Thread cutting

[collector]

My EE is a inch metric has two tread charts I what to cut a .7 mm thread the chart with that pitch says 24T reverse shaft gear . OK were is the 24 T reverse shaft gear to make that chart work ?

Thanks Guys Collector

[donie]

Most likely should be referred to as the stud gear, though Monarch calls it the reverse gear.
Its the upper gear on the train at the rear of the headstock under the cover.

[donie]

oops double post, anyway so far I never had to cut that one, Monarch says, any metric thread "with in range of the box" can be cut by changing gears. Maybe so.

[collector]

Donie I took the end cover of and I can see where the gear gets changed you would think Monarch would have a place for the spare gear or is that and extra part that you would need to buy what a PITA. the only metric thread that I need to do and the machine cant do it .Oh well 36 tpi will have to do . Do any of you guys have the 24 t gear for sale.

Thanks Colllector

[peterh5322]

The I/m feature can cut many more pitches than are customary or model-makers pitches.

The same with the metric conversion kit, where only a few box positions are usable in that specific respect.

This kit is designed for the square dial machines and consists of a 60/127 transposer and reverse shaft gears with 45, 50, 55, 60, 65, 70, 75 and 80 teeth.

For round dial machines, a 127 teeth gear is included, as it must be, but it is compounded with two different gears. The details escape me at the moment, but 72 teeth seems to ring a bell, and possibly one other.

The round dial end gear unit is quite flexible, unlike the square dial end gear unit which has but one quadrant. The round dial has two quadrants, enhancing its flexibility.

For a case where one requires only one metric pitch, it is possible to substitute an off-the-shelf Boston Gear Works 16 D.P. change gear and to get a very close approximation.

Dave (Rimcanyon) has done a lot of work on round dial metric threading. Search the archives for his most interesting posts.

For the square dial, a 63 teeth transposer gives a lot of metric pitches with reasonable accuracy.

[rimcanyon]

collector, how many teeth does the stud gear have currently, on your machine?

I assume the stud gear is 16dp; if so, you can purchase a 24 tooth gear from Boston Gear (after verifying that the bore and the keyway are the right sizes).

As Peter mentions, I bought a couple of gears from Boston Gear to cut metric threads on my 1940 round dial. they fit just like the originals, incl. keyway.

-Dave

[collector]

It has a 30 teeth on the gear . Thanks I will see if I can get one from Boston gear.

[Wildcattle]

My EE is a inch metric has two tread charts I what to cut a .7 mm thread the chart with that pitch says 24T reverse shaft gear . OK were is the 24 T reverse shaft gear to make that chart work ?

What chart are you referring to? I do not have one in my manual...

It is kind of puzzling that 2 very common threads are not on the I/M gear box: 0.7mm (M4) and 0.8mm (M5).
One way to do this is to use a 21 tooth gear to replace the 30T end gear and set the box for 1.0mm. The 24 tooth will do for the 0.8mm.
I don't know if the quadrant can acomodate those teeth count but I believe so. If not a 28 would generate 0.7mm if the box is set for 0.75mm.
After further investigation, it turns out that the 24T can actually be used to generate the following:
Desired Set position
0.3 0.375 1BD
0.4 0.5 7BD
0.5 0.625 8BD !
0.6 0.75 1BE
0.7 0.875 4BE
0.8 1 7BE
0.9 1.125 6BE
1.0 1.25 8BE

So I guess that a 24T is the ticket.

WC-

[donie]

I have seen at least one I/M EE with a second chart mounted just below the regular chart. As I remember it gave alternate threads available by changing the reverse or stud gear.
It appears the I/M Hardinge HLVH cuts the .7mm thread with regular gearing, but requires end gear changes for some other metric and inch threads also.
Another excuse for me to pick up a Hardinge!

[rimcanyon]

It appears the I/M Hardinge HLVH cuts the .7mm thread with regular gearing, but requires end gear changes for some other metric and inch threads also.
Another excuse for me to pick up a Hardinge!

Donie, Donie, Donie. No, time to buy another I/M with a 24 tooth gear. Come on, what were you thinking?

-Dave

[Toms Wheels]

Doesn't Donie have 7 10EE's in his 401K plan?

[collector]

Got a price from Monarch for the 24 tooth gear $ 842.00 dollars 4 week delivery. so I will go for the Browning / Boston gear for 21.00 dollars.