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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.
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
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?
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")
"
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.
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