Thread: CVA metric Changewheels

Just some photos of the metric changewheel setup on my CVA, to help out an Ozzie who asked
Overview of the metric wheels:



They use smaller teeth than the imperial ones, so the 127 translation gear is manageable in size.

The changewheel chart from my machine:



The 127 compound gear is used with either 48 or 72 teeth. They are keyed together. Here assembled:



And Split:



And heres a couple of changewheels so you can see the boss on them:



Any other photo requests just ask.

Dave

That appears to be similar to the Monarch metric change gear set for round dial. These are some pictures I grabbed a few years ago when one was forsale on ebay.

Thanks Guys. It's all interesting stuff to see, especially the split photo as there seem to be a multitude of ways of keying those gears together.

Michael

The end gear unit of the square dials is enclosed and cannot accommodate a quadrant gear larger than 4.03 inches or a reverse shaft gear larger than 2.56 inches.

So, for metric threading on an Imperial 10EE, a switch is made from 16 DP to 32 DP for the reverse shaft gear and the 127 teeth gear.

The remaining gears are 16 DP.

For some of custom conversions, Monarch employs reverse shaft gears and its mating gear with DPs between 16 and 32, to maintain the largest possible gear which fits within the enclosure.

32 would appear to be the smallest DP for use in a machine of the general class of a 10EE.

The round dials have two quadrants, whereas the square dials have only one, and the round dials are quite flexible, certainly more so than the square dials.

Very nice pictures. Thanks

Must get round to making the blanks one day for a set

Charles