I have a sb 9" R junior standard gear change lathe 1937 model. My thread plate does not show idler gear changes just the stud and screw gear numbers? I have the gear change set. The current screw gear is marked 9-42-J and the idler gear marked 9-36-J. None of those numbers are on my thread card? I do not have any pics of how this is supposed to work? Anyone have a pic of the gear change's? Please see pics below.
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Thread gear info on a sb 9" junior standard lathe
- Thread starter svmade
- Start date
- Replies 12
- Views 2,681
iwananew10K
Diamond
- Joined
- Sep 12, 2010
- Location
- moscow,ohio
you are set up for a fine FEED rate....the chart is only concerning threads.
you are fortunate to have gears for fine feed.
good looking Jr.
you are fortunate to have gears for fine feed.
good looking Jr.
johnoder
Diamond
- Joined
- Jul 16, 2004
- Location
- Houston, TX USA
Follow the reverse handle down - its pointed at stud gear
Big gear most to right and down is screw gear
Currently you are COMPOUNDED for fine feed
This involves two planes of gears
Threading set ups on your lathe involve a single plane of gears
For this purpose there are SPACERS so you can adjust a gear's position from one plane to the adjacent plane
Take all off that is on there - stud gear down to screw gear.
Put on and position the stud and screw gears (listed on your chart) to cut the thread you want. Use the spacers so these two gears share the same plane
Put in a BIG GEAR - also in same plane - to act as an idler and connect (mesh with) the stud to the screw gear - its tooth count is of no consequence as long as it does its "connecting" job
You are now set up to cut threads
You may benefit from this great 1927 pub - a good page to address this subject is PDF 92
http://vintagemachinery.org/pubs/1617/5795.pdf
Big gear most to right and down is screw gear
Currently you are COMPOUNDED for fine feed
This involves two planes of gears
Threading set ups on your lathe involve a single plane of gears
For this purpose there are SPACERS so you can adjust a gear's position from one plane to the adjacent plane
Take all off that is on there - stud gear down to screw gear.
Put on and position the stud and screw gears (listed on your chart) to cut the thread you want. Use the spacers so these two gears share the same plane
Put in a BIG GEAR - also in same plane - to act as an idler and connect (mesh with) the stud to the screw gear - its tooth count is of no consequence as long as it does its "connecting" job
You are now set up to cut threads
You may benefit from this great 1927 pub - a good page to address this subject is PDF 92
http://vintagemachinery.org/pubs/1617/5795.pdf
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Last edited:
Thank you for the reply and I see now as I was wondering about the undocumented large gears. It does run nice and fine when feeding. I copied your instructions for when I do some threading.
Dobermann
Hot Rolled
- Joined
- Jan 2, 2014
- Location
- North Carolina
That's a really nice looking 9 Jr. I have one and it's a good solid lathe.
Do yourself and your lathe a favor: Take all the gears you have and clean them to remove any dirt and stray chips from them. Lubricate them ONLY with regular oil of the type you use for the lathe bed---or even engine oil if you prefer. Do not use grease on the gears because it attracts and holds dirt and metal chips which are not good for gears.
Do yourself and your lathe a favor: Take all the gears you have and clean them to remove any dirt and stray chips from them. Lubricate them ONLY with regular oil of the type you use for the lathe bed---or even engine oil if you prefer. Do not use grease on the gears because it attracts and holds dirt and metal chips which are not good for gears.
Thread dial indicator?
Just a question on threading for you. My junior does not have a thread dial nor any spot to put one. Has anyone ever installed one on my lathe? Wondering if I was to drill and tap a location for the bolt and get a new indicator like I have seen on ebay. Pics show my location.
Just a question on threading for you. My junior does not have a thread dial nor any spot to put one. Has anyone ever installed one on my lathe? Wondering if I was to drill and tap a location for the bolt and get a new indicator like I have seen on ebay. Pics show my location.
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johnoder
Diamond
- Joined
- Jul 16, 2004
- Location
- Houston, TX USA
Certainly - could be the pad for when the stop is used that end - could be braced off a wiper screw if thought necessary. Thread dials are about the least hard working lathe parts I can think of
I think so also. Looking at a cheaper 3D printed dial with a simple pin that goes into a hole and the dial has location for a locking screw. Just swing it back off the lead screw when not needed. Small hole to press or glue the pin. Only problem is I have a lead screw that is .75 x 8t and have asked the seller if it would still work. They say works for 9" c, a an others. but want to make sure for $50.
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iwananew10K
Diamond
- Joined
- Sep 12, 2010
- Location
- moscow,ohio
no, you want the dial for a "heavy 10"
I guess you could use the 9,10k dial as the leadscrew a are the same, but much better with heavy 10 dial for fit up.
Here are the installation instructions- you can omit the 3/16 pin if you like.
http://www.wswells.com/data/howto/paula_stephens/thread_dial_10-16.pdf
I guess you could use the 9,10k dial as the leadscrew a are the same, but much better with heavy 10 dial for fit up.
Here are the installation instructions- you can omit the 3/16 pin if you like.
http://www.wswells.com/data/howto/paula_stephens/thread_dial_10-16.pdf
kitno455
Titanium
- Joined
- Jul 9, 2010
- Location
- Virginia, USA
I put a small disc of felt in mine, to slow the rate oil leaves the oiler.
allan
allan
Hey good Idea. Not sure what the spring deal is for but I think the felt plug is a good idea. I wonder however if the junior was designed to not have any restriction? Maybe some one out there could tell us if the felt wick system was used on the 1937 9" R Junior?
