Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Largest Manufacturing Technology Community on the Web
Stay Connected:
Why is there a second thread chart on this I/M 10EE, mentioning 24T reverse gear?
- Thread starter TheOldCar
- Start date
- Replies 23
- Views 4,238
Steve in SoCal
Titanium
- Joined
- Oct 17, 2006
Extra fine thread pitch, imagine threading a part with 228 TPI Most likely, more common metric pitches not available with standard gearing.
Steve
Steve
Thanks Steve! Is this something Monarch offered? Does it imply swapping or flipping a change gear manually, like an uber fine pitch option on the already inch/metric gearbox? I've never seen this option.
Could this be actual different gearing than the standard I/M gearbox? I keep wondering if there is an extra detent on one of the levers...
Could this be actual different gearing than the standard I/M gearbox? I keep wondering if there is an extra detent on one of the levers...
donie
Diamond
- Joined
- May 17, 2003
- Location
- Walla Walla Wine and Wild Turkey
This is the first time I have seen a chart for the 24T gear. Monarch states the gear allows "all" metric threads to be cut. I have never needed to use it, but it certainly extends the range of fractional inch threads also.
There is only one common metric thread the machine will not cut without the 24T gear, it is a fine thread, I cant remember for sure seems like .7 mm.
There is only one common metric thread the machine will not cut without the 24T gear, it is a fine thread, I cant remember for sure seems like .7 mm.
I must be stupid this morning, looking at that thread chart plate things aren't adding up. Clearly it says "top row-threads per inch" and "bottom row-pitch in millimeters". Pretty simple statements in both those. And clearly it states the threads per inch are getting finer moving from top left to bottom right, finer being more threads per inch. They actually double (tpi) going down in each column, getting finer with each step. Not so with the millimeter values, the values are actually doubling. Or said another way, by doubling they're getting coarser. That seems odd. Then too, the threads per inch continues the doubling of threads per inch all the way down each column. The metric values break that trend starting with the "B" row. No seeming correlation between the values above in rows "A". I'm a round dial user, so the threading on a square dial is something I've not ever dealt with. But it seems the values in millimeters out to correlate to the pitch of the threads per inch value. I don't see any that do that. There must be some transposing being done that's not mentioned in that chart when wanting to cut metric threads. And if it's on an I/M SD 10EE, that makes sense. Maybe if I had an I/M SD 10EE it would all make perfect sense. But reading the tpi values, the feed is being slowed down with each change starting at the top left. But the metric values say it's speeding up. That's the part that's not making sense to me. Or am I totally fucked up there?
Oh well, Regards
Bob
Oh well, Regards
Bob
Keep this coming!
I feel so dumb asking this: That means the 24T thread is a spare change gear?
Here is the only other picture I have that shows the gearbox & feed/thread plates together. I can't tell if anything is different than a standard I/M gearbox???
[/url]7579CCCB-AD9F-4621-9440-E1F28B2F18A2 by crh2765, on Flickr[/IMG]
Hey OldCar, hope you don't mind me elbowing in on your thread
Anybody here (donie?) know where the "correct" place is to mount the metal metric change gears plate/chart on an "Inch only" 10EE?
Same location as the auxiliary metric plate currently under discussion?
Anybody here (donie?) know where the "correct" place is to mount the metal metric change gears plate/chart on an "Inch only" 10EE?
Same location as the auxiliary metric plate currently under discussion?
Steve in SoCal
Titanium
- Joined
- Oct 17, 2006
The chart and the gear noted on this chart are the REVERSE gear, not the gears supplied with either the metric transposition set or a standard I/M gear box. The reverse gear is the gear that changes the feed/threading from left to right. I looked at the drawing for my 10EE and there is no mention of optional gear configurations for the reverse gear. At least on a 1976 I/M machine, my lathe has drawing for all the supplied accessories furnished with the machine. Perhaps calling Monarch with the serial number of the machine in question will answer the question.
Steve
Steve
The difference is metric is given as millimeters per thread where the inch table is given as threads per inch. One measurement method is the inverse of the other.
I see them more often than not on the lower side cover, as if there to view when changing the gears. No idea if its where Monarch would put them, though. I just keep mine in a drawer with the change gears.
Steve, I'll take your advise and call Monarch on Monday.
Donie; great info from your posts in this thread. looks like it was an option!
0.7mm not an option for metric pitch on 10EE?
So does an I/M gearbox have access to "change gears" like the inch gearboxes do? Remove cover plate and there it is? I never paid enough attention to the stand-alone I/M gearbox I had...
One more thing, Donie: I need to send you a PM but your box is STILL full. Don't be giving me the cold shoulder! (Just need your opinion on a 10EE "part")
0.7mm not an option for metric pitch on 10EE?
So does an I/M gearbox have access to "change gears" like the inch gearboxes do? Remove cover plate and there it is? I never paid enough attention to the stand-alone I/M gearbox I had...
One more thing, Donie: I need to send you a PM but your box is STILL full. Don't be giving me the cold shoulder! (Just need your opinion on a 10EE "part")
old_dave
Stainless
- Joined
- Apr 15, 2002
- Location
- Central Mother Lode, California
That's where it's located on my 1977 10EE, on the lower end cover (head stock end) to the right of the vertical trim pieces. My copy of the original invoice shows metric transposing gears were included when this machine was shipped to the Electro-Mechanical Division of Northrop Corp. in May 1977 so I have a hunch Monarch mounted the plate.
Unfortunately while I got the plate, I didn't get the change gears, I was able to get a set off eBay back in 2002 shortly after getting the 10EE.
David
The standard gear on the reverse shaft is a 26 tooth 16 DP gear. Don't know if it is the same on the I/M machine. I have not run numbers, but since recent posts have pointed out that the standard metric pitches leave a few out, it looks like Monarch offered a 24 tooth gear as well as the installed gear to produce a different range of threads. the installed gear is easy to figure out. Multiply a particular pitch on the 24 tooth chart by x/24=(the equivalent pitch on the standard chart). X is the standard gear.
donie
Diamond
- Joined
- May 17, 2003
- Location
- Walla Walla Wine and Wild Turkey
"
The 24T gears replaces the reverse gear on the end train, "I Think", have to remove the inner cover, One of my I/M machines came with 3 other gears, and a printout related to cutting decimal leads.
Needing extra gears to cut expanded thread or lead ranges is common to every lathe. The Hardinge needs extra gears to cut 10tpi.
...
Last edited by a moderator:
Excellent info! I just assumed an I/M could do no more!
Donie- send me an email. I was just going to see if you were interested in some free crap for a manufacturer's 10EE. Not much is left except the headstock, main casting and the MG drive. Headstock feels nice (not that "feel" means anything) and is free if you want it. There is not much else; I got cheap for the spare MG set. Not saying you need anything, just remembered you're experienced with that model as well as your others.
Last edited by a moderator:
