Seneca Falls change gear question ?

J

jpackard56

H-M Supporter - Diamond Member
H-M Lifetime Diamond Member
Joined
May 22, 2019
Messages
185
Does anybody have or know where can I find the gear combinations for a Seneca Falls 9 x 4ft (Star #20 I think)?
The last patent date of six showing is Nov 14 16. The number on the way is # *916801
It does not have any threading plate or chart on it (if it ever did)
The gears I have are 3/4 bore keyed and 9/16 wide. Very good chance I don't have the correct ones to do a 12-thread per inch.
That will be my search after I find the correct combination.... Thanks,
Jim
 
Back in shop, very cold out here about 15° f
By my shaking hand holding thread gauge the lead screw is 12 threads per inch
 
You should be able to use a chart for most any other lathe, and divide by the difference in ratio between its lead screw and yours. In the case of the 12TPI that you want to cut, the ratio of gearing between the spindle and lead screw should be 1:1.
 
jpackard56 said:
Does anybody have or know where can I find the gear combinations for a Seneca Falls 9 x 4ft (Star #20 I think)?
The last patent date of six showing is Nov 14 16. The number on the way is # *916801
It does not have any threading plate or chart on it (if it ever did)
The gears I have are 3/4 bore keyed and 9/16 wide. Very good chance I don't have the correct ones to do a 12-thread per inch.
That will be my search after I find the correct combination.... Thanks,
Jim
Click to expand...
Might want to check with @projectnut
here's his post from back in '16.
www.hobby-machinist.com

Seneca Falls Star #20 Lathe

Let me be the first to offer some pictures of a Seneca Falls Lathe. This one has been "in the family" for many years. It's a 1916 Star #20 model that was originally operated by my wife's grandfather. He worked in the R&D department at a local company that made vending machines. Since the...
www.hobby-machinist.com www.hobby-machinist.com
 
Here's a link to the Seneca Falls publications on the Vintage Machinery website:

I know at least catalog 27 has a list of the change gears for a #20 on page 41. According to my threading chart it takes 4 gears to cut 12 threads per inch.

The top gear (stud) is 48 teeth

The intermediate shaft (Inter) has 2 gears. The outer gear has 60 teeth, and the inner gear has 40 teeth

The lead screw gear (screw) has 32 teeth

The words in parenthesis are the labels on the brass chart at the bottom of the headstock.
 
Talk about fast results !
Thanks guys, now I've got some good info. to noodle with.
 
You must log in or register to reply here.
Back
Top