![[The Talking Machine Forum - For All Antique Phonographs & Recordings]](/styles/we_universal/theme/images/the_talking_machine_forum.png)
Hiya folks,
Just for clarity and posterity, I've measured the drive pulleys and feedscrews for both my "early" Q and my "late" Q. As I indicated in the post I linked above, the geartrains remained unchanged between the two versions of Qs I examined.
The following are their respective dimensions (early ----> late).
Pulleys:
0.827" ----> 1.077"
Feedscrews:
5/16-48(?) ----> 5/16-40 (My thread gauges don't go smaller than 40 TPI - so I consulted my Machinists Handbook to guess at the next finer thread possibility.)
I'd be very interested in others' results.
Best,
Fran
Brown wax records and early Columbia machines
-
fran604g
- Victor VI
- Posts: 3988
- Joined: Mon Mar 04, 2013 2:22 pm
- Personal Text: I'm Feeling Cranky
- Location: Hemlock, NY
Re: Brown wax records and early Columbia machines
Francis; "i" for him, "e" for her
"Even a blind squirrel finds a nut once in a while" - the unappreciative supervisor.
"Even a blind squirrel finds a nut once in a while" - the unappreciative supervisor.
-
phonogfp
- Victor Monarch Special
- Posts: 7400
- Joined: Wed Jan 07, 2009 5:08 pm
- Personal Text: "If you look for the bad in people expecting to find it, you surely will." - A. Lincoln
- Location: New York's Finger Lakes
Re: Brown wax records and early Columbia machines
Thanks for the correction, Fran!
I clearly "misspoke" ("mistyped?") when I wrote that Q feedscrews are 100 tpi. It's the records that are 100 tpi. Whether the feedscrew is a fine one found on Edison Triumphs, or a coarse one supplied with an Edison Standard, or 40 tpi as seen on the Q, the mathematical combination of gear teeth, pulley diameter, and feedscrew pitch must equal 100 tpi for most pre-1908 phonographs.
George P.
I clearly "misspoke" ("mistyped?") when I wrote that Q feedscrews are 100 tpi. It's the records that are 100 tpi. Whether the feedscrew is a fine one found on Edison Triumphs, or a coarse one supplied with an Edison Standard, or 40 tpi as seen on the Q, the mathematical combination of gear teeth, pulley diameter, and feedscrew pitch must equal 100 tpi for most pre-1908 phonographs.
George P.