

Titanium

Joined

Feb 23, 2016

Location

Houston, TX

• Jan 19, 2022

• #7

johnoder said:

M-1694 is 12" Model C lathe

Click to expand...

That's a great find, thanks John.

I had posted a quick something here and saw John's reply:
Metric threading on a late Pacemaker?

After John's reply I found this Pratt and Whitney 12" Model C manual. I don't see mention of how 1694 applies, but all the pages of the book are referenced as 1694:
https://ia601004.us.archive.org/34/items/lathe-manuals/Pratt whitney 12 inch model-C lathe.pdf

 

johnoder

Diamond

Joined

Jul 16, 2004

Location

Houston, TX USA

• Jan 19, 2022

• #8

I don't see mention of how 1694 applies

Click to expand...

Just a number for that particular product. 14 and 16 used M-1696.

Older products had smaller M numbers

At the very least, it gave the bean counters an "account number" to charge expenditures to

In biz 79 years in Hartford (CT) and then 52 more years in West Hartford

 

Last edited: Jan 20, 2022

H

Hobby Shop

Stainless

Joined

Mar 20, 2014

Location

Michigan

• Jan 20, 2022

• #9

Page one and three in the Model C parts manual shows the numbers under each lathe John is referring to. I’d be all over that trade if those change gears were for the 16”.

Pratt & Whitney Co. - Publication Reprints - P&W Model C Parts Manual | VintageMachinery.org

 

johnoder

Diamond

Joined

Jul 16, 2004

Location

Houston, TX USA

• Jan 20, 2022

• #10

Chart in manual. May not be exact for 12 since it is in a 14 - 16" pub. Way better than nothing to accompany your set of gears



This can be emailed if you would like to PM me that address

 

texasgeartrain

Titanium

Joined

Feb 23, 2016

Location

Houston, TX

• Jan 20, 2022

• #11

You guys rock ! From the link Hobby Shop posted:



Funny coincidences, chatting in the Heavy Iron section over the past couple weeks about Pacemakers, and in various conversations, a member's shop came up, then in a pm he actually mentioned his Pratt & Whitney 12C.

Fast forward a couple of weeks, and John ID's the change gears. You can see his 12" model C here, the last pic:
My 10EE and some shop pictures

He's got quite the shop going in, if you check the pics in that thread. I borrowed the P & W pic from there to post here:



I contacted him to inquire, he does not have change gears already. So I'll be shipping these to him. A real nice rebuilt lathe as well. Its fortunate the gears will going into the right hands.

Appreciate all the help guys, and John, I'll pm you with email. I'll print that and ship with the gears.

Thanks all.